/*******************************************************************************
* Copyright (c) 2002 - 2006 IBM Corporation.
* 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 com.ibm.wala.dataflow.IFDS;
import com.ibm.wala.util.intset.IntSet;
import com.ibm.wala.util.intset.SparseIntSet;
/**
* A function which kills a vector of incoming dataflow facts
*/
public class VectorKillFlowFunction implements IReversibleFlowFunction {
private final IntSet kill;
/**
* @param kill the intset of facts which are killed by this flow function
*/
private VectorKillFlowFunction(IntSet kill) {
if (kill == null) {
throw new IllegalArgumentException("null kill");
}
this.kill = kill;
}
@Override
public IntSet getTargets(int i) {
return (kill.contains(i)) ? null : SparseIntSet.singleton(i);
}
@Override
public IntSet getSources(int i) {
return (kill.contains(i)) ? null : SparseIntSet.singleton(i);
}
/**
* @param kill the intset of facts which should be killed by a function
* @return an instance of a flow function which kills these facts
*/
public static VectorKillFlowFunction make(IntSet kill) {
return new VectorKillFlowFunction(kill);
}
@Override
public String toString() {
return "VectorKill: " + kill;
}
}