package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.deser.*;
import com.fasterxml.jackson.databind.deser.impl.PropertyBasedCreator;
import com.fasterxml.jackson.databind.deser.impl.PropertyValueBuffer;
import com.fasterxml.jackson.databind.deser.impl.ReadableObjectId.Referring;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.util.ArrayBuilders;
/**
* Basic serializer that can take JSON "Object" structure and
* construct a {@link java.util.Map} instance, with typed contents.
*
* Note: for untyped content (one indicated by passing Object.class
* as the type), {@link UntypedObjectDeserializer} is used instead.
* It can also construct {@link java.util.Map}s, but not with specific
* POJO types, only other containers and primitives/wrappers.
*/
@JacksonStdImpl
public class MapDeserializer
extends ContainerDeserializerBase>
implements ContextualDeserializer, ResolvableDeserializer
{
private static final long serialVersionUID = 1L;
// // Configuration: typing, deserializers
/**
* Key deserializer to use; either passed via constructor
* (when indicated by annotations), or resolved when
* {@link #resolve} is called;
*/
protected final KeyDeserializer _keyDeserializer;
/**
* Flag set to indicate that the key type is
* {@link java.lang.String} (or {@link java.lang.Object}, for
* which String is acceptable), and that the
* default Jackson key deserializer would be used.
* If both are true, can optimize handling.
*/
protected boolean _standardStringKey;
/**
* Value deserializer.
*/
protected final JsonDeserializer _valueDeserializer;
/**
* If value instances have polymorphic type information, this
* is the type deserializer that can handle it
*/
protected final TypeDeserializer _valueTypeDeserializer;
// // Instance construction settings:
protected final ValueInstantiator _valueInstantiator;
/**
* Deserializer that is used iff delegate-based creator is
* to be used for deserializing from JSON Object.
*/
protected JsonDeserializer _delegateDeserializer;
/**
* If the Map is to be instantiated using non-default constructor
* or factory method
* that takes one or more named properties as argument(s),
* this creator is used for instantiation.
*/
protected PropertyBasedCreator _propertyBasedCreator;
protected final boolean _hasDefaultCreator;
// // Any properties to ignore if seen?
protected Set _ignorableProperties;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public MapDeserializer(JavaType mapType, ValueInstantiator valueInstantiator,
KeyDeserializer keyDeser, JsonDeserializer valueDeser,
TypeDeserializer valueTypeDeser)
{
super(mapType, null, null);
_keyDeserializer = keyDeser;
_valueDeserializer = valueDeser;
_valueTypeDeserializer = valueTypeDeser;
_valueInstantiator = valueInstantiator;
_hasDefaultCreator = valueInstantiator.canCreateUsingDefault();
_delegateDeserializer = null;
_propertyBasedCreator = null;
_standardStringKey = _isStdKeyDeser(mapType, keyDeser);
}
/**
* Copy-constructor that can be used by sub-classes to allow
* copy-on-write styling copying of settings of an existing instance.
*/
protected MapDeserializer(MapDeserializer src)
{
super(src);
_keyDeserializer = src._keyDeserializer;
_valueDeserializer = src._valueDeserializer;
_valueTypeDeserializer = src._valueTypeDeserializer;
_valueInstantiator = src._valueInstantiator;
_propertyBasedCreator = src._propertyBasedCreator;
_delegateDeserializer = src._delegateDeserializer;
_hasDefaultCreator = src._hasDefaultCreator;
// should we make a copy here?
_ignorableProperties = src._ignorableProperties;
_standardStringKey = src._standardStringKey;
}
protected MapDeserializer(MapDeserializer src,
KeyDeserializer keyDeser, JsonDeserializer valueDeser,
TypeDeserializer valueTypeDeser,
NullValueProvider nuller,
Set ignorable)
{
super(src, nuller, src._unwrapSingle);
_keyDeserializer = keyDeser;
_valueDeserializer = valueDeser;
_valueTypeDeserializer = valueTypeDeser;
_valueInstantiator = src._valueInstantiator;
_propertyBasedCreator = src._propertyBasedCreator;
_delegateDeserializer = src._delegateDeserializer;
_hasDefaultCreator = src._hasDefaultCreator;
_ignorableProperties = ignorable;
_standardStringKey = _isStdKeyDeser(_containerType, keyDeser);
}
/**
* Fluent factory method used to create a copy with slightly
* different settings. When sub-classing, MUST be overridden.
