| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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; |
| |
| import java.lang.ref.PhantomReference; |
| import java.lang.ref.ReferenceQueue; |
| import java.lang.ref.SoftReference; |
| import java.lang.ref.WeakReference; |
| |
| |
| public enum ReferenceType { |
| SOFT { |
| @Override |
| protected <T,V extends Finalizable> Reference<T,V> createReference(T value, V handler, ReferenceQueue queue) { |
| return new SoftRef(value, handler, queue); |
| } |
| }, |
| WEAK { |
| @Override |
| protected <T,V extends Finalizable> Reference<T,V> createReference(T value, V handler, ReferenceQueue queue) { |
| return new WeakRef(value, handler, queue); |
| } |
| }, |
| PHANTOM { |
| @Override |
| protected <T,V extends Finalizable> Reference<T,V> createReference(T value, V handler, ReferenceQueue queue) { |
| return new PhantomRef(value, handler, queue); |
| } |
| }, |
| HARD { |
| @Override |
| protected <T,V extends Finalizable> Reference<T,V> createReference(T value, V handler, ReferenceQueue queue) { |
| return new HardRef(value, handler, queue); |
| } |
| }; |
| protected abstract <T,V extends Finalizable> Reference<T,V> createReference(T value, V handler, ReferenceQueue queue); |
| |
| private static class SoftRef<TT,V extends Finalizable> extends SoftReference<TT> implements Reference<TT,V> { |
| private final V handler; |
| public SoftRef(TT referent, V handler, ReferenceQueue<? super TT> q) { |
| super(referent, q); |
| this.handler = handler; |
| } |
| public V getHandler() { |
| return handler; |
| } |
| } |
| |
| private static class WeakRef<TT,V extends Finalizable> extends WeakReference<TT> implements Reference<TT,V> { |
| private final V handler; |
| public WeakRef(TT referent, V handler, ReferenceQueue<? super TT> q) { |
| super(referent, q); |
| this.handler = handler; |
| } |
| public V getHandler() { |
| return handler; |
| } |
| } |
| |
| private static class PhantomRef<TT,V extends Finalizable> extends PhantomReference<TT> implements Reference<TT,V> { |
| private final V handler; |
| public PhantomRef(TT referent, V handler, ReferenceQueue<? super TT> q) { |
| super(referent, q); |
| this.handler = handler; |
| } |
| public V getHandler() { |
| return handler; |
| } |
| } |
| |
| private static class HardRef<TT,V extends Finalizable> implements Reference<TT,V> { |
| private TT ref; |
| private final V handler; |
| public HardRef(TT referent, V handler, ReferenceQueue<? super TT> q) { |
| this.ref = referent; |
| this.handler = handler; |
| } |
| public V getHandler() { |
| return handler; |
| } |
| public TT get() { |
| return ref; |
| } |
| public void clear() { |
| ref = null; |
| } |
| } |
| |
| } |