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/*
* Copyright (c) 2008-2014 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mongodb.util;
import com.mongodb.Bytes;
import org.bson.util.ClassMap;
import java.util.List;
/**
* Objects of type ClassMapBasedObjectSerializer are constructed to perform
* instance specific object to JSON serialization schemes.
*
* This class is not thread safe
*
* @author breinero
*/
class ClassMapBasedObjectSerializer extends AbstractObjectSerializer {
/**
* Assign a ObjectSerializer to perform a type specific serialization scheme
* @param c this object's type serves as a key in the serialization map.
* ClassMapBasedObjectSerializer uses org.bson.util.ClassMap and not only checks if 'c' is a key in the Map,
* but also walks the up superclass and interface graph of 'c' to find matches.
* This means that it is only necessary assign ObjectSerializers to base classes. @see org.bson.util.ClassMap
* @param serializer performs the serialization mapping specific to the @param key type
*/
void addObjectSerializer(Class c, ObjectSerializer serializer) {
_serializers.put(c , serializer);
}
/**
*
* @param obj the object to be serialized
* @param buf StringBuilder containing the JSON representation of the object
*/
@Override
public void serialize(Object obj, StringBuilder buf){
obj = Bytes.applyEncodingHooks( obj );
if(obj == null) {
buf.append(" null ");
return;
}
ObjectSerializer serializer = null;
List> ancestors;
ancestors = ClassMap.getAncestry(obj.getClass());
for (final Class ancestor : ancestors) {
serializer = _serializers.get(ancestor);
if (serializer != null)
break;
}
if (serializer == null && obj.getClass().isArray())
serializer = _serializers.get(Object[].class);
if (serializer == null)
throw new RuntimeException( "json can't serialize type : " + obj.getClass() );
serializer.serialize(obj, buf);
}
private ClassMap _serializers = new ClassMap();
}