enable this?() syntax

org.aspectj.matcher/src/org/aspectj/weaver/patterns/NameBindingPointcut.java

@@ -25,6 +25,7 @@ import org.aspectj.weaver.ast.Var;
  * 
  * @author Erik Hilsdale
  * @author Jim Hugunin
+ * @author Andy Clement
  */
 public abstract class NameBindingPointcut extends Pointcut {
 
@@ -45,8 +46,7 @@ public abstract class NameBindingPointcut extends Pointcut {
 		return Test.makeInstanceof(var, myType.resolve(world));
 	}
 	
-	public abstract List/*<BindingTypePattern>*/ getBindingTypePatterns();
-	public abstract List/*<BindingAnnotationTypePattern>*/ getBindingAnnotationTypePatterns();
-
+	public abstract List<BindingTypePattern> getBindingTypePatterns();
+	public abstract List<BindingAnnotationTypePattern> getBindingAnnotationTypePatterns();
 
 }

org.aspectj.matcher/src/org/aspectj/weaver/patterns/PatternParser.java

@@ -562,10 +562,14 @@ public class PatternParser {
 	 * @return Pointcut
 	 */
 	private Pointcut parseThisOrTargetPointcut(String kind) {
+		boolean optional = false;
+		if (maybeEat("?")) {
+			optional = true;
+		}
 		eat("(");
 		TypePattern type = parseTypePattern();
 		eat(")");
-		return new ThisOrTargetPointcut(kind.equals("this"), type);
+		return new ThisOrTargetPointcut(kind.equals("this"), type,optional);
 	}
 
 	private Pointcut parseThisOrTargetAnnotationPointcut() {

org.aspectj.matcher/src/org/aspectj/weaver/patterns/Pointcut.java

@@ -168,6 +168,7 @@ public abstract class Pointcut extends PatternNode {
 
 	public static final byte ATARGS = 21;
 	public static final byte USER_EXTENSION = 22;
+	public static final byte THIS_OR_TARGET_WITH_OPTIONAL = 23;
 
 	public byte getPointcutKind() {
 		return pointcutKind;
@@ -282,7 +283,7 @@ public abstract class Pointcut extends PatternNode {
 			ret = WithinPointcut.read(s, context);
 			break;
 		case THIS_OR_TARGET:
-			ret = ThisOrTargetPointcut.read(s, context);
+			ret = ThisOrTargetPointcut.read(s, context, false);
 			break;
 		case ARGS:
 			ret = ArgsPointcut.read(s, context);
@@ -335,6 +336,9 @@ public abstract class Pointcut extends PatternNode {
 		case NONE:
 			ret = makeMatchesNothing(RESOLVED);
 			break;
+		case THIS_OR_TARGET_WITH_OPTIONAL:
+			ret = ThisOrTargetPointcut.read(s,context,true);
+			break;
 		default:
 			throw new BCException("unknown kind: " + kind);
 		}

org.aspectj.matcher/src/org/aspectj/weaver/patterns/ThisOrTargetPointcut.java

@@ -50,6 +50,7 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 	private boolean isThis;
 	private TypePattern typePattern;
 	private String declarationText;
+	private boolean optional = false;
 
 	private static final int thisKindSet;
 	private static final int targetKindSet;
@@ -74,10 +75,11 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 		return (typePattern instanceof BindingTypePattern);
 	}
 
-	public ThisOrTargetPointcut(boolean isThis, TypePattern type) {
+	public ThisOrTargetPointcut(boolean isThis, TypePattern type, boolean optional) {
 		this.isThis = isThis;
 		this.typePattern = type;
 		this.pointcutKind = THIS_OR_TARGET;
+		this.optional = optional;
 		this.declarationText = (isThis ? "this(" : "target(") + type + ")";
 	}
 
