1 /*
   2  * Copyright (c) 2012, 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  */
  23 package org.graalvm.compiler.debug;
  24 
  25 import org.graalvm.compiler.debug.internal.DebugScope;
  26 
  27 /**
  28  * A utility for scoping a change to the current debug {@linkplain DebugScope#setConfig(DebugConfig)
  29  * configuration}. For example:
  30  *
  31  * <pre>
  32  *     DebugConfig config = ...;
  33  *     try (DebugConfigScope s = new DebugConfigScope(config)) {
  34  *         // ...
  35  *     }
  36  * </pre>
  37  */
  38 public class DebugConfigScope implements AutoCloseable {
  39 
  40     private final DebugConfig current;
  41 
  42     /**
  43      * Sets the current debug {@linkplain DebugScope#setConfig(DebugConfig) configuration} to a
  44      * given value and creates an object that when {@linkplain #close() closed} resets the
  45      * configuration to the {@linkplain DebugScope#getConfig() current} configuration.
  46      */
  47     public DebugConfigScope(DebugConfig config) {
  48         this.current = DebugScope.getConfig();
  49         DebugScope.getInstance().setConfig(config);
  50     }
  51 
  52     @Override
  53     public void close() {
  54         DebugScope.getInstance().setConfig(current);
  55     }
  56 }