| /* |
| * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.management; |
| |
| import java.util.*; |
| import com.sun.management.VMOption; |
| import com.sun.management.VMOption.Origin; |
| |
| /** |
| * Flag class is a helper class for constructing a VMOption. |
| * It has the static methods for getting the Flag objects, each |
| * corresponds to one VMOption. |
| * |
| */ |
| class Flag { |
| private String name; |
| private Object value; |
| private Origin origin; |
| private boolean writeable; |
| private boolean external; |
| |
| Flag(String name, Object value, boolean writeable, |
| boolean external, Origin origin) { |
| this.name = name; |
| this.value = value == null ? "" : value ; |
| this.origin = origin; |
| this.writeable = writeable; |
| this.external = external; |
| } |
| |
| Object getValue() { |
| return value; |
| } |
| |
| boolean isWriteable() { |
| return writeable; |
| } |
| |
| boolean isExternal() { |
| return external; |
| } |
| |
| VMOption getVMOption() { |
| return new VMOption(name, value.toString(), writeable, origin); |
| } |
| |
| static Flag getFlag(String name) { |
| String[] names = new String[1]; |
| names[0] = name; |
| |
| List<Flag> flags = getFlags(names, 1); |
| if (flags.isEmpty()) { |
| return null; |
| } else { |
| // flags should have only one element |
| return flags.get(0); |
| } |
| } |
| |
| static List<Flag> getAllFlags() { |
| int numFlags = getInternalFlagCount(); |
| |
| // Get all internal flags with names = null |
| return getFlags(null, numFlags); |
| } |
| |
| private static List<Flag> getFlags(String[] names, int numFlags) { |
| Flag[] flags = new Flag[numFlags]; |
| int count = getFlags(names, flags, numFlags); |
| |
| List<Flag> result = new ArrayList<Flag>(); |
| for (Flag f : flags) { |
| if (f != null) { |
| result.add(f); |
| } |
| } |
| return result; |
| } |
| |
| private static native String[] getAllFlagNames(); |
| // getFlags sets each element in the given flags array |
| // with a Flag object only if the name is valid and the |
| // type is supported. The flags array may contain null elements. |
| private static native int getFlags(String[] names, Flag[] flags, int count); |
| private static native int getInternalFlagCount(); |
| |
| // These set* methods are synchronized on the class object |
| // to avoid multiple threads updating the same flag at the same time. |
| static synchronized native void setLongValue(String name, long value); |
| static synchronized native void setBooleanValue(String name, boolean value); |
| static synchronized native void setStringValue(String name, String value); |
| |
| static { |
| initialize(); |
| } |
| private static native void initialize(); |
| } |