1 /* 2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.graph.iterators; 24 25 import java.util.Iterator; 26 27 import org.graalvm.compiler.graph.Node; 28 29 public class PredicatedProxyNodeIterator<T extends Node> extends NodeIterator<T> { 30 31 private final Iterator<T> iterator; 32 private final NodePredicate predicate; 33 34 public PredicatedProxyNodeIterator(Iterator<T> iterator, NodePredicate predicate) { 35 this.iterator = iterator; 36 this.predicate = predicate; 37 } 38 39 @Override 40 protected void forward() { 41 while ((current == null || !current.isAlive() || !predicate.apply(current)) && iterator.hasNext()) { 42 current = iterator.next(); 43 } 44 if (current != null && (!current.isAlive() || !predicate.apply(current))) { 45 current = null; 46 } 47 } 48 }