001/*
002 * Copyright (c) 2014, 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;
024
025import static com.oracle.graal.graph.Graph.*;
026
027import com.oracle.graal.graph.iterators.*;
028
029class NodeUsageIterable implements NodeIterable<Node> {
030
031    private final Node node;
032
033    NodeUsageIterable(Node node) {
034        this.node = node;
035    }
036
037    public NodeUsageIterator iterator() {
038        if (MODIFICATION_COUNTS_ENABLED) {
039            return new NodeUsageWithModCountIterator(node);
040        } else {
041            return new NodeUsageIterator(node);
042        }
043    }
044
045    @Override
046    public Node first() {
047        return node.usage0;
048    }
049
050    @Override
051    public boolean isEmpty() {
052        return node.usage0 == null;
053    }
054
055    @Override
056    public boolean isNotEmpty() {
057        return node.usage0 != null;
058    }
059
060    @Override
061    public int count() {
062        return node.getUsageCount();
063    }
064}