| /* |
| * 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.apache.ode.jacob; |
| |
| import java.lang.reflect.Method; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Base-class for method-list objects. Method-lists objects should extends this |
| * class <em>and</em> implement one <code>Channel</code> interface. |
| */ |
| public abstract class ChannelListener<CT extends Channel> extends JacobObject { |
| private static Log __log = LogFactory.getLog(ChannelListener.class); |
| |
| private transient Set<Method> _implementedMethods; |
| |
| private transient CT _channel; |
| |
| protected ChannelListener(CT channel) throws IllegalStateException { |
| assert getClass().getSuperclass().getSuperclass() == ChannelListener.class : |
| "Inheritance in ChannelListener classes not allowed!"; |
| if (channel == null) { |
| throw new IllegalArgumentException("Null channel!"); |
| } |
| _channel = channel; |
| } |
| |
| public CT getChannel() { |
| return _channel; |
| } |
| |
| public void setChannel(CT channel) { |
| _channel = channel; |
| } |
| |
| public Set<ChannelListener> or(ChannelListener other) { |
| HashSet<ChannelListener> retval = new HashSet<ChannelListener>(); |
| retval.add(this); |
| retval.add(other); |
| return retval; |
| } |
| |
| public Set<ChannelListener> or(Set<ChannelListener> other) { |
| HashSet<ChannelListener> retval = new HashSet<ChannelListener>(other); |
| retval.add(this); |
| return retval; |
| } |
| |
| public Set<Method> getImplementedMethods() { |
| if (_implementedMethods == null) { |
| Set<Method> implementedMethods = new HashSet<Method>(); |
| getImplementedMethods(implementedMethods, getClass().getSuperclass()); |
| _implementedMethods = Collections.unmodifiableSet(implementedMethods); |
| } |
| return _implementedMethods; |
| } |
| |
| private static Set<Method> getImplementedMethods(Set<Method> methods, Class clazz) { |
| Class[] interfaces = clazz.getInterfaces(); |
| for (int i=0; i<interfaces.length; ++i) { |
| if (interfaces[i] != Channel.class) { |
| Method[] allmethods = interfaces[i].getDeclaredMethods(); |
| for (int j=0; j<allmethods.length; ++j) { |
| methods.add(allmethods[j]); |
| } |
| getImplementedMethods(methods, interfaces[i]); |
| } |
| } |
| return methods; |
| } |
| |
| /** |
| * Get a description of the object for debugging purposes. |
| * |
| * @return human-readable description. |
| */ |
| public String toString() { |
| StringBuffer buf = new StringBuffer(getClassName()); |
| buf.append('{'); |
| for (Method m : getImplementedMethods()) { |
| buf.append(m.getName()); |
| buf.append("()"); |
| buf.append("&"); |
| } |
| buf.setLength(buf.length()-1); |
| buf.append('}'); |
| return buf.toString(); |
| } |
| |
| protected Log log() { |
| return __log; |
| } |
| } |