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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.JsonDeserializationContext;
import com.github.nmorel.gwtjackson.client.JsonDeserializer;
import com.github.nmorel.gwtjackson.client.JsonDeserializerParameters;
import com.github.nmorel.gwtjackson.client.stream.JsonReader;
import com.github.nmorel.gwtjackson.objectify.shared.KeyConstant;
import com.googlecode.objectify.Key;

public class KeyJsonDeserializer extends JsonDeserializer> {

    private static final KeyJsonDeserializer INSTANCE = new KeyJsonDeserializer();

    public static  KeyJsonDeserializer newInstance( JsonDeserializer deserializer ) {
        return INSTANCE;
    }

    public static  KeyJsonDeserializer getInstance() {
        return INSTANCE;
    }

    private KeyJsonDeserializer() {
    }

    @Override
    protected Key doDeserialize( JsonReader reader, JsonDeserializationContext ctx, JsonDeserializerParameters params ) {
        reader.beginObject();
        if ( !KeyConstant.RAW.equals( reader.nextName() ) ) {
            throw ctx.traceError( "Missing " + KeyConstant.RAW + " property.", reader );
        }
        com.google.appengine.api.datastore.Key raw = RawKeyJsonDeserializer.getInstance().deserialize( reader, ctx, params );
        reader.endObject();
        return Key.create( raw );
    }
}