http://www.mongodb.org: The MongoDB Java Driver uber-artifact, containing the legacy driver, the mongodb-driver, mongodb-driver-core, and bson
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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mongodb.operation;

import com.mongodb.CursorType;
import com.mongodb.ExplainVerbosity;
import com.mongodb.MongoCommandException;
import com.mongodb.MongoInternalException;
import com.mongodb.MongoNamespace;
import com.mongodb.MongoQueryException;
import com.mongodb.ReadPreference;
import com.mongodb.ServerAddress;
import com.mongodb.async.AsyncBatchCursor;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.binding.AsyncConnectionSource;
import com.mongodb.binding.AsyncReadBinding;
import com.mongodb.binding.AsyncSingleConnectionReadBinding;
import com.mongodb.binding.ConnectionSource;
import com.mongodb.binding.ReadBinding;
import com.mongodb.binding.SingleConnectionReadBinding;
import com.mongodb.client.model.Collation;
import com.mongodb.connection.AsyncConnection;
import com.mongodb.connection.Connection;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.connection.QueryResult;
import com.mongodb.connection.ServerDescription;
import com.mongodb.operation.OperationHelper.CallableWithConnectionAndSource;
import com.mongodb.operation.OperationHelper.CallableWithSource;
import com.mongodb.session.SessionContext;
import org.bson.BsonBoolean;
import org.bson.BsonDocument;
import org.bson.BsonDocumentReader;
import org.bson.BsonInt32;
import org.bson.BsonInt64;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.codecs.BsonDocumentCodec;
import org.bson.codecs.Decoder;
import org.bson.codecs.DecoderContext;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.mongodb.ReadPreference.primary;
import static com.mongodb.assertions.Assertions.isTrueArgument;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.connection.ServerType.SHARD_ROUTER;
import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;
import static com.mongodb.internal.operation.ServerVersionHelper.serverIsAtLeastVersionThreeDotTwo;
import static com.mongodb.operation.CommandOperationHelper.CommandCreator;
import static com.mongodb.operation.CommandOperationHelper.CommandReadTransformer;
import static com.mongodb.operation.CommandOperationHelper.CommandReadTransformerAsync;
import static com.mongodb.operation.CommandOperationHelper.executeCommandWithConnection;
import static com.mongodb.operation.CommandOperationHelper.executeCommandAsyncWithConnection;
import static com.mongodb.operation.DocumentHelper.putIfNotNullOrEmpty;
import static com.mongodb.operation.OperationHelper.AsyncCallableWithConnectionAndSource;
import static com.mongodb.operation.OperationHelper.LOGGER;
import static com.mongodb.operation.OperationHelper.cursorDocumentToQueryResult;
import static com.mongodb.operation.OperationHelper.releasingCallback;
import static com.mongodb.operation.OperationHelper.validateReadConcernAndCollation;
import static com.mongodb.operation.OperationHelper.withConnection;
import static com.mongodb.operation.OperationHelper.withAsyncReadConnection;
import static com.mongodb.operation.OperationHelper.withReadConnectionSource;
import static com.mongodb.operation.OperationReadConcernHelper.appendReadConcernToCommand;


An operation that queries a collection using the provided criteria.

Type parameters:
  • <T> – the operations result type.
Since:3.0
/**
 * An operation that queries a collection using the provided criteria.
 *
 * @param <T> the operations result type.
 * @since 3.0
 */
@Deprecated
public class FindOperation<T> implements AsyncReadOperation<AsyncBatchCursor<T>>, ReadOperation<BatchCursor<T>> {
    private static final String FIRST_BATCH = "firstBatch";

    private final MongoNamespace namespace;
    private final Decoder<T> decoder;
    private boolean retryReads;
    private BsonDocument filter;
    private int batchSize;
    private int limit;
    private BsonDocument modifiers;
    private BsonDocument projection;
    private long maxTimeMS;
    private long maxAwaitTimeMS;
    private int skip;
    private BsonDocument sort;
    private CursorType cursorType = CursorType.NonTailable;
    private boolean slaveOk;
    private boolean oplogReplay;
    private boolean noCursorTimeout;
    private boolean partial;
    private Collation collation;
    private String comment;
    private BsonValue hint;
    private BsonDocument max;
    private BsonDocument min;
    private long maxScan;
    private boolean returnKey;
    private boolean showRecordId;
    private boolean snapshot;

    
Construct a new instance.

Params:
  • namespace – the database and collection namespace for the operation.
  • decoder – the decoder for the result documents.
/**
     * Construct a new instance.
     *
     * @param namespace the database and collection namespace for the operation.
     * @param decoder the decoder for the result documents.
     */
    public FindOperation(final MongoNamespace namespace, final Decoder<T> decoder) {
        this.namespace = notNull("namespace", namespace);
        this.decoder = notNull("decoder", decoder);
    }

    
Gets the namespace.

Returns:the namespace
/**
     * Gets the namespace.
     *
     * @return the namespace
     */
    public MongoNamespace getNamespace() {
        return namespace;
    }

    
Gets the decoder used to decode the result documents.

Returns:the decoder
/**
     * Gets the decoder used to decode the result documents.
     *
     * @return the decoder
     */
    public Decoder<T> getDecoder() {
        return decoder;
    }

    
Gets the query filter.

Returns:the query filter
@mongodb.driver.manualreference/method/db.collection.find/ Filter
/**
     * Gets the query filter.
     *
     * @return the query filter
     * @mongodb.driver.manual reference/method/db.collection.find/ Filter
     */
    public BsonDocument getFilter() {
        return filter;
    }

    
Sets the query filter to apply to the query.

