com.googlecode.mashups.services.google.impl.GoogleSearchServiceImpl.java Source code

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Here is the source code for com.googlecode.mashups.services.google.impl.GoogleSearchServiceImpl.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 com.googlecode.mashups.services.google.impl;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONObject;

import com.googlecode.mashups.services.common.ServiceParameter;
import com.googlecode.mashups.services.common.ServiceParametersUtility;
import com.googlecode.mashups.services.google.api.GoogleSearchResultItem;
import com.googlecode.mashups.services.google.api.GoogleSearchService;
import com.googlecode.mashups.services.google.api.GoogleSearchServiceParameters;

public class GoogleSearchServiceImpl implements GoogleSearchService {
    private static final String REFERER = "Referer";
    private static final String REFERER_VALUE = "http://www.mashups4jsf.com";
    private static final String RESPONSE_DATA_ROOT = "responseData";
    private static final String RESPONSE_DATA_RESULTS = "results";
    private static final String TITLE = "title";
    private static final String TITLE_NO_FORMATTING = "titleNoFormatting";
    private static final String URL = "url";
    private static final String UNESCAPED_URL = "unescapedUrl";
    private static final String CACHE_URL = "cacheUrl";
    private static final String CONTENT = "content";
    private static final String VISIBLE_URL = "visibleUrl";
    private static final String GSEARCH_RESULT_CLASS = "GsearchResultClass";

    public static GoogleSearchService getInstance() {
        return googleSearchService;
    }

    public List<GoogleSearchResultItem> getWebSearchResultList(List<ServiceParameter> parameters) throws Exception {
        parameters = prepareQueryParameters(parameters);

        URL feedUrl = new URL(
                GOOGLE_SEARCH_SERVICE_URL + "?" + ServiceParametersUtility.toParametersString(parameters));
        List<GoogleSearchResultItem> searchResults = new ArrayList<GoogleSearchResultItem>();
        URLConnection connection = feedUrl.openConnection();

        connection.addRequestProperty(REFERER, REFERER_VALUE);

        String line;
        StringBuilder builder = new StringBuilder();
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));

        while ((line = reader.readLine()) != null) {
            builder.append(line);
        }

        JSONObject json = new JSONObject(builder.toString());
        JSONObject root = (JSONObject) json.get(RESPONSE_DATA_ROOT);
        JSONArray results = root.getJSONArray(RESPONSE_DATA_RESULTS);

        for (int i = 0; i < results.length(); ++i) {
            JSONObject searchItem = (JSONObject) results.get(i);

            // Get attributes.
            String title = (String) searchItem.get(TITLE);
            String titleNotFormatting = (String) searchItem.get(TITLE_NO_FORMATTING);
            String content = (String) searchItem.get(CONTENT);
            String cacheUrl = (String) searchItem.get(CACHE_URL);
            String unescapedUrl = (String) searchItem.get(UNESCAPED_URL);
            String visibleUrl = (String) searchItem.get(VISIBLE_URL);
            String url = (String) searchItem.get(URL);
            String GsearchResultClass = (String) searchItem.get(GSEARCH_RESULT_CLASS);

            // Fill the GoogleSearchResultItem.
            GoogleSearchResultItem googleSearchResultItem = new GoogleSearchResultItem();

            googleSearchResultItem.setTitle(title);
            googleSearchResultItem.setTitleNotFormatting(titleNotFormatting);
            googleSearchResultItem.setContent(content);
            googleSearchResultItem.setCacheUrl(cacheUrl);
            googleSearchResultItem.setUnescapedUrl(unescapedUrl);
            googleSearchResultItem.setVisibleUrl(visibleUrl);
            googleSearchResultItem.setUrl(url);
            googleSearchResultItem.setGsearchResultClass(GsearchResultClass);

            searchResults.add(googleSearchResultItem);
        }

        return searchResults;
    }

    /*
     * @param parameters
     * @return
     */
    private List<ServiceParameter> prepareQueryParameters(List<ServiceParameter> parameters) {
        if (parameters == null) {
            parameters = new ArrayList<ServiceParameter>();
        }

        if (parameters.contains(new ServiceParameter(GoogleSearchServiceParameters.VERSION))) {
            parameters.remove(new ServiceParameter(GoogleSearchServiceParameters.VERSION));
        }

        parameters.add(new ServiceParameter(GoogleSearchServiceParameters.VERSION, "1.0"));

        return parameters;
    }

    private GoogleSearchServiceImpl() {
    }

    private static GoogleSearchService googleSearchService = new GoogleSearchServiceImpl();
}