package com.fasterxml.jackson.databind.ser.std;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.*;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonMapFormatVisitor;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.ContainerSerializer;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.ser.PropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.databind.util.ArrayBuilders;
import com.fasterxml.jackson.databind.util.BeanUtil;
import com.fasterxml.jackson.databind.util.ClassUtil;

Standard serializer implementation for serializing {link java.util.Map} types.

Note: about the only configurable setting currently is ability to filter out entries with specified names.

/** * Standard serializer implementation for serializing {link java.util.Map} types. *<p> * Note: about the only configurable setting currently is ability to filter out * entries with specified names. */
@JacksonStdImpl public class MapSerializer extends ContainerSerializer<Map<?,?>> implements ContextualSerializer { private static final long serialVersionUID = 1L; protected final static JavaType UNSPECIFIED_TYPE = TypeFactory.unknownType();
Since:2.9
/** * @since 2.9 */
public final static Object MARKER_FOR_EMPTY = JsonInclude.Include.NON_EMPTY; /* /********************************************************** /* Basic information about referring property, type /********************************************************** */
Map-valued property being serialized with this instance
/** * Map-valued property being serialized with this instance */
protected final BeanProperty _property;
Whether static types should be used for serialization of values or not (if not, dynamic runtime type is used)
/** * Whether static types should be used for serialization of values * or not (if not, dynamic runtime type is used) */
protected final boolean _valueTypeIsStatic;
Declared type of keys
/** * Declared type of keys */
protected final JavaType _keyType;
Declared type of contained values
/** * Declared type of contained values */
protected final JavaType _valueType; /* /********************************************************** /* Serializers used /********************************************************** */
Key serializer to use, if it can be statically determined
/** * Key serializer to use, if it can be statically determined */
protected JsonSerializer<Object> _keySerializer;
Value serializer to use, if it can be statically determined
/** * Value serializer to use, if it can be statically determined */
protected JsonSerializer<Object> _valueSerializer;
Type identifier serializer used for values, if any.
/** * Type identifier serializer used for values, if any. */
protected final TypeSerializer _valueTypeSerializer;
If value type cannot be statically determined, mapping from runtime value types to serializers are stored in this object.
/** * If value type cannot be statically determined, mapping from * runtime value types to serializers are stored in this object. */
protected PropertySerializerMap _dynamicValueSerializers; /* /********************************************************** /* Config settings, filtering /********************************************************** */
Set of entries to omit during serialization, if any
/** * Set of entries to omit during serialization, if any */
protected final Set<String> _ignoredEntries;
Id of the property filter to use, if any; null if none.
Since:2.3
/** * Id of the property filter to use, if any; null if none. * * @since 2.3 */
protected final Object _filterId;
Value that indicates suppression mechanism to use for values contained; either "filter" (of which equals() is called), or marker value of MARKER_FOR_EMPTY, or null to indicate no filtering for non-null values. Note that inclusion value for Map instance itself is handled by caller (POJO property that refers to the Map value).
Since:2.5
/** * Value that indicates suppression mechanism to use for <b>values contained</b>; * either "filter" (of which <code>equals()</code> is called), or marker * value of {@link #MARKER_FOR_EMPTY}, or null to indicate no filtering for * non-null values. * Note that inclusion value for Map instance itself is handled by caller (POJO * property that refers to the Map value). * * @since 2.5 */
protected final Object _suppressableValue;
Flag that indicates what to do with `null` values, distinct from handling of _suppressableValue
Since:2.9
/** * Flag that indicates what to do with `null` values, distinct from * handling of {@link #_suppressableValue} * * @since 2.9 */
protected final boolean _suppressNulls; /* /********************************************************** /* Config settings, other /********************************************************** */
Flag set if output is forced to be sorted by keys (usually due to annotation).