*/
@SuppressWarnings("unchecked")
protected MapDeserializer withResolved(KeyDeserializer keyDeser,
TypeDeserializer valueTypeDeser, JsonDeserializer valueDeser,
NullValueProvider nuller,
Set ignorable)
{
if ((_keyDeserializer == keyDeser) && (_valueDeserializer == valueDeser)
&& (_valueTypeDeserializer == valueTypeDeser) && (_nullProvider == nuller)
&& (_ignorableProperties == ignorable)) {
return this;
}
return new MapDeserializer(this,
keyDeser, (JsonDeserializer) valueDeser, valueTypeDeser,
nuller, ignorable);
}
/**
* Helper method used to check whether we can just use the default key
* deserialization, where JSON String becomes Java String.
*/
protected final boolean _isStdKeyDeser(JavaType mapType, KeyDeserializer keyDeser)
{
if (keyDeser == null) {
return true;
}
JavaType keyType = mapType.getKeyType();
if (keyType == null) { // assumed to be Object
return true;
}
Class rawKeyType = keyType.getRawClass();
return ((rawKeyType == String.class || rawKeyType == Object.class)
&& isDefaultKeyDeserializer(keyDeser));
}
public void setIgnorableProperties(String[] ignorable) {
_ignorableProperties = (ignorable == null || ignorable.length == 0) ?
null : ArrayBuilders.arrayToSet(ignorable);
}
public void setIgnorableProperties(Set ignorable) {
_ignorableProperties = (ignorable == null || ignorable.size() == 0) ?
null : ignorable;
}
/*
/**********************************************************
/* Validation, post-processing (ResolvableDeserializer)
/**********************************************************
*/
@Override
public void resolve(DeserializationContext ctxt) throws JsonMappingException
{
// May need to resolve types for delegate- and/or property-based creators:
if (_valueInstantiator.canCreateUsingDelegate()) {
JavaType delegateType = _valueInstantiator.getDelegateType(ctxt.getConfig());
if (delegateType == null) {
ctxt.reportBadDefinition(_containerType, String.format(
"Invalid delegate-creator definition for %s: value instantiator (%s) returned true for 'canCreateUsingDelegate()', but null for 'getDelegateType()'",
_containerType,
_valueInstantiator.getClass().getName()));
}
// Theoretically should be able to get CreatorProperty for delegate
// parameter to pass; but things get tricky because DelegateCreator
// may contain injectable values. So, for now, let's pass nothing.
_delegateDeserializer = findDeserializer(ctxt, delegateType, null);
} else if (_valueInstantiator.canCreateUsingArrayDelegate()) {
JavaType delegateType = _valueInstantiator.getArrayDelegateType(ctxt.getConfig());
if (delegateType == null) {
ctxt.reportBadDefinition(_containerType, String.format(
"Invalid delegate-creator definition for %s: value instantiator (%s) returned true for 'canCreateUsingArrayDelegate()', but null for 'getArrayDelegateType()'",
_containerType,
_valueInstantiator.getClass().getName()));
}
_delegateDeserializer = findDeserializer(ctxt, delegateType, null);
}
if (_valueInstantiator.canCreateFromObjectWith()) {
SettableBeanProperty[] creatorProps = _valueInstantiator.getFromObjectArguments(ctxt.getConfig());
_propertyBasedCreator = PropertyBasedCreator.construct(ctxt, _valueInstantiator, creatorProps,
ctxt.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES));
}
_standardStringKey = _isStdKeyDeser(_containerType, _keyDeserializer);
}
/**
* Method called to finalize setup of this deserializer,
* when it is known for which property deserializer is needed for.
