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The AspectJ weaver applies aspects to Java classes. It can be used as a Java agent in order to apply load-time
weaving (LTW) during class-loading and also contains the AspectJ runtime classes.
/*******************************************************************************
* Copyright (c) 2005 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v 2.0
* which accompanies this distribution and is available at
* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
*
* 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.
* 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 dependencies in your project.
*
* @author Alexandre Vasseur
*/
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";
/**
* @param the expected class of the aspect
* @param aspectClass the aspect class
* @return the singleton aspect or the percflow / percflowbelow associated with the current thread
* @throws NoAspectBoundException if no such aspect
*/
public static T aspectOf(Class 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);
}
}
/**
* @param the expected class of the aspect
* @param aspectClass the aspect class
* @param perObject the this/target object for which to look for an aspect instance
* @return the associated perthis / pertarget aspect instance
* @throws NoAspectBoundException if no such aspect, or no aspect bound
*/
public static T aspectOf(Class 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);
}
}
/**
* @param the expected class of the aspect
* @param aspectClass the aspect class
* @param perTypeWithin the class for which to search for an aspect instance
* @return the associated aspect instance
* @throws NoAspectBoundException if no such aspect, or no aspect bound
*/
public static T aspectOf(Class 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);
}
}
/**
* @param aspectClass the aspect class
* @return true if singleton aspect or percflow / percflowbelow aspect is bound
* @throws NoAspectBoundException if not bound
*/
public static boolean hasAspect(Class aspectClass) throws NoAspectBoundException {
try {
return (Boolean) getSingletonOrThreadHasAspect(aspectClass).invoke(null, EMPTY_OBJECT_ARRAY);
} catch (Exception e) {
return false;
}
}
/**
* @param aspectClass the aspect class
* @param perObject the this/target object for which to look for an aspect instance
* @return true if the perthis / pertarget aspect is bound
* @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});
} catch (Exception e) {
return false;
}
}
/**
* @param aspectClass the aspect class
* @param perTypeWithin class
* @return true if the pertypewithin aspect is bound
* @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});
} 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;
}
}
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