1/*
2 * Copyright (c) 2014, 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;
24
25import static org.graalvm.compiler.graph.Graph.isModificationCountsEnabled;
26
27import java.util.Iterator;
28
29import org.graalvm.compiler.graph.iterators.NodeIterable;
30
31class NodeUsageIterable implements NodeIterable<Node> {
32
33    private final Node node;
34
35    NodeUsageIterable(Node node) {
36        this.node = node;
37    }
38
39    @Override
40    public NodeUsageIterator iterator() {
41        if (isModificationCountsEnabled()) {
42            return new NodeUsageWithModCountIterator(node);
43        } else {
44            return new NodeUsageIterator(node);
45        }
46    }
47
48    @Override
49    public Node first() {
50        return node.usage0;
51    }
52
53    @Override
54    public boolean isEmpty() {
55        return node.usage0 == null;
56    }
57
58    @Override
59    public boolean isNotEmpty() {
60        return node.usage0 != null;
61    }
62
63    @Override
64    public int count() {
65        return node.getUsageCount();
66    }
67
68    @Override
69    public String toString() {
70        StringBuilder sb = new StringBuilder();
71        Iterator<Node> iterator = iterator();
72        boolean first = true;
73        sb.append("usages=");
74        sb.append('[');
75        while (iterator.hasNext()) {
76            Node input = iterator.next();
77            if (!first) {
78                sb.append(", ");
79            }
80            sb.append(input);
81            first = false;
82        }
83        sb.append(']');
84        return sb.toString();
85    }
86}
87