Since:2.4
/** * Flag set if output is forced to be sorted by keys (usually due * to annotation). * * @since 2.4 */
protected final boolean _sortKeys; /* /********************************************************** /* Life-cycle /********************************************************** */
Since:2.5
/** * @since 2.5 */
@SuppressWarnings("unchecked") protected MapSerializer(Set<String> ignoredEntries, JavaType keyType, JavaType valueType, boolean valueTypeIsStatic, TypeSerializer vts, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer) { super(Map.class, false); _ignoredEntries = ((ignoredEntries == null) || ignoredEntries.isEmpty()) ? null : ignoredEntries; _keyType = keyType; _valueType = valueType; _valueTypeIsStatic = valueTypeIsStatic; _valueTypeSerializer = vts; _keySerializer = (JsonSerializer<Object>) keySerializer; _valueSerializer = (JsonSerializer<Object>) valueSerializer; _dynamicValueSerializers = PropertySerializerMap.emptyForProperties(); _property = null; _filterId = null; _sortKeys = false; _suppressableValue = null; _suppressNulls = false; } @SuppressWarnings("unchecked") protected MapSerializer(MapSerializer src, BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, Set<String> ignoredEntries) { super(Map.class, false); _ignoredEntries = ((ignoredEntries == null) || ignoredEntries.isEmpty()) ? null : ignoredEntries; _keyType = src._keyType; _valueType = src._valueType; _valueTypeIsStatic = src._valueTypeIsStatic; _valueTypeSerializer = src._valueTypeSerializer; _keySerializer = (JsonSerializer<Object>) keySerializer; _valueSerializer = (JsonSerializer<Object>) valueSerializer; // [databind#2181]: may not be safe to reuse, start from empty _dynamicValueSerializers = PropertySerializerMap.emptyForProperties(); _property = property; _filterId = src._filterId; _sortKeys = src._sortKeys; _suppressableValue = src._suppressableValue; _suppressNulls = src._suppressNulls; }
Since:2.9
/** * @since 2.9 */
protected MapSerializer(MapSerializer src, TypeSerializer vts, Object suppressableValue, boolean suppressNulls) { super(Map.class, false); _ignoredEntries = src._ignoredEntries; _keyType = src._keyType; _valueType = src._valueType; _valueTypeIsStatic = src._valueTypeIsStatic; _valueTypeSerializer = vts; _keySerializer = src._keySerializer; _valueSerializer = src._valueSerializer; // 22-Nov-2018, tatu: probably safe (even with [databind#2181]) since it's just // inclusion, type serializer but NOT serializer _dynamicValueSerializers = src._dynamicValueSerializers; _property = src._property; _filterId = src._filterId; _sortKeys = src._sortKeys; _suppressableValue = suppressableValue; _suppressNulls = suppressNulls; } protected MapSerializer(MapSerializer src, Object filterId, boolean sortKeys) { super(Map.class, false); _ignoredEntries = src._ignoredEntries; _keyType = src._keyType; _valueType = src._valueType; _valueTypeIsStatic = src._valueTypeIsStatic; _valueTypeSerializer = src._valueTypeSerializer; _keySerializer = src._keySerializer; _valueSerializer = src._valueSerializer; // [databind#2181]: may not be safe to reuse, start from empty _dynamicValueSerializers = PropertySerializerMap.emptyForProperties(); _property = src._property; _filterId = filterId; _sortKeys = sortKeys; _suppressableValue = src._suppressableValue; _suppressNulls = src._suppressNulls; } @Override public MapSerializer _withValueTypeSerializer(TypeSerializer vts) { if (_valueTypeSerializer == vts) { return this; } _ensureOverride("_withValueTypeSerializer"); return new MapSerializer(this, vts, _suppressableValue, _suppressNulls); }
Since:2.4
/** * @since 2.4 */
public MapSerializer withResolved(BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, Set<String> ignored, boolean sortKeys) { _ensureOverride("withResolved"); MapSerializer ser = new MapSerializer(this, property, keySerializer, valueSerializer, ignored); if (sortKeys != ser._sortKeys) { ser = new MapSerializer(ser, _filterId, sortKeys); } return ser; } @Override public MapSerializer withFilterId(Object filterId) { if (_filterId == filterId) { return this; } _ensureOverride("withFilterId"); return new MapSerializer(this, filterId, _sortKeys); }
Mutant factory for constructing an instance with different inclusion strategy for content (Map values).
