/*
* Copyright 2002-2007 the original author or authors.
*
* 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.internna.iwebmvc.tags;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanWrapperImpl;
/**
* Determines if a path of a bean is not null at runtime and sets the result in the context.
*
* @author Jose Noheda
* @since 2.0
*/
public class Exists extends SimpleTagSupport {
protected Log logger = LogFactory.getLog(getClass());
private String path;
private Object entity;
private String property;
@Override public void doTag() throws JspException {
Boolean exists = Boolean.TRUE;
try {
new BeanWrapperImpl(entity).getPropertyValue(path);
} catch (Exception ex) {
exists = Boolean.FALSE;
}
if (logger.isDebugEnabled()) logger.debug("Property [" + path + "] of [" + entity + "] " + (exists ? "does not exist" : "exists"));
getJspContext().setAttribute(property, exists);
}
public void setPath(String path) {
this.path = path;
}
public void setEntity(Object entity) {
this.entity = entity;
}
public void setProperty(String property) {
this.property = property;
}
}