Params:
  • filter – the filter, which may be null.
Returns:this
@mongodb.driver.manualreference/method/db.collection.find/ Filter
/**
     * Sets the query filter to apply to the query.
     *
     * @param filter the filter, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/db.collection.find/ Filter
     */
    public FindOperation<T> filter(final BsonDocument filter) {
        this.filter = filter;
        return this;
    }

    
Gets the number of documents to return per batch.  Default to 0, which indicates that the server chooses an appropriate batch size.

Returns:the batch size, which may be null
@mongodb.driver.manualreference/method/cursor.batchSize/#cursor.batchSize Batch Size
/**
     * Gets the number of documents to return per batch.  Default to 0, which indicates that the server chooses an appropriate batch size.
     *
     * @return the batch size, which may be null
     * @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
     */
    public int getBatchSize() {
        return batchSize;
    }

    
Sets the number of documents to return per batch.

Params:
  • batchSize – the batch size
Returns:this
@mongodb.driver.manualreference/method/cursor.batchSize/#cursor.batchSize Batch Size
/**
     * Sets the number of documents to return per batch.
     *
     * @param batchSize the batch size
     * @return this
     * @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
     */
    public FindOperation<T> batchSize(final int batchSize) {
        this.batchSize = batchSize;
        return this;
    }

    
Gets the limit to apply.  The default is null.

Returns:the limit
@mongodb.driver.manualreference/method/cursor.limit/#cursor.limit Limit
/**
     * Gets the limit to apply.  The default is null.
     *
     * @return the limit
     * @mongodb.driver.manual reference/method/cursor.limit/#cursor.limit Limit
     */
    public int getLimit() {
        return limit;
    }

    
Sets the limit to apply.

Params:
  • limit – the limit, which may be null
Returns:this
@mongodb.driver.manualreference/method/cursor.limit/#cursor.limit Limit
/**
     * Sets the limit to apply.
     *
     * @param limit the limit, which may be null
     * @return this
     * @mongodb.driver.manual reference/method/cursor.limit/#cursor.limit Limit
     */
    public FindOperation<T> limit(final int limit) {
        this.limit = limit;
        return this;
    }

    
Gets the query modifiers to apply to this operation.  The default is not to apply any modifiers.

Returns:the query modifiers, which may be null
@mongodb.driver.manualreference/operator/query-modifier/ Query Modifiers
/**
     * Gets the query modifiers to apply to this operation.  The default is not to apply any modifiers.
     *
     * @return the query modifiers, which may be null
     * @mongodb.driver.manual reference/operator/query-modifier/ Query Modifiers
     */
    public BsonDocument getModifiers() {
        return modifiers;
    }

    
Sets the query modifiers to apply to this operation.

Params:
  • modifiers – the query modifiers to apply, which may be null.
Returns:this
@mongodb.driver.manualreference/operator/query-modifier/ Query Modifiers
Deprecated:use the individual setters instead
/**
     * Sets the query modifiers to apply to this operation.
     *
     * @param modifiers the query modifiers to apply, which may be null.
     * @return this
     * @mongodb.driver.manual reference/operator/query-modifier/ Query Modifiers
     * @deprecated use the individual setters instead
     */
    @Deprecated
    public FindOperation<T> modifiers(final BsonDocument modifiers) {
        this.modifiers = modifiers;
        return this;
    }

    
Gets a document describing the fields to return for all matching documents.

Returns:the project document, which may be null
@mongodb.driver.manualreference/method/db.collection.find/ Projection
/**
     * Gets a document describing the fields to return for all matching documents.
     *
     * @return the project document, which may be null
     * @mongodb.driver.manual reference/method/db.collection.find/ Projection
     */
    public BsonDocument getProjection() {
        return projection;
    }

    
Sets a document describing the fields to return for all matching documents.

Params:
  • projection – the project document, which may be null.
Returns:this
@mongodb.driver.manualreference/method/db.collection.find/ Projection
/**
     * Sets a document describing the fields to return for all matching documents.
     *
     * @param projection the project document, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/db.collection.find/ Projection
     */
    public FindOperation<T> projection(final BsonDocument projection) {
        this.projection = projection;
        return this;
    }

    
Gets the maximum execution time on the server for this operation.  The default is 0, which places no limit on the execution time.

Params:
  • timeUnit – the time unit to return the result in
Returns:the maximum execution time in the given time unit
/**
     * Gets the maximum execution time on the server for this operation.  The default is 0, which places no limit on the execution time.
     *
     * @param timeUnit the time unit to return the result in
     * @return the maximum execution time in the given time unit
     */
    public long getMaxTime(final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        return timeUnit.convert(maxTimeMS, TimeUnit.MILLISECONDS);
    }

    
Sets the maximum execution time on the server for this operation.

Params:
  • maxTime –  the max time
  • timeUnit – the time unit, which may not be null
Returns:this
/**
     * Sets the maximum execution time on the server for this operation.
     *
     * @param maxTime  the max time
     * @param timeUnit the time unit, which may not be null
     * @return this
     */
    public FindOperation<T> maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        isTrueArgument("maxTime >= 0", maxTime >= 0);
        this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

    
The maximum amount of time for the server to wait on new documents to satisfy a tailable cursor
query. This only applies to a TAILABLE_AWAIT cursor. When the cursor is not a TAILABLE_AWAIT cursor,
this option is ignored.
On servers >= 3.2, this option will be specified on the getMore command as "maxTimeMS". The default
is no value: no "maxTimeMS" is sent to the server with the getMore command.
On servers < 3.2, this option is ignored, and indicates that the driver should respect the server's default value
A zero value will be ignored.