Since:2.9
/** * Mutant factory for constructing an instance with different inclusion strategy * for content (Map values). * * @since 2.9 */
public MapSerializer withContentInclusion(Object suppressableValue, boolean suppressNulls) { if ((suppressableValue == _suppressableValue) && (suppressNulls == _suppressNulls)) { return this; } _ensureOverride("withContentInclusion"); return new MapSerializer(this, _valueTypeSerializer, suppressableValue, suppressNulls); }
Since:2.8
/** * @since 2.8 */
public static MapSerializer construct(Set<String> ignoredEntries, JavaType mapType, boolean staticValueType, TypeSerializer vts, JsonSerializer<Object> keySerializer, JsonSerializer<Object> valueSerializer, Object filterId) { JavaType keyType, valueType; if (mapType == null) { keyType = valueType = UNSPECIFIED_TYPE; } else { keyType = mapType.getKeyType(); if (mapType.hasRawClass(java.util.Properties.class)) { // 25-Mar-2020, tatu: [databind#2657] Since non-standard Properties may actually // contain non-Strings, demote value type to raw `Object` valueType = TypeFactory.unknownType(); } else { valueType = mapType.getContentType(); } } // If value type is final, it's same as forcing static value typing: if (!staticValueType) { staticValueType = (valueType != null && valueType.isFinal()); } else { // also: Object.class cannot be handled as static, ever if (valueType.getRawClass() == Object.class) { staticValueType = false; } } MapSerializer ser = new MapSerializer(ignoredEntries, keyType, valueType, staticValueType, vts, keySerializer, valueSerializer); if (filterId != null) { ser = ser.withFilterId(filterId); } return ser; }
Since:2.9
/** * @since 2.9 */
protected void _ensureOverride(String method) { ClassUtil.verifyMustOverride(MapSerializer.class, this, method); }
Since:2.5
/** * @since 2.5 */
@Deprecated // since 2.9 protected void _ensureOverride() { _ensureOverride("N/A"); } /* /********************************************************** /* Deprecated creators /********************************************************** */
Since:2.5
Deprecated:// since 2.9
/** * @since 2.5 * @deprecated // since 2.9 */
@Deprecated // since 2.9 protected MapSerializer(MapSerializer src, TypeSerializer vts, Object suppressableValue) { this(src, vts, suppressableValue, false); }
Deprecated:since 2.9
/** * @deprecated since 2.9 */
@Deprecated // since 2.9 public MapSerializer withContentInclusion(Object suppressableValue) { return new MapSerializer(this, _valueTypeSerializer, suppressableValue, _suppressNulls); }
Since:2.3
Deprecated:Since 2.8 use the other overload
/** * @since 2.3 * * @deprecated Since 2.8 use the other overload */
@Deprecated // since 2.8 public static MapSerializer construct(String[] ignoredList, JavaType mapType, boolean staticValueType, TypeSerializer vts, JsonSerializer<Object> keySerializer, JsonSerializer<Object> valueSerializer, Object filterId) { Set<String> ignoredEntries = ArrayBuilders.arrayToSet(ignoredList); return construct(ignoredEntries, mapType, staticValueType, vts, keySerializer, valueSerializer, filterId); } /* /********************************************************** /* Post-processing (contextualization) /********************************************************** */ @Override public JsonSerializer<?> createContextual(SerializerProvider provider, BeanProperty property) throws JsonMappingException { JsonSerializer<?> ser = null; JsonSerializer<?> keySer = null; final AnnotationIntrospector intr = provider.getAnnotationIntrospector(); final AnnotatedMember propertyAcc = (property == null) ? null : property.getMember(); // First: if we have a property, may have property-annotation overrides if (_neitherNull(propertyAcc, intr)) { Object serDef = intr.findKeySerializer(propertyAcc); if (serDef != null) { keySer = provider.serializerInstance(propertyAcc, serDef); } serDef = intr.findContentSerializer(propertyAcc); if (serDef != null) { ser = provider.serializerInstance(propertyAcc, serDef); } } if (ser == null) { ser = _valueSerializer; } // [databind#124]: May have a content converter ser = findContextualConvertingSerializer(provider, property, ser); if (ser == null) { // 30-Sep-2012, tatu: One more thing -- if explicit content type is annotated, // we can consider it a static case as well. // 20-Aug-2013, tatu: Need to avoid trying to access serializer for java.lang.Object tho if (_valueTypeIsStatic && !