@@ -91,11 +93,12 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 
 	@Override
 	public Pointcut parameterizeWith(Map typeVariableMap, World w) {
-		ThisOrTargetPointcut ret = new ThisOrTargetPointcut(isThis, typePattern.parameterizeWith(typeVariableMap, w));
+		ThisOrTargetPointcut ret = new ThisOrTargetPointcut(isThis, typePattern.parameterizeWith(typeVariableMap, w),optional);
 		ret.copyLocationFrom(this);
 		return ret;
 	}
 
+
 	@Override
 	public int couldMatchKinds() {
 		return isThis ? thisKindSet : targetKindSet;
@@ -107,7 +110,7 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 	}
 
 	private boolean couldMatch(Shadow shadow) {
-		return isThis ? shadow.hasThis() : shadow.hasTarget();
+		return optional || (isThis ? shadow.hasThis() : shadow.hasTarget()) ;
 	}
 
 	@Override
@@ -115,27 +118,35 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 		if (!couldMatch(shadow)) {
 			return FuzzyBoolean.NO;
 		}
-		UnresolvedType typeToMatch = isThis ? shadow.getThisType() : shadow.getTargetType();
-		// optimization for case of this(Object) or target(Object)
-		// works for an ExactTypePattern (and we know there are no annotations to match here of course)
-		if (typePattern.getExactType().equals(ResolvedType.OBJECT)) {
+		if (isThis?shadow.hasThis():shadow.hasTarget()) {
+			UnresolvedType typeToMatch = isThis ? shadow.getThisType() : shadow.getTargetType();
+			// optimization for case of this(Object) or target(Object)
+			// works for an ExactTypePattern (and we know there are no annotations to match here of course)
+			if (typePattern.getExactType().equals(ResolvedType.OBJECT)) {
+				return FuzzyBoolean.YES;
+			}
+			return typePattern.matches(typeToMatch.resolve(shadow.getIWorld()), TypePattern.DYNAMIC);
+		} else { // assert optional
 			return FuzzyBoolean.YES;
 		}
-		return typePattern.matches(typeToMatch.resolve(shadow.getIWorld()), TypePattern.DYNAMIC);
 	}
 
 	@Override
 	public void write(CompressingDataOutputStream s) throws IOException {
-		s.writeByte(Pointcut.THIS_OR_TARGET);
+		if (optional) {
+			s.writeByte(Pointcut.THIS_OR_TARGET_WITH_OPTIONAL);
+		} else {
+			s.writeByte(Pointcut.THIS_OR_TARGET);
+		}
 		s.writeBoolean(isThis);
 		typePattern.write(s);
 		writeLocation(s);
 	}
 
-	public static Pointcut read(VersionedDataInputStream s, ISourceContext context) throws IOException {
+	public static Pointcut read(VersionedDataInputStream s, ISourceContext context, boolean optional) throws IOException {
 		boolean isThis = s.readBoolean();
 		TypePattern type = TypePattern.read(s, context);
-		ThisOrTargetPointcut ret = new ThisOrTargetPointcut(isThis, type);
+		ThisOrTargetPointcut ret = new ThisOrTargetPointcut(isThis, type, optional);
 		ret.readLocation(context, s);
 		return ret;
 	}
@@ -165,8 +176,8 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 	 * @see org.aspectj.weaver.patterns.NameBindingPointcut#getBindingAnnotationTypePatterns()
 	 */
 	@Override
-	public List getBindingAnnotationTypePatterns() {
-		return Collections.EMPTY_LIST;
+	public List<BindingAnnotationTypePattern> getBindingAnnotationTypePatterns() {
+		return Collections.emptyList();
 	}
 
 	/*
@@ -175,13 +186,13 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 	 * @see org.aspectj.weaver.patterns.NameBindingPointcut#getBindingTypePatterns()
 	 */
 	@Override
-	public List getBindingTypePatterns() {
+	public List<BindingTypePattern> getBindingTypePatterns() {
 		if (typePattern instanceof BindingTypePattern) {
-			List l = new ArrayList();
-			l.add(typePattern);
+			List<BindingTypePattern> l = new ArrayList<BindingTypePattern>();
+			l.add((BindingTypePattern)typePattern);
 			return l;
 		} else {
-			return Collections.EMPTY_LIST;
+			return Collections.emptyList();
 		}
 	}
 
