org.apache.pirk.response.wideskies.ResponseDeserializer.java Source code

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Here is the source code for org.apache.pirk.response.wideskies.ResponseDeserializer.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.pirk.response.wideskies;

import com.google.gson.Gson;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.reflect.TypeToken;
import org.apache.pirk.query.wideskies.QueryDeserializer;
import org.apache.pirk.query.wideskies.QueryInfo;

import java.lang.reflect.Type;
import java.math.BigInteger;
import java.util.TreeMap;

/**
 * Custom deserializer for Response class for Gson.
 */
public class ResponseDeserializer implements JsonDeserializer<Response> {

    private static final Gson gson = new Gson();

    @Override
    public Response deserialize(JsonElement jsonElement, Type type,
            JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
        final JsonObject jsonObject = jsonElement.getAsJsonObject();
        long responseVersion = jsonObject.get("responseVersion").getAsLong();
        if (responseVersion != Response.responseSerialVersionUID) {
            throw new JsonParseException("\"Attempt to deserialize unsupported query version. Supported: \"\n"
                    + "          + Response.responseSerialVersionUID + \"; Received: \" + responseVersion");
        }
        QueryInfo queryInfo = QueryDeserializer.deserializeInfo(jsonObject.get("queryInfo").getAsJsonObject());
        Response response = new Response(queryInfo);
        TreeMap<Integer, BigInteger> responseElements = gson.fromJson(jsonObject.get("responseElements"),
                new TypeToken<TreeMap<Integer, BigInteger>>() {
                }.getType());
        response.setResponseElements(responseElements);
        return response;
    }
}