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/*
* Created on Dec 10, 2009
*
* PLACE_YOUR_DISTRIBUTION_STATEMENT_RIGHT_HERE
*/
package org.eclipse.osee.framework.ui.workspacebundleloader;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import org.eclipse.osee.framework.jdk.core.util.ChecksumUtil;
import org.eclipse.osee.framework.logging.OseeLog;
/**
* @author Andrew M. Finkbeiner
*
*/
public class FileChangeDetector {
private ConcurrentHashMap<URL, byte[]> bundleNameToMd5Map;
public FileChangeDetector(){
bundleNameToMd5Map = new ConcurrentHashMap<URL, byte[]>();
}
public boolean isChanged(URL url) {
byte[] digest = getMd5Checksum(url);
if (bundleNameToMd5Map.containsKey(url)) {
// check for bundle binary equality
if (!Arrays.equals(bundleNameToMd5Map.get(url), digest)) {
bundleNameToMd5Map.put(url, digest);
return true;
} else {
return false;
}
} else {
bundleNameToMd5Map.put(url, digest);
return true;
}
}
private byte[] getMd5Checksum(URL url) {
InputStream in = null;
byte[] digest = new byte[0];
try {
in = url.openStream();
digest = ChecksumUtil.createChecksum(url.openStream(), "MD5");
} catch (IOException ex) {
OseeLog.log(FileChangeDetector.class, Level.SEVERE, ex);
} catch (NoSuchAlgorithmException ex) {
OseeLog.log(FileChangeDetector.class, Level.SEVERE, ex);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException ex) {
OseeLog.log(FileChangeDetector.class, Level.SEVERE, ex);
}
}
}
return digest;
}
/**
* @param url
* @return
*/
public boolean remove(URL url) {
bundleNameToMd5Map.remove(url);
return true;
}
/**
*
*/
public void clear() {
bundleNameToMd5Map.clear();
}
}
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