_valueType.isJavaLangObject()) { ser = provider.findContentValueSerializer(_valueType, property); } } if (keySer == null) { keySer = _keySerializer; } if (keySer == null) { keySer = provider.findKeySerializer(_keyType, property); } else { keySer = provider.handleSecondaryContextualization(keySer, property); } Set<String> ignored = _ignoredEntries; boolean sortKeys = false; if (_neitherNull(propertyAcc, intr)) { JsonIgnoreProperties.Value ignorals = intr.findPropertyIgnorals(propertyAcc); if (ignorals != null){ Set<String> newIgnored = ignorals.findIgnoredForSerialization(); if (_nonEmpty(newIgnored)) { ignored = (ignored == null) ? new HashSet<String>() : new HashSet<String>(ignored); for (String str : newIgnored) { ignored.add(str); } } } Boolean b = intr.findSerializationSortAlphabetically(propertyAcc); sortKeys = Boolean.TRUE.equals(b); } JsonFormat.Value format = findFormatOverrides(provider, property, Map.class); if (format != null) { Boolean B = format.getFeature(JsonFormat.Feature.WRITE_SORTED_MAP_ENTRIES); if (B != null) { sortKeys = B.booleanValue(); } } MapSerializer mser = withResolved(property, keySer, ser, ignored, sortKeys); // [databind#307]: allow filtering if (property != null) { AnnotatedMember m = property.getMember(); if (m != null) { Object filterId = intr.findFilterId(m); if (filterId != null) { mser = mser.withFilterId(filterId); } } } JsonInclude.Value inclV = findIncludeOverrides(provider, property, Map.class); if (inclV != null) { JsonInclude.Include incl = inclV.getContentInclusion(); if (incl != JsonInclude.Include.USE_DEFAULTS) { Object valueToSuppress; boolean suppressNulls; switch (incl) { case NON_DEFAULT: valueToSuppress = BeanUtil.getDefaultValue(_valueType); suppressNulls = true; if (valueToSuppress != null) { if (valueToSuppress.getClass().isArray()) { valueToSuppress = ArrayBuilders.getArrayComparator(valueToSuppress); } } break; case NON_ABSENT: suppressNulls = true; valueToSuppress = _valueType.isReferenceType() ? MARKER_FOR_EMPTY : null; break; case NON_EMPTY: suppressNulls = true; valueToSuppress = MARKER_FOR_EMPTY; break; case CUSTOM: valueToSuppress = provider.includeFilterInstance(null, inclV.getContentFilter()); if (valueToSuppress == null) { // is this legal? suppressNulls = true; } else { suppressNulls = provider.includeFilterSuppressNulls(valueToSuppress); } break; case NON_NULL: valueToSuppress = null; suppressNulls = true; break; case ALWAYS: // default default: valueToSuppress = null; // 30-Sep-2016, tatu: Should not need to check global flags here, // if inclusion forced to be ALWAYS suppressNulls = false; break; } mser = mser.withContentInclusion(valueToSuppress, suppressNulls); } } return mser; } /* /********************************************************** /* Accessors /********************************************************** */ @Override public JavaType getContentType() { return _valueType; } @Override public JsonSerializer<?> getContentSerializer() { return _valueSerializer; } @Override public boolean isEmpty(SerializerProvider prov, Map<?,?> value) { if (value.isEmpty()) { return true; } // 05-Nove-2015, tatu: Simple cases are cheap, but for recursive // emptiness checking we actually need to see if values are empty as well. Object supp = _suppressableValue; if ((supp == null) && !_suppressNulls) { return false; } JsonSerializer<Object> valueSer = _valueSerializer; final boolean checkEmpty = (MARKER_FOR_EMPTY == supp); if (valueSer != null) { for (Object elemValue : value.values()) { if (elemValue == null) { if (_suppressNulls) { continue; } return false; } if (checkEmpty) { if (!valueSer.isEmpty(prov, elemValue)) { return false; } } else if ((supp == null) || !supp.equals(value)) { return false; } } return true; } // But if not statically known, try this: for (Object elemValue : value.values()) { if (elemValue == null) { if (_suppressNulls) { continue; } return false; } try { valueSer = _findSerializer(prov, elemValue); } catch (JsonMappingException e) { // Ugh... cannot just throw as-is, so... // 05-Nov-2015, tatu: For now, probably best not to assume empty then return false; } if (checkEmpty) { if (!valueSer.isEmpty(prov, elemValue)) { return false; } } else if ((supp == null) || !supp.equals(value)) { return false; } } return true; } @Override public boolean hasSingleElement(Map<?,?> value) { return (value.size() == 1); } /* /********************************************************** /* Extended API /********************************************************** */
Accessor for currently assigned key serializer. Note that this may return null during construction of MapSerializer: depedencies are resolved during createContextual method (which can be overridden by custom implementations), but for some dynamic types, it is possible that serializer is only resolved during actual serialization.
