001/*
002 * Copyright (c) 2012, 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.debug;
024
025import com.oracle.graal.debug.internal.*;
026
027/**
028 * A utility for scoping a change to the current debug
029 * {@linkplain DebugScope#setConfig(DebugConfig) configuration}. For example:
030 *
031 * <pre>
032 *     DebugConfig config = ...;
033 *     try (DebugConfigScope s = new DebugConfigScope(config)) {
034 *         // ...
035 *     }
036 * </pre>
037 */
038public class DebugConfigScope implements AutoCloseable {
039
040    private final DebugConfig current;
041
042    /**
043     * Sets the current debug {@linkplain DebugScope#setConfig(DebugConfig) configuration} to a
044     * given value and creates an object that when {@linkplain #close() closed} resets the
045     * configuration to the {@linkplain DebugScope#getConfig() current} configuration.
046     */
047    public DebugConfigScope(DebugConfig config) {
048        this.current = DebugScope.getConfig();
049        DebugScope.getInstance().setConfig(config);
050    }
051
052    public void close() {
053        DebugScope.getInstance().setConfig(current);
054    }
055}