| /******************************************************************************* |
| * 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; |
| } |
| } |