/*
* Copyright 2002,2004 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.commons.jelly.tags.core;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.jelly.JellyException;
import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.MissingAttributeException;
import org.apache.commons.jelly.MapTagSupport;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.jelly.impl.BeanSource;
/**
* A tag which sets the bean properties on the given bean.
* So if you used it as follows, for example using the <j:new> tag.
* <pre>
* <j:new className="com.acme.Person" var="person"/>
* <j:setProperties object="${person}" name="James" location="${loc}"/>
* </pre>
* Then it would set the name and location properties on the bean denoted by
* the expression ${person}.
* <p>
* This tag can also be nested inside a bean tag such as the <useBean> tag
* or a JellySwing tag to set one or more properties, maybe inside some conditional
* logic.
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 1.3 $
*/
public class SetPropertiesTag extends MapTagSupport {
public SetPropertiesTag(){
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
Map attributes = getAttributes();
Object bean = attributes.remove( "object" );
if ( bean == null ) {
// lets try find a parent bean
BeanSource tag = (BeanSource) findAncestorWithClass(BeanSource.class);
if (tag != null) {
try {
bean = tag.getBean();
} catch (JellyException e) {
throw new JellyTagException(e);
}
}
if (bean == null) {
throw new MissingAttributeException("bean");
}
}
setBeanProperties(bean, attributes);
}
// Implementation methods
//-------------------------------------------------------------------------
/**
* Sets the properties on the bean. Derived tags could implement some custom
* type conversion etc.
*/
protected void setBeanProperties(Object bean, Map attributes) throws JellyTagException {
try {
BeanUtils.populate(bean, attributes);
} catch (IllegalAccessException e) {
throw new JellyTagException("could not set the properties on a bean",e);
} catch (InvocationTargetException e) {
throw new JellyTagException("could not set the properties on a bean",e);
}
}
}