[weld-issues] [JBoss JIRA] Commented: (WELDX-95) Need common method of scanning for annotations (static or dynamic)

Need common method of scanning for annotations (static or dynamic) ------------------------------------------------------------------ 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; } }