2:35 p.m.
Need common method of scanning for annotations (static or dynamic)
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Key: WELDX-95
URL: https://jira.jboss.org/jira/browse/WELDX-95
Project: Weld Extensions
Issue Type: Feature Request
Components: Weld Extensions
Reporter: Lincoln Baxter III
There needs to be a common way of scanning classes and methods for annotation information:
A Utility class for common @{@link Annotation} scanning operations. Enables scanning
classes and methods for specific annotation types, and retrieving those annotation
instances.
Here is the solution currently being used in Faces Module -- it still needs a call to the
BeanManager.getStereotypeDefinition(...) in order to be fully portable.
----------------------
package org.jboss.weld.extensions.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import javax.enterprise.inject.Stereotype;
/**
* Utility class for common @{@link Annotation} scanning operations. Enables
* scanning classes and methods for specific annotation types, and retrieving
* those annotation instances.
* <p>
*
* @author <a href="mailto:lincolnbaxter@gmail.com>Lincoln Baxter,
III</a>
*
*/
public class Annotations
{
/**
* Discover if a Method <b>m</b> has been annotated with
<b>type</b>. This
* also discovers annotations defined through a @{@link Stereotype}.
*
* @param m The method to inspect.
* @param type The targeted annotation class
*
* @return True if annotation is present either on the method itself, or on
* the declaring class of the method. Returns false if the annotation
* is not present.
*/
public static boolean has(final Method m, final Class<? extends Annotation>
type)
{
boolean result = false;
if (m.isAnnotationPresent(type))
{
result = true;
}
else
{
for (Annotation a : m.getAnnotations())
{
if (a.annotationType().isAnnotationPresent(type))
{
result = true;
}
}
}
if (result == false)
{
result = has(m.getDeclaringClass(), type);
}
return result;
}
/**
* Discover if a Class <b>c</b> has been annotated with
<b>type</b>. This
* also discovers annotations defined through a @{@link Stereotype}.
*
* @param c The class to inspect.
* @param type The targeted annotation class
*
* @return True if annotation is present either on class, false if the
* annotation is not present.
*/
public static boolean has(final Class<?> c, final Class<? extends
Annotation> type)
{
boolean result = false;
if (c.isAnnotationPresent(type))
{
result = true;
}
else
{
for (Annotation a : c.getAnnotations())
{
if (a.annotationType().isAnnotationPresent(type))
{
result = true;
}
}
}
return result;
}
/**
* Inspect method <b>m</b> for a specific <b>type</b> of
annotation. This
* also discovers annotations defined through a @ {@link Stereotype}.
*
* @param m The method to inspect.
* @param type The targeted annotation class
*
* @return The annotation instance found on this method or enclosing class,
* or null if no matching annotation was found.
*/
public static <A extends Annotation> A get(final Method m, final Class<A>
type)
{
A result = m.getAnnotation(type);
if (result == null)
{
for (Annotation a : m.getAnnotations())
{
if (a.annotationType().isAnnotationPresent(type))
{
result = a.annotationType().getAnnotation(type);
}
}
}
if (result == null)
{
result = get(m.getDeclaringClass(), type);
}
return result;
}
/**
* Inspect class <b>c</b> for a specific <b>type</b> of
annotation. This also
* discovers annotations defined through a @ {@link Stereotype}.
*
* @param c The class to inspect.
* @param type The targeted annotation class
*
* @return The annotation instance found on this class, or null if no
* matching annotation was found.
*/
public static <A extends Annotation> A get(final Class<?> c, final
Class<A> type)
{
A result = c.getAnnotation(type);
if (result == null)
{
for (Annotation a : c.getAnnotations())
{
if (a.annotationType().isAnnotationPresent(type))
{
result = a.annotationType().getAnnotation(type);
}
}
}
return result;
}
}
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