// 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 org.apache.hivemind.ApplicationRuntimeException;
import org.apache.tapestry.IBeanProvider;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.services.ExpressionEvaluator;
/**
* Initializes a helper bean property from an OGNL expression (relative to the bean's
* {@link IComponent}).
*
* @author Howard Lewis Ship
* @since 2.2
*/
public class ExpressionBeanInitializer extends AbstractBeanInitializer
{
protected String _expression;
private final ExpressionEvaluator _evaluator;
public ExpressionBeanInitializer(ExpressionEvaluator evaluator)
{
_evaluator = evaluator;
}
public void setBeanProperty(IBeanProvider provider, Object bean)
{
IComponent component = provider.getComponent();
try
{
Object value = _evaluator.read(component, _expression);
setBeanProperty(bean, value);
}
catch (Exception ex)
{
throw new ApplicationRuntimeException(ex.getMessage(), getLocation(), ex);
}
}
/** @since 3.0 * */
public String getExpression()
{
return _expression;
}
/** @since 3.0 * */
public void setExpression(String expression)
{
_expression = expression;
}
}