Since:2.0
/** * Accessor for currently assigned key serializer. Note that * this may return null during construction of <code>MapSerializer</code>: * depedencies are resolved during {@link #createContextual} method * (which can be overridden by custom implementations), but for some * dynamic types, it is possible that serializer is only resolved * during actual serialization. * * @since 2.0 */
public JsonSerializer<?> getKeySerializer() { return _keySerializer; } /* /********************************************************** /* JsonSerializer implementation /********************************************************** */ @Override public void serialize(Map<?,?> value, JsonGenerator gen, SerializerProvider provider) throws IOException { gen.writeStartObject(value); serializeWithoutTypeInfo(value, gen, provider); gen.writeEndObject(); } @Override public void serializeWithType(Map<?,?> value, JsonGenerator gen, SerializerProvider provider, TypeSerializer typeSer) throws IOException { // [databind#631]: Assign current value, to be accessible by custom serializers gen.setCurrentValue(value); WritableTypeId typeIdDef = typeSer.writeTypePrefix(gen, typeSer.typeId(value, JsonToken.START_OBJECT)); serializeWithoutTypeInfo(value, gen, provider); typeSer.writeTypeSuffix(gen, typeIdDef); } /* /********************************************************** /* Secondary serialization methods /********************************************************** */
General-purpose serialization for contents without writing object type. Will suppress, filter and use custom serializers.

Public since it also is called by AnyGetterWriter.

Since:2.11
/** * General-purpose serialization for contents without writing object type. Will suppress, filter and * use custom serializers. *<p> * Public since it also is called by {@code AnyGetterWriter}. * * @since 2.11 */
public void serializeWithoutTypeInfo(Map<?, ?> value, JsonGenerator gen, SerializerProvider provider) throws IOException { if (!value.isEmpty()) { if (_sortKeys || provider.isEnabled(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS)) { value = _orderEntries(value, gen, provider); } PropertyFilter pf; if ((_filterId != null) && (pf = findPropertyFilter(provider, _filterId, value)) != null) { serializeFilteredFields(value, gen, provider, pf, _suppressableValue); } else if ((_suppressableValue != null) || _suppressNulls) { serializeOptionalFields(value, gen, provider, _suppressableValue); } else if (_valueSerializer != null) { serializeFieldsUsing(value, gen, provider, _valueSerializer); } else { serializeFields(value, gen, provider); } } }
General-purpose serialization for contents, where we do not necessarily know the value serialization, but we do know that no value suppression is needed (which simplifies processing a bit)
/** * General-purpose serialization for contents, where we do not necessarily know * the value serialization, but * we do know that no value suppression is needed (which simplifies processing a bit) */
public void serializeFields(Map<?,?> value, JsonGenerator gen, SerializerProvider provider) throws IOException { // If value type needs polymorphic type handling, some more work needed: if (_valueTypeSerializer != null) { serializeTypedFields(value, gen, provider, null); return; } final JsonSerializer<Object> keySerializer = _keySerializer; final Set<String> ignored = _ignoredEntries; Object keyElem = null; try { for (Map.Entry<?,?> entry : value.entrySet()) { Object valueElem = entry.getValue(); // First, serialize key keyElem = entry.getKey(); if (keyElem == null) { provider.findNullKeySerializer(_keyType, _property).serialize(null, gen, provider); } else { // One twist: is entry ignorable? If so, skip if ((ignored != null) && ignored.contains(keyElem)) { continue; } keySerializer.serialize(keyElem, gen, provider); } // And then value if (valueElem == null) { provider.defaultSerializeNull(gen); continue; } JsonSerializer<Object> serializer = _valueSerializer; if (serializer == null) { serializer = _findSerializer(provider, valueElem); } serializer.serialize(valueElem, gen, provider); } } catch (Exception e) { // Add reference information wrapAndThrow(provider, e, value, String.valueOf(keyElem)); } }
Serialization method called when exclusion filtering needs to be applied.
