001/*
002 * Copyright (c) 2011, 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 FilteredNodeIterable<T extends Node> implements NodeIterable<T> {
030
031    protected final NodeIterable<T> nodeIterable;
032    protected NodePredicate predicate = NodePredicates.alwaysTrue();
033
034    public FilteredNodeIterable(NodeIterable<T> nodeIterable) {
035        this.nodeIterable = nodeIterable;
036    }
037
038    public FilteredNodeIterable<T> and(NodePredicate nodePredicate) {
039        this.predicate = this.predicate.and(nodePredicate);
040        return this;
041    }
042
043    public FilteredNodeIterable<T> or(NodePredicate nodePredicate) {
044        this.predicate = this.predicate.or(nodePredicate);
045        return this;
046    }
047
048    @Override
049    public FilteredNodeIterable<T> nonNull() {
050        this.predicate = this.predicate.and(NodePredicates.isNotNull());
051        return this;
052    }
053
054    @Override
055    public DistinctFilteredNodeIterable<T> distinct() {
056        DistinctFilteredNodeIterable<T> distinct = new DistinctFilteredNodeIterable<>(nodeIterable);
057        distinct.predicate = predicate;
058        return distinct;
059    }
060
061    @Override
062    public Iterator<T> iterator() {
063        return new PredicatedProxyNodeIterator<>(nodeIterable.iterator(), predicate);
064    }
065
066    @SuppressWarnings("unchecked")
067    @Override
068    public <F extends T> FilteredNodeIterable<F> filter(Class<F> clazz) {
069        return (FilteredNodeIterable<F>) this.and(NodePredicates.isA(clazz));
070    }
071
072    @Override
073    public FilteredNodeIterable<T> filter(NodePredicate p) {
074        return this.and(p);
075    }
076
077    @Override
078    public FilteredNodeIterable<T> filterInterface(Class<?> iface) {
079        return this.and(NodePredicates.isAInterface(iface));
080    }
081}