Java tutorial
/* * Copyright (C) 2011 Benoit GUEROUT <bguerout at gmail dot com> and Yves AMSELLEM <amsellem dot yves at gmail dot com> * * 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 org.jongo.marshall.jackson.oid; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.databind.BeanProperty; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; import com.fasterxml.jackson.databind.ser.ContextualSerializer; import org.bson.types.ObjectId; import java.io.IOException; public class ObjectIdSerializer extends JsonSerializer<Object> implements ContextualSerializer { boolean fieldIsObjectId = false; public ObjectIdSerializer() { this(false); } public ObjectIdSerializer(boolean serializeAsObjectId) { this.fieldIsObjectId = serializeAsObjectId; } @Override public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException { if (value == null) { jgen.writeNull(); } else if (fieldIsObjectId) { jgen.writeObject(value); } else { jgen.writeObject(new ObjectId(value.toString())); } } public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException { return new ObjectIdSerializer(ObjectId.class.isAssignableFrom(property.getType().getRawClass())); } }