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/*
* Copyright (C) 2010 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.gallery3d.data;
import com.android.gallery3d.common.Utils;
import com.android.gallery3d.util.ThreadPool.CancelListener;
import com.android.gallery3d.util.ThreadPool.JobContext;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.net.URL;
public class DownloadUtils {
private static final String TAG = "DownloadService";
public static boolean requestDownload(JobContext jc, URL url, File file) {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
return download(jc, url, fos);
} catch (Throwable t) {
return false;
} finally {
Utils.closeSilently(fos);
}
}
public static byte[] requestDownload(JobContext jc, URL url) {
ByteArrayOutputStream baos = null;
try {
baos = new ByteArrayOutputStream();
if (!download(jc, url, baos)) {
return null;
}
return baos.toByteArray();
} catch (Throwable t) {
Log.w(TAG, t);
return null;
} finally {
Utils.closeSilently(baos);
}
}
public static void dump(JobContext jc, InputStream is, OutputStream os)
throws IOException {
byte buffer[] = new byte[4096];
int rc = is.read(buffer, 0, buffer.length);
final Thread thread = Thread.currentThread();
jc.setCancelListener(new CancelListener() {
public void onCancel() {
thread.interrupt();
}
});
while (rc > 0) {
if (jc.isCancelled()) throw new InterruptedIOException();
os.write(buffer, 0, rc);
rc = is.read(buffer, 0, buffer.length);
}
jc.setCancelListener(null);
Thread.interrupted(); // consume the interrupt signal
}
public static boolean download(JobContext jc, URL url, OutputStream output) {
InputStream input = null;
try {
input = url.openStream();
dump(jc, input, output);
return true;
} catch (Throwable t) {
Log.w(TAG, "fail to download", t);
return false;
} finally {
Utils.closeSilently(input);
}
}
}
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