--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2005 Contributors.
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * initial implementation Alexandre Vasseur
+ * generic signature update Adrian Colyer
+ *******************************************************************************/
+package org.aspectj.lang;
+
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Handles generic aspectOf method when those are not available in the aspects but added later on
+ * thru load time weaving.
+ * <p/>
+ * Aspects.aspectOf(..) is doing reflective calls to the aspect aspectOf, so for better performance
+ * consider using ajc compilation of the aspects and using them as a binary dependancies in your project.
+ *
+ * @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
+ */
+public class Aspects {
+
+ private final static Class[] EMPTY_CLASS_ARRAY = new Class[0];
+ private final static Class[] PEROBJECT_CLASS_ARRAY = new Class[]{Object.class};
+ private final static Class[] PERTYPEWITHIN_CLASS_ARRAY = new Class[]{Class.class};
+ private final static Object[] EMPTY_OBJECT_ARRAY = new Object[0];
+ private final static String ASPECTOF = "aspectOf";
+ private final static String HASASPECT = "hasAspect";
+
+ /**
+ * Returns the singleton aspect or the percflow / percflowbelow associated with the current thread
+ *
+ * @param aspectClass
+ * @return
+ * @throws NoAspectBoundException if no such aspect
+ */
+ public static <T> T aspectOf(Class<T> aspectClass) throws NoAspectBoundException {
+ try {
+ return (T) getSingletonOrThreadAspectOf(aspectClass).invoke(null, EMPTY_OBJECT_ARRAY);
+ } catch (InvocationTargetException e) {
+ //FIXME asc Highly temporary change to see what the build makes of it - dont use 1.4 APIs
+ throw new NoAspectBoundException(aspectClass.getName(), e);//e.getCause());
+ } catch (Exception e) {
+ throw new NoAspectBoundException(aspectClass.getName(), e);
+ }
+ }
+
+ /**
+ * Returns the perthis / pertarget aspect
+ * @param aspectClass
+ * @param perObject
+ * @return
+ * @throws NoAspectBoundException if no such aspect, or no aspect bound
+ */
+ public static <T> T aspectOf(Class<T> aspectClass, Object perObject) throws NoAspectBoundException {
+ try {
+ return (T) getPerObjectAspectOf(aspectClass).invoke(null, new Object[]{perObject});
+ } catch (InvocationTargetException e) {
+ //FIXME asc Highly temporary change to see what the build makes of it - dont use 1.4 APIs
+ throw new NoAspectBoundException(aspectClass.getName(), e);//e.getCause());
+ } catch (Exception e) {
+ throw new NoAspectBoundException(aspectClass.getName(), e);
+ }
+ }
+
+ /**
+ * Returns the pertypewithin aspect
+ * @param aspectClass
+ * @param perTypeWithin class
+ * @return
+ * @throws NoAspectBoundException if no such aspect, or no aspect bound
+ */
+ public static <T> T aspectOf(Class<T> aspectClass, Class<?> perTypeWithin) throws NoAspectBoundException {
+ try {
+ return (T) getPerTypeWithinAspectOf(aspectClass).invoke(null, new Object[]{perTypeWithin});
+ } catch (InvocationTargetException e) {
+// FIXME asc Highly temporary change to see what the build makes of it - dont use 1.4 APIs
+ throw new NoAspectBoundException(aspectClass.getName(), e);//e.getCause());
+ } catch (Exception e) {
+ throw new NoAspectBoundException(aspectClass.getName(), e);
+ }
+ }
+
+ /**
+ * Returns true if singleton aspect or percflow / percflowbelow aspect is bound
+ *
+ * @param aspectClass
+ * @return
+ * @throws NoAspectBoundException if not bound