*/
@Override
public JsonDeserializer createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException
{
KeyDeserializer keyDeser = _keyDeserializer;
if (keyDeser == null) {
keyDeser = ctxt.findKeyDeserializer(_containerType.getKeyType(), property);
} else {
if (keyDeser instanceof ContextualKeyDeserializer) {
keyDeser = ((ContextualKeyDeserializer) keyDeser).createContextual(ctxt, property);
}
}
JsonDeserializer valueDeser = _valueDeserializer;
// [databind#125]: May have a content converter
if (property != null) {
valueDeser = findConvertingContentDeserializer(ctxt, property, valueDeser);
}
final JavaType vt = _containerType.getContentType();
if (valueDeser == null) {
valueDeser = ctxt.findContextualValueDeserializer(vt, property);
} else { // if directly assigned, probably not yet contextual, so:
valueDeser = ctxt.handleSecondaryContextualization(valueDeser, property, vt);
}
TypeDeserializer vtd = _valueTypeDeserializer;
if (vtd != null) {
vtd = vtd.forProperty(property);
}
Set ignored = _ignorableProperties;
AnnotationIntrospector intr = ctxt.getAnnotationIntrospector();
if (_neitherNull(intr, property)) {
AnnotatedMember member = property.getMember();
if (member != null) {
JsonIgnoreProperties.Value ignorals = intr.findPropertyIgnorals(member);
if (ignorals != null) {
Set ignoresToAdd = ignorals.findIgnoredForDeserialization();
if (!ignoresToAdd.isEmpty()) {
ignored = (ignored == null) ? new HashSet() : new HashSet(ignored);
for (String str : ignoresToAdd) {
ignored.add(str);
}
}
}
}
}
return withResolved(keyDeser, vtd, valueDeser,
findContentNullProvider(ctxt, property, valueDeser), ignored);
}
/*
/**********************************************************
/* ContainerDeserializerBase API
/**********************************************************
*/
@Override
public JsonDeserializer getContentDeserializer() {
return _valueDeserializer;
}
@Override
public ValueInstantiator getValueInstantiator() {
return _valueInstantiator;
}
/*
/**********************************************************
/* JsonDeserializer API
/**********************************************************
*/
/**
* Turns out that these are expensive enough to create so that caching
* does make sense.
*
* IMPORTANT: but, note, that instances CAN NOT BE CACHED if there is
* a value type deserializer; this caused an issue with 2.4.4 of
* JAXB Annotations (failing a test).
* It is also possible that some other settings could make deserializers
* un-cacheable; but on the other hand, caching can make a big positive
* difference with performance... so it's a hard choice.
*
* @since 2.4.4
*/
@Override
public boolean isCachable() {
// As per [databind#735], existence of value or key deserializer (only passed
// if annotated to use non-standard one) should also prevent caching.
return (_valueDeserializer == null)
&& (_keyDeserializer == null)
&& (_valueTypeDeserializer == null)
&& (_ignorableProperties == null);
}
@Override
@SuppressWarnings("unchecked")
public Map deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
{
if (_propertyBasedCreator != null) {
return _deserializeUsingCreator(p, ctxt);
}
if (_delegateDeserializer != null) {
return (Map) _valueInstantiator.createUsingDelegate(ctxt,
_delegateDeserializer.deserialize(p, ctxt));
}
if (!_hasDefaultCreator) {
return (Map ) ctxt.handleMissingInstantiator(getMapClass(),
getValueInstantiator(), p,
"no default constructor found");
}
// Ok: must point to START_OBJECT, FIELD_NAME or END_OBJECT
JsonToken t = p.getCurrentToken();
if (t != JsonToken.START_OBJECT && t != JsonToken.FIELD_NAME && t != JsonToken.END_OBJECT) {
// (empty) String may be ok however; or single-String-arg ctor
if (t == JsonToken.VALUE_STRING) {
return (Map) _valueInstantiator.createFromString(ctxt, p.getText());
}
// slightly redundant (since String was passed above), but also handles empty array case:
return _deserializeFromEmpty(p, ctxt);
}
final Map result = (Map) _valueInstantiator.createUsingDefault(ctxt);
if (_standardStringKey) {
_readAndBindStringKeyMap(p, ctxt, result);
return result;
}
_readAndBind(p, ctxt, result);
return result;
}
@SuppressWarnings("unchecked")
@Override
public Map deserialize(JsonParser p, DeserializationContext ctxt,
Map result)
throws IOException
{
// [databind#631]: Assign current value, to be accessible by custom deserializers
p.setCurrentValue(result);
// Ok: must point to START_OBJECT or FIELD_NAME
JsonToken t = p.getCurrentToken();
