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The runtime needed to execute a program using AspectJ
/* *******************************************************************
* 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:
* Adrian Colyer Initial implementation
* ******************************************************************/
package org.aspectj.lang.reflect;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import org.aspectj.internal.lang.reflect.AjTypeImpl;
/**
* This is the anchor for the AspectJ runtime type system.
* Typical usage to get the AjType representation of a given type
* at runtime is to call AjType<Foo> fooType = AjTypeSystem.getAjType(Foo.class);
*/
public class AjTypeSystem {
private static Map> ajTypes =
Collections.synchronizedMap(new WeakHashMap>());
/**
* Return the AspectJ runtime type representation of the given Java type.
* Unlike java.lang.Class, AjType understands pointcuts, advice, declare statements,
* and other AspectJ type members. AjType is the recommended reflection API for
* AspectJ programs as it offers everything that java.lang.reflect does, with
* AspectJ-awareness on top.
* @param the expected type associated with the returned AjType
* @param fromClass the class for which to discover the AjType
* @return the AjType corresponding to the input class
*/
public static AjType getAjType(Class fromClass) {
WeakReference weakRefToAjType = ajTypes.get(fromClass);
if (weakRefToAjType!=null) {
AjType theAjType = weakRefToAjType.get();
if (theAjType != null) {
return theAjType;
} else {
theAjType = new AjTypeImpl(fromClass);
ajTypes.put(fromClass, new WeakReference(theAjType));
return theAjType;
}
}
// neither key nor value was found
AjType theAjType = new AjTypeImpl(fromClass);
ajTypes.put(fromClass, new WeakReference(theAjType));
return theAjType;
}
}