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