ObjectIdSerializer.java

/*
 * 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()));
    }
}