/*
* 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 java.lang.reflect.Field;
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.internna.iwebmvc.utils.ClassUtils;
import org.springframework.beans.BeansException;
/**
* Gets the generic type of a collection property of a bean.
*
* @author Jose Noheda
* @since 2.0
*/
public class GenericType extends SimpleTagSupport {
protected Log logger = LogFactory.getLog(getClass());
private String property;
private String path;
private Class<?> entityClass;
public void setEntityClass(Class<?> entityClass) {
this.entityClass = entityClass;
}
public void setPath(String path) {
this.path = path;
}
public void setProperty(String property) {
this.property = property;
}
private Field getField(Class<?> clazz, String path) throws BeansException, InstantiationException, IllegalAccessException {
return ClassUtils.getField(clazz, path);
}
@Override public void doTag() throws JspException {
try {
Field type = null;
for (String part : path.split("\\.")) type = getField(type == null ? entityClass : type.getType(), part);
Class<?> genericType = ClassUtils.getGenericType(type);
if (logger.isDebugEnabled()) logger.debug("Obtained generic type [" + type + "] for [" + entityClass + "." + path + "] collection");
getJspContext().setAttribute(property, genericType);
} catch (Exception ex) {
if (logger.isDebugEnabled()) logger.debug("Could not obtain the type of [" + path + "] in class [" + entityClass + "]: " + ex.getMessage());
}
}
}