org.aspectj.weaver/source/org/aspectj/weaver/tools/PointcutExpression.java

/* *******************************************************************
 * Copyright (c) 2004 IBM Corporation.
 * 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://www.eclipse.org/legal/epl-v10.html 
 *  
 * ******************************************************************/

package org.aspectj.weaver.tools;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;

/**
 * Represents an AspectJ pointcut expression and provides convenience methods to determine
 * whether or not the pointcut matches join points specified in terms of the
 * java.lang.reflect interfaces.
 */
public interface PointcutExpression {

	/**
	 * Set the matching context to be used for
	 * subsequent calls to match.
	 * @see MatchingContext
	 */
	void setMatchingContext(MatchingContext aMatchContext);
	
	/**
	 * Determine whether or not this pointcut could ever match a join point in the given class.
	 * @param aClass  the candidate class
	 * @return true iff this pointcut <i>may</i> match a join point within(aClass), and false otherwise 
	 */
	boolean couldMatchJoinPointsInType(Class aClass);
	
	/**
	 * Returns true iff this pointcut contains any expression that might necessitate a dynamic test
	 * at some join point (e.g. args)
	 */
	boolean mayNeedDynamicTest();
	
	/**
	 * Determine whether or not this pointcut matches the execution of a given method.
	 * @param aMethod the method being executed
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing the execution of the method. 
	 */
	ShadowMatch matchesMethodExecution(Method aMethod );
	
	/**
	 * Determine whether or not this pointcut matches the execution of a given constructor.
	 * @param aConstructor the constructor being executed
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing the execution of the constructor. 
	 */
	ShadowMatch matchesConstructorExecution(Constructor aConstructor);

	/**
	 * Determine whether or not this pointcut matches the static initialization
	 * of the given class.
	 * @param aClass the class being statically initialized
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matchs join points representing the static initialization of the given type
	 */
	ShadowMatch matchesStaticInitialization(Class aClass);
	
	/**
	 * Determine whether or not this pointcut matches the execution of a given piece of advice.
	 * @param anAdviceMethod a method representing the advice being executed
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing the execution of the advice. 
	 */		
	ShadowMatch matchesAdviceExecution(Method anAdviceMethod);
	
	/**
	 * Determine whether or not this pointcut matches the initialization of an
	 * object initiated by a call to the given constructor.
	 * @param aConstructor the constructor initiating the initialization
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing initialization via the given constructor. 
	 */	
	ShadowMatch matchesInitialization(Constructor aConstructor);
	
	/**
	 * Determine whether or not this pointcut matches the pre-initialization of an
	 * object initiated by a call to the given constructor.
	 * @param aConstructor the constructor initiating the initialization
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing pre-initialization via the given constructor. 
	 */	
	ShadowMatch matchesPreInitialization(Constructor aConstructor);
	
	/**
	 * Determine whether or not this pointcut matches a method call to the given method, made during 
	 * the execution of the given method or constructor.
	 * @param aMethod the method being called
	 * @param withinCode the Method or Constructor from within which the call is made
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing a call to this method during the execution of the given member.
	 */
	ShadowMatch matchesMethodCall(Method aMethod, Member withinCode);

	/**
	 * Determine whether or not this pointcut matches a method call to the given method, made outside 
	 * of the scope of any method or constructor, but within the callerType (for example, during
	 * static initialization of the type).
	 * @param aMethod the method being called
	 * @param callerType the declared type of the caller
	 * @param receiverType the declared type of the recipient of the call
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing a call to this method during the execution of the given member.
	 */
	ShadowMatch matchesMethodCall(Method aMethod, Class callerType);

	/**
	 * Determine whether or not this pointcut matches a method call to the given constructor, made during 
	 * the execution of the given method or constructor.
	 * @param aConstructor the constructor being called
	 * @param withinCode the Method or Constructor from within which the call is made
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing a call to this constructor during the execution of the given member.
	 */
	ShadowMatch matchesConstructorCall(Constructor aConstructor, Member withinCode);

	/**
	 * Determine whether or not this pointcut matches a method call to the given constructor, made outside 
	 * of the scope of any method or constructor, but within the callerType.
	 * @param aConstructor the cosstructor being called
	 * @param callerType the declared type of the caller
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or never
	 * matches join points representing a call to this constructor during the execution of the given member.
	 */
	ShadowMatch matchesConstructorCall(Constructor aConstructor, Class callerType);

	/**
	 * Determine whether or not this pointcut matches the execution of a given exception
	 * handler within the given method or constructor
	 * @param exceptionType the static type of the exception being handled
	 * @param withinCode the method or constructor in which the catch block is declared
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or 
	 * never matches join points representing the handling of the given exception
	 */	
	ShadowMatch matchesHandler(Class exceptionType, Member withinCode);
	
	/**
	 * Determine whether or not this pointcut matches the execution of a given exception
	 * handler outside of the scope of any method or constructor, but within the handling type.
	 * @param exceptionType the static type of the exception being handled
	 * @param handlingType the type in which the handler block is executing
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or 
	 * never matches join points representing the handling of the given exception
	 */	
	ShadowMatch matchesHandler(Class exceptionType, Class handlingType);
	
	/**
	 * Determine whether or not this pointcut matches a set of the given field from within the given
	 * method or constructor.
	 * @param aField the field being updated
	 * @param withinCode the Method or Constructor owning the call site
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or
	 * never matches field set join points for the given field and call site.
	 */
	ShadowMatch matchesFieldSet(Field aField, Member withinCode);
	
	/**
	 * Determine whether or not this pointcut matches a set of the given field outside of the
	 * scope of any method or constructor, but within the given type (for example, during
	 * static initialization).
	 * @param aField the field being updated
	 * @param withinType the type owning the call site
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or
	 * never matches field set join points for the given field and call site.
	 */
	ShadowMatch matchesFieldSet(Field aField, Class withinType);
	
	/**
	 * Determine whether or not this pointcut matches a get of the given field from within the given
	 * method or constructor.
	 * @param aField the field being updated
	 * @param withinCode the Method or Constructor owning the call site
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or
	 * never matches field get join points for the given field and call site.
	 */
	ShadowMatch matchesFieldGet(Field aField, Member withinCode);

	/**
	 * Determine whether or not this pointcut matches a get of the given field outside of the
	 * scope of any method or constructor, but within the given type (for example, during
	 * static initialization).
	 * @param aField the field being accessed
	 * @param withinType the type owning the call site
	 * @return a ShadowMatch indicating whether the pointcut always, sometimes, or
	 * never matches field get join points for the given field and call site.
	 */
	ShadowMatch matchesFieldGet(Field aField, Class withinType);
	
	/**
	 * Return a string representation of this pointcut expression.
	 */
	String getPointcutExpression();
}