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/*******************************************************************************
* Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal 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: Matthew Khouzam - Initial API and implementation
* Contributors: Simon Marchi - Initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.internal.ctf.core.trace;
import java.io.Serializable;
import java.util.Comparator;
import org.eclipse.linuxtools.ctf.core.trace.StreamInputReader;
/**
* <b><u>StreamInputReaderTimestampComparator</u></b>
* <p>
* Compares two StreamInputReader by their timestamp (smaller comes before).
*/
public class StreamInputReaderTimestampComparator implements
Comparator<StreamInputReader>, Serializable {
// ------------------------------------------------------------------------
// Constants
// ------------------------------------------------------------------------
private static final long serialVersionUID = 1066434959451875045L;
// ------------------------------------------------------------------------
// Operations
// ------------------------------------------------------------------------
@Override
public int compare(StreamInputReader a, StreamInputReader b) {
// TODO: use unsigned comparison to avoid sign errors if needed
if (a.getCurrentEvent() == null) {
return 0;
}
if (b.getCurrentEvent() == null) {
return 0;
}
long ta = a.getCurrentEvent().getTimestamp();
long tb = b.getCurrentEvent().getTimestamp();
if (ta < tb) {
return -1;
} else if (ta > tb) {
return 1;
} else {
return 0;
}
}
}
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