es.deustotech.piramide.utils.net.GoogleLocalClient.java Source code

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Here is the source code for es.deustotech.piramide.utils.net.GoogleLocalClient.java

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/*
 * Copyright (C) 2010 PIRAmIDE-SP3 authors
 *
 * 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.
 * 
 * This software consists of contributions made by many individuals, 
 * listed below:
 *
 * Author: Pablo Ordua <pablo.orduna@deusto.es>
 *
 */

package es.deustotech.piramide.utils.net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.Vector;

import org.apache.http.HttpEntity;
import org.json.JSONArray;
import org.json.JSONObject;

import android.util.Log;

import es.deustotech.piramide.utils.constants.Constants;
import es.deustotech.piramide.utils.parcelable.Point;

public class GoogleLocalClient {

    private final String selection;
    private final double latitude;
    private final double longitude;

    private static final int MAX_PAGES_TO_PARSE = 8;

    public static final String[] URI = new String[] {
            "http://ajax.googleapis.com/ajax/services/search/local?v=1.0&q=category:+'", "'&sll=", ",",
            "&rsz=large&start=0" };

    public static class GoogleLocalException extends Exception {
        private static final long serialVersionUID = -3750604856982935160L;

        public GoogleLocalException() {
            super();
        }

        public GoogleLocalException(String detailMessage, Throwable throwable) {
            super(detailMessage, throwable);
        }

        public GoogleLocalException(String detailMessage) {
            super(detailMessage);
        }

        public GoogleLocalException(Throwable throwable) {
            super(throwable);
        }
    }

    public GoogleLocalClient(String selection, double latitude, double longitude) {
        if (selection.equalsIgnoreCase(Constants.GAS_STATION)) {
            this.selection = Constants.GAS_STATION_FORMATTED;
        } else {
            this.selection = selection;
        }
        this.latitude = latitude;
        this.longitude = longitude;
    }

    public Vector<Point> getPoints() throws GoogleLocalException {
        final Vector<Point> points = new Vector<Point>();
        int position = 0;
        String start = "0";
        JSONArray pages;
        do {
            try {
                final URI baseURI = new URI(URI[0] + selection + URI[1] + String.valueOf(latitude) + URI[2]
                        + String.valueOf(longitude) + URI[3] + start);
                Log.w("GoogleLocalClient", baseURI.toURL().toString());
                final HttpEntity entity = RestClient.connect(baseURI.toURL().toString(), null);
                final String content = convertStreamToString(entity.getContent());
                final JSONObject jsonObj = new JSONObject(content);
                final JSONObject responseData = jsonObj.getJSONObject("responseData");
                final JSONObject cursor = responseData.getJSONObject("cursor");
                if (!cursor.has("pages"))
                    break; // No pages, no results

                pages = cursor.getJSONArray("pages");
                position++;
                if (position < pages.length()) {
                    final JSONObject nextPage = pages.getJSONObject(position);
                    start = nextPage.getString("start");
                }

                final JSONArray results = responseData.getJSONArray("results");
                for (int i = 0; i < results.length(); ++i) {
                    final JSONObject result = results.getJSONObject(i);
                    final Point point = new Point(result.getString(Constants.JSON_TITLE),
                            result.getString(Constants.JSON_STREET), result.getString(Constants.JSON_LAT),
                            result.getString(Constants.JSON_LNG));
                    points.add(point);
                }

            } catch (Exception e) {
                throw new GoogleLocalException(e.getMessage(), e);
            }
        } while (position < pages.length() && position < MAX_PAGES_TO_PARSE);

        Log.w("GoogleLocalClient", Integer.valueOf(points.size()).toString());

        return points;
    }

    private static String convertStreamToString(InputStream inStream) {
        final BufferedReader reader = new BufferedReader(new InputStreamReader(inStream));
        StringBuilder sb = new StringBuilder();
        String line = null;

        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + Constants.NEXT_LINE);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                inStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}