/*
* 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.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.util.List;
import java.util.ArrayList;
import javassist.ClassPool;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.CtConstructor;
import javassist.CtMember;
import javassist.CtMethod;
import javassist.NotFoundException;
import org.jboss.classloading.spi.visitor.ClassFilter;
import org.jboss.classloading.spi.visitor.ResourceContext;
import org.jboss.classloading.spi.visitor.ResourceFilter;
import org.jboss.classloading.spi.visitor.ResourceVisitor;
import org.jboss.deployers.spi.annotations.AnnotationEnvironment;
import org.jboss.logging.Logger;
import org.jboss.metadata.spi.signature.Signature;
import org.jboss.metadata.spi.signature.javassist.JavassistConstructorParametersSignature;
import org.jboss.metadata.spi.signature.javassist.JavassistMethodParametersSignature;
import org.jboss.metadata.spi.signature.javassist.JavassistSignatureFactory;
/**
* Generic annotation scanner deployer.
*
* @author <a href="mailto:ales.justin@jboss.com">Ales Justin</a>
*/
public class GenericAnnotationResourceVisitor implements ResourceVisitor
{
private static final Logger log = Logger.getLogger(GenericAnnotationResourceVisitor.class);
private ResourceFilter resourceFilter = ClassFilter.INSTANCE;
private ClassPool pool;
private boolean forceAnnotations;
private boolean checkInterfaces;
private DefaultAnnotationEnvironment env;
private CtClass objectCtClass;
public GenericAnnotationResourceVisitor(ClassLoader classLoader)
{
this(ClassPool.getDefault(), classLoader);
}
public GenericAnnotationResourceVisitor(ClassPool pool, ClassLoader classLoader)
{
if (pool == null)
throw new IllegalArgumentException("Null pool");
if (classLoader == null)
throw new IllegalArgumentException("Null classloader");
this.pool = pool;
this.env = new DefaultAnnotationEnvironment(classLoader);
this.objectCtClass = pool.makeClass(Object.class.getName());
this.checkInterfaces = true;
}
public ResourceFilter getFilter()
{
return resourceFilter;
}
public void visit(ResourceContext resource)
{
try
{
InputStream stream = resource.getInputStream();
if (stream == null)
throw new IllegalArgumentException("Null resource input stream: " + resource);
try
{
CtClass ctClass = pool.makeClass(stream);
try
{
List<CommitElement> commit = new ArrayList<CommitElement>();
handleCtClass(ctClass, commit);
for (CommitElement ce : commit)
{
env.putAnnotation(ce.getAnnotation(), ce.getType(), ce.getClassName(), ce.getSignature());
}
}
finally
{
ctClass.detach();
}
}
finally
{
try
{
stream.close();
}
catch (IOException ignored)
{
}
}
}
catch (ClassNotFoundException e)
{
if (forceAnnotations)
throw new RuntimeException(e);
logThrowable(resource, e);
}
catch (Throwable t)
{
logThrowable(resource, t);
}
}
/**
* Log throwable.
*
* @param resource the resource we're visiting
* @param t the throwable
*/
protected void logThrowable(ResourceContext resource, Throwable t)
{
if (log.isTraceEnabled())
log.trace("Exception reading resource: " + resource.getResourceName(), t);
}
/**
* Handle CtClass for annotations.
*
* @param ctClass the ct class instance
* @param commit the commit list
* @throws ClassNotFoundException for any annotations lookup problems
* @throws NotFoundException for any annotations lookup problems
*/
protected void handleCtClass(CtClass ctClass, List<CommitElement> commit) throws ClassNotFoundException, NotFoundException
{
if (ctClass == null || objectCtClass.equals(ctClass))
return;
if (checkInterfaces == false && ctClass.isInterface())
{
if (log.isTraceEnabled())
log.trace("Skipping interface: " + ctClass.getName());
return;
}
String className = ctClass.getName();
if (log.isTraceEnabled())
log.trace("Scanning class " + className + " for annotations");
Object[] annotations = forceAnnotations ? ctClass.getAnnotations() : ctClass.getAvailableAnnotations();
handleAnnotations(ElementType.TYPE, (Signature)null, annotations, className, commit);
handleCtMembers(ElementType.CONSTRUCTOR, ctClass.getDeclaredConstructors(), className, commit);
handleCtMembers(ElementType.METHOD, ctClass.getDeclaredMethods(), className, commit);
handleCtMembers(ElementType.FIELD, ctClass.getDeclaredFields(), className, commit);
if (checkInterfaces)
{
// interfaces
CtClass[] interfaces = ctClass.getInterfaces();
if (interfaces != null && interfaces.length > 0)
{
for (CtClass intf : interfaces)
handleCtClass(intf, commit);
}
}
// super class
handleCtClass(ctClass.getSuperclass(), commit);
}
/**
* Handle CtMembers for annotations.
