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The AspectJ weaver introduces advices to java classes
/*******************************************************************************
* Copyright (c) 2004, 2017 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.aspectj.weaver.tools;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;
import org.aspectj.bridge.IMessageHandler;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.SourceLocation;
import org.aspectj.weaver.BindingScope;
import org.aspectj.weaver.IHasPosition;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.IntMap;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.WeakClassLoaderReference;
import org.aspectj.weaver.World;
import org.aspectj.weaver.internal.tools.PointcutExpressionImpl;
import org.aspectj.weaver.internal.tools.TypePatternMatcherImpl;
import org.aspectj.weaver.patterns.AndPointcut;
import org.aspectj.weaver.patterns.CflowPointcut;
import org.aspectj.weaver.patterns.FormalBinding;
import org.aspectj.weaver.patterns.IScope;
import org.aspectj.weaver.patterns.KindedPointcut;
import org.aspectj.weaver.patterns.NotPointcut;
import org.aspectj.weaver.patterns.OrPointcut;
import org.aspectj.weaver.patterns.ParserException;
import org.aspectj.weaver.patterns.PatternParser;
import org.aspectj.weaver.patterns.Pointcut;
import org.aspectj.weaver.patterns.SimpleScope;
import org.aspectj.weaver.patterns.ThisOrTargetAnnotationPointcut;
import org.aspectj.weaver.patterns.ThisOrTargetPointcut;
import org.aspectj.weaver.patterns.TypePattern;
import org.aspectj.weaver.reflect.PointcutParameterImpl;
import org.aspectj.weaver.reflect.ReflectionWorld;
/**
* A PointcutParser can be used to build PointcutExpressions for a user-defined subset of AspectJ's pointcut language
*
* @author Adrian Colyer
* @author Andy Clement
*/
public class PointcutParser {
private ReflectionWorld world;
private WeakClassLoaderReference classLoaderReference;
private final Set supportedPrimitives;
private final Set pointcutDesignators = new HashSet<>();
/**
* @return a Set containing every PointcutPrimitive except if, cflow, and cflowbelow (useful for passing to PointcutParser
* constructor).
*/
public static Set getAllSupportedPointcutPrimitives() {
Set primitives = new HashSet<>();
primitives.add(PointcutPrimitive.ADVICE_EXECUTION);
primitives.add(PointcutPrimitive.ARGS);
primitives.add(PointcutPrimitive.CALL);
primitives.add(PointcutPrimitive.EXECUTION);
primitives.add(PointcutPrimitive.GET);
primitives.add(PointcutPrimitive.HANDLER);
primitives.add(PointcutPrimitive.INITIALIZATION);
primitives.add(PointcutPrimitive.PRE_INITIALIZATION);
primitives.add(PointcutPrimitive.SET);
primitives.add(PointcutPrimitive.STATIC_INITIALIZATION);
primitives.add(PointcutPrimitive.TARGET);
primitives.add(PointcutPrimitive.THIS);
primitives.add(PointcutPrimitive.WITHIN);
primitives.add(PointcutPrimitive.WITHIN_CODE);
primitives.add(PointcutPrimitive.AT_ANNOTATION);
primitives.add(PointcutPrimitive.AT_THIS);
primitives.add(PointcutPrimitive.AT_TARGET);
primitives.add(PointcutPrimitive.AT_ARGS);
primitives.add(PointcutPrimitive.AT_WITHIN);
primitives.add(PointcutPrimitive.AT_WITHINCODE);
primitives.add(PointcutPrimitive.REFERENCE);
return primitives;
}
/**
* Returns a pointcut parser that can parse the full AspectJ pointcut language with the following exceptions:
*
* - The
if, cflow, and cflowbelow pointcut designators are not supported
* - Pointcut expressions must be self-contained :- they cannot contain references to other named pointcuts
*
- The pointcut expression must be anonymous with no formals allowed.
*
*
* When resolving types in pointcut expressions, the context classloader is used to find types.
*
*/
public static PointcutParser getPointcutParserSupportingAllPrimitivesAndUsingContextClassloaderForResolution() {
PointcutParser p = new PointcutParser();
p.setClassLoader(Thread.currentThread().getContextClassLoader());
return p;
}
/**
* Returns a pointcut parser that can parse pointcut expressions built from a user-defined subset of AspectJ's supported
* pointcut primitives. The following restrictions apply:
*
* - The
if, cflow, and cflowbelow pointcut designators are not supported
* - Pointcut expressions must be self-contained :- they cannot contain references to other named pointcuts
*
- The pointcut expression must be anonymous with no formals allowed.
