/*
 * Copyright (c) 2012, 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package javax.json;

import java.io.Closeable;

Writes a JSON object or array structure to an output source. 
The class Json contains methods to create writers from output sources (OutputStream and Writer). 

The following example demonstrates how write an empty JSON object:

JsonWriter jsonWriter = Json.createWriter(...);
jsonWriter.writeObject(Json.createObjectBuilder().build());
jsonWriter.close();


 The class JsonWriterFactory also contains methods to create JsonWriter instances. A factory instance can be used to create multiple writer instances with the same configuration. This the preferred way to create multiple instances. A sample usage is shown in the following example: 

JsonWriterFactory factory = Json.createWriterFactory(config);
JsonWriter writer1 = factory.createWriter(...);
JsonWriter writer2 = factory.createWriter(...);


/**
 * Writes a JSON {@link JsonObject object} or {@link JsonArray array} structure
 * to an output source.
 *
 * <p>The class {@link javax.json.Json} contains methods to create writers from
 * output sources ({@link java.io.OutputStream} and {@link java.io.Writer}).
 *
 * <p>
 * The following example demonstrates how write an empty JSON object:
 * <pre>
 * <code>
 * JsonWriter jsonWriter = Json.createWriter(...);
 * jsonWriter.writeObject(Json.createObjectBuilder().build());
 * jsonWriter.close();
 * </code>
 * </pre>
 *
 * <p>
 * The class {@link JsonWriterFactory} also contains methods to create
 * {@code JsonWriter} instances. A factory instance can be used to create
 * multiple writer instances with the same configuration. This the preferred
 * way to create multiple instances. A sample usage is shown in the following
 * example:
 * <pre>
 * <code>
 * JsonWriterFactory factory = Json.createWriterFactory(config);
 * JsonWriter writer1 = factory.createWriter(...);
 * JsonWriter writer2 = factory.createWriter(...);
 * </code>
 * </pre>
 */
public interface JsonWriter extends  /*Auto*/Closeable {

    
Writes the specified JSON array to the output source. This method needs to be called only once for a writer instance. 
Params:
array – JSON array that is to be written to the output source
Throws:
JsonException – if the specified JSON object cannot be
    written due to i/o error (IOException would be cause of
    JsonException)
IllegalStateException – if writeArray, writeObject, write or close
    method is already called/**
     * Writes the specified JSON {@link JsonArray array} to the output
     * source. This method needs to be called only once for a writer instance.
     *
     * @param array JSON array that is to be written to the output source
     * @throws JsonException if the specified JSON object cannot be
     *     written due to i/o error (IOException would be cause of
     *     JsonException)
     * @throws IllegalStateException if writeArray, writeObject, write or close
     *     method is already called
     */
    void writeArray(JsonArray array);

    
Writes the specified JSON object to the output source. This method needs to be called only once for a writer instance. 
Params:
object – JSON object that is to be written to the output source
Throws:
JsonException – if the specified JSON object cannot be
    written due to i/o error (IOException would be cause of JsonException)
IllegalStateException – if writeArray, writeObject, write or close
    method is already called/**
     * Writes the specified JSON {@link JsonObject object} to the output
     * source. This method needs to be called only once for a writer instance.
     *
     * @param object JSON object that is to be written to the output source
     * @throws JsonException if the specified JSON object cannot be
     *     written due to i/o error (IOException would be cause of JsonException)
     * @throws IllegalStateException if writeArray, writeObject, write or close
     *     method is already called
     */
    void writeObject(JsonObject object);

    
Writes the specified JSON object or array to the output source. This method needs to be called only once for a writer instance. 
Params:
value – JSON array or object that is to be written to the output
             source
Throws:
JsonException – if the specified JSON object cannot be
    written due to i/o error (IOException would be cause of
    JsonException)
IllegalStateException – if writeArray, writeObject, write
    or close method is already called/**
     * Writes the specified JSON {@link JsonObject object} or
     * {@link JsonArray array} to the output source. This method needs
     * to be called only once for a writer instance.
     *
     * @param value JSON array or object that is to be written to the output
     *              source
     * @throws JsonException if the specified JSON object cannot be
     *     written due to i/o error (IOException would be cause of
     *     JsonException)
     * @throws IllegalStateException if writeArray, writeObject, write
     *     or close method is already called
     */
    void write(JsonStructure value);

    /**
     * Closes this JSON writer and frees any resources associated with the
     * writer. This method closes the underlying output source.
     *
     * @throws JsonException if an i/o error occurs (IOException would be
     * cause of JsonException)
     */

    
Writes the specified JsonValue to the output source. method needs to be called only once for a write instance. 
Params:
value – a JsonValue to be written to the output source
Throws:
JsonException – if the specified JSON object cannot be
    written due to i/o error (IOException would be cause of
    JsonException)
IllegalStateException – if writeArray, writeObject, write
    or close method is already called
Since:
1.1/**
     * Writes the specified {@link JsonValue} to the output source.
     * method needs to be called only once for a write instance.
     *
     * @param value a {@code JsonValue} to be written to the output
     *              source
     * @throws JsonException if the specified JSON object cannot be
     *     written due to i/o error (IOException would be cause of
     *     JsonException)
     * @throws IllegalStateException if writeArray, writeObject, write
     *     or close method is already called
     *
     * @since 1.1
     */
    default void write(JsonValue value) {
        throw new UnsupportedOperationException();
    }

    @Override
    void close();

}