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/*
* Copyright (C) 2013 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 android.print;
import android.os.AsyncTask;
import android.os.CancellationSignal;
import android.os.CancellationSignal.OnCancelListener;
import android.util.Log;
import libcore.io.IoUtils;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Adapter for printing files.
*/
class PrintFileAdapter extends PrintAdapter {
private static final String LOG_TAG = "PrintFileAdapter";
private final File mFile;
private WriteFileAsyncTask mWriteFileAsyncTask;
public PrintFileAdapter(File file) {
if (file == null) {
throw new IllegalArgumentException("File cannot be null!");
}
mFile = file;
}
@Override
public void onPrint(List<PageRange> pages, FileDescriptor destination,
CancellationSignal cancellationSignal, PrintProgressCallback progressListener) {
mWriteFileAsyncTask = new WriteFileAsyncTask(mFile, destination, cancellationSignal,
progressListener);
mWriteFileAsyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
(Void[]) null);
}
@Override
public PrintAdapterInfo getInfo() {
// TODO: When we have PDF render library we should query the page count.
return new PrintAdapterInfo.Builder().create();
}
private static final class WriteFileAsyncTask extends AsyncTask<Void, Void, Void> {
private final File mSource;
private final FileDescriptor mDestination;
private final PrintProgressCallback mProgressListener;
private final CancellationSignal mCancellationSignal;
public WriteFileAsyncTask(File source, FileDescriptor destination,
CancellationSignal cancellationSignal, PrintProgressCallback progressListener) {
mSource = source;
mDestination = destination;
mProgressListener = progressListener;
mCancellationSignal = cancellationSignal;
mCancellationSignal.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel() {
cancel(true);
}
});
}
@Override
protected Void doInBackground(Void... params) {
InputStream in = null;
OutputStream out = new FileOutputStream(mDestination);
final byte[] buffer = new byte[8192];
try {
in = new FileInputStream(mSource);
while (true) {
final int readByteCount = in.read(buffer);
if (readByteCount < 0) {
break;
}
out.write(buffer, 0, readByteCount);
}
} catch (IOException ioe) {
Log.e(LOG_TAG, "Error writing data!", ioe);
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
if (!isCancelled()) {
List<PageRange> pages = new ArrayList<PageRange>();
pages.add(PageRange.ALL_PAGES);
mProgressListener.onPrintFinished(pages);
} else {
mProgressListener.onPrintFailed("Cancelled");
}
}
return null;
}
}
}
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