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/*
* Copyright (c) 2003, 2012, 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<>();
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();
}
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