com.brainardphotography.gravatar.contact.PCContactLoader.java Source code

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Here is the source code for com.brainardphotography.gravatar.contact.PCContactLoader.java

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/*
 * Copyright 2012 John Brainard
 *
 * 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.brainardphotography.gravatar.contact;

import java.io.IOException;
import java.io.Reader;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class PCContactLoader implements ContactLoader {
    private static ContactLoader instance = null;

    private Gson gson;
    private JsonParser jsonParser;

    private PCContactLoader() {
        gson = new Gson();
        jsonParser = new JsonParser();
    }

    public static ContactLoader getInstance() {
        if (instance == null)
            instance = new PCContactLoader();

        return instance;
    }

    @Override
    public PCContact loadContact(Reader reader) throws IOException {
        JsonElement element = jsonParser.parse(reader);
        JsonObject object = element.getAsJsonObject();
        JsonArray entries = object.getAsJsonArray("entry");

        if (entries.size() > 0)
            return gson.fromJson(entries.get(0), PCContact.class);

        return null;
    }
}