if (t != JsonToken.START_OBJECT && t != JsonToken.FIELD_NAME) {
return (Map) ctxt.handleUnexpectedToken(getMapClass(), p);
}
// 21-Apr-2017, tatu: Need separate methods to do proper merging
if (_standardStringKey) {
_readAndUpdateStringKeyMap(p, ctxt, result);
return result;
}
_readAndUpdate(p, ctxt, result);
return result;
}
@Override
public Object deserializeWithType(JsonParser p, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException
{
// In future could check current token... for now this should be enough:
return typeDeserializer.deserializeTypedFromObject(p, ctxt);
}
/*
/**********************************************************
/* Other public accessors
/**********************************************************
*/
@SuppressWarnings("unchecked")
public final Class getMapClass() { return (Class>) _containerType.getRawClass(); }
@Override public JavaType getValueType() { return _containerType; }
/*
/**********************************************************
/* Internal methods, non-merging deserialization
/**********************************************************
*/
protected final void _readAndBind(JsonParser p, DeserializationContext ctxt,
Map result) throws IOException
{
final KeyDeserializer keyDes = _keyDeserializer;
final JsonDeserializer valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
MapReferringAccumulator referringAccumulator = null;
boolean useObjectId = valueDes.getObjectIdReader() != null;
if (useObjectId) {
referringAccumulator = new MapReferringAccumulator(_containerType.getContentType().getRawClass(),
result);
}
String keyStr;
if (p.isExpectedStartObjectToken()) {
keyStr = p.nextFieldName();
} else {
JsonToken t = p.getCurrentToken();
if (t != JsonToken.FIELD_NAME) {
if (t == JsonToken.END_OBJECT) {
return;
}
ctxt.reportWrongTokenException(this, JsonToken.FIELD_NAME, null);
}
keyStr = p.getCurrentName();
}
for (; keyStr != null; keyStr = p.nextFieldName()) {
Object key = keyDes.deserializeKey(keyStr, ctxt);
// And then the value...
JsonToken t = p.nextToken();
if (_ignorableProperties != null && _ignorableProperties.contains(keyStr)) {
p.skipChildren();
continue;
}
try {
// Note: must handle null explicitly here; value deserializers won't
Object value;
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
value = _nullProvider.getNullValue(ctxt);
} else if (typeDeser == null) {
value = valueDes.deserialize(p, ctxt);
} else {
value = valueDes.deserializeWithType(p, ctxt, typeDeser);
}
if (useObjectId) {
referringAccumulator.put(key, value);
} else {
result.put(key, value);
}
} catch (UnresolvedForwardReference reference) {
handleUnresolvedReference(ctxt, referringAccumulator, key, reference);
} catch (Exception e) {
wrapAndThrow(e, result, keyStr);
}
}
}
/**
* Optimized method used when keys can be deserialized as plain old
* {@link java.lang.String}s, and there is no custom deserialized
* specified.
*/
protected final void _readAndBindStringKeyMap(JsonParser p, DeserializationContext ctxt,
Map result) throws IOException
{
final JsonDeserializer valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
MapReferringAccumulator referringAccumulator = null;
boolean useObjectId = (valueDes.getObjectIdReader() != null);
if (useObjectId) {
referringAccumulator = new MapReferringAccumulator(_containerType.getContentType().getRawClass(), result);
}
String key;
if (p.isExpectedStartObjectToken()) {
key = p.nextFieldName();
} else {
JsonToken t = p.getCurrentToken();
if (t == JsonToken.END_OBJECT) {
return;
}
if (t != JsonToken.FIELD_NAME) {
ctxt.reportWrongTokenException(this, JsonToken.FIELD_NAME, null);
}
key = p.getCurrentName();
}
for (; key != null; key = p.nextFieldName()) {
JsonToken t = p.nextToken();
if (_ignorableProperties != null && _ignorableProperties.contains(key)) {
p.skipChildren();
continue;
}
try {
// Note: must handle null explicitly here; value deserializers won't
Object value;
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
value = _nullProvider.getNullValue(ctxt);
} else if (typeDeser == null) {
value = valueDes.deserialize(p, ctxt);
} else {
value = valueDes.deserializeWithType(p, ctxt, typeDeser);
}
if (useObjectId) {
referringAccumulator.put(key, value);
} else {
result.put(key, value);
}
} catch (UnresolvedForwardReference reference) {
handleUnresolvedReference(ctxt, referringAccumulator, key, reference);
} catch (Exception e) {
wrapAndThrow(e, result, key);
}
}
// 23-Mar-2015, tatu: TODO: verify we got END_OBJECT?
