package org.codehaus.jackson.map.jsontype.impl;
import java.io.IOException;
import java.util.HashMap;
import org.codehaus.jackson.*;
import org.codehaus.jackson.annotate.JsonTypeInfo;
import org.codehaus.jackson.map.BeanProperty;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.TypeDeserializer;
import org.codehaus.jackson.map.jsontype.TypeIdResolver;
import org.codehaus.jackson.type.JavaType;
/**
* @since 1.5
* @author tatus
*/
public abstract class TypeDeserializerBase extends TypeDeserializer
{
protected final TypeIdResolver _idResolver;
protected final JavaType _baseType;
protected final BeanProperty _property;
/**
* Type to use as the default implementation, if type id is
* missing or can not be resolved.
*
* @since 1.9
*/
protected final JavaType _defaultImpl;
/**
* For efficient operation we will lazily build mappings from type ids
* to actual deserializers, once needed.
*/
protected final HashMap<String,JsonDeserializer<Object>> _deserializers;
/**
* @since 1.9
*/
protected JsonDeserializer<Object> _defaultImplDeserializer;
/**
* @deprecated Since 1.9, use the constructor that takes 'defaultImpl'
*/
@Deprecated
protected TypeDeserializerBase(JavaType baseType, TypeIdResolver idRes, BeanProperty property) {
this(baseType, idRes, property, null);
}
protected TypeDeserializerBase(JavaType baseType, TypeIdResolver idRes, BeanProperty property,
Class<?> defaultImpl)
{
_baseType = baseType;
_idResolver = idRes;
_property = property;
_deserializers = new HashMap<String,JsonDeserializer<Object>>();
if (defaultImpl == null) {
_defaultImpl = null;
} else {
/* 16-Oct-2011, tatu: should call this via TypeFactory; this is
* not entirely safe... however, since Collections/Maps are
* seldom (if ever) base types, may be ok.
*/
_defaultImpl = baseType.forcedNarrowBy(defaultImpl);
}
}
@Override
public abstract JsonTypeInfo.As getTypeInclusion();
public String baseTypeName() { return _baseType.getRawClass().getName(); }
@Override
public String getPropertyName() { return null; }
@Override
public TypeIdResolver getTypeIdResolver() { return _idResolver; }
@Override
public Class<?> getDefaultImpl() {
return (_defaultImpl == null) ? null : _defaultImpl.getRawClass();
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append('[').append(getClass().getName());
sb.append("; base-type:").append(_baseType);
sb.append("; id-resolver: ").append(_idResolver);
sb.append(']');
return sb.toString();
}
/*
/**********************************************************
/* Helper methods for sub-classes
/**********************************************************
*/
protected final JsonDeserializer<Object> _findDeserializer(DeserializationContext ctxt, String typeId)
throws IOException, JsonProcessingException
{
JsonDeserializer<Object> deser;
synchronized (_deserializers) {
deser = _deserializers.get(typeId);
if (deser == null) {
JavaType type = _idResolver.typeFromId(typeId);
if (type == null) {
// As per [JACKSON-614], use the default impl if no type id available:
if (_defaultImpl == null) {
throw ctxt.unknownTypeException(_baseType, typeId);
}
deser = _findDefaultImplDeserializer(ctxt);
} else {
/* 16-Dec-2010, tatu: Since nominal type we get here has no (generic) type parameters,
* we actually now need to explicitly narrow from base type (which may have parameterization)
* using raw type.
*
* One complication, though; can not change 'type class' (simple type to container); otherwise
* we may try to narrow a SimpleType (Object.class) into MapType (Map.class), losing actual
* type in process (getting SimpleType of Map.class which will not work as expected)
*/
if (_baseType != null && _baseType.getClass() == type.getClass()) {
type = _baseType.narrowBy(type.getRawClass());
}
deser = ctxt.getDeserializerProvider().findValueDeserializer(ctxt.getConfig(), type, _property);
}
_deserializers.put(typeId, deser);
}
}
return deser;
}
protected final JsonDeserializer<Object> _findDefaultImplDeserializer(DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
if (_defaultImpl == null) {
return null;
}
synchronized (_defaultImpl) {
if (_defaultImplDeserializer == null) {
_defaultImplDeserializer = ctxt.getDeserializerProvider().findValueDeserializer(ctxt.getConfig(),
_defaultImpl, _property);
}
return _defaultImplDeserializer;
}
}
}