70 lines
2.8 KiB
Java
70 lines
2.8 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Header:$
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*/
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package org.apache.beehive.controls.runtime.packaging;
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import java.beans.EventSetDescriptor;
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import java.beans.IntrospectionException;
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import java.beans.MethodDescriptor;
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import java.lang.ref.Reference;
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import java.lang.ref.SoftReference;
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import java.lang.reflect.Method;
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/**
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* The ControlEventSetDescriptor is a result of an infortunate evoluntary flaw in the
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* java.beans.EventSetDescriptor class. The getListeners functionality for event sets was
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* added after the initial implementation, and unfortunately, there is no constructor that
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* let you specify <b>both</b> the MethodDescriptors for events <b>and</b> the getListener
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* method. To compensate for this, we must subclass and provide our own getGetListenerMethod
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* implementation.
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*/
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public class ControlEventSetDescriptor extends EventSetDescriptor
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{
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/**
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* This constructor adds the getListenerMethod argument that is missing from the JDK!
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*/
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public ControlEventSetDescriptor(String eventSetName,
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Class<?> listenerType,
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MethodDescriptor[] listenerMethodDescriptors,
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Method addListenerMethod,
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Method removeListenerMethod,
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Method getListenerMethod)
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throws IntrospectionException
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{
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super(eventSetName, listenerType, listenerMethodDescriptors, addListenerMethod, removeListenerMethod);
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// Follow the same pattern as the JDK and store the method as a soft reference, so
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// the introspector (alone) won't prevent Class garbage collection.
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_getMethodRef = new SoftReference<Method>(getListenerMethod);
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}
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/**
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* Override the default implementation of getGetListenerMethod to return the method
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* provided in the constructor.
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*/
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public Method getGetListenerMethod()
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{
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if (_getMethodRef == null)
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return null;
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return _getMethodRef.get();
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}
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Reference<Method> _getMethodRef;
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}
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