}
@SuppressWarnings("unchecked")
public Map _deserializeUsingCreator(JsonParser p, DeserializationContext ctxt) throws IOException
{
final PropertyBasedCreator creator = _propertyBasedCreator;
// null -> no ObjectIdReader for Maps (yet?)
PropertyValueBuffer buffer = creator.startBuilding(p, ctxt, null);
final JsonDeserializer valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
String key;
if (p.isExpectedStartObjectToken()) {
key = p.nextFieldName();
} else if (p.hasToken(JsonToken.FIELD_NAME)) {
key = p.getCurrentName();
} else {
key = null;
}
for (; key != null; key = p.nextFieldName()) {
JsonToken t = p.nextToken(); // to get to value
if (_ignorableProperties != null && _ignorableProperties.contains(key)) {
p.skipChildren(); // and skip it (in case of array/object)
continue;
}
// creator property?
SettableBeanProperty prop = creator.findCreatorProperty(key);
if (prop != null) {
// Last property to set?
if (buffer.assignParameter(prop, prop.deserialize(p, ctxt))) {
p.nextToken(); // from value to END_OBJECT or FIELD_NAME
Map result;
try {
result = (Map)creator.build(ctxt, buffer);
} catch (Exception e) {
return wrapAndThrow(e, _containerType.getRawClass(), key);
}
_readAndBind(p, ctxt, result);
return result;
}
continue;
}
// other property? needs buffering
Object actualKey = _keyDeserializer.deserializeKey(key, ctxt);
Object value;
try {
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
value = _nullProvider.getNullValue(ctxt);
} else if (typeDeser == null) {
value = valueDes.deserialize(p, ctxt);
} else {
value = valueDes.deserializeWithType(p, ctxt, typeDeser);
}
} catch (Exception e) {
wrapAndThrow(e, _containerType.getRawClass(), key);
return null;
}
buffer.bufferMapProperty(actualKey, value);
}
// end of JSON object?
// if so, can just construct and leave...
try {
return (Map)creator.build(ctxt, buffer);
} catch (Exception e) {
wrapAndThrow(e, _containerType.getRawClass(), key);
return null;
}
}
/*
/**********************************************************
/* Internal methods, non-merging deserialization
/**********************************************************
*/
/**
* @since 2.9
*/
protected final void _readAndUpdate(JsonParser p, DeserializationContext ctxt,
Map result) throws IOException
{
final KeyDeserializer keyDes = _keyDeserializer;
final JsonDeserializer valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
// Note: assumption is that Object Id handling can't really work with merging
// and thereby we can (and should) just drop that part
String keyStr;
if (p.isExpectedStartObjectToken()) {
keyStr = p.nextFieldName();
} else {
JsonToken t = p.getCurrentToken();
if (t == JsonToken.END_OBJECT) {
return;
}
if (t != JsonToken.FIELD_NAME) {
ctxt.reportWrongTokenException(this, JsonToken.FIELD_NAME, null);
}
keyStr = p.getCurrentName();
}
for (; keyStr != null; keyStr = p.nextFieldName()) {
Object key = keyDes.deserializeKey(keyStr, ctxt);
// And then the value...
JsonToken t = p.nextToken();
if (_ignorableProperties != null && _ignorableProperties.contains(keyStr)) {
p.skipChildren();
continue;
}
try {
// Note: must handle null explicitly here, can't merge etc
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
result.put(key, _nullProvider.getNullValue(ctxt));
continue;
}
Object old = result.get(key);
Object value;
if (old != null) {
value = valueDes.deserialize(p, ctxt, old);
} else if (typeDeser == null) {
value = valueDes.deserialize(p, ctxt);
} else {
value = valueDes.deserializeWithType(p, ctxt, typeDeser);
}
if (value != old) {
result.put(key, value);
}
} catch (Exception e) {
wrapAndThrow(e, result, keyStr);
}
}
}
/**
* Optimized method used when keys can be deserialized as plain old
* {@link java.lang.String}s, and there is no custom deserialized
* specified.