*
*
* When resolving types in pointcut expressions, the context classloader is used to find types.
*
*
* @param supportedPointcutKinds a set of PointcutPrimitives this parser should support
* @throws UnsupportedOperationException if the set contains if, cflow, or cflow below
*/
public static PointcutParser getPointcutParserSupportingSpecifiedPrimitivesAndUsingContextClassloaderForResolution(
Set supportedPointcutKinds) {
PointcutParser p = new PointcutParser(supportedPointcutKinds);
p.setClassLoader(Thread.currentThread().getContextClassLoader());
return p;
}
/**
* Returns a pointcut parser that can parse the full AspectJ pointcut language with the following exceptions:
*
* - The
if, cflow, and cflowbelow pointcut designators are not supported
* - Pointcut expressions must be self-contained :- they cannot contain references to other named pointcuts
*
- The pointcut expression must be anonymous with no formals allowed.
*
*
* When resolving types in pointcut expressions, the given classloader is used to find types.
*
*/
public static PointcutParser getPointcutParserSupportingAllPrimitivesAndUsingSpecifiedClassloaderForResolution(
ClassLoader classLoader) {
PointcutParser p = new PointcutParser();
p.setClassLoader(classLoader);
return p;
}
/**
* Returns a pointcut parser that can parse pointcut expressions built from a user-defined subset of AspectJ's supported
* pointcut primitives. The following restrictions apply:
*
* - The
if, cflow, and cflowbelow pointcut designators are not supported
* - Pointcut expressions must be self-contained :- they cannot contain references to other named pointcuts
*
- The pointcut expression must be anonymous with no formals allowed.
*
*
* When resolving types in pointcut expressions, the given classloader is used to find types.
*
*
* @param supportedPointcutKinds a set of PointcutPrimitives this parser should support
* @throws UnsupportedOperationException if the set contains if, cflow, or cflow below
*/
public static PointcutParser getPointcutParserSupportingSpecifiedPrimitivesAndUsingSpecifiedClassLoaderForResolution(
Set supportedPointcutKinds, ClassLoader classLoader) {
PointcutParser p = new PointcutParser(supportedPointcutKinds);
p.setClassLoader(classLoader);
return p;
}
/**
* Create a pointcut parser that can parse the full AspectJ pointcut language with the following exceptions:
*
* - The
if, cflow, and cflowbelow pointcut designators are not supported
* - Pointcut expressions must be self-contained :- they cannot contain references to other named pointcuts
*
- The pointcut expression must be anonymous with no formals allowed.
*
*/
protected PointcutParser() {
supportedPrimitives = getAllSupportedPointcutPrimitives();
setClassLoader(PointcutParser.class.getClassLoader());
}
/**
* Create a pointcut parser that can parse pointcut expressions built from a user-defined subset of AspectJ's supported pointcut
* primitives. The following restrictions apply:
*
* - The
if, cflow, and cflowbelow pointcut designators are not supported
* - Pointcut expressions must be self-contained :- they cannot contain references to other named pointcuts
*
- The pointcut expression must be anonymous with no formals allowed.
*
*
* @param supportedPointcutKinds a set of PointcutPrimitives this parser should support
* @throws UnsupportedOperationException if the set contains if, cflow, or cflow below
*/
private PointcutParser(Set supportedPointcutKinds) {
supportedPrimitives = supportedPointcutKinds;
for (PointcutPrimitive pointcutPrimitive : supportedPointcutKinds) {
if ((pointcutPrimitive == PointcutPrimitive.IF) || (pointcutPrimitive == PointcutPrimitive.CFLOW)
|| (pointcutPrimitive == PointcutPrimitive.CFLOW_BELOW)) {
throw new UnsupportedOperationException("Cannot handle if, cflow, and cflowbelow primitives");
}
}
setClassLoader(PointcutParser.class.getClassLoader());
}
protected void setWorld(ReflectionWorld aWorld) {
this.world = aWorld;
}
/**
* Set the classloader that this parser should use for type resolution.
*
* @param aLoader
*/
protected void setClassLoader(ClassLoader aLoader) {
this.classLoaderReference = new WeakClassLoaderReference(aLoader);
world = ReflectionWorld.getReflectionWorldFor(this.classLoaderReference);
}
/**
* Set the classloader that this parser should use for type resolution.
