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 */
23package org.graalvm.compiler.graph.iterators;
24
25import java.util.Iterator;
26
27import org.graalvm.compiler.graph.Node;
28
29public 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}
49