*
* @since 2.9
*/
protected final void _readAndUpdateStringKeyMap(JsonParser p, DeserializationContext ctxt,
Map result) throws IOException
{
final JsonDeserializer valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
// Note: assumption is that Object Id handling can't really work with merging
// and thereby we can (and should) just drop that part
String key;
if (p.isExpectedStartObjectToken()) {
key = p.nextFieldName();
} else {
JsonToken t = p.getCurrentToken();
if (t == JsonToken.END_OBJECT) {
return;
}
if (t != JsonToken.FIELD_NAME) {
ctxt.reportWrongTokenException(this, JsonToken.FIELD_NAME, null);
}
key = p.getCurrentName();
}
for (; key != null; key = p.nextFieldName()) {
JsonToken t = p.nextToken();
if (_ignorableProperties != null && _ignorableProperties.contains(key)) {
p.skipChildren();
continue;
}
try {
// Note: must handle null explicitly here, can't merge etc
if (t == JsonToken.VALUE_NULL) {
if (_skipNullValues) {
continue;
}
result.put(key, _nullProvider.getNullValue(ctxt));
continue;
}
Object old = result.get(key);
Object value;
if (old != null) {
value = valueDes.deserialize(p, ctxt, old);
} else if (typeDeser == null) {
value = valueDes.deserialize(p, ctxt);
} else {
value = valueDes.deserializeWithType(p, ctxt, typeDeser);
}
if (value != old) {
result.put(key, value);
}
} catch (Exception e) {
wrapAndThrow(e, result, key);
}
}
}
/*
/**********************************************************
/* Internal methods, other
/**********************************************************
*/
private void handleUnresolvedReference(DeserializationContext ctxt,
MapReferringAccumulator accumulator,
Object key, UnresolvedForwardReference reference)
throws JsonMappingException
{
if (accumulator == null) {
ctxt.reportInputMismatch(this,
"Unresolved forward reference but no identity info: "+reference);
}
Referring referring = accumulator.handleUnresolvedReference(reference, key);
reference.getRoid().appendReferring(referring);
}
private final static class MapReferringAccumulator {
private final Class _valueType;
private Map _result;
/**
* A list of {@link MapReferring} to maintain ordering.
*/
private List _accumulator = new ArrayList();
public MapReferringAccumulator(Class valueType, Map result) {
_valueType = valueType;
_result = result;
}
public void put(Object key, Object value)
{
if (_accumulator.isEmpty()) {
_result.put(key, value);
} else {
MapReferring ref = _accumulator.get(_accumulator.size() - 1);
ref.next.put(key, value);
}
}
public Referring handleUnresolvedReference(UnresolvedForwardReference reference, Object key)
{
MapReferring id = new MapReferring(this, reference, _valueType, key);
_accumulator.add(id);
return id;
}
public void resolveForwardReference(Object id, Object value) throws IOException
{
Iterator iterator = _accumulator.iterator();
// Resolve ordering after resolution of an id. This means either:
// 1- adding to the result map in case of the first unresolved id.
// 2- merge the content of the resolved id with its previous unresolved id.
Map previous = _result;
while (iterator.hasNext()) {
MapReferring ref = iterator.next();
if (ref.hasId(id)) {
iterator.remove();
previous.put(ref.key, value);
previous.putAll(ref.next);
return;
}
previous = ref.next;
}
throw new IllegalArgumentException("Trying to resolve a forward reference with id [" + id
+ "] that wasn't previously seen as unresolved.");
}
}
/**
* Helper class to maintain processing order of value.
* The resolved object associated with {@link #key} comes before the values in
* {@link #next}.
*/
static class MapReferring extends Referring {
private final MapReferringAccumulator _parent;
public final Map next = new LinkedHashMap();
public final Object key;
MapReferring(MapReferringAccumulator parent, UnresolvedForwardReference ref,
Class valueType, Object key)
{
super(ref, valueType);
_parent = parent;
this.key = key;
}
@Override
public void handleResolvedForwardReference(Object id, Object value) throws IOException {
_parent.resolveForwardReference(id, value);
}
}
}