Params:
  • timeUnit – the time unit to return the result in
Returns:the maximum await execution time in the given time unit
Since:3.2
@mongodb.driver.manualreference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
/**
     * The maximum amount of time for the server to wait on new documents to satisfy a tailable cursor
     * query. This only applies to a TAILABLE_AWAIT cursor. When the cursor is not a TAILABLE_AWAIT cursor,
     * this option is ignored.
     *
     * On servers &gt;= 3.2, this option will be specified on the getMore command as "maxTimeMS". The default
     * is no value: no "maxTimeMS" is sent to the server with the getMore command.
     *
     * On servers &lt; 3.2, this option is ignored, and indicates that the driver should respect the server's default value
     *
     * A zero value will be ignored.
     *
     * @param timeUnit the time unit to return the result in
     * @return the maximum await execution time in the given time unit
     * @since 3.2
     * @mongodb.driver.manual reference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
     */
    public long getMaxAwaitTime(final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        return timeUnit.convert(maxAwaitTimeMS, TimeUnit.MILLISECONDS);
    }

    
Sets the maximum await execution time on the server for this operation.

Params:
  • maxAwaitTime –  the max await time.  A zero value will be ignored, and indicates that the driver should respect the server's
                     default value
  • timeUnit – the time unit, which may not be null
Returns:this
Since:3.2
@mongodb.driver.manualreference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
/**
     * Sets the maximum await execution time on the server for this operation.
     *
     * @param maxAwaitTime  the max await time.  A zero value will be ignored, and indicates that the driver should respect the server's
     *                      default value
     * @param timeUnit the time unit, which may not be null
     * @return this
     * @since 3.2
     * @mongodb.driver.manual reference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
     */
    public FindOperation<T> maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        isTrueArgument("maxAwaitTime >= 0", maxAwaitTime >= 0);
        this.maxAwaitTimeMS = TimeUnit.MILLISECONDS.convert(maxAwaitTime, timeUnit);
        return this;
    }
    
Gets the number of documents to skip.  The default is 0.

Returns:the number of documents to skip, which may be null
@mongodb.driver.manualreference/method/cursor.skip/#cursor.skip Skip
/**
     * Gets the number of documents to skip.  The default is 0.
     *
     * @return the number of documents to skip, which may be null
     * @mongodb.driver.manual reference/method/cursor.skip/#cursor.skip Skip
     */
    public int getSkip() {
        return skip;
    }

    
Sets the number of documents to skip.

Params:
  • skip – the number of documents to skip
Returns:this
@mongodb.driver.manualreference/method/cursor.skip/#cursor.skip Skip
/**
     * Sets the number of documents to skip.
     *
     * @param skip the number of documents to skip
     * @return this
     * @mongodb.driver.manual reference/method/cursor.skip/#cursor.skip Skip
     */
    public FindOperation<T> skip(final int skip) {
        this.skip = skip;
        return this;
    }

    
Gets the sort criteria to apply to the query. The default is null, which means that the documents will be returned in an undefined
order.

Returns:a document describing the sort criteria
@mongodb.driver.manualreference/method/cursor.sort/ Sort
/**
     * Gets the sort criteria to apply to the query. The default is null, which means that the documents will be returned in an undefined
     * order.
     *
     * @return a document describing the sort criteria
     * @mongodb.driver.manual reference/method/cursor.sort/ Sort
     */
    public BsonDocument getSort() {
        return sort;
    }

    
Sets the sort criteria to apply to the query.

Params:
  • sort – the sort criteria, which may be null.
Returns:this
@mongodb.driver.manualreference/method/cursor.sort/ Sort
/**
     * Sets the sort criteria to apply to the query.
     *
     * @param sort the sort criteria, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/cursor.sort/ Sort
     */
    public FindOperation<T> sort(final BsonDocument sort) {
        this.sort = sort;
        return this;
    }

    
Get the cursor type.

Returns:the cursor type
/**
     * Get the cursor type.
     *
     * @return the cursor type
     */
    public CursorType getCursorType() {
        return cursorType;
    }

    
Sets the cursor type.

Params:
  • cursorType – the cursor type
Returns:this
/**
     * Sets the cursor type.
     *
     * @param cursorType the cursor type
     * @return this
     */
    public FindOperation<T> cursorType(final CursorType cursorType) {
        this.cursorType = notNull("cursorType", cursorType);
        return this;
    }

    
Returns true if set to allowed to query non-primary replica set members.

Returns:true if set to allowed to query non-primary replica set members.
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Returns true if set to allowed to query non-primary replica set members.
     *
     * @return true if set to allowed to query non-primary replica set members.
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public boolean isSlaveOk() {
        return slaveOk;
    }

    
Sets if allowed to query non-primary replica set members.

Params:
  • slaveOk – true if allowed to query non-primary replica set members.
Returns:this
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Sets if allowed to query non-primary replica set members.
     *
     * @param slaveOk true if allowed to query non-primary replica set members.
     * @return this
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public FindOperation<T> slaveOk(final boolean slaveOk) {
        this.slaveOk = slaveOk;
        return this;
    }

    
Internal replication use only.  Driver users should ordinarily not use this.

Returns:oplogReplay
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Internal replication use only.  Driver users should ordinarily not use this.
     *
     * @return oplogReplay
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public boolean isOplogReplay() {
        return oplogReplay;
    }

    
Internal replication use only.  Driver users should ordinarily not use this.

Params:
  • oplogReplay – the oplogReplay value
Returns:this
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Internal replication use only.  Driver users should ordinarily not use this.
     *
     * @param oplogReplay the oplogReplay value
     * @return this
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public FindOperation<T> oplogReplay(final boolean oplogReplay) {
        this.oplogReplay = oplogReplay;
        return this;
    }

    
Returns true if cursor timeout has been turned off.

The server normally times out idle cursors after an inactivity period (10 minutes) to prevent excess memory use.


