org.cobraparser.js.JavaClassWrapperFactory Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of Cobra Show documentation
Show all versions of Cobra Show documentation
Cobra is the rendering engine designed for LoboBrowser
/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: [email protected]
*/
package org.cobraparser.js;
import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.WeakHashMap;
public class JavaClassWrapperFactory {
private static JavaClassWrapperFactory instance;
private final Map, WeakReference> classWrappers = new WeakHashMap<>();
private JavaClassWrapperFactory() {
}
public static JavaClassWrapperFactory getInstance() {
if (instance == null) {
synchronized (JavaClassWrapperFactory.class) {
if (instance == null) {
instance = new JavaClassWrapperFactory();
}
}
}
return instance;
}
public JavaClassWrapper getClassWrapper(final Class clazz) {
synchronized (this) {
// WeakHashMaps where the value refers to
// the key will retain keys. Must make it
// refer to the value weakly too.
final WeakReference jcwr = this.classWrappers.get(clazz);
JavaClassWrapper jcw = null;
if (jcwr != null) {
jcw = (JavaClassWrapper) jcwr.get();
}
if (jcw == null) {
// TODO: need to check with the class shutter here. GH #136
jcw = new JavaClassWrapper(clazz);
this.classWrappers.put(clazz, new WeakReference<>(jcw));
}
return jcw;
}
}
}