package org.codehaus.jackson.map.deser;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.*;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;
import org.codehaus.jackson.map.*;
import org.codehaus.jackson.map.util.ArrayBuilders;
import org.codehaus.jackson.type.JavaType;
/**
* Basic serializer that can take Json "Object" structure and
* construct a {@link java.util.Map} instance, with typed contents.
*<p>
* 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.
*/
public class MapDeserializer
extends StdDeserializer<Map<Object,Object>>
implements ResolvableDeserializer
{
// // Configuration: typing, deserializers
final JavaType _mapType;
/**
* Key deserializer used, if not null. If null, String from json
* content is used as is.
*/
final KeyDeserializer _keyDeserializer;
/**
* Value deserializer.
*/
final JsonDeserializer<Object> _valueDeserializer;
/**
* If value instances have polymorphic type information, this
* is the type deserializer that can handle it
*/
final TypeDeserializer _valueTypeDeserializer;
// // Instance construction settings:
final Constructor<Map<Object,Object>> _defaultCtor;
/**
* 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 Creator.PropertyBased _propertyBasedCreator;
// // Any properties to ignore if seen?
protected HashSet<String> _ignorableProperties;
/*
////////////////////////////////////////////////////////////
// Life-cycle
////////////////////////////////////////////////////////////
*/
public MapDeserializer(JavaType mapType, Constructor<Map<Object,Object>> defCtor,
KeyDeserializer keyDeser, JsonDeserializer<Object> valueDeser,
TypeDeserializer valueTypeDeser)
{
super(Map.class);
_mapType = mapType;
_defaultCtor = defCtor;
_keyDeserializer = keyDeser;
_valueDeserializer = valueDeser;
_valueTypeDeserializer = valueTypeDeser;
}
/**
* Method called to add constructor and/or factory method based
* creators to be used with Map, instead of default constructor.
*/
public void setCreators(CreatorContainer creators)
{
_propertyBasedCreator = creators.propertyBasedCreator();
}
public void setIgnorableProperties(String[] ignorable)
{
_ignorableProperties = (ignorable == null || ignorable.length == 0) ?
null : ArrayBuilders.arrayToSet(ignorable);
}
/*
/////////////////////////////////////////////////////////
// Validation, post-processing
/////////////////////////////////////////////////////////
*/
/**
* Method called to finalize setup of this deserializer,
* after deserializer itself has been registered. This
* is needed to handle recursive and transitive dependencies.
*/
public void resolve(DeserializationConfig config, DeserializerProvider provider)
throws JsonMappingException
{
// just need to worry about property-based one
if (_propertyBasedCreator != null) {
// Need to / should not create separate
HashMap<JavaType, JsonDeserializer<Object>> seen = new HashMap<JavaType, JsonDeserializer<Object>>();
for (SettableBeanProperty prop : _propertyBasedCreator.properties()) {
prop.setValueDeserializer(findDeserializer(config, provider, prop.getType(), prop.getPropertyName(), seen));
}
}
}
/*
////////////////////////////////////////////////////////////
// Deserializer API
////////////////////////////////////////////////////////////
*/
@Override
public Map<Object,Object> deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
// Ok: must point to START_OBJECT, or FIELD_NAME
JsonToken t = jp.getCurrentToken();
if (t != JsonToken.START_OBJECT && t != JsonToken.FIELD_NAME) {
throw ctxt.mappingException(getMapClass());
}
if (_propertyBasedCreator != null) {
return _deserializeUsingCreator(jp, ctxt);
}
Map<Object,Object> result;
if (_defaultCtor == null) {
throw ctxt.instantiationException(getMapClass(), "No default constructor found");
}
try {
result = _defaultCtor.newInstance();
} catch (Exception e) {
throw ctxt.instantiationException(getMapClass(), e);
}
_readAndBind(jp, ctxt, result);
return result;
}
@Override
public Map<Object,Object> deserialize(JsonParser jp, DeserializationContext ctxt,