Returns:if cursor timeout has been turned off
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Returns true if cursor timeout has been turned off.
     *
     * <p>The server normally times out idle cursors after an inactivity period (10 minutes) to prevent excess memory use.</p>
     *
     * @return if cursor timeout has been turned off
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public boolean isNoCursorTimeout() {
        return noCursorTimeout;
    }

    
Sets if the cursor timeout should be turned off.

Params:
  • noCursorTimeout – true if the cursor timeout should be turned off.
Returns:this
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Sets if the cursor timeout should be turned off.
     *
     * @param noCursorTimeout true if the cursor timeout should be turned off.
     * @return this
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public FindOperation<T> noCursorTimeout(final boolean noCursorTimeout) {
        this.noCursorTimeout = noCursorTimeout;
        return this;
    }

    
Returns true if can get partial results from a mongos if some shards are down.

Returns:if can get partial results from a mongos if some shards are down
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Returns true if can get partial results from a mongos if some shards are down.
     *
     * @return if can get partial results from a mongos if some shards are down
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public boolean isPartial() {
        return partial;
    }

    
Sets if partial results from a mongos if some shards are down are allowed

Params:
  • partial – allow partial results from a mongos if some shards are down
Returns:this
@mongodb.driver.manual../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
/**
     * Sets if partial results from a mongos if some shards are down are allowed
     *
     * @param partial allow partial results from a mongos if some shards are down
     * @return this
     * @mongodb.driver.manual ../meta-driver/latest/legacy/mongodb-wire-protocol/#op-query OP_QUERY
     */
    public FindOperation<T> partial(final boolean partial) {
        this.partial = partial;
        return this;
    }

    
Returns the collation options

Returns:the collation options
Since:3.4
@mongodb.server.release3.4
/**
     * Returns the collation options
     *
     * @return the collation options
     * @since 3.4
     * @mongodb.server.release 3.4
     */
    public Collation getCollation() {
        return collation;
    }

    
Sets the collation options

A null value represents the server default.


Params:
  • collation – the collation options to use
Returns:this
Since:3.4
@mongodb.server.release3.4
/**
     * Sets the collation options
     *
     * <p>A null value represents the server default.</p>
     * @param collation the collation options to use
     * @return this
     * @since 3.4
     * @mongodb.server.release 3.4
     */
    public FindOperation<T> collation(final Collation collation) {
        this.collation = collation;
        return this;
    }

    
Returns the comment to send with the query. The default is not to include a comment with the query.

Returns:the comment
Since:3.5
/**
     * Returns the comment to send with the query. The default is not to include a comment with the query.
     *
     * @return the comment
     * @since 3.5
     */
    public String getComment() {
        return comment;
    }

    
Sets the comment to the query. A null value means no comment is set.

Params:
  • comment – the comment
Returns:this
Since:3.5
/**
     * Sets the comment to the query. A null value means no comment is set.
     *
     * @param comment the comment
     * @return this
     * @since 3.5
     */
    public FindOperation<T> comment(final String comment) {
        this.comment = comment;
        return this;
    }

    
Returns the hint for which index to use. The default is not to set a hint.

Returns:the hint
Since:3.5
/**
     * Returns the hint for which index to use. The default is not to set a hint.
     *
     * @return the hint
     * @since 3.5
     */
    public BsonValue getHint() {
        return hint;
    }

    
Sets the hint for which index to use. A null value means no hint is set.

Params:
  • hint – the hint
Returns:this
Since:3.5
/**
     * Sets the hint for which index to use. A null value means no hint is set.
     *
     * @param hint the hint
     * @return this
     * @since 3.5
     */
    public FindOperation<T> hint(final BsonValue hint) {
        this.hint = hint;
        return this;
    }

    
Returns the exclusive upper bound for a specific index. By default there is no max bound.

Returns:the max
Since:3.5
/**
     * Returns the exclusive upper bound for a specific index. By default there is no max bound.
     *
     * @return the max
     * @since 3.5
     */
    public BsonDocument getMax() {
        return max;
    }

    
Sets the exclusive upper bound for a specific index. A null value means no max is set.

Params:
  • max – the max
Returns:this
Since:3.5
/**
     * Sets the exclusive upper bound for a specific index. A null value means no max is set.
     *
     * @param max the max
     * @return this
     * @since 3.5
     */
    public FindOperation<T> max(final BsonDocument max) {
        this.max = max;
        return this;
    }

    
Returns the minimum inclusive lower bound for a specific index. By default there is no min bound.

Returns:the min
Since:3.5
/**
     * Returns the minimum inclusive lower bound for a specific index. By default there is no min bound.
     *
     * @return the min
     * @since 3.5
     */
    public BsonDocument getMin() {
        return min;
    }

    
Sets the minimum inclusive lower bound for a specific index. A null value means no max is set.

Params:
  • min – the min
Returns:this
Since:3.5
/**
     * Sets the minimum inclusive lower bound for a specific index. A null value means no max is set.
     *
     * @param min the min
     * @return this
     * @since 3.5
     */
    public FindOperation<T> min(final BsonDocument min) {
        this.min = min;
        return this;
    }

    
Returns the maximum number of documents or index keys to scan when executing the query.
A zero value or less will be ignored, and indicates that the driver should respect the server's default value.

Returns:the maxScan
Since:3.5
Deprecated:Deprecated as of MongoDB 4.0 release
/**
     * Returns the maximum number of documents or index keys to scan when executing the query.
     *
     * A zero value or less will be ignored, and indicates that the driver should respect the server's default value.
     *
     * @return the maxScan
     * @since 3.5
     * @deprecated Deprecated as of MongoDB 4.0 release
     */
    @Deprecated
    public long getMaxScan() {
        return maxScan;
    }

    
Sets the maximum number of documents or index keys to scan when executing the query.
A zero value or less will be ignored, and indicates that the driver should respect the server's default value.

