001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.bean; 016 017 import java.util.Map; 018 019 import ognl.ObjectPropertyAccessor; 020 import ognl.OgnlException; 021 022 import org.apache.tapestry.IBeanProvider; 023 024 /** 025 * Adapts a {@link org.apache.tapestry.IBeanProvider} to 026 * <a href="http://www.ognl.org">OGNL</a> by exposing the named 027 * beans provided by the provider as read-only properties of 028 * the provider. 029 * 030 * <p>This is registered by {@link org.apache.tapestry.AbstractComponent}. 031 * 032 * @author Howard Lewis Ship 033 * @since 2.2 034 * 035 **/ 036 037 public class BeanProviderPropertyAccessor extends ObjectPropertyAccessor 038 { 039 /** 040 * Checks to see if the name matches the name of a bean inside 041 * the provider and returns that bean if so. 042 * Otherwise, invokes the super implementation. 043 * 044 **/ 045 046 public Object getProperty(Map context, Object target, Object name) throws OgnlException 047 { 048 IBeanProvider provider = (IBeanProvider)target; 049 String beanName = (String)name; 050 051 if (provider.canProvideBean(beanName)) 052 return provider.getBean(beanName); 053 054 return super.getProperty(context, target, name); 055 } 056 057 /** 058 * Returns true if the name matches a bean provided by the provider. 059 * Otherwise invokes the super implementation. 060 * 061 **/ 062 063 public boolean hasGetProperty(Map context, Object target, Object oname) throws OgnlException 064 { 065 IBeanProvider provider = (IBeanProvider)target; 066 String beanName = (String)oname; 067 068 if (provider.canProvideBean(beanName)) 069 return true; 070 071 return super.hasGetProperty(context, target, oname); 072 } 073 074 }