*
* @param aLoader
* @param shareWorlds if true then two PointcutParsers operating using the same classloader will share a ReflectionWorld
*/
protected void setClassLoader(ClassLoader aLoader, boolean shareWorlds) {
this.classLoaderReference = new WeakClassLoaderReference(aLoader);
if (shareWorlds) {
world = ReflectionWorld.getReflectionWorldFor(this.classLoaderReference);
} else {
world = new ReflectionWorld(classLoaderReference);
}
}
/**
* Set the lint properties for this parser from the given resource on the classpath.
*
* @param resourcePath path to a file containing aspectj lint properties
*/
public void setLintProperties(String resourcePath) throws IOException {
URL url = this.classLoaderReference.getClassLoader().getResource(resourcePath);
InputStream is = url.openStream();
Properties p = new Properties();
p.load(is);
setLintProperties(p);
}
/**
* Set the lint properties for this parser from the given properties set.
*
* @param properties
*/
public void setLintProperties(Properties properties) {
getWorld().getLint().setFromProperties(properties);
}
/**
* Register a new pointcut designator handler with this parser. This provides an extension mechansim for the integration of
* domain-specific pointcut designators with the AspectJ pointcut language.
*
* @param designatorHandler
*/
public void registerPointcutDesignatorHandler(PointcutDesignatorHandler designatorHandler) {
this.pointcutDesignators.add(designatorHandler);
if (world != null) {
world.registerPointcutHandler(designatorHandler);
}
}
/**
* Create a pointcut parameter of the given name and type.
*
* @param name
* @param type
* @return
*/
public PointcutParameter createPointcutParameter(String name, Class type) {
return new PointcutParameterImpl(name, type);
}
/**
* Parse the given pointcut expression. A global scope is assumed for resolving any type references, and the pointcut must
* contain no formals (variables to be bound).
*
* @throws UnsupportedPointcutPrimitiveException if the parser encounters a primitive pointcut expression of a kind not
* supported by this PointcutParser.
* @throws IllegalArgumentException if the expression is not a well-formed pointcut expression
*/
public PointcutExpression parsePointcutExpression(String expression) throws UnsupportedPointcutPrimitiveException,
IllegalArgumentException {
return parsePointcutExpression(expression, null, new PointcutParameter[0]);
}
/**
* Parse the given pointcut expression. The pointcut is resolved as if it had been declared inside the inScope class (this
* allows the pointcut to contain unqualified references to other pointcuts declared in the same type for example). The pointcut
* may contain zero or more formal parameters to be bound at matched join points.
*
* @throws UnsupportedPointcutPrimitiveException if the parser encounters a primitive pointcut expression of a kind not
* supported by this PointcutParser.
* @throws IllegalArgumentException if the expression is not a well-formed pointcut expression
*/
public PointcutExpression parsePointcutExpression(String expression, Class inScope, PointcutParameter[] formalParameters)
throws UnsupportedPointcutPrimitiveException, IllegalArgumentException {
PointcutExpressionImpl pcExpr = null;
try {
Pointcut pc = resolvePointcutExpression(expression, inScope, formalParameters);
pc = concretizePointcutExpression(pc, inScope, formalParameters);
validateAgainstSupportedPrimitives(pc, expression); // again, because we have now followed any ref'd pcuts
pcExpr = new PointcutExpressionImpl(pc, expression, formalParameters, getWorld());
} catch (ParserException pEx) {
throw new IllegalArgumentException(buildUserMessageFromParserException(expression, pEx));
} catch (ReflectionWorld.ReflectionWorldException rwEx) {
throw new IllegalArgumentException(rwEx.getMessage());
}
return pcExpr;
}
protected Pointcut resolvePointcutExpression(String expression, Class inScope, PointcutParameter[] formalParameters) {
try {
PatternParser parser = new PatternParser(expression);
parser.setPointcutDesignatorHandlers(pointcutDesignators, world);
Pointcut pc = parser.parsePointcut(); // more correctly: parsePointcut(true)
validateAgainstSupportedPrimitives(pc, expression);
IScope resolutionScope = buildResolutionScope((inScope == null ? Object.class : inScope), formalParameters);
pc = pc.resolve(resolutionScope);
return pc;
} catch (ParserException pEx) {
throw new IllegalArgumentException(buildUserMessageFromParserException(expression, pEx));
}
}
protected Pointcut concretizePointcutExpression(Pointcut pc, Class inScope, PointcutParameter[] formalParameters) {
ResolvedType declaringTypeForResolution = null;
if (inScope != null) {
declaringTypeForResolution = getWorld().resolve(inScope.getName());
} else {
declaringTypeForResolution = ResolvedType.OBJECT.resolve(getWorld());
}
IntMap arity = new IntMap(formalParameters.length);
for (int i = 0; i < formalParameters.length; i++) {
arity.put(i, i);
}
return pc.concretize(declaringTypeForResolution, declaringTypeForResolution, arity);
}
/**
* Parse the given aspectj type pattern, and return a matcher that can be used to match types using it.