*
* @param type where we found the annotations
* @param members the ct member instances
* @param className the className
* @param commit the commit list
* @throws ClassNotFoundException for any annotations lookup problems
*/
protected void handleCtMembers(ElementType type, CtMember[] members, String className, List<CommitElement> commit) throws ClassNotFoundException
{
if (members != null && members.length > 0)
{
for (CtMember member : members)
{
Object[] annotations = forceAnnotations ? member.getAnnotations() : member.getAvailableAnnotations();
handleAnnotations(type, member, annotations, className, commit);
if (member instanceof CtBehavior)
{
CtBehavior behavior = (CtBehavior)member;
Object[][] paramAnnotations = forceAnnotations ? behavior.getParameterAnnotations() : behavior.getAvailableParameterAnnotations();
for (int index = 0; index < paramAnnotations.length; index++)
{
handleAnnotations(ElementType.PARAMETER, getBehaviorSignature(behavior, index), paramAnnotations[index], className, commit);
}
}
}
}
}
/**
* Get parameters signature.
*
* @param behavior the ct behavior
* @param index the index
* @return parameters signature
* @throws ClassNotFoundException for any error
*/
protected static Signature getBehaviorSignature(CtBehavior behavior, int index) throws ClassNotFoundException
{
try
{
if (behavior instanceof CtConstructor)
return new JavassistConstructorParametersSignature((CtConstructor)behavior, index);
else if (behavior instanceof CtMethod)
return new JavassistMethodParametersSignature((CtMethod)behavior, index);
else
throw new IllegalArgumentException("Unknown ct behavior: " + behavior);
}
catch (NotFoundException e)
{
throw new ClassNotFoundException("Exception creating signature: " + behavior, e);
}
}
/**
* Handle annotations.
*
* @param type where we found the annotations
* @param member the ct member
* @param annotations the actual annotations
* @param className the className
* @param commit the commit list
*/
protected static void handleAnnotations(ElementType type, CtMember member, Object[] annotations, String className, List<CommitElement> commit)
{
Signature signature = null;
if (member != null)
signature = JavassistSignatureFactory.getSignature(member);
handleAnnotations(type, signature, annotations, className, commit);
}
/**
* Handle annotations.
*
* @param type where we found the annotations
* @param signature the signature
* @param annotations the actual annotations
* @param className the className
* @param commit the commit list
*/
protected static void handleAnnotations(ElementType type, Signature signature, Object[] annotations, String className, List<CommitElement> commit)
{
if (annotations != null && annotations.length > 0)
{
for (Object annObject : annotations)
{
Annotation annotation = Annotation.class.cast(annObject);
commit.add(new CommitElement(annotation, type, className, signature));
}
}
}
/**
* Set the resource filter.
*
* @param resourceFilter the resource filter
*/
public void setResourceFilter(ResourceFilter resourceFilter)
{
this.resourceFilter = resourceFilter;
}
/**
* Should we force all annotations to be available.
*
* @param forceAnnotations the force annotations flag
*/
public void setForceAnnotations(boolean forceAnnotations)
{
this.forceAnnotations = forceAnnotations;
}
/**
* Set the keep annotations flag.
*
* @param keepAnnotations the keep annotations flag
*/
public void setKeepAnnotations(boolean keepAnnotations)
{
env.setKeepAnnotations(keepAnnotations);
}
/**
* Should we check interfaces for annotations as well.
*
* @param checkInterfaces the check interfaces flag
*/
public void setCheckInterfaces(boolean checkInterfaces)
{
this.checkInterfaces = checkInterfaces;
}
/**
* Get the built environment.
*
* @return the annoattion environment
*/
public AnnotationEnvironment getEnv()
{
return env;
}
}