Params:
  • maxScan – the maxScan
Returns:this
Since:3.5
Deprecated:Deprecated as of MongoDB 4.0 release
/**
     * Sets the maximum number of documents or index keys to scan when executing the query.
     *
     * A zero value or less will be ignored, and indicates that the driver should respect the server's default value.
     *
     * @param maxScan the maxScan
     * @return this
     * @since 3.5
     * @deprecated Deprecated as of MongoDB 4.0 release
     */
    @Deprecated
    public FindOperation<T> maxScan(final long maxScan) {
        this.maxScan = maxScan;
        return this;
    }

    
Returns the returnKey. If true the find operation will return only the index keys in the resulting documents.
Default value is false. If returnKey is true and the find command does not use an index, the returned documents will be empty.

Returns:the returnKey
Since:3.5
/**
     * Returns the returnKey. If true the find operation will return only the index keys in the resulting documents.
     *
     * Default value is false. If returnKey is true and the find command does not use an index, the returned documents will be empty.
     *
     * @return the returnKey
     * @since 3.5
     */
    public boolean isReturnKey() {
        return returnKey;
    }

    
Sets the returnKey. If true the find operation will return only the index keys in the resulting documents.

Params:
  • returnKey – the returnKey
Returns:this
Since:3.5
/**
     * Sets the returnKey. If true the find operation will return only the index keys in the resulting documents.
     *
     * @param returnKey the returnKey
     * @return this
     * @since 3.5
     */
    public FindOperation<T> returnKey(final boolean returnKey) {
        this.returnKey = returnKey;
        return this;
    }

    
Returns the showRecordId.
Determines whether to return the record identifier for each document. If true, adds a field $recordId to the returned documents.
The default is false.

Returns:the showRecordId
Since:3.5
/**
     * Returns the showRecordId.
     *
     * Determines whether to return the record identifier for each document. If true, adds a field $recordId to the returned documents.
     * The default is false.
     *
     * @return the showRecordId
     * @since 3.5
     */
    public boolean isShowRecordId() {
        return showRecordId;
    }

    
Sets the showRecordId. Set to true to add a field $recordId to the returned documents. 
Params:
  • showRecordId – the showRecordId
Returns:this
Since:3.5
/**
     * Sets the showRecordId. Set to true to add a field {@code $recordId} to the returned documents.
     *
     * @param showRecordId the showRecordId
     * @return this
     * @since 3.5
     */
    public FindOperation<T> showRecordId(final boolean showRecordId) {
        this.showRecordId = showRecordId;
        return this;
    }

    
Returns the snapshot.
Prevents the cursor from returning a document more than once because of an intervening write operation. The default is false.

Returns:the snapshot
Since:3.5
Deprecated:Deprecated in MongoDB 3.6 release and removed in MongoDB 4.0 release
/**
     * Returns the snapshot.
     *
     * Prevents the cursor from returning a document more than once because of an intervening write operation. The default is false.
     *
     * @return the snapshot
     * @since 3.5
     * @deprecated Deprecated in MongoDB 3.6 release and removed in MongoDB 4.0 release
     */
    @Deprecated
    public boolean isSnapshot() {
        return snapshot;
    }

    
Sets the snapshot.
If true it prevents the cursor from returning a document more than once because of an intervening write operation.

Params:
  • snapshot – the snapshot
Returns:this
Since:3.5
Deprecated:Deprecated in MongoDB 3.6 release and removed in MongoDB 4.0 release
/**
     * Sets the snapshot.
     *
     * If true it prevents the cursor from returning a document more than once because of an intervening write operation.
     *
     * @param snapshot the snapshot
     * @return this
     * @since 3.5
     * @deprecated Deprecated in MongoDB 3.6 release and removed in MongoDB 4.0 release
     */
    @Deprecated
    public FindOperation<T> snapshot(final boolean snapshot) {
        this.snapshot = snapshot;
        return this;
    }

    
Enables retryable reads if a read fails due to a network error.

Params:
  • retryReads – true if reads should be retried
Returns:this
Since:3.11
/**
     * Enables retryable reads if a read fails due to a network error.
     *
     * @param retryReads true if reads should be retried
     * @return this
     * @since 3.11
     */
    public FindOperation<T> retryReads(final boolean retryReads) {
        this.retryReads = retryReads;
        return this;
    }

    
Gets the value for retryable reads. The default is true.

Returns:the retryable reads value
Since:3.11
/**
     * Gets the value for retryable reads. The default is true.
     *
     * @return the retryable reads value
     * @since 3.11
     */
    public boolean getRetryReads() {
        return retryReads;
    }

    @Override
    public BatchCursor<T> execute(final ReadBinding binding) {
        return withReadConnectionSource(binding, new CallableWithSource<BatchCursor<T>>() {
            @Override
            public BatchCursor<T> call(final ConnectionSource source) {
                Connection connection = source.getConnection();
                if (serverIsAtLeastVersionThreeDotTwo(connection.getDescription())) {
                    try {
                        return executeCommandWithConnection(binding, source, namespace.getDatabaseName(),
                                getCommandCreator(binding.getSessionContext()),
                                CommandResultDocumentCodec.create(decoder, FIRST_BATCH), transformer(), retryReads, connection);
                    } catch (MongoCommandException e) {
                        throw new MongoQueryException(e);
                    }
                } else {
                    try {
                        validateReadConcernAndCollation(connection, binding.getSessionContext().getReadConcern(), collation);
                        QueryResult<T> queryResult = connection.query(namespace,
                                asDocument(connection.getDescription(), binding.getReadPreference()),
                                projection,
                                skip,
                                limit,
                                batchSize,
                                isSlaveOk() || binding.getReadPreference().isSlaveOk(),
                                isTailableCursor(),
                                isAwaitData(),
                                isNoCursorTimeout(),
                                isPartial(),
                                isOplogReplay(),
                                decoder);
                        return new QueryBatchCursor<T>(queryResult, limit, batchSize, getMaxTimeForCursor(), decoder, source, connection);
                    } finally {
                        connection.release();
                    }
                }
            }
        });
    }

