38 lines
1.1 KiB
Java
38 lines
1.1 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.util.graph;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Iterator;
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import com.ibm.wala.util.collections.HashSetFactory;
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/**
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* TODO: Move this somewhere.
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*/
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public class InferGraphRoots {
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public static <T> Collection<T> inferRoots(Graph<T> g){
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if (g == null) {
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throw new IllegalArgumentException("g is null");
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}
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HashSet<T> s = HashSetFactory.make();
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for (Iterator<? extends T> it = g.iterator(); it.hasNext();) {
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T node = it.next();
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if (g.getPredNodeCount(node) == 0) {
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s.add(node);
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}
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}
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return s;
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}
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}
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