/** * Serialization method called when exclusion filtering needs to be applied. */
public void serializeOptionalFields(Map<?,?> value, JsonGenerator gen, SerializerProvider provider, Object suppressableValue) throws IOException { // If value type needs polymorphic type handling, some more work needed: if (_valueTypeSerializer != null) { serializeTypedFields(value, gen, provider, suppressableValue); return; } final Set<String> ignored = _ignoredEntries; final boolean checkEmpty = (MARKER_FOR_EMPTY == suppressableValue); for (Map.Entry<?,?> entry : value.entrySet()) { // First find key serializer final Object keyElem = entry.getKey(); JsonSerializer<Object> keySerializer; if (keyElem == null) { keySerializer = provider.findNullKeySerializer(_keyType, _property); } else { if (ignored != null && ignored.contains(keyElem)) continue; keySerializer = _keySerializer; } // Then value serializer final Object valueElem = entry.getValue(); JsonSerializer<Object> valueSer; if (valueElem == null) { if (_suppressNulls) { // all suppressions include null-suppression continue; } valueSer = provider.getDefaultNullValueSerializer(); } else { valueSer = _valueSerializer; if (valueSer == null) { valueSer = _findSerializer(provider, valueElem); } // also may need to skip non-empty values: if (checkEmpty) { if (valueSer.isEmpty(provider, valueElem)) { continue; } } else if (suppressableValue != null) { if (suppressableValue.equals(valueElem)) { continue; } } } // and then serialize, if all went well try { keySerializer.serialize(keyElem, gen, provider); valueSer.serialize(valueElem, gen, provider); } catch (Exception e) { wrapAndThrow(provider, e, value, String.valueOf(keyElem)); } } }
Method called to serialize fields, when the value type is statically known, so that value serializer is passed and does not need to be fetched from provider.
/** * Method called to serialize fields, when the value type is statically known, * so that value serializer is passed and does not need to be fetched from * provider. */
public void serializeFieldsUsing(Map<?,?> value, JsonGenerator gen, SerializerProvider provider, JsonSerializer<Object> ser) throws IOException { final JsonSerializer<Object> keySerializer = _keySerializer; final Set<String> ignored = _ignoredEntries; final TypeSerializer typeSer = _valueTypeSerializer; for (Map.Entry<?,?> entry : value.entrySet()) { Object keyElem = entry.getKey(); if (ignored != null && ignored.contains(keyElem)) continue; if (keyElem == null) { provider.findNullKeySerializer(_keyType, _property).serialize(null, gen, provider); } else { keySerializer.serialize(keyElem, gen, provider); } final Object valueElem = entry.getValue(); if (valueElem == null) { provider.defaultSerializeNull(gen); } else { try { if (typeSer == null) { ser.serialize(valueElem, gen, provider); } else { ser.serializeWithType(valueElem, gen, provider, typeSer); } } catch (Exception e) { wrapAndThrow(provider, e, value, String.valueOf(keyElem)); } } } }
Helper method used when we have a JSON Filter to use for potentially filtering out Map entries.
