com.cloudcontrolled.api.client.json.JsonDeserializer.java Source code

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Here is the source code for com.cloudcontrolled.api.client.json.JsonDeserializer.java

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/*
 * Copyright 2012 Denis Neuling 
 * 
 * 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.cloudcontrolled.api.client.json;

import com.cloudcontrolled.api.client.exception.SerializationException;
import com.cloudcontrolled.api.client.util.StandardizationUtil;
import com.cloudcontrolled.api.response.Response;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonSyntaxException;

/**
 * <p>
 * JsonDeserializer class.
 * </p>
 *
 * @author Denis Neuling (denisneuling@gmail.com)
 *
 */
public class JsonDeserializer {

    protected Gson gson;

    /**
     * <p>
     * Constructor for JsonDeserializer.
     * </p>
     */
    public JsonDeserializer() {
        initializeGson();
    }

    /**
     * 
     */
    private void initializeGson() {
        gson = new GsonBuilder().setExclusionStrategies(new ExclusionStrategy() {
            public boolean shouldSkipField(FieldAttributes fieldAttributes) {
                if (fieldAttributes.getName().equalsIgnoreCase("serialVersionUUID")) {
                    return true;
                }
                return false;
            }

            public boolean shouldSkipClass(Class<?> arg0) {
                return false;
            }
        }).create();
    }

    /**
     * <p>
     * fromJSON.
     * </p>
     *
     * @param response
     *            a {@link java.lang.String} object.
     * @param target
     *            a {@link com.cloudcontrolled.api.response.Response} object.
     * @param <T>
     *            a T object.
     * @return a {@link com.cloudcontrolled.api.response.Response} object.
     */
    @SuppressWarnings("unchecked")
    public <T> Response<T> fromJSON(String response, Response<T> target) {
        try {
            response = StandardizationUtil.getJSONStandardizer(target).normalize(response);
        } catch (Exception e) {
            throw new SerializationException(e);
        }

        try {
            Response<T> fromJson = gson.fromJson(response, target.getClass());
            if (fromJson == null) {
                fromJson = target;
            }
            return fromJson;
        } catch (JsonSyntaxException jse) {
            throw new SerializationException(jse);
        }
    }
}