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/*******************************************************************************
* Copyright (c) 2012 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.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.tcf.te.tcf.filesystem.core.interfaces.IOperation;
import org.eclipse.tcf.te.tcf.filesystem.core.model.FSTreeNode;
/**
* The operation that computes the digest of the cache file in the background.
*/
public class OpTargetFileDigest implements IOperation {
// The digest of which is going to be computed.
FSTreeNode node;
// The computing result
byte[] digest;
/**
* Create an operation to compute the digest of its target file.
*
* @param node The file system node.
*/
public OpTargetFileDigest(FSTreeNode node) {
this.node = node;
}
/*
* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.filesystem.core.interfaces.IOperation#run(org.eclipse.core.runtime.IProgressMonitor)
*/
@Override
public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
BufferedInputStream input = null;
try {
long totalSize = node.attr.size;
int chunk_size = (int) totalSize / 100;
int percentRead = 0;
long bytesRead = 0;
URL url = node.getLocationURL();
MessageDigest digest = MessageDigest.getInstance(MD_ALG);
input = new BufferedInputStream(new DigestInputStream(url.openStream(), digest));
// The buffer used to download the file.
byte[] data = new byte[OpStreamOp.DEFAULT_CHUNK_SIZE];
int length;
while ((length = input.read(data)) >= 0){
bytesRead += length;
if (chunk_size != 0) {
int percent = (int) bytesRead / chunk_size;
if (percent != percentRead) { // Update the progress.
monitor.worked(percent - percentRead);
percentRead = percent; // Remember the percentage.
}
}
}
this.digest = digest.digest();
}
catch (NoSuchAlgorithmException e) {
throw new InvocationTargetException(e);
}
catch (IOException e) {
throw new InvocationTargetException(e);
}
finally {
if (input != null) {
try {input.close();} catch (Exception e) {}
}
}
}
/**
* Get the computing result.
*
* @return The message digest of this cache file.
*/
public byte[] getDigest() {
return digest;
}
/*
* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.filesystem.core.interfaces.IOperation#getName()
*/
@Override
public String getName() {
return "Update target digest"; //$NON-NLS-1$
}
/*
* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.filesystem.core.interfaces.IOperation#getTotalWork()
*/
@Override
public int getTotalWork() {
return 100;
}
}
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