/*
* JBoss, Home of Professional Open Source
* Copyright 2005, 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.annotation.factory.javassist;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Map;
import org.jboss.annotation.factory.AnnotationValidationException;
import org.jboss.annotation.factory.AnnotationValidator;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.NotFoundException;
import javassist.bytecode.AnnotationDefaultAttribute;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.annotation.MemberValue;
import javassist.scopedpool.ScopedClassPoolRepository;
import javassist.scopedpool.ScopedClassPoolRepositoryImpl;
/**
* Validates if all attributes have been filled in for an annotation.
* Attempts to read default values where they exist
*
* @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
* @version $Revision: 69888 $
*/
public class DefaultValueAnnotationValidator implements AnnotationValidator
{
ScopedClassPoolRepository repository = ScopedClassPoolRepositoryImpl.getInstance();
public void validate(Map<String, Object> map, Class<?> annotation)
{
ArrayList<String> notAssignedAttributes = null;
CtClass ctClass = null;
Method[] methods = getDeclaredMethods(annotation);
for (int i = 0 ; i < methods.length ; i++)
{
if (map.get(methods[i].getName()) == null)
{
if (ctClass == null)
{
ctClass = getCtClass(annotation);
}
CtMethod method;
try
{
method = ctClass.getDeclaredMethod(methods[i].getName());
}
catch (NotFoundException e)
{
throw new RuntimeException("Unable to find method " + methods[i].getName() + " for " + annotation.getName());
}
Object defaultValue = null;
MethodInfo minfo = method.getMethodInfo2();
AnnotationDefaultAttribute defAttr = (AnnotationDefaultAttribute)minfo.getAttribute(AnnotationDefaultAttribute.tag);
if (defAttr != null)
{
MemberValue value = defAttr.getDefaultValue(); // default value of age
MemberValueGetter getter = new MemberValueGetter(methods[i]);
value.accept(getter);
defaultValue = getter.getValue();
}
if (defaultValue != null)
{
map.put(methods[i].getName(), defaultValue);
}
else
{
if (notAssignedAttributes == null)
{
notAssignedAttributes = new ArrayList<String>();
}
notAssignedAttributes.add(methods[i].getName());
}
}
}
if (notAssignedAttributes != null)
{
throw new AnnotationValidationException("Unable to fill in default attributes for " + annotation + " " + notAssignedAttributes);
}
}
CtClass getCtClass(Class<?> clazz)
{
try
{
ClassPool pool = repository.findClassPool(clazz.getClassLoader());
return pool.get(clazz.getName());
}
catch (NotFoundException e)
{
throw new RuntimeException("Unable to load CtClass for " + clazz, e);
}
}
private Method[] getDeclaredMethods(final Class<?> clazz)
{
return AccessController.doPrivileged(new PrivilegedAction<Method[]>()
{
public Method[] run()
{
return clazz.getDeclaredMethods();
};
});
}
}