    @Override
    public void executeAsync(final AsyncReadBinding binding, final SingleResultCallback<AsyncBatchCursor<T>> callback) {
        withAsyncReadConnection(binding, new AsyncCallableWithConnectionAndSource() {
            @Override
            public void call(final AsyncConnectionSource source, final AsyncConnection connection, final Throwable t) {
                SingleResultCallback<AsyncBatchCursor<T>> errHandlingCallback = errorHandlingCallback(callback, LOGGER);
                if (t != null) {
                    errHandlingCallback.onResult(null, t);
                } else {
                    if (serverIsAtLeastVersionThreeDotTwo(connection.getDescription())) {
                        final SingleResultCallback<AsyncBatchCursor<T>> wrappedCallback =
                                exceptionTransformingCallback(errHandlingCallback);
                        executeCommandAsyncWithConnection(binding, source, namespace.getDatabaseName(),
                                getCommandCreator(binding.getSessionContext()), CommandResultDocumentCodec.create(decoder, FIRST_BATCH),
                                asyncTransformer(), retryReads, connection, wrappedCallback);
                    } else {
                        final SingleResultCallback<AsyncBatchCursor<T>> wrappedCallback =
                                releasingCallback(errHandlingCallback, source, connection);
                        validateReadConcernAndCollation(source, connection, binding.getSessionContext().getReadConcern(), collation,
                                new AsyncCallableWithConnectionAndSource() {
                                    @Override
                                    public void call(final AsyncConnectionSource source, final AsyncConnection connection, final
                                    Throwable t) {
                                        if (t != null) {
                                            wrappedCallback.onResult(null, t);
                                        } else {
                                            connection.queryAsync(namespace, asDocument(connection.getDescription(),
                                                    binding.getReadPreference()), projection, skip, limit, batchSize,
                                                    isSlaveOk() || binding.getReadPreference().isSlaveOk(),
                                                    isTailableCursor(), isAwaitData(), isNoCursorTimeout(), isPartial(), isOplogReplay(),
                                                    decoder, new SingleResultCallback<QueryResult<T>>() {
                                                        @Override
                                                        public void onResult(final QueryResult<T> result, final Throwable t) {
                                                            if (t != null) {
                                                                wrappedCallback.onResult(null, t);
                                                            } else {
                                                                wrappedCallback.onResult(new AsyncQueryBatchCursor<T>(result, limit,
                                                                        batchSize, getMaxTimeForCursor(), decoder, source, connection),
                                                                        null);
                                                            }
                                                        }
                                                    });
                                        }
                                    }
                        });
                    }
                }
            }
        });
    }

    private static <T> SingleResultCallback<T> exceptionTransformingCallback(final SingleResultCallback<T> callback) {
        return new SingleResultCallback<T>() {
            @Override
            public void onResult(final T result, final Throwable t) {
                if (t != null) {
                    if (t instanceof MongoCommandException) {
                        MongoCommandException commandException = (MongoCommandException) t;
                        callback.onResult(result, new MongoQueryException(commandException.getServerAddress(),
                                                                          commandException.getErrorCode(),
                                commandException.getErrorMessage()));
                    } else {
                        callback.onResult(result, t);
                    }
                } else {
                    callback.onResult(result, null);
                }
            }
        };
    }


    
Gets an operation whose execution explains this operation.

Params:
  • explainVerbosity – the explain verbosity
Returns:a read operation that when executed will explain this operation
/**
     * Gets an operation whose execution explains this operation.
     *
     * @param explainVerbosity the explain verbosity
     * @return a read operation that when executed will explain this operation
     */
    public ReadOperation<BsonDocument> asExplainableOperation(final ExplainVerbosity explainVerbosity) {
        notNull("explainVerbosity", explainVerbosity);
        return new ReadOperation<BsonDocument>() {
            @Override
            public BsonDocument execute(final ReadBinding binding) {
                return withConnection(binding, new CallableWithConnectionAndSource<BsonDocument>() {
                    @Override
                    public BsonDocument call(final ConnectionSource connectionSource, final Connection connection) {
                        ReadBinding singleConnectionBinding = new SingleConnectionReadBinding(binding.getReadPreference(),
                                                                                              connectionSource.getServerDescription(),
                                                                                              connection);
                        try {
                            if (serverIsAtLeastVersionThreeDotTwo(connection.getDescription())) {
                                try {
                                    return new CommandReadOperation<BsonDocument>(getNamespace().getDatabaseName(),
                                                                                  new BsonDocument("explain",
                                                                                                   getCommand(binding.getSessionContext())),
                                                                                  new BsonDocumentCodec()).execute(singleConnectionBinding);
                                } catch (MongoCommandException e) {
                                    throw new MongoQueryException(e);
                                }
                            } else {
                                BatchCursor<BsonDocument> cursor = createExplainableQueryOperation().execute(singleConnectionBinding);
                                try {
                                    return cursor.next().iterator().next();
                                } finally {
                                    cursor.close();
                                }
                            }
                        } finally {
                            singleConnectionBinding.release();
                        }
                    }
                });
            }
        };
    }

    
Gets an operation whose execution explains this operation.

