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Groovy: A powerful, dynamic language for the JVM

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/*
 * Copyright 2003-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.util;

/**
 * 
 * 
 * @author Alex Tkachman
 * @author Jochen Theodorou
 */
public class ManagedReference implements Finalizable {
    private static final ReferenceManager NULL_MANAGER = new ReferenceManager(null){};
    private final Reference> ref;
    private final ReferenceManager manager;
    
    public ManagedReference(ReferenceType type, ReferenceManager rmanager, T value) {
        if (rmanager==null) rmanager = NULL_MANAGER;
        this.manager = rmanager;
        this.ref = type.createReference(value, this, rmanager.getReferenceQueue());
        rmanager.afterReferenceCreation(ref);
    }
    
    public ManagedReference(ReferenceBundle bundle, T value) {
        this(bundle.getType(),bundle.getManager(),value);
    }
    
    public final T get() {
        return ref.get();
    }
    
    public final void clear() {
        ref.clear();
        manager.removeStallEntries();
    }
    
    public void finalizeReference(){
        clear();
    }
}