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/*******************************************************************************
* Copyright (c) 2018 École Polytechnique de Montréal
*
* 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
*******************************************************************************/
package org.eclipse.tracecompass.incubator.callstack.core.instrumented;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.tracecompass.incubator.callstack.core.flamechart.CallStack;
import com.google.common.base.Objects;
/**
* A class that associates a callstack with a depth, to abstract the state
* system accesses.
*
* @author Geneviève Bastien
*/
public class CallStackDepth {
private final CallStack fCallstack;
private final int fDepth;
/**
* Constructor. The caller must make sure that the callstack has the requested
* depth.
*
* @param callstack
* The callstack
* @param depth
* The depth of the callstack
*/
public CallStackDepth(CallStack callstack, int depth) {
fCallstack = callstack;
fDepth = depth;
}
/**
* Get the quark corresponding to this callstack depth
*
* @return The quark at this depth
*/
public int getQuark() {
return fCallstack.getQuarkAtDepth(fDepth);
}
/**
* Get the callstack corresponding to this callstack depth
*
* @return The callstack
*/
public CallStack getCallStack() {
return fCallstack;
}
@Override
public int hashCode() {
// Compare with the actual callstack object, as the callstack's own hash may
// change as the callstack is built. Here, we are looking for the same object,
// no matter its content
return Objects.hashCode(System.identityHashCode(fCallstack), fDepth);
}
@Override
public boolean equals(@Nullable Object obj) {
if (!(obj instanceof CallStackDepth)) {
return false;
}
CallStackDepth csd = (CallStackDepth) obj;
// Compare with the actual callstack object, as the callstack's own hash may
// change as the callstack is built. Here, we are looking for the same object,
// no matter its content
return Objects.equal(System.identityHashCode(fCallstack), System.identityHashCode(csd.fCallstack)) && (fDepth == csd.fDepth);
}
@Override
public String toString() {
return fCallstack + " at depth " + fDepth; //$NON-NLS-1$
}
}
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