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//
// ========================================================================
// Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.annotations;
import java.util.ArrayList;
import java.util.List;
/**
* AnnotationIntrospector
*
*
*/
public class AnnotationIntrospector
{
protected List<IntrospectableAnnotationHandler> _handlers = new ArrayList<IntrospectableAnnotationHandler>();
/**
* IntrospectableAnnotationHandler
*
* Interface for all handlers that wish to introspect a class to find a particular annotation
*/
public interface IntrospectableAnnotationHandler
{
public void handle(Class<?> clazz);
}
/**
* AbstractIntrospectableAnnotationHandler
*
* Base class for handlers that introspect a class to find a particular annotation.
* A handler can optionally introspect the parent hierarchy of a class.
*/
public static abstract class AbstractIntrospectableAnnotationHandler implements IntrospectableAnnotationHandler
{
private boolean _introspectAncestors;
public abstract void doHandle(Class<?> clazz);
public AbstractIntrospectableAnnotationHandler(boolean introspectAncestors)
{
_introspectAncestors = introspectAncestors;
}
public void handle(Class<?> clazz)
{
Class<?> c = clazz;
//process the whole inheritance hierarchy for the class
while (c!=null && (!c.equals(Object.class)))
{
doHandle(c);
if (!_introspectAncestors)
break;
c = c.getSuperclass();
}
}
}
public void registerHandler (IntrospectableAnnotationHandler handler)
{
_handlers.add(handler);
}
public void introspect (Class<?> clazz)
{
if (_handlers == null)
return;
if (clazz == null)
return;
for (IntrospectableAnnotationHandler handler:_handlers)
{
try
{
handler.handle(clazz);
}
catch (RuntimeException e)
{
throw e;
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}
}
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