abc.weaving.aspectinfo
Class TargetVar

java.lang.Object
  abc.weaving.aspectinfo.Syntax
      abc.weaving.aspectinfo.Pointcut
          abc.weaving.aspectinfo.DynamicValuePointcut
              abc.weaving.aspectinfo.TargetAny
                  abc.weaving.aspectinfo.TargetVar

public class TargetVar
extends TargetAny

Handler for target condition pointcut with a variable argument.

Author:

Aske Simon Christensen, Ganesh Sittampalam, Damien Sereni

Nested Class Summary

Nested classes/interfaces inherited from class abc.weaving.aspectinfo.Pointcut

Pointcut.DNF

Constructor Summary

TargetVar(Var var, Position pos)

Method Summary

void	getFreeVars(java.util.Set result) Get a list of free variables bound by this pointcut
Var	getVar() Get the pointcut variable that is bound by this target pointcut.
protected Pointcut	inline(java.util.Hashtable renameEnv, java.util.Hashtable typeEnv, Aspect context, int cflowdepth) Inlining should remove all PointcutRefs, and return a pointcut that is alpha-renamed
protected Residue	matchesAt(WeavingEnv we, ContextValue cv)
java.lang.String	toString() Subclasses must define toString, for debugging purposes
boolean	unify(Pointcut otherpc, Unification unification) Attempt to unify two pointcuts. pc.unify(pc', unification) should return true if the pointcuts can be unified, and set the renamings appropriately in unification.

Methods inherited from class abc.weaving.aspectinfo.TargetAny

matchesAt, registerSetupAdvice

Methods inherited from class abc.weaving.aspectinfo.Pointcut

dnf, freshVar, normalize

Methods inherited from class abc.weaving.aspectinfo.Syntax

getPosition

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TargetVar

public TargetVar(Var var,
                 Position pos)

Method Detail

getVar

public Var getVar()

Get the pointcut variable that is bound by this target pointcut.

toString

public java.lang.String toString()

Description copied from class: Pointcut

Subclasses must define toString, for debugging purposes

Overrides:

toString in class TargetAny

matchesAt

protected Residue matchesAt(WeavingEnv we,
                            ContextValue cv)

Overrides:

matchesAt in class TargetAny

inline

protected Pointcut inline(java.util.Hashtable renameEnv,
                          java.util.Hashtable typeEnv,
                          Aspect context,
                          int cflowdepth)

Description copied from class: Pointcut

Inlining should remove all PointcutRefs, and return a pointcut that is alpha-renamed

Overrides:

inline in class DynamicValuePointcut

Parameters:

renameEnv - A mapping from pointcut names to the Vars they should be renamed to. If a name isn't in the map, it doesn't need to be renamed.

typeEnv - A mapping from pointcut names to AbcTypes. Every variable that can appear free in the pointcut must be listed. The names are those before any renaming takes place.

context - The Aspect in which the root pointcut is defined. This is required because references to abstract pointcuts must be resolved to the concrete pointcut using this aspect.

cflowdepth - The number of surrounding cflows. This is required to determine the correct precedence for the synthetic advice used to implement cflow.

Returns:

The inlined pointcut

getFreeVars

public void getFreeVars(java.util.Set result)

Description copied from class: Pointcut

Get a list of free variables bound by this pointcut

Overrides:

getFreeVars in class TargetAny

Parameters:

result - The results should be placed in this set (having it as a parameter allows it to be built up incrementally, which is more efficient than repeatedly taking the union of sets)

unify

public boolean unify(Pointcut otherpc,
                     Unification unification)

Description copied from class: Pointcut

Attempt to unify two pointcuts. pc.unify(pc', unification) should return true if the pointcuts can be unified, and set the renamings appropriately in unification. There are two cases for unification: if unification.unifyWithFirst() is true, then the unification should only succeed if this pc can be renamed to pc', with the unification pointcut equal to this. Otherwise, the unification pointcut can be anything, as long as it can be renamed both to this and pc'.

A default implementation is provided, but all subclasses should override this - otherwise cflow CSE will be disabled for cflow that use these pointcuts.

Typical implementations for pointcuts that introduce no free variables are straightforward (see the And pointcut, for example). For pointcuts that introduce free variables, the Var.unify method is used to actually update the renamings (see the Args pointcut).

Overrides:

unify in class TargetAny

Parameters:

otherpc - the pointcut that should be unify with this

unification - the Unification that should be set.

Returns:

true iff the unification is succesful. If true is returned, then Unification.setPointcut(the unified pointcut) must have been called in the body of unify().

See Also:

AndPointcut.unify example, Var.unify, Unification