| // Copyright 2004 The Apache Software Foundation |
| // |
| // 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.apache.tapestry.listener; |
| |
| import java.util.Map; |
| |
| import ognl.ObjectPropertyAccessor; |
| import ognl.OgnlException; |
| |
| /** |
| * Exposes {@link org.apache.tapestry.IActionListener} listeners |
| * provided by the {@link ListenerMap} as read-only properties |
| * of the ListenerMap. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 2.2 |
| * |
| **/ |
| |
| public class ListenerMapPropertyAccessor extends ObjectPropertyAccessor |
| { |
| /** |
| * Checks to see if the ListenerMap provides the named |
| * listener, returning the listener if it does. Otherwise, |
| * invokes the super implementation. |
| * |
| **/ |
| |
| public Object getProperty(Map context, Object target, Object name) throws OgnlException |
| { |
| ListenerMap map = (ListenerMap) target; |
| String listenerName = (String) name; |
| |
| if (map.canProvideListener(listenerName)) |
| return map.getListener(listenerName); |
| |
| return super.getProperty(context, target, name); |
| } |
| |
| /** |
| * Returns true if the ListenerMap contains the named listener, |
| * otherwise invokes super-implementation. |
| * |
| **/ |
| |
| public boolean hasGetProperty(Map context, Object target, Object oname) throws OgnlException |
| { |
| ListenerMap map = (ListenerMap) target; |
| String listenerName = (String) oname; |
| |
| if (map.canProvideListener(listenerName)) |
| return true; |
| |
| return super.hasGetProperty(context, target, oname); |
| } |
| |
| } |