51 lines
1.3 KiB
Java
51 lines
1.3 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.dataflow.IFDS;
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import com.ibm.wala.util.intset.SparseIntSet;
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/**
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* A flow function which has only the edge 0 -> dest
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*/
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public class SingletonFlowFunction implements IReversibleFlowFunction {
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final private static SparseIntSet zeroSet = SparseIntSet.singleton(0);
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final int dest;
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private SingletonFlowFunction(int dest) {
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this.dest = dest;
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}
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@Override
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public SparseIntSet getTargets(int i) {
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if (i == 0) {
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return SparseIntSet.add(zeroSet,dest);
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} else {
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return null;
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}
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}
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@Override
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public SparseIntSet getSources(int i) {
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if (i == dest || i == 0) {
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return zeroSet;
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} else {
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return null;
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}
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}
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public static SingletonFlowFunction create(int dest) {
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return new SingletonFlowFunction(dest);
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}
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}
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