Since:2.5
/** * Helper method used when we have a JSON Filter to use for potentially * filtering out Map entries. * * @since 2.5 */
public void serializeFilteredFields(Map<?,?> value, JsonGenerator gen, SerializerProvider provider, PropertyFilter filter, Object suppressableValue) // since 2.5 throws IOException { final Set<String> ignored = _ignoredEntries; final MapProperty prop = new MapProperty(_valueTypeSerializer, _property); final boolean checkEmpty = (MARKER_FOR_EMPTY == suppressableValue); for (Map.Entry<?,?> entry : value.entrySet()) { // First, serialize key; unless ignorable by key final Object keyElem = entry.getKey(); if (ignored != null && ignored.contains(keyElem)) continue; JsonSerializer<Object> keySerializer; if (keyElem == null) { keySerializer = provider.findNullKeySerializer(_keyType, _property); } else { keySerializer = _keySerializer; } // or by value; nulls often suppressed final Object valueElem = entry.getValue(); JsonSerializer<Object> valueSer; // And then value if (valueElem == null) { if (_suppressNulls) { continue; } valueSer = provider.getDefaultNullValueSerializer(); } else { valueSer = _valueSerializer; if (valueSer == null) { valueSer = _findSerializer(provider, valueElem); } // also may need to skip non-empty values: if (checkEmpty) { if (valueSer.isEmpty(provider, valueElem)) { continue; } } else if (suppressableValue != null) { if (suppressableValue.equals(valueElem)) { continue; } } } // and with that, ask filter to handle it prop.reset(keyElem, valueElem, keySerializer, valueSer); try { filter.serializeAsField(value, gen, provider, prop); } catch (Exception e) { wrapAndThrow(provider, e, value, String.valueOf(keyElem)); } } }
Since:2.5
/** * @since 2.5 */
public void serializeTypedFields(Map<?,?> value, JsonGenerator gen, SerializerProvider provider, Object suppressableValue) // since 2.5 throws IOException { final Set<String> ignored = _ignoredEntries; final boolean checkEmpty = (MARKER_FOR_EMPTY == suppressableValue); for (Map.Entry<?,?> entry : value.entrySet()) { Object keyElem = entry.getKey(); JsonSerializer<Object> keySerializer; if (keyElem == null) { keySerializer = provider.findNullKeySerializer(_keyType, _property); } else { // One twist: is entry ignorable? If so, skip if (ignored != null && ignored.contains(keyElem)) continue; keySerializer = _keySerializer; } final Object valueElem = entry.getValue(); // And then value JsonSerializer<Object> valueSer; if (valueElem == null) { if (_suppressNulls) { // all suppression include null suppression continue; } valueSer = provider.getDefaultNullValueSerializer(); } else { valueSer = _valueSerializer; if (valueSer == null) { valueSer = _findSerializer(provider, valueElem); } // also may need to skip non-empty values: if (checkEmpty) { if (valueSer.isEmpty(provider, valueElem)) { continue; } } else if (suppressableValue != null) { if (suppressableValue.equals(valueElem)) { continue; } } } keySerializer.serialize(keyElem, gen, provider); try { valueSer.serializeWithType(valueElem, gen, provider, _valueTypeSerializer); } catch (Exception e) { wrapAndThrow(provider, e, value, String.valueOf(keyElem)); } } }
Helper method used when we have a JSON Filter to use AND contents are "any properties" of a POJO.
Params:
  • bean – Enclosing POJO that has any-getter used to obtain "any properties"
Since:2.9
/** * Helper method used when we have a JSON Filter to use AND contents are * "any properties" of a POJO. * * @param bean Enclosing POJO that has any-getter used to obtain "any properties" * * @since 2.9 */
public void serializeFilteredAnyProperties(SerializerProvider provider, JsonGenerator gen, Object bean, Map<?,?> value, PropertyFilter filter, Object suppressableValue) throws IOException { final Set<String> ignored = _ignoredEntries; final MapProperty prop = new MapProperty(_valueTypeSerializer, _property); final boolean checkEmpty = (MARKER_FOR_EMPTY == suppressableValue); for (Map.Entry<?,?> entry : value.entrySet()) { // First, serialize key; unless ignorable by key final Object keyElem = entry.getKey(); if (ignored != null && ignored.contains(keyElem)) continue; JsonSerializer<Object> keySerializer; if (keyElem == null) { keySerializer = provider.findNullKeySerializer(_keyType, _property); } else { keySerializer = _keySerializer; } // or by value; nulls often suppressed final Object valueElem = entry.getValue(); JsonSerializer<Object> valueSer; // And then value if (valueElem == null) { if (_suppressNulls) { continue; } valueSer = provider.getDefaultNullValueSerializer(); } else { valueSer = _valueSerializer; if (valueSer == null) { valueSer = _findSerializer(provider, valueElem); } // also may need to skip non-empty values: if (checkEmpty) { if (valueSer.isEmpty(provider, valueElem)) { continue; } } else if (suppressableValue != null) { if (suppressableValue.equals(valueElem)) { continue; } } } // and with