/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.deployers.plugins.annotations;
import java.lang.annotation.Annotation;
import java.lang.ref.SoftReference;
import java.lang.reflect.AnnotatedElement;
import org.jboss.deployers.spi.annotations.Element;
/**
* Abstract annotations element.
*
* @param <A> the annotation type
* @param <M> the annotated element type
* @author <a href="mailto:ales.justin@jboss.com">Ales Justin</a>
*/
public abstract class AbstractElement<A extends Annotation, M extends AnnotatedElement> extends WeakClassLoaderHolder implements Element<A, M>
{
protected String className;
protected Class<A> annClass;
private A annotation;
private SoftReference<Class<?>> classRef;
public AbstractElement(ClassLoader classLoader, String className, Class<A> annClass, A annotation)
{
super(classLoader);
if (className == null)
throw new IllegalArgumentException("Null className");
if (annClass == null)
throw new IllegalArgumentException("Null annotation class");
this.className = className;
this.annClass = annClass;
this.annotation = annotation;
}
public String getOwnerClassName()
{
return className;
}
public Class<?> getOwner()
{
if (classRef != null)
{
Class<?> clazz = classRef.get();
if (clazz != null)
return clazz;
}
Class<?> clazz = loadClass(className);
classRef = new SoftReference<Class<?>>(clazz);
return clazz;
}
public A getAnnotation()
{
if (annotation == null)
annotation = readAnnotation();
return annotation;
}
/**
* Read the annotation.
*
* @return the read annotation
*/
protected A readAnnotation()
{
AnnotatedElement annotatedElement = getAnnotatedElement();
return annotatedElement.getAnnotation(annClass);
}
public int getHashCode()
{
int hash = className.hashCode();
hash += 7 * annClass.hashCode();
if (annotation != null)
hash += 11 * annotation.hashCode();
return hash;
}
public boolean equals(Object obj)
{
if (obj == null || getClass().equals(obj.getClass()) == false)
return false;
AbstractElement<?, ?> ae = AbstractElement.class.cast(obj);
if (className.equals(ae.className) == false)
return false;
if (annClass.equals(ae.annClass) == false)
return false;
// we don't check annotation
// since I doubt classname + annClass + signature + aoClass is not enough
// the only way this could happen is probably if class was diff version - diff annotation values
return true;
}
}