001/*
002 * Copyright (c) 2013, 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.phases.common.util;
024
025import java.util.*;
026
027import com.oracle.graal.graph.Graph.NodeEvent;
028import com.oracle.graal.graph.Graph.NodeEventListener;
029import com.oracle.graal.graph.*;
030
031/**
032 * A simple {@link NodeEventListener} implementation that accumulates event nodes in a
033 * {@link HashSet}.
034 */
035public class HashSetNodeEventListener implements NodeEventListener {
036
037    private final Set<Node> nodes;
038    private final Set<NodeEvent> filter;
039
040    /**
041     * Creates a {@link NodeEventListener} that collects nodes from all events.
042     */
043    public HashSetNodeEventListener() {
044        this.nodes = Node.newSet();
045        this.filter = EnumSet.allOf(NodeEvent.class);
046    }
047
048    /**
049     * Creates a {@link NodeEventListener} that collects nodes from all events that match a given
050     * filter.
051     */
052    public HashSetNodeEventListener(Set<NodeEvent> filter) {
053        this.nodes = Node.newSet();
054        this.filter = filter;
055    }
056
057    /**
058     * Excludes a given event from those for which nodes are collected.
059     */
060    public HashSetNodeEventListener exclude(NodeEvent e) {
061        filter.remove(e);
062        return this;
063    }
064
065    public void event(NodeEvent e, Node node) {
066        if (filter.contains(e)) {
067            nodes.add(node);
068        }
069    }
070
071    /**
072     * Gets the set being used to accumulate the nodes communicated to this listener.
073     */
074    public Set<Node> getNodes() {
075        return nodes;
076    }
077}