that, ask filter to handle it prop.reset(keyElem, valueElem, keySerializer, valueSer); try { filter.serializeAsField(bean, gen, provider, prop); } catch (Exception e) { wrapAndThrow(provider, e, value, String.valueOf(keyElem)); } } } /* /********************************************************** /* Schema related functionality /********************************************************** */ @Override public JsonNode getSchema(SerializerProvider provider, Type typeHint) { // even though it's possible to statically determine the "value" type of the map, // there's no way to statically determine the keys, so the "Entries" can't be determined. return createSchemaNode("object", true); } @Override public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException { JsonMapFormatVisitor v2 = visitor.expectMapFormat(typeHint); if (v2 != null) { v2.keyFormat(_keySerializer, _keyType); JsonSerializer<?> valueSer = _valueSerializer; if (valueSer == null) { valueSer = _findAndAddDynamic(_dynamicValueSerializers, _valueType, visitor.getProvider()); } v2.valueFormat(valueSer, _valueType); } } /* /********************************************************** /* Internal helper methods /********************************************************** */ protected final JsonSerializer<Object> _findAndAddDynamic(PropertySerializerMap map, Class<?> type, SerializerProvider provider) throws JsonMappingException { PropertySerializerMap.SerializerAndMapResult result = map.findAndAddSecondarySerializer(type, provider, _property); // did we get a new map of serializers? If so, start using it if (map != result.map) { _dynamicValueSerializers = result.map; } return result.serializer; } protected final JsonSerializer<Object> _findAndAddDynamic(PropertySerializerMap map, JavaType type, SerializerProvider provider) throws JsonMappingException { PropertySerializerMap.SerializerAndMapResult result = map.findAndAddSecondarySerializer(type, provider, _property); if (map != result.map) { _dynamicValueSerializers = result.map; } return result.serializer; } protected Map<?,?> _orderEntries(Map<?,?> input, JsonGenerator gen, SerializerProvider provider) throws IOException { // minor optimization: may already be sorted? if (input instanceof SortedMap<?,?>) { return input; } // [databind#1411]: TreeMap does not like null key... (although note that // check above should prevent this code from being called in that case) // [databind#153]: but, apparently, some custom Maps do manage hit this // problem. if (_hasNullKey(input)) { TreeMap<Object,Object> result = new TreeMap<Object,Object>(); for (Map.Entry<?,?> entry : input.entrySet()) { Object key = entry.getKey(); if (key == null) { _writeNullKeyedEntry(gen, provider, entry.getValue()); continue; } result.put(key, entry.getValue()); } return result; } return new TreeMap<Object,Object>(input); }
Since:2.8.7
/** * @since 2.8.7 */
protected boolean _hasNullKey(Map<?,?> input) { // 19-Feb-2017, tatu: As per [databind#1513] there are many cases where `null` // keys are not allowed, and even attempt to check for presence can cause // problems. Without resorting to external sorting (and internal API change), // or custom sortable Map implementation (more code) we can try black- or // white-listing (that is; either skip known problem cases; or only apply for // known good cases). // While my first instinct was to do black-listing (remove Hashtable and ConcurrentHashMap), // all in all it is probably better to just white list `HashMap` (and its sub-classes). return (input instanceof HashMap) && input.containsKey(null); } protected void _writeNullKeyedEntry(JsonGenerator gen, SerializerProvider provider, Object value) throws IOException { JsonSerializer<Object> keySerializer = provider.findNullKeySerializer(_keyType, _property); JsonSerializer<Object> valueSer; if (value == null) { if (_suppressNulls) { return; } valueSer = provider.getDefaultNullValueSerializer(); } else { valueSer = _valueSerializer; if (valueSer == null) { valueSer = _findSerializer(provider, value); } if (_suppressableValue == MARKER_FOR_EMPTY) { if (valueSer.isEmpty(provider, value)) { return; } } else if ((_suppressableValue != null) && (_suppressableValue.equals(value))) { return; } } try { keySerializer.serialize(null, gen, provider); valueSer.serialize(value, gen, provider); } catch (Exception e) { wrapAndThrow(provider, e, value, ""); } } private final JsonSerializer<Object> _findSerializer(SerializerProvider provider, Object value) throws JsonMappingException { final Class<?> cc = value.getClass(); JsonSerializer<Object> valueSer = _dynamicValueSerializers.serializerFor(cc); if (valueSer != null) { return valueSer; } if (_valueType.hasGenericTypes()) { return _findAndAddDynamic(_dynamicValueSerializers, provider.constructSpecializedType(_valueType, cc), provider); } return _findAndAddDynamic(_dynamicValueSerializers, cc, provider); } }