/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Tapestry"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* or "Tapestry", nor may "Apache" or "Tapestry" appear in their
* name, without prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE TAPESTRY CONTRIBUTOR COMMUNITY
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.tapestry.bean;
import java.lang.reflect.Field;
import org.apache.tapestry.ApplicationRuntimeException;
import org.apache.tapestry.IBeanProvider;
import org.apache.tapestry.IResourceResolver;
import org.apache.tapestry.Tapestry;
/**
* Initializes a bean with the value of a public static field.
*
* @author Howard Lewis Ship
* @version $Id: FieldBeanInitializer.java,v 1.4 2003/05/28 13:41:39 hlship Exp $
* @since 1.0.8
*
**/
public class FieldBeanInitializer extends AbstractBeanInitializer
{
protected String _fieldName;
protected Object _fieldValue;
private boolean _fieldResolved = false;
public synchronized void setBeanProperty(IBeanProvider provider, Object bean)
{
IResourceResolver resolver = provider.getResourceResolver();
if (!_fieldResolved)
resolveField(resolver);
setBeanProperty(resolver, bean, _fieldValue);
}
private void resolveField(IResourceResolver resolver)
{
if (_fieldResolved)
return;
// This is all copied out of of FieldBinding!!
int dotx = _fieldName.lastIndexOf('.');
if (dotx < 0)
throw new ApplicationRuntimeException(
Tapestry.format("invalid-field-name", _fieldName));
String className = _fieldName.substring(0, dotx);
String simpleFieldName = _fieldName.substring(dotx + 1);
// Simple class names are assumed to be in the java.lang package.
if (className.indexOf('.') < 0)
className = "java.lang." + className;
Class targetClass = null;
try
{
targetClass = resolver.findClass(className);
}
catch (Throwable t)
{
throw new ApplicationRuntimeException(
Tapestry.format("unable-to-resolve-class", className),
t);
}
Field field = null;
try
{
field = targetClass.getField(simpleFieldName);
}
catch (NoSuchFieldException ex)
{
throw new ApplicationRuntimeException(
Tapestry.format("field-not-defined", _fieldName),
ex);
}
// Get the value of the field. null means look for it as a static
// variable.
try
{
_fieldValue = field.get(null);
}
catch (IllegalAccessException ex)
{
throw new ApplicationRuntimeException(
Tapestry.format("illegal-field-access", _fieldName),
ex);
}
catch (NullPointerException ex)
{
throw new ApplicationRuntimeException(
Tapestry.format("field-is-instance", _fieldName),
ex);
}
_fieldResolved = true;
}
}