// Copyright 2004, 2005 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.bean;
import java.util.Map;
import ognl.ObjectPropertyAccessor;
import ognl.OgnlException;
import org.apache.tapestry.IBeanProvider;
/**
* Adapts a {@link org.apache.tapestry.IBeanProvider} to
* <a href="http://www.ognl.org">OGNL</a> by exposing the named
* beans provided by the provider as read-only properties of
* the provider.
*
* <p>This is registered by {@link org.apache.tapestry.AbstractComponent}.
*
* @author Howard Lewis Ship
* @since 2.2
*
**/
public class BeanProviderPropertyAccessor extends ObjectPropertyAccessor
{
/**
* Checks to see if the name matches the name of a bean inside
* the provider and returns that bean if so.
* Otherwise, invokes the super implementation.
*
**/
public Object getProperty(Map context, Object target, Object name) throws OgnlException
{
IBeanProvider provider = (IBeanProvider)target;
String beanName = (String)name;
if (provider.canProvideBean(beanName))
return provider.getBean(beanName);
return super.getProperty(context, target, name);
}
/**
* Returns true if the name matches a bean provided by the provider.
* Otherwise invokes the super implementation.
*
**/
public boolean hasGetProperty(Map context, Object target, Object oname) throws OgnlException
{
IBeanProvider provider = (IBeanProvider)target;
String beanName = (String)oname;
if (provider.canProvideBean(beanName))
return true;
return super.hasGetProperty(context, target, oname);
}
}