+ */
+ public static boolean hasAspect(Class<?> aspectClass) throws NoAspectBoundException {
+ try {
+ return ((Boolean)getSingletonOrThreadHasAspect(aspectClass).invoke(null, EMPTY_OBJECT_ARRAY)).booleanValue();
+ } catch (Exception e) {
+ return false;
+ }
+ }
+
+ /**
+ * Returns true if the perthis / pertarget aspect is bound
+ * @param aspectClass
+ * @param perObject
+ * @return
+ * @throws NoAspectBoundException if not bound
+ */
+ public static boolean hasAspect(Class<?> aspectClass, Object perObject) throws NoAspectBoundException {
+ try {
+ return ((Boolean)getPerObjectHasAspect(aspectClass).invoke(null, new Object[]{perObject})).booleanValue();
+ } catch (Exception e) {
+ return false;
+ }
+ }
+
+ /**
+ * Returns true if the pertypewithin aspect is bound
+ * @param aspectClass
+ * @param perTypeWithin class
+ * @return
+ * @throws NoAspectBoundException if not bound
+ */
+ public static boolean hasAspect(Class<?> aspectClass, Class<?> perTypeWithin) throws NoAspectBoundException {
+ try {
+ return ((Boolean)getPerTypeWithinHasAspect(aspectClass).invoke(null, new Object[]{perTypeWithin})).booleanValue();
+ } catch (Exception e) {
+ return false;
+ }
+ }
+
+ // -- aspectOf
+
+ private static Method getSingletonOrThreadAspectOf(Class<?> aspectClass) throws NoSuchMethodException {
+ Method method = aspectClass.getDeclaredMethod(ASPECTOF, EMPTY_CLASS_ARRAY);
+ return checkAspectOf(method, aspectClass);
+ }
+
+ private static Method getPerObjectAspectOf(Class<?> aspectClass) throws NoSuchMethodException {
+ Method method = aspectClass.getDeclaredMethod(ASPECTOF, PEROBJECT_CLASS_ARRAY);
+ return checkAspectOf(method, aspectClass);
+ }
+
+ private static Method getPerTypeWithinAspectOf(Class<?> aspectClass) throws NoSuchMethodException {
+ Method method = aspectClass.getDeclaredMethod(ASPECTOF, PERTYPEWITHIN_CLASS_ARRAY);
+ return checkAspectOf(method, aspectClass);
+ }
+
+ private static Method checkAspectOf(Method method, Class<?> aspectClass) throws NoSuchMethodException {
+ method.setAccessible(true);
+ if (!method.isAccessible()
+ || !Modifier.isPublic(method.getModifiers())
+ || !Modifier.isStatic(method.getModifiers())) {
+ throw new NoSuchMethodException(aspectClass.getName() + ".aspectOf(..) is not accessible public static");
+ }
+ return method;
+ }
+
+ // -- hasAspect
+
+ private static Method getSingletonOrThreadHasAspect(Class aspectClass) throws NoSuchMethodException {
+ Method method = aspectClass.getDeclaredMethod(HASASPECT, EMPTY_CLASS_ARRAY);
+ return checkHasAspect(method, aspectClass);
+ }
+
+ private static Method getPerObjectHasAspect(Class aspectClass) throws NoSuchMethodException {
+ Method method = aspectClass.getDeclaredMethod(HASASPECT, PEROBJECT_CLASS_ARRAY);
+ return checkHasAspect(method, aspectClass);
+ }
+
+ private static Method getPerTypeWithinHasAspect(Class aspectClass) throws NoSuchMethodException {
+ Method method = aspectClass.getDeclaredMethod(HASASPECT, PERTYPEWITHIN_CLASS_ARRAY);
+ return checkHasAspect(method, aspectClass);
+ }
+
+ private static Method checkHasAspect(Method method, Class aspectClass) throws NoSuchMethodException {
+ method.setAccessible(true);
+ if (!method.isAccessible()
+ || !Modifier.isPublic(method.getModifiers())
+ || !Modifier.isStatic(method.getModifiers())) {
+ throw new NoSuchMethodException(aspectClass.getName() + ".hasAspect(..) is not accessible public static");
+ }
+ return method;
+ }
+}
projects / aspectj.git / commitdiff