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/*******************************************************************************
* Copyright (c) 2012 Ericsson
*
* 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
*******************************************************************************/
package org.eclipse.linuxtools.tmf.core.ctfadaptor;
import java.util.ArrayList;
import java.util.ListIterator;
import org.eclipse.linuxtools.tmf.core.trace.ITmfContext;
import org.eclipse.linuxtools.tmf.core.trace.ITmfLocation;
/**
* Lightweight Context for CtfTmf traces. Should only use 3 references, 1 ref to
* a boxed Long, a long and an int.
*
* @versionj 1.0
* @author Matthew Khouzam
*/
public class CtfTmfLightweightContext implements ITmfContext {
// -------------------------------------------
// Fields
// -------------------------------------------
private CtfLocation curLocation;
private long curRank;
private final CtfTmfTrace fTrace;
// -------------------------------------------
// Constructor
// -------------------------------------------
/**
* Deprecated, use CtfTmfLightweightContext( CtfTmfTrace please )
*
* @param iters
* the shared iterator pool.
* @param pos
* the iterator position.
*/
@Deprecated
public CtfTmfLightweightContext(ArrayList<CtfIterator> iters,
ListIterator<CtfIterator> pos) {
fTrace = iters.get(0).getCtfTmfTrace();
curLocation = new CtfLocation((Long) null);
}
/**
*
* @param ctfTmfTrace
* the parent trace
* @since 1.1
*/
public CtfTmfLightweightContext(CtfTmfTrace ctfTmfTrace) {
fTrace = ctfTmfTrace;
curLocation = new CtfLocation((Long) null);
}
// -------------------------------------------
// TmfContext Overrides
// -------------------------------------------
@Override
public long getRank() {
return curRank;
}
@Override
public ITmfLocation<? extends Comparable<?>> getLocation() {
return curLocation;
}
@Override
public boolean hasValidRank() {
return curRank != CtfLocation.INVALID_LOCATION;
}
@Override
public void setLocation(ITmfLocation<? extends Comparable<?>> location) {
curLocation = (CtfLocation) location;
getIterator().seek(curLocation.getLocation());
}
@Override
public void setRank(long rank) {
curRank = rank;
}
@Override
public void increaseRank() {
if (hasValidRank()) {
curRank++;
}
}
// -------------------------------------------
// CtfTmfTrace Helpers
// -------------------------------------------
/**
* Gets the current event. Wrapper to help CtfTmfTrace
*
* @return The event or null
*/
public synchronized CtfTmfEvent getCurrentEvent() {
return getIterator().getCurrentEvent();
}
/**
* Advances to a the next event. Wrapper to help CtfTmfTrace
*
* @return success or not
*/
public synchronized boolean advance() {
boolean retVal = getIterator().advance();
CtfTmfEvent currentEvent = getIterator().getCurrentEvent();
if (currentEvent != null) {
curLocation.setLocation(currentEvent.getTimestampValue());
} else {
curLocation.setLocation(CtfLocation.INVALID_LOCATION);
}
return retVal;
}
@Override
public void dispose() {
// do nothing
}
/**
* Seeks to a given timestamp. Wrapper to help CtfTmfTrace
*
* @param timestamp
* desired timestamp
* @return success or not
*/
public synchronized boolean seek(final long timestamp) {
curLocation.setLocation(timestamp);
return getIterator().seek(timestamp);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#clone()
*/
@Override
public CtfTmfLightweightContext clone() {
CtfTmfLightweightContext ret = new CtfTmfLightweightContext(fTrace);
ret.curLocation = curLocation.clone();
ret.curRank = curRank;
return ret;
}
// -------------------------------------------
// Private helpers
// -------------------------------------------
/**
* Get iterator, called every time to get an iterator, no local copy is
* stored so that there is no need to "update"
*
* @return an iterator
*/
private CtfIterator getIterator() {
return CtfIteratorManager.getIterator(fTrace, this);
}
}
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