Params:
  • explainVerbosity – the explain verbosity
Returns:a read operation that when executed will explain this operation
/**
     * Gets an operation whose execution explains this operation.
     *
     * @param explainVerbosity the explain verbosity
     * @return a read operation that when executed will explain this operation
     */
    public AsyncReadOperation<BsonDocument> asExplainableOperationAsync(final ExplainVerbosity explainVerbosity) {
        notNull("explainVerbosity", explainVerbosity);
        return new AsyncReadOperation<BsonDocument>() {
            @Override
            public void executeAsync(final AsyncReadBinding binding, final SingleResultCallback<BsonDocument> callback) {
                withAsyncReadConnection(binding, new AsyncCallableWithConnectionAndSource() {
                    @Override
                    public void call(final AsyncConnectionSource connectionSource, final AsyncConnection connection, final Throwable t) {
                        SingleResultCallback<BsonDocument> errHandlingCallback = errorHandlingCallback(callback, LOGGER);
                        if (t != null) {
                            errHandlingCallback.onResult(null, t);
                        } else {
                            AsyncReadBinding singleConnectionReadBinding =
                            new AsyncSingleConnectionReadBinding(binding.getReadPreference(), connectionSource.getServerDescription(),
                                                                 connection);

                            if (serverIsAtLeastVersionThreeDotTwo(connection.getDescription())) {
                                new CommandReadOperation<BsonDocument>(namespace.getDatabaseName(),
                                                                       new BsonDocument("explain", getCommand(binding.getSessionContext())),
                                                                       new BsonDocumentCodec())
                                .executeAsync(singleConnectionReadBinding,
                                              releasingCallback(exceptionTransformingCallback(errHandlingCallback),
                                                                singleConnectionReadBinding, connectionSource, connection));
                            } else {
                                createExplainableQueryOperation()
                                .executeAsync(singleConnectionReadBinding,
                                              releasingCallback(new ExplainResultCallback(errHandlingCallback),
                                                      singleConnectionReadBinding, connectionSource, connection));
                            }
                        }
                    }
                });
            }
        };
    }

    private FindOperation<BsonDocument> createExplainableQueryOperation() {
        FindOperation<BsonDocument> explainFindOperation = new FindOperation<BsonDocument>(namespace, new BsonDocumentCodec());

        BsonDocument explainModifiers = new BsonDocument();
        if (modifiers != null) {
            explainModifiers.putAll(modifiers);
        }
        explainModifiers.append("$explain", BsonBoolean.TRUE);

        return explainFindOperation.filter(filter)
               .projection(projection)
               .sort(sort)
               .skip(skip)
               .limit(Math.abs(limit) * -1)
               .hint(hint)
               .min(min)
               .max(max)
               .modifiers(explainModifiers);

    }

    private BsonDocument asDocument(final ConnectionDescription connectionDescription, final ReadPreference readPreference) {
        BsonDocument document = new BsonDocument();

        if (modifiers != null) {
            document.putAll(modifiers);
        }
        if (sort != null) {
            document.put("$orderby", sort);
        }
        if (maxTimeMS > 0) {
            document.put("$maxTimeMS", new BsonInt64(maxTimeMS));
        }
        if (connectionDescription.getServerType() == SHARD_ROUTER && !readPreference.equals(primary())) {
            document.put("$readPreference", readPreference.toDocument());
        }
        if (comment != null) {
            document.put("$comment", new BsonString(comment));
        }
        if (hint != null) {
            document.put("$hint", hint);
        }
        if (max != null) {
            document.put("$max", max);
        }
        if (min != null) {
            document.put("$min", min);
        }
        if (maxScan > 0) {
            document.put("$maxScan", new BsonInt64(maxScan));
        }
        if (returnKey) {
            document.put("$returnKey", BsonBoolean.TRUE);
        }
        if (showRecordId) {
            document.put("$showDiskLoc", BsonBoolean.TRUE);
        }
        if (snapshot) {
            document.put("$snapshot", BsonBoolean.TRUE);
        }

        if (document.isEmpty()) {
            document = filter != null ? filter : new BsonDocument();
        } else if (filter != null) {
            document.put("$query", filter);
        } else if (!document.containsKey("$query")) {
            document.put("$query", new BsonDocument());
        }

        return document;
    }

    private static final Map<String, String> META_OPERATOR_TO_COMMAND_FIELD_MAP = new HashMap<String, String>();

    static {
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$query", "filter");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$orderby", "sort");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$hint", "hint");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$comment", "comment");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$maxScan", "maxScan");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$maxTimeMS", "maxTimeMS");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$max", "max");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$min", "min");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$returnKey", "returnKey");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$showDiskLoc", "showRecordId");
        META_OPERATOR_TO_COMMAND_FIELD_MAP.put("$snapshot", "snapshot");
    }

    private BsonDocument getCommand(final SessionContext sessionContext) {
        BsonDocument commandDocument = new BsonDocument("find", new BsonString(namespace.getCollectionName()));

        appendReadConcernToCommand(sessionContext, commandDocument);

