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/*******************************************************************************
* Copyright (c) 2011, 2015 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.tcf.filesystem.core.internal.operations;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.osgi.util.NLS;
import org.eclipse.tcf.te.tcf.filesystem.core.internal.FSTreeNode;
import org.eclipse.tcf.te.tcf.filesystem.core.internal.url.TcfURLConnection;
import org.eclipse.tcf.te.tcf.filesystem.core.internal.utils.FileState;
import org.eclipse.tcf.te.tcf.filesystem.core.internal.utils.PersistenceManager;
import org.eclipse.tcf.te.tcf.filesystem.core.internal.utils.StatusHelper;
import org.eclipse.tcf.te.tcf.filesystem.core.nls.Messages;
public class OpDownload extends AbstractOperation {
private final OutputStream fTarget;
private final FSTreeNode fSource;
private final boolean fResetDigest;
public OpDownload(FSTreeNode srcNode, OutputStream target) {
fTarget = target;
fSource = srcNode;
fResetDigest = target == null;
}
@Override
public IStatus doRun(IProgressMonitor monitor) {
try {
if (fTarget != null) {
downloadFile(fSource, fTarget, monitor);
} else {
OutputStream out = new BufferedOutputStream(new FileOutputStream(fSource.getCacheFile()));
try {
downloadFile(fSource, out, monitor);
} finally {
try {
out.close();
} catch(IOException e) {
}
}
}
} catch (Exception e) {
if (fTarget == null) {
fSource.getCacheFile().delete();
}
return StatusHelper.createStatus("Cannot download " + fSource.getName(), e); //$NON-NLS-1$
}
return monitor.isCanceled() ? Status.CANCEL_STATUS : Status.OK_STATUS;
}
private void downloadFile(FSTreeNode source, OutputStream out, IProgressMonitor monitor) throws IOException {
byte[] data = new byte[DEFAULT_CHUNK_SIZE];
long size = source.getSize();
long percentSize = size / 100;
int percentRead = 0;
long bytesRead = 0;
monitor.beginTask(getName(), 100);
MessageDigest digest = null;
BufferedInputStream input = null;
TcfURLConnection connection = (TcfURLConnection) source.getLocationURL().openConnection();
try {
try {
digest = MessageDigest.getInstance(MD_ALG);
input = new BufferedInputStream(new DigestInputStream(connection.getInputStream(), digest));
} catch (NoSuchAlgorithmException e) {
input = new BufferedInputStream(connection.getInputStream());
}
String fileLength = formatSize(size);
int length;
while ((length = input.read(data)) >= 0 && !monitor.isCanceled()) {
out.write(data, 0, length);
bytesRead += length;
if (percentSize != 0) {
int percent = (int) (bytesRead / percentSize);
if (percent != percentRead) { // Update the progress.
monitor.worked(percent - percentRead);
percentRead = percent; // Remember the percentage.
// Report the progress.
monitor.subTask(NLS.bind(Messages.OpDownload_Downloading, new Object[]{source.getName(), formatSize(bytesRead), fileLength}));
}
}
}
if (!monitor.isCanceled()) {
if (digest != null) {
updateNodeDigest(source, digest.digest());
}
}
} finally {
out.flush();
if (input != null) {
try {
input.close();
} catch (Exception e) {
}
}
}
}
/**
* Update the node's digest using the digest data.
*
* @param node The node whose digest should updated.
* @param digest The digest data.
*/
protected void updateNodeDigest(FSTreeNode node, byte[] digest) {
FileState fileDigest = PersistenceManager.getInstance().getFileDigest(node);
if (fResetDigest) {
fileDigest.reset(digest);
} else {
fileDigest.updateTargetDigest(digest);
}
}
@Override
public String getName() {
return NLS.bind(Messages.OpDownload_DownloadingSingleFile, fSource.getName());
}
}
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