@@ -222,9 +233,36 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 			return Literal.TRUE;
 		}
 
-		Var var = isThis ? shadow.getThisVar() : shadow.getTargetVar();
+		if (isThis?shadow.hasThis():shadow.hasTarget()) {
+			Var var = isThis ? shadow.getThisVar() : shadow.getTargetVar();
+	
+			return exposeStateForVar(var, typePattern, state, shadow.getIWorld());
+		} else { // assert optional	
+
+			Var v = new NullVar(typePattern.getExactType().resolve(shadow.getIWorld()));
+//			return exposeStateForVar(var, typePattern, state, shadow.getIWorld());
+			if (typePattern instanceof BindingTypePattern) {
+				BindingTypePattern b = (BindingTypePattern)typePattern;
+				state.set(b.getFormalIndex(), v);
+			}
+//			ResolvedType myType = typePattern.getExactType().resolve(world);
+//			if (myType.isParameterizedType()) {
+//				// unchecked warning already issued...
+//				myType = (ResolvedType) myType.getRawType();
+//			}
+//			return Test.makeInstanceof(var, myType.resolve(world));
+			return Literal.TRUE;
+//			return exposeStateForVar(null, typePattern, state, shadow.getIWorld());
+		}
+	}
+	
+	public static class NullVar extends Var {
 
-		return exposeStateForVar(var, typePattern, state, shadow.getIWorld());
+		public NullVar(ResolvedType variableType) {
+			super(variableType);
+			// TODO Auto-generated constructor stub
+		}
+		
 	}
 
 	@Override
@@ -242,7 +280,7 @@ public class ThisOrTargetPointcut extends NameBindingPointcut {
 			inAspect.crosscuttingMembers.exposeType(newType.getExactType());
 		}
 
-		Pointcut ret = new ThisOrTargetPointcut(isThis, newType);
+		Pointcut ret = new ThisOrTargetPointcut(isThis, newType, optional);
 		ret.copyLocationFrom(this);
 		return ret;
 	}

weaver/src/org/aspectj/weaver/bcel/BcelAdvice.java

@@ -49,10 +49,12 @@ import org.aspectj.weaver.WeaverMessages;
 import org.aspectj.weaver.World;
 import org.aspectj.weaver.ast.Literal;
 import org.aspectj.weaver.ast.Test;
+import org.aspectj.weaver.ast.Var;
 import org.aspectj.weaver.patterns.ExactTypePattern;
 import org.aspectj.weaver.patterns.ExposedState;
 import org.aspectj.weaver.patterns.PerClause;
 import org.aspectj.weaver.patterns.Pointcut;
+import org.aspectj.weaver.patterns.ThisOrTargetPointcut.NullVar;
 
 /**
  * Advice implemented for BCEL
@@ -538,8 +540,12 @@ class BcelAdvice extends Advice {
 			if (exposedState.isErroneousVar(i)) {
 				continue; // Erroneous vars have already had error msgs reported!
 			}
-			BcelVar v = (BcelVar) exposedState.get(i);
-
+			
+			Var var = exposedState.get(i);
+			if (var instanceof NullVar) {
+				il.append(InstructionConstants.ACONST_NULL);	
+			} else {
+			BcelVar v = (BcelVar) var;
 			if (v == null) {
 				// if not @AJ aspect, go on with the regular binding handling
 				if (!isAnnotationStyleAspect) {
@@ -605,6 +611,7 @@ class BcelAdvice extends Advice {
 				UnresolvedType desiredTy = getBindingParameterTypes()[i];
 				v.appendLoadAndConvert(il, fact, desiredTy.resolve(world));
 			}
+			}
 		}
 
 		// ATAJ: for code style aspect, handles the extraFlag as usual ie not