001/*
002 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.graph.iterators;
024
025import java.util.*;
026
027import com.oracle.graal.graph.*;
028
029public class PredicatedProxyNodeIterator<T extends Node> extends NodeIterator<T> {
030
031    private final Iterator<T> iterator;
032    private final NodePredicate predicate;
033
034    public PredicatedProxyNodeIterator(Iterator<T> iterator, NodePredicate predicate) {
035        this.iterator = iterator;
036        this.predicate = predicate;
037    }
038
039    @Override
040    protected void forward() {
041        while ((current == null || !current.isAlive() || !predicate.apply(current)) && iterator.hasNext()) {
042            current = iterator.next();
043        }
044        if (current != null && (!current.isAlive() || !predicate.apply(current))) {
045            current = null;
046        }
047    }
048}