*
* @param typePattern an aspectj type pattern
* @return a type pattern matcher that matches using the given pattern
* @throws IllegalArgumentException if the type pattern cannot be successfully parsed.
*/
public TypePatternMatcher parseTypePattern(String typePattern) throws IllegalArgumentException {
try {
TypePattern tp = new PatternParser(typePattern).parseTypePattern();
tp.resolve(world);
return new TypePatternMatcherImpl(tp, world);
} catch (ParserException pEx) {
throw new IllegalArgumentException(buildUserMessageFromParserException(typePattern, pEx));
} catch (ReflectionWorld.ReflectionWorldException rwEx) {
throw new IllegalArgumentException(rwEx.getMessage());
}
}
private World getWorld() {
return world;
}
/* for testing */
Set getSupportedPrimitives() {
return supportedPrimitives;
}
/* for testing */
IMessageHandler setCustomMessageHandler(IMessageHandler aHandler) {
IMessageHandler current = getWorld().getMessageHandler();
getWorld().setMessageHandler(aHandler);
return current;
}
private IScope buildResolutionScope(Class inScope, PointcutParameter[] formalParameters) {
if (formalParameters == null) {
formalParameters = new PointcutParameter[0];
}
FormalBinding[] formalBindings = new FormalBinding[formalParameters.length];
for (int i = 0; i < formalBindings.length; i++) {
formalBindings[i] = new FormalBinding(toUnresolvedType(formalParameters[i].getType()), formalParameters[i].getName(), i);
}
if (inScope == null) {
return new SimpleScope(getWorld(), formalBindings);
} else {
ResolvedType inType = getWorld().resolve(inScope.getName());
ISourceContext sourceContext = new ISourceContext() {
public ISourceLocation makeSourceLocation(IHasPosition position) {
return new SourceLocation(new File(""), 0);
}
public ISourceLocation makeSourceLocation(int line, int offset) {
return new SourceLocation(new File(""), line);
}
public int getOffset() {
return 0;
}
public void tidy() {
}
};
return new BindingScope(inType, sourceContext, formalBindings);
}
}
private UnresolvedType toUnresolvedType(Class clazz) {
if (clazz.isArray()) {
return UnresolvedType.forSignature(clazz.getName().replace('.', '/'));
} else {
return UnresolvedType.forName(clazz.getName());
}
}
private void validateAgainstSupportedPrimitives(Pointcut pc, String expression) {
switch (pc.getPointcutKind()) {
case Pointcut.AND:
validateAgainstSupportedPrimitives(((AndPointcut) pc).getLeft(), expression);
validateAgainstSupportedPrimitives(((AndPointcut) pc).getRight(), expression);
break;
case Pointcut.ARGS:
if (!supportedPrimitives.contains(PointcutPrimitive.ARGS)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.ARGS);
}
break;
case Pointcut.CFLOW:
CflowPointcut cfp = (CflowPointcut) pc;
if (cfp.isCflowBelow()) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.CFLOW_BELOW);
} else {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.CFLOW);
}
case Pointcut.HANDLER:
if (!supportedPrimitives.contains(PointcutPrimitive.HANDLER)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.HANDLER);
}
break;
case Pointcut.IF:
case Pointcut.IF_FALSE:
case Pointcut.IF_TRUE:
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.IF);
case Pointcut.KINDED:
validateKindedPointcut(((KindedPointcut) pc), expression);
break;
case Pointcut.NOT:
validateAgainstSupportedPrimitives(((NotPointcut) pc).getNegatedPointcut(), expression);
break;
case Pointcut.OR:
validateAgainstSupportedPrimitives(((OrPointcut) pc).getLeft(), expression);
validateAgainstSupportedPrimitives(((OrPointcut) pc).getRight(), expression);
break;
case Pointcut.THIS_OR_TARGET:
boolean isThis = ((ThisOrTargetPointcut) pc).isThis();
if (isThis && !supportedPrimitives.contains(PointcutPrimitive.THIS)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.THIS);
} else if (!supportedPrimitives.contains(PointcutPrimitive.TARGET)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.TARGET);
}
break;
case Pointcut.WITHIN:
if (!supportedPrimitives.contains(PointcutPrimitive.WITHIN)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.WITHIN);
}
break;
case Pointcut.WITHINCODE:
if (!supportedPrimitives.contains(PointcutPrimitive.WITHIN_CODE)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.WITHIN_CODE);
}
break;
case Pointcut.ATTHIS_OR_TARGET:
isThis = ((ThisOrTargetAnnotationPointcut) pc).isThis();
if (isThis && !supportedPrimitives.contains(PointcutPrimitive.AT_THIS)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.AT_THIS);
} else if (!supportedPrimitives.contains(PointcutPrimitive.AT_TARGET)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.AT_TARGET);
}
break;
case Pointcut.ATARGS:
if (!supportedPrimitives.contains(PointcutPrimitive.AT_ARGS)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.AT_ARGS);
}
break;
case Pointcut.ANNOTATION:
if (!supportedPrimitives.contains(PointcutPrimitive.AT_ANNOTATION)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.AT_ANNOTATION);
}
break;
case Pointcut.ATWITHIN:
if (!supportedPrimitives.contains(PointcutPrimitive.AT_WITHIN)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.AT_WITHIN);
}
break;
case Pointcut.ATWITHINCODE:
if (!supportedPrimitives.contains(PointcutPrimitive.AT_WITHINCODE)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.AT_WITHINCODE);
}
break;
case Pointcut.REFERENCE:
if (!supportedPrimitives.contains(PointcutPrimitive.REFERENCE)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.REFERENCE);
}
break;
case Pointcut.USER_EXTENSION:
// always ok...
break;
case Pointcut.NONE: // deliberate fall-through
default:
throw new IllegalArgumentException("Unknown pointcut kind: " + pc.getPointcutKind());
}
}
private void validateKindedPointcut(KindedPointcut pc, String expression) {
Shadow.Kind kind = pc.getKind();
if ((kind == Shadow.MethodCall) || (kind == Shadow.ConstructorCall)) {
if (!supportedPrimitives.contains(PointcutPrimitive.CALL)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.CALL);
}
} else if ((kind == Shadow.MethodExecution) || (kind == Shadow.ConstructorExecution)) {
if (!supportedPrimitives.contains(PointcutPrimitive.EXECUTION)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.EXECUTION);
}
} else if (kind == Shadow.AdviceExecution) {
if (!supportedPrimitives.contains(PointcutPrimitive.ADVICE_EXECUTION)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.ADVICE_EXECUTION);
}
} else if (kind == Shadow.FieldGet) {
if (!supportedPrimitives.contains(PointcutPrimitive.GET)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.GET);
}
} else if (kind == Shadow.FieldSet) {
if (!supportedPrimitives.contains(PointcutPrimitive.SET)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.SET);
}
} else if (kind == Shadow.Initialization) {
if (!supportedPrimitives.contains(PointcutPrimitive.INITIALIZATION)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.INITIALIZATION);
}
} else if (kind == Shadow.PreInitialization) {
if (!supportedPrimitives.contains(PointcutPrimitive.PRE_INITIALIZATION)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.PRE_INITIALIZATION);
}
} else if (kind == Shadow.StaticInitialization) {
if (!supportedPrimitives.contains(PointcutPrimitive.STATIC_INITIALIZATION)) {
throw new UnsupportedPointcutPrimitiveException(expression, PointcutPrimitive.STATIC_INITIALIZATION);
}
}
}
private String buildUserMessageFromParserException(String pc, ParserException ex) {
StringBuilder msg = new StringBuilder();
msg.append("Pointcut is not well-formed: expecting '");
msg.append(ex.getMessage());
msg.append("'");
IHasPosition location = ex.getLocation();
msg.append(" at character position ");
msg.append(location.getStart());
msg.append("\n");
msg.append(pc);
msg.append("\n");
for (int i = 0; i < location.getStart(); i++) {
msg.append(" ");
}
for (int j = location.getStart(); j <= location.getEnd(); j++) {
msg.append("^");
}
msg.append("\n");
return msg.toString();
}
}