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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.android.internal.location;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.params.ConnRouteParams;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.Random;
import android.content.Context;
import android.net.Proxy;
import android.util.Config;
import android.util.Log;
import com.android.common.AndroidHttpClient;
/**
* A class for downloading GPS XTRA data.
*
* {@hide}
*/
public class GpsXtraDownloader {
private static final String TAG = "GpsXtraDownloader";
private Context mContext;
private String[] mXtraServers;
// to load balance our server requests
private int mNextServerIndex;
GpsXtraDownloader(Context context, Properties properties) {
mContext = context;
// read XTRA servers from the Properties object
int count = 0;
String server1 = properties.getProperty("XTRA_SERVER_1");
String server2 = properties.getProperty("XTRA_SERVER_2");
String server3 = properties.getProperty("XTRA_SERVER_3");
if (server1 != null) count++;
if (server2 != null) count++;
if (server3 != null) count++;
if (count == 0) {
Log.e(TAG, "No XTRA servers were specified in the GPS configuration");
return;
} else {
mXtraServers = new String[count];
count = 0;
if (server1 != null) mXtraServers[count++] = server1;
if (server2 != null) mXtraServers[count++] = server2;
if (server3 != null) mXtraServers[count++] = server3;
// randomize first server
Random random = new Random();
mNextServerIndex = random.nextInt(count);
}
}
byte[] downloadXtraData() {
String proxyHost = Proxy.getHost(mContext);
int proxyPort = Proxy.getPort(mContext);
boolean useProxy = (proxyHost != null && proxyPort != -1);
byte[] result = null;
int startIndex = mNextServerIndex;
if (mXtraServers == null) {
return null;
}
// load balance our requests among the available servers
while (result == null) {
result = doDownload(mXtraServers[mNextServerIndex], useProxy, proxyHost, proxyPort);
// increment mNextServerIndex and wrap around if necessary
mNextServerIndex++;
if (mNextServerIndex == mXtraServers.length) {
mNextServerIndex = 0;
}
// break if we have tried all the servers
if (mNextServerIndex == startIndex) break;
}
return result;
}
protected static byte[] doDownload(String url, boolean isProxySet,
String proxyHost, int proxyPort) {
if (Config.LOGD) Log.d(TAG, "Downloading XTRA data from " + url);
AndroidHttpClient client = null;
try {
client = AndroidHttpClient.newInstance("Android");
HttpUriRequest req = new HttpGet(url);
if (isProxySet) {
HttpHost proxy = new HttpHost(proxyHost, proxyPort);
ConnRouteParams.setDefaultProxy(req.getParams(), proxy);
}
req.addHeader(
"Accept",
"*/*, application/vnd.wap.mms-message, application/vnd.wap.sic");
req.addHeader(
"x-wap-profile",
"http://www.openmobilealliance.org/tech/profiles/UAPROF/ccppschema-20021212#");
HttpResponse response = client.execute(req);
StatusLine status = response.getStatusLine();
if (status.getStatusCode() != 200) { // HTTP 200 is success.
if (Config.LOGD) Log.d(TAG, "HTTP error: " + status.getReasonPhrase());
return null;
}
HttpEntity entity = response.getEntity();
byte[] body = null;
if (entity != null) {
try {
if (entity.getContentLength() > 0) {
body = new byte[(int) entity.getContentLength()];
DataInputStream dis = new DataInputStream(entity.getContent());
try {
dis.readFully(body);
} finally {
try {
dis.close();
} catch (IOException e) {
Log.e(TAG, "Unexpected IOException.", e);
}
}
}
} finally {
if (entity != null) {
entity.consumeContent();
}
}
}
return body;
} catch (Exception e) {
if (Config.LOGD) Log.d(TAG, "error " + e);
} finally {
if (client != null) {
client.close();
}
}
return null;
}
}
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