package com.fasterxml.jackson.databind.deser.std;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
/**
* Deserializer for {@link EnumMap} values.
*
* Note: casting within this class is all messed up -- just could not figure out a way
* to properly deal with recursive definition of "EnumMap<K extends Enum<K>, V>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public class EnumMapDeserializer
extends ContainerDeserializerBase>
implements ContextualDeserializer
{
private static final long serialVersionUID = 1;
protected final JavaType _mapType;
protected final Class _enumClass;
protected KeyDeserializer _keyDeserializer;
protected JsonDeserializer _valueDeserializer;
/**
* If value instances have polymorphic type information, this
* is the type deserializer that can handle it
*/
protected final TypeDeserializer _valueTypeDeserializer;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public EnumMapDeserializer(JavaType mapType, KeyDeserializer keyDeserializer, JsonDeserializer valueDeser, TypeDeserializer valueTypeDeser)
{
super(mapType);
_mapType = mapType;
_enumClass = mapType.getKeyType().getRawClass();
_keyDeserializer = keyDeserializer;
_valueDeserializer = (JsonDeserializer) valueDeser;
_valueTypeDeserializer = valueTypeDeser;
}
public EnumMapDeserializer withResolved(KeyDeserializer keyDeserializer, JsonDeserializer valueDeserializer, TypeDeserializer valueTypeDeser)
{
if ((keyDeserializer == _keyDeserializer) && (valueDeserializer == _valueDeserializer) && (valueTypeDeser == _valueTypeDeserializer)) {
return this;
}
return new EnumMapDeserializer(_mapType, keyDeserializer, valueDeserializer, _valueTypeDeserializer);
}
/**
* 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
{
// note: instead of finding key deserializer, with enums we actually
// work with regular deserializers (less code duplication; but not
// quite as clean as it ought to be)
KeyDeserializer kd = _keyDeserializer;
if (kd == null) {
kd = ctxt.findKeyDeserializer(_mapType.getKeyType(), property);
}
JsonDeserializer vd = _valueDeserializer;
final JavaType vt = _mapType.getContentType();
if (vd == null) {
vd = ctxt.findContextualValueDeserializer(vt, property);
} else { // if directly assigned, probably not yet contextual, so:
vd = ctxt.handleSecondaryContextualization(vd, property, vt);
}
TypeDeserializer vtd = _valueTypeDeserializer;
if (vtd != null) {
vtd = vtd.forProperty(property);
}
return withResolved(kd, vd, vtd);
}
/**
* Because of costs associated with constructing Enum resolvers,
* let's cache instances by default.
*/
@Override
public boolean isCachable() {
// Important: do NOT cache if polymorphic values
return (_valueDeserializer == null)
&& (_keyDeserializer == null)
&& (_valueTypeDeserializer == null);
}
/*
/**********************************************************
/* ContainerDeserializerBase API
/**********************************************************
*/
@Override
public JavaType getContentType() {
return _mapType.getContentType();
}
@Override
public JsonDeserializer getContentDeserializer() {
return _valueDeserializer;
}
/*
/**********************************************************
/* Actual deserialization
/**********************************************************
*/
@Override
public EnumMap deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException
{
// Ok: must point to START_OBJECT
if (p.getCurrentToken() != JsonToken.START_OBJECT) {
return _deserializeFromEmpty(p, ctxt);
}
EnumMap result = constructMap();
final JsonDeserializer valueDes = _valueDeserializer;
final TypeDeserializer typeDeser = _valueTypeDeserializer;
while ((p.nextToken()) == JsonToken.FIELD_NAME) {
String keyName = p.getCurrentName(); // just for error message
// but we need to let key deserializer handle it separately, nonetheless
Enum key = (Enum) _keyDeserializer.deserializeKey(keyName, ctxt);
if (key == null) {
if (!ctxt.isEnabled(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)) {
return (EnumMap) ctxt.handleWeirdStringValue(_enumClass, keyName,
"value not one of declared Enum instance names for %s",
_mapType.getKeyType());
}
/* 24-Mar-2012, tatu: Null won't work as a key anyway, so let's
* just skip the entry then. But we must skip the value as well, if so.
*/
p.nextToken();
p.skipChildren();
continue;
}
// And then the value...
JsonToken t = p.nextToken();
/* note: MUST check for nulls separately: deserializers will
* not handle them (and maybe fail or return bogus data)
*/
Object value;
try {
if (t == JsonToken.VALUE_NULL) {
value = valueDes.getNullValue(ctxt);
} else if (typeDeser == null) {
value = valueDes.deserialize(p, ctxt);
} else {
value = valueDes.deserializeWithType(p, ctxt, typeDeser);
}
} catch (Exception e) {
wrapAndThrow(e, result, keyName);
return null;
}
result.put(key, value);
}
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);
}
protected EnumMap constructMap() {
return new EnumMap(_enumClass);
}
}
