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/*******************************************************************************
* Copyright (c) 2000, 2011 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.core.subscribers;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.core.runtime.IProgressMonitor;
/**
* This is an internal class that is used by the
* {@link org.eclipse.team.core.synchronize.SyncInfoFilter.ContentComparisonSyncInfoFilter}
* and {@link ContentComparisonDiffFilter} to compare the contents of the local
* and remote resources.
*/
public class ContentComparator extends AbstractContentComparator{
public ContentComparator(boolean ignoreWhitespace) {
super(ignoreWhitespace);
}
/**
* Returns <code>true</code> if both input streams byte contents is
* identical.
*
* @param is1
* first input to contents compare
* @param is2
* second input to contents compare
* @return <code>true</code> if content is equal
*/
protected boolean contentsEqual(IProgressMonitor monitor, InputStream is1,
InputStream is2, boolean ignoreWhitespace) {
try {
if (is1 == is2)
return true;
// no byte contents
if (is1 == null && is2 == null)
return true;
// only one has contents
if (is1 == null || is2 == null)
return false;
while (true) {
int c1 = is1.read();
while (shouldIgnoreWhitespace() && isWhitespace(c1))
c1 = is1.read();
int c2 = is2.read();
while (shouldIgnoreWhitespace() && isWhitespace(c2))
c2 = is2.read();
if (c1 == -1 && c2 == -1)
return true;
if (c1 != c2)
break;
}
} catch (IOException ex) {
} finally {
try {
try {
if (is1 != null) {
is1.close();
}
} finally {
if (is2 != null) {
is2.close();
}
}
} catch (IOException e) {
// Ignore
}
}
return false;
}
private boolean isWhitespace(int c) {
if (c == -1)
return false;
return Character.isWhitespace((char) c);
}
}
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