FilteredNodeIterable.java revision 12657:6ef01bd40ce2 
1/*
2 * Copyright (c) 2011, 2016, 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.
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23package org.graalvm.compiler.graph.iterators;
24
25import java.util.Iterator;
26
27import org.graalvm.compiler.graph.Node;
28
29public class FilteredNodeIterable<T extends Node> implements NodeIterable<T> {
30
31    protected final NodeIterable<T> nodeIterable;
32    protected NodePredicate predicate = NodePredicates.alwaysTrue();
33
34    public FilteredNodeIterable(NodeIterable<T> nodeIterable) {
35        this.nodeIterable = nodeIterable;
36    }
37
38    public FilteredNodeIterable<T> and(NodePredicate nodePredicate) {
39        this.predicate = this.predicate.and(nodePredicate);
40        return this;
41    }
42
43    @Override
44    public Iterator<T> iterator() {
45        return new PredicatedProxyNodeIterator<>(nodeIterable.iterator(), predicate);
46    }
47
48    @SuppressWarnings("unchecked")
49    @Override
50    public <F extends T> FilteredNodeIterable<F> filter(Class<F> clazz) {
51        return (FilteredNodeIterable<F>) this.and(NodePredicates.isA(clazz));
52    }
53
54    @Override
55    public FilteredNodeIterable<T> filter(NodePredicate p) {
56        return this.and(p);
57    }
58
59}
60