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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2010, 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.management; | ||
| 27 | |||
| 28 | import java.util.*; | ||
| 29 | import com.sun.management.VMOption; | ||
| 30 | import com.sun.management.VMOption.Origin; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * Flag class is a helper class for constructing a VMOption. | ||
| 34 | * It has the static methods for getting the Flag objects, each | ||
| 35 | * corresponds to one VMOption. | ||
| 36 | * | ||
| 37 | */ | ||
| 38 | class Flag { | ||
| 39 | private String name; | ||
| 40 | private Object value; | ||
| 41 | private Origin origin; | ||
| 42 | private boolean writeable; | ||
| 43 | private boolean external; | ||
| 44 | |||
| 45 | Flag(String name, Object value, boolean writeable, | ||
| 46 | boolean external, Origin origin) { | ||
| 47 | this.name = name; | ||
| 48 | this.value = value == null ? "" : value ; | ||
| 49 | this.origin = origin; | ||
| 50 | this.writeable = writeable; | ||
| 51 | this.external = external; | ||
| 52 | } | ||
| 53 | |||
| 54 | Object getValue() { | ||
| 55 | return value; | ||
| 56 | } | ||
| 57 | |||
| 58 | boolean isWriteable() { | ||
| 59 | return writeable; | ||
| 60 | } | ||
| 61 | |||
| 62 | boolean isExternal() { | ||
| 63 | return external; | ||
| 64 | } | ||
| 65 | |||
| 66 | VMOption getVMOption() { | ||
| 67 | return new VMOption(name, value.toString(), writeable, origin); | ||
| 68 | } | ||
| 69 | |||
| 70 | static Flag getFlag(String name) { | ||
| 71 | String[] names = new String[1]; | ||
| 72 | names[0] = name; | ||
| 73 | |||
| 74 | List<Flag> flags = getFlags(names, 1); | ||
| 75 | if (flags.isEmpty()) { | ||
| 76 | return null; | ||
| 77 | } else { | ||
| 78 | // flags should have only one element | ||
| 79 | return flags.get(0); | ||
| 80 | } | ||
| 81 | } | ||
| 82 | |||
| 83 | static List<Flag> getAllFlags() { | ||
| 84 | int numFlags = getInternalFlagCount(); | ||
| 85 | |||
| 86 | // Get all internal flags with names = null | ||
| 87 | return getFlags(null, numFlags); | ||
| 88 | } | ||
| 89 | |||
| 90 | private static List<Flag> getFlags(String[] names, int numFlags) { | ||
| 91 | Flag[] flags = new Flag[numFlags]; | ||
| 92 | int count = getFlags(names, flags, numFlags); | ||
| 93 | |||
| 94 | List<Flag> result = new ArrayList<Flag>(); | ||
| 95 | for (Flag f : flags) { | ||
| 96 | if (f != null) { | ||
| 97 | result.add(f); | ||
| 98 | } | ||
| 99 | } | ||
| 100 | return result; | ||
| 101 | } | ||
| 102 | |||
| 103 | private static native String[] getAllFlagNames(); | ||
| 104 | // getFlags sets each element in the given flags array | ||
| 105 | // with a Flag object only if the name is valid and the | ||
| 106 | // type is supported. The flags array may contain null elements. | ||
| 107 | private static native int getFlags(String[] names, Flag[] flags, int count); | ||
| 108 | private static native int getInternalFlagCount(); | ||
| 109 | |||
| 110 | // These set* methods are synchronized on the class object | ||
| 111 | // to avoid multiple threads updating the same flag at the same time. | ||
| 112 | static synchronized native void setLongValue(String name, long value); | ||
| 113 | static synchronized native void setBooleanValue(String name, boolean value); | ||
| 114 | static synchronized native void setStringValue(String name, String value); | ||
| 115 | |||
| 116 | static { | ||
| 117 | initialize(); | ||
| 118 | } | ||
| 119 | private static native void initialize(); | ||
| 120 | } | ||