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Extension to support Objectify types like Ref or Key

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/*
 * Copyright 2017 Nicolas Morel
 *
 * 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.github.nmorel.gwtjackson.objectify.client;

import com.github.nmorel.gwtjackson.client.JsonSerializationContext;
import com.github.nmorel.gwtjackson.client.JsonSerializer;
import com.github.nmorel.gwtjackson.client.JsonSerializerParameters;
import com.github.nmorel.gwtjackson.client.stream.JsonWriter;
import com.github.nmorel.gwtjackson.objectify.shared.RefConstant;
import com.googlecode.objectify.Ref;

public class RefJsonSerializer extends JsonSerializer> {

    public static  RefJsonSerializer newInstance( JsonSerializer serializer ) {
        return new RefJsonSerializer( serializer );
    }

    private final JsonSerializer serializer;

    private RefJsonSerializer( JsonSerializer serializer ) {
        if ( null == serializer ) {
            throw new IllegalArgumentException( "serializer cannot be null" );
        }
        this.serializer = serializer;
    }

    @Override
    protected void doSerialize( JsonWriter writer, Ref ref, JsonSerializationContext ctx, JsonSerializerParameters params ) {
        writer.beginObject();
        writer.name( RefConstant.KEY );
        KeyJsonSerializer.getInstance().serialize( writer, ref.getKey(), ctx, params );
        writer.name( RefConstant.VALUE );
        serializer.serialize( writer, ref.getValue(), ctx, params );
        writer.endObject();
    }
}