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annotate graal/com.oracle.jvmci.debug/src/com/oracle/jvmci/debug/DebugConfigScope.java @ 21694:ed731ad12a10

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Make stamp of checkcast more precise.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 03 Jun 2015 13:08:13 +0200
parents b1530a6cce8c
children
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.jvmci.debug;
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24
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25 import com.oracle.jvmci.debug.internal.*;
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26
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27 /**
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28 * A utility for scoping a change to the current debug
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29 * {@linkplain DebugScope#setConfig(DebugConfig) configuration}. For example:
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30 *
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31 * <pre>
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32 * DebugConfig config = ...;
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33 * try (DebugConfigScope s = new DebugConfigScope(config)) {
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34 * // ...
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35 * }
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36 * </pre>
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37 */
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38 public class DebugConfigScope implements AutoCloseable {
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39
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40 private final DebugConfig current;
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41
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42 /**
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43 * Sets the current debug {@linkplain DebugScope#setConfig(DebugConfig) configuration} to a
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44 * given value and creates an object that when {@linkplain #close() closed} resets the
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45 * configuration to the {@linkplain DebugScope#getConfig() current} configuration.
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46 */
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47 public DebugConfigScope(DebugConfig config) {
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48 this.current = DebugScope.getConfig();
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49 DebugScope.getInstance().setConfig(config);
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50 }
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51
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52 public void close() {
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53 DebugScope.getInstance().setConfig(current);
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54 }
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55 }