        if (modifiers != null) {
            for (Map.Entry<String, BsonValue> cur : modifiers.entrySet()) {
                String commandFieldName = META_OPERATOR_TO_COMMAND_FIELD_MAP.get(cur.getKey());
                if (commandFieldName != null) {
                    commandDocument.append(commandFieldName, cur.getValue());
                }
            }
        }
        putIfNotNullOrEmpty(commandDocument, "filter", filter);
        putIfNotNullOrEmpty(commandDocument, "sort", sort);
        putIfNotNullOrEmpty(commandDocument, "projection", projection);
        if (skip > 0) {
            commandDocument.put("skip", new BsonInt32(skip));
        }
        if (limit != 0) {
            commandDocument.put("limit", new BsonInt32(Math.abs(limit)));
        }
        if (limit >= 0) {
            if (batchSize < 0 && Math.abs(batchSize) < limit) {
                commandDocument.put("limit", new BsonInt32(Math.abs(batchSize)));
            } else if (batchSize != 0) {
                commandDocument.put("batchSize", new BsonInt32(Math.abs(batchSize)));
            }
        }
        if (limit < 0 || batchSize < 0) {
            commandDocument.put("singleBatch", BsonBoolean.TRUE);
        }
        if (maxTimeMS > 0) {
            commandDocument.put("maxTimeMS", new BsonInt64(maxTimeMS));
        }
        if (isTailableCursor()) {
            commandDocument.put("tailable", BsonBoolean.TRUE);
        }
        if (isAwaitData()) {
            commandDocument.put("awaitData", BsonBoolean.TRUE);
        }
        if (oplogReplay) {
            commandDocument.put("oplogReplay", BsonBoolean.TRUE);
        }
        if (noCursorTimeout) {
            commandDocument.put("noCursorTimeout", BsonBoolean.TRUE);
        }
        if (partial) {
            commandDocument.put("allowPartialResults", BsonBoolean.TRUE);
        }
        if (collation != null) {
            commandDocument.put("collation", collation.asDocument());
        }
        if (comment != null) {
            commandDocument.put("comment", new BsonString(comment));
        }
        if (hint != null) {
            commandDocument.put("hint", hint);
        }
        if (max != null) {
            commandDocument.put("max", max);
        }
        if (min != null) {
            commandDocument.put("min", min);
        }
        if (maxScan > 0) {
            commandDocument.put("maxScan", new BsonInt64(maxScan));
        }
        if (returnKey) {
            commandDocument.put("returnKey", BsonBoolean.TRUE);
        }
        if (showRecordId) {
            commandDocument.put("showRecordId", BsonBoolean.TRUE);
        }
        if (snapshot) {
            commandDocument.put("snapshot", BsonBoolean.TRUE);
        }
        return commandDocument;
    }

    private BsonDocument wrapInExplainIfNecessary(final BsonDocument commandDocument) {
        if (isExplain()) {
            return new BsonDocument("explain", commandDocument);
        } else {
            return commandDocument;
        }
    }

    private CommandCreator getCommandCreator(final SessionContext sessionContext) {
        return new CommandOperationHelper.CommandCreator() {
            @Override
            public BsonDocument create(final ServerDescription serverDescription, final ConnectionDescription connectionDescription) {
                validateReadConcernAndCollation(connectionDescription, sessionContext.getReadConcern(), collation);
                return wrapInExplainIfNecessary(getCommand(sessionContext));
            }
        };
    }

    private boolean isExplain() {
        return modifiers != null && modifiers.get("$explain", BsonBoolean.FALSE).equals(BsonBoolean.TRUE);
    }

    private boolean isTailableCursor() {
        return cursorType.isTailable();
    }

    private boolean isAwaitData() {
        return cursorType == CursorType.TailableAwait;
    }

    private CommandReadTransformer<BsonDocument, AggregateResponseBatchCursor<T>> transformer() {
        return new CommandReadTransformer<BsonDocument, AggregateResponseBatchCursor<T>>() {
            @Override
            public AggregateResponseBatchCursor<T> apply(final BsonDocument result, final ConnectionSource source,
                                                         final Connection connection) {
                QueryResult<T> queryResult = documentToQueryResult(result, connection.getDescription().getServerAddress());
                return new QueryBatchCursor<T>(queryResult, limit, batchSize, getMaxTimeForCursor(), decoder, source, connection, result);
            }
        };
    }

    private long getMaxTimeForCursor() {
        return cursorType == CursorType.TailableAwait ? maxAwaitTimeMS : 0;
    }

    private CommandReadTransformerAsync<BsonDocument, AsyncBatchCursor<T>> asyncTransformer() {
        return new CommandReadTransformerAsync<BsonDocument, AsyncBatchCursor<T>>() {
            @Override
            public AsyncBatchCursor<T> apply(final BsonDocument result, final AsyncConnectionSource source,
                                             final AsyncConnection connection) {
                QueryResult<T> queryResult = documentToQueryResult(result, connection.getDescription().getServerAddress());
                return new AsyncQueryBatchCursor<T>(queryResult, limit, batchSize, getMaxTimeForCursor(), decoder, source, connection,
                        result);
            }
        };
    }

    private QueryResult<T> documentToQueryResult(final BsonDocument result, final ServerAddress serverAddress) {
        QueryResult<T> queryResult;
        if (isExplain()) {
            T decodedDocument = decoder.decode(new BsonDocumentReader(result), DecoderContext.builder().build());
            queryResult = new QueryResult<T>(getNamespace(), Collections.singletonList(decodedDocument), 0, serverAddress);
        } else {
            queryResult = cursorDocumentToQueryResult(result.getDocument("cursor"), serverAddress);
        }
        return queryResult;
    }

    private static class ExplainResultCallback implements SingleResultCallback<AsyncBatchCursor<BsonDocument>> {
        private final SingleResultCallback<BsonDocument> callback;

        ExplainResultCallback(final SingleResultCallback<BsonDocument> callback) {
            this.callback = callback;
        }

        @Override
        public void onResult(final AsyncBatchCursor<BsonDocument> cursor, final Throwable t) {
            if (t != null) {
                callback.onResult(null, t);
            } else {
                cursor.next(new SingleResultCallback<List<BsonDocument>>() {
                    @Override
                    public void onResult(final List<BsonDocument> result, final Throwable t) {
                        cursor.close();
                        if (t != null) {
                            callback.onResult(null, t);
                        } else if (result == null || result.size() == 0) {
                            callback.onResult(null, new MongoInternalException("Expected explain result"));
                        } else {
                            callback.onResult(result.get(0), null);
                        }
                    }
                });
            }
        }
    }
}