Map<Object,Object> result)
throws IOException, JsonProcessingException
{
// Ok: must point to START_OBJECT or FIELD_NAME
JsonToken t = jp.getCurrentToken();
if (t != JsonToken.START_OBJECT && t != JsonToken.FIELD_NAME) {
throw ctxt.mappingException(getMapClass());
}
_readAndBind(jp, ctxt, result);
return result;
}
@Override
public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt,
TypeDeserializer typeDeserializer)
throws IOException, JsonProcessingException
{
// In future could check current token... for now this should be enough:
return typeDeserializer.deserializeTypedFromObject(jp, ctxt);
}
/*
/////////////////////////////////////////////////////////
// Other public accessors
/////////////////////////////////////////////////////////
*/
@SuppressWarnings("unchecked")
public final Class<?> getMapClass() { return (Class<Map<Object,Object>>) _mapType.getRawClass(); }
@Override public JavaType getValueType() { return _mapType; }
/*
*************************************************
* Internal methods
*************************************************
*/
protected final void _readAndBind(JsonParser jp, DeserializationContext ctxt,
Map<Object,Object> result)
throws IOException, JsonProcessingException
{
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.START_OBJECT) {
t = jp.nextToken();
}
final KeyDeserializer keyDes = _keyDeserializer;
final JsonDeserializer<Object> valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
for (; t == JsonToken.FIELD_NAME; t = jp.nextToken()) {
// Must point to field name
String fieldName = jp.getCurrentName();
Object key = (keyDes == null) ? fieldName : keyDes.deserializeKey(fieldName, ctxt);
// And then the value...
t = jp.nextToken();
if (_ignorableProperties != null && _ignorableProperties.contains(fieldName)) {
jp.skipChildren();
continue;
}
// Note: must handle null explicitly here; value deserializers won't
Object value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else if (typeDeser == null) {
value = valueDes.deserialize(jp, ctxt);
} else {
value = valueDes.deserializeWithType(jp, ctxt, typeDeser);
}
/* !!! 23-Dec-2008, tatu: should there be an option to verify
* that there are no duplicate field names? (and/or what
* to do, keep-first or keep-last)
*/
result.put(key, value);
}
}
@SuppressWarnings("unchecked")
public Map<Object,Object> _deserializeUsingCreator(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
final Creator.PropertyBased creator = _propertyBasedCreator;
PropertyValueBuffer buffer = creator.startBuilding(jp, ctxt);
JsonToken t = jp.getCurrentToken();
if (t == JsonToken.START_OBJECT) {
t = jp.nextToken();
}
final JsonDeserializer<Object> valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
for (; t == JsonToken.FIELD_NAME; t = jp.nextToken()) {
String propName = jp.getCurrentName();
t = jp.nextToken(); // to get to value
if (_ignorableProperties != null && _ignorableProperties.contains(propName)) {
jp.skipChildren(); // and skip it (in case of array/object)
continue;
}
// creator property?
SettableBeanProperty prop = creator.findCreatorProperty(propName);
if (prop != null) {
// Last property to set?
Object value = prop.deserialize(jp, ctxt);
if (buffer.assignParameter(prop.getCreatorIndex(), value)) {
jp.nextToken();
Map<Object,Object> result = (Map<Object,Object>)creator.build(buffer);
_readAndBind(jp, ctxt, result);
return result;
}
continue;
}
// other property? needs buffering
String fieldName = jp.getCurrentName();
Object key = (_keyDeserializer == null) ? fieldName : _keyDeserializer.deserializeKey(fieldName, ctxt);
Object value;
if (t == JsonToken.VALUE_NULL) {
value = null;
} else if (typeDeser == null) {
value = valueDes.deserialize(jp, ctxt);
} else {
value = valueDes.deserializeWithType(jp, ctxt, typeDeser);
}
buffer.bufferMapProperty(key, value);
}
// end of JSON object?
// if so, can just construct and leave...
return (Map<Object,Object>)creator.build(buffer);
}
}