0N/A/*
2362N/A * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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0N/A */
0N/A
0N/Apackage com.sun.jmx.mbeanserver;
0N/A
0N/Aimport java.lang.ref.WeakReference;
0N/Aimport java.util.WeakHashMap;
0N/Aimport javax.management.Descriptor;
0N/Aimport javax.management.ImmutableDescriptor;
0N/Aimport javax.management.JMX;
0N/A
0N/Apublic class DescriptorCache {
0N/A private DescriptorCache() {
0N/A }
0N/A
0N/A static DescriptorCache getInstance() {
0N/A return instance;
0N/A }
0N/A
0N/A public static DescriptorCache getInstance(JMX proof) {
0N/A if (proof != null)
0N/A return instance;
0N/A else
0N/A return null;
0N/A }
0N/A
0N/A public ImmutableDescriptor get(ImmutableDescriptor descriptor) {
0N/A WeakReference<ImmutableDescriptor> wr = map.get(descriptor);
0N/A ImmutableDescriptor got = (wr == null) ? null : wr.get();
0N/A if (got != null)
0N/A return got;
0N/A map.put(descriptor, new WeakReference<ImmutableDescriptor>(descriptor));
0N/A return descriptor;
0N/A }
0N/A
0N/A public ImmutableDescriptor union(Descriptor... descriptors) {
0N/A return get(ImmutableDescriptor.union(descriptors));
0N/A }
0N/A
0N/A private final static DescriptorCache instance = new DescriptorCache();
0N/A private final WeakHashMap<ImmutableDescriptor,
0N/A WeakReference<ImmutableDescriptor>>
0N/A map = new WeakHashMap<ImmutableDescriptor,
0N/A WeakReference<ImmutableDescriptor>>();
0N/A}