com.ijuru.kumva.app.site.FetchSuggestionsTask.java Source code

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Here is the source code for com.ijuru.kumva.app.site.FetchSuggestionsTask.java

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/**
 * Copyright 2011 Rowan Seymour
 * 
 * This file is part of Kumva.
 *
 * Kumva is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Kumva is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Kumva. If not, see <http://www.gnu.org/licenses/>.
 */

package com.ijuru.kumva.app.site;

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;

/**
 * Task to fetch suggestions for a search term
 */
public class FetchSuggestionsTask extends FetchTask<List<Suggestion>> {

    private Dictionary dictionary;
    private int timeout;

    /**
     * Creates a feth suggestions task
     * @param dictionary the dictionary
     * @param timeout the timeout in milliseconds
     */
    public FetchSuggestionsTask(Dictionary dictionary, int timeout) {
        this.dictionary = dictionary;
        this.timeout = timeout;
    }

    @Override
    protected List<Suggestion> fetch(String term) {
        URL url = dictionary.createSuggestionsURL(term);

        URLConnection connection;
        try {
            connection = url.openConnection();
            connection.setConnectTimeout(timeout);
            connection.setReadTimeout(timeout);

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

            while ((line = reader.readLine()) != null)
                sb.append(line);

            JSONArray jsonArray = new JSONArray(sb.toString());
            List<Suggestion> suggestions = new ArrayList<Suggestion>();

            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                String text = jsonObject.getString("value");
                String lang = jsonObject.getString("lang");
                suggestions.add(new Suggestion(text, lang));
            }

            return suggestions;

        } catch (Exception e) {
            return null;
        }
    }
}