com.googleapis.ajax.services.impl.LoadFeedQueryImpl.java Source code

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Here is the source code for com.googleapis.ajax.services.impl.LoadFeedQueryImpl.java

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/*
 * Copyright 2010 Nabeel Mukhtar 
 * 
 * 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.googleapis.ajax.services.impl;

import java.io.InputStream;
import java.io.InputStreamReader;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.googleapis.ajax.schema.LoadFeedResult;
import com.googleapis.ajax.services.GoogleSearchException;
import com.googleapis.ajax.services.LoadFeedQuery;
import com.googleapis.ajax.services.constant.GoogleSearchApiUrls;
import com.googleapis.ajax.services.constant.ParameterNames;

/**
 * The Class WebSearchQueryImpl.
 */
public class LoadFeedQueryImpl extends BaseGoogleSearchApiQuery<LoadFeedResult> implements LoadFeedQuery {

    /**
     * Instantiates a new web search query impl.
     * 
     * @param applicationId the application id
     */
    public LoadFeedQueryImpl(String applicationId) {
        super(applicationId);
    }

    /* (non-Javadoc)
     * @see com.google.code.googlesearch.client.GoogleSearchQuery#reset()
     */
    @Override
    public void reset() {
        apiUrlBuilder = createGoogleSearchApiUrlBuilder(GoogleSearchApiUrls.FEED_LOAD_URL);
    }

    @Override
    public LoadFeedQuery withHistory() {
        apiUrlBuilder.withParameter(ParameterNames.SCORING, "h");
        return this;
    }

    @Override
    public LoadFeedQuery withNumber(int number) {
        apiUrlBuilder.withParameter(ParameterNames.NUM, String.valueOf(number));
        return this;
    }

    /* (non-Javadoc)
     * @see com.google.code.googlesearch.client.impl.BaseGoogleSearchApiQuery#unmarshall(com.google.gson.JsonElement)
     */
    @Override
    protected LoadFeedResult unmarshall(JsonElement object) {
        Gson gson = getGsonBuilder().create();
        return gson.fromJson(object, LoadFeedResult.class);
    }

    @Override
    public LoadFeedResult singleResult() {
        InputStream jsonContent = null;
        try {
            jsonContent = callApiGet(apiUrlBuilder.buildUrl());
            JsonElement response = parser.parse(new InputStreamReader(jsonContent, UTF_8_CHAR_SET));
            if (response.isJsonObject()) {
                JsonObject json = response.getAsJsonObject();
                int status = json.get("responseStatus").getAsInt();
                if (status != 200) {
                    throw new GoogleSearchException(json.get("responseDetails").getAsString());
                }
                JsonElement data = json.get("responseData");
                if (data != null) {
                    return unmarshall(data.getAsJsonObject().get("feed"));
                }
            }
            throw new GoogleSearchException("Unknown content found in response:" + response.toString());
        } catch (Exception e) {
            throw new GoogleSearchException(e);
        } finally {
            closeStream(jsonContent);
        }
    }

}