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/*******************************************************************************
* Copyright (c) 2012, 2013 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 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.
*
* @author Matthew Khouzam
* @version 1.0
* @since 2.0
*/
public class CtfTmfContext implements ITmfContext {
// -------------------------------------------
// Fields
// -------------------------------------------
private CtfLocation curLocation;
private long curRank;
private final CtfTmfTrace fTrace;
// -------------------------------------------
// Constructor
// -------------------------------------------
/**
* Constructor
*
* @param ctfTmfTrace
* the parent trace
* @since 1.1
*/
public CtfTmfContext(CtfTmfTrace ctfTmfTrace) {
fTrace = ctfTmfTrace;
curLocation = new CtfLocation(new CtfLocationInfo(0, 0));
}
// -------------------------------------------
// TmfContext Overrides
// -------------------------------------------
@Override
public long getRank() {
return curRank;
}
@Override
public ITmfLocation getLocation() {
return curLocation;
}
@Override
public boolean hasValidRank() {
return curRank != CtfLocation.INVALID_LOCATION.getTimestamp();
}
@Override
public void setLocation(ITmfLocation location) {
curLocation = (CtfLocation) location;
if (curLocation != null) {
getIterator().seek(curLocation.getLocationInfo());
}
}
@Override
public void setRank(long rank) {
curRank = rank;
}
@Override
public void increaseRank() {
if (hasValidRank()) {
curRank++;
}
}
// -------------------------------------------
// CtfTmfTrace Helpers
// -------------------------------------------
/**
* Gets the trace of this context.
*
* @return The trace of this context
*/
public CtfTmfTrace getTrace() {
return fTrace;
}
/**
* 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() {
final CtfLocationInfo curLocationData = this.curLocation.getLocationInfo();
boolean retVal = getIterator().advance();
CtfTmfEvent currentEvent = getIterator().getCurrentEvent();
if (currentEvent != null) {
final long timestampValue = currentEvent.getTimestamp().getValue();
if (curLocationData.getTimestamp() == timestampValue) {
curLocation = new CtfLocation(timestampValue, curLocationData.getIndex() + 1);
} else {
curLocation = new CtfLocation(timestampValue, 0L);
}
} else {
curLocation = new CtfLocation(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 = new CtfLocation(timestamp, 0);
return getIterator().seek(timestamp);
}
/**
* Seeks to a given location. Wrapper to help CtfTmfTrace
* @param location
* unique location to find the event.
*
* @return success or not
* @since 2.0
*/
public synchronized boolean seek(final CtfLocationInfo location) {
curLocation = new CtfLocation(location);
return getIterator().seek(location);
}
@Override
public CtfTmfContext clone() {
CtfTmfContext ret = null;
try {
ret = (CtfTmfContext) super.clone();
/* Fields are immutable, no need to deep-copy them */
} catch (CloneNotSupportedException e) {
/* Should not happen, we're calling Object.clone() */
}
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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