Examples of javassist.expr.ExprEditor

javassist.expr.ExprEditor
A translator of method bodies.
The users can define a subclass of this class to customize how to modify a method body. The overall architecture is similar to the strategy pattern.
If instrument() is called in CtMethod, the method body is scanned from the beginning to the end. Whenever an expression, such as a method call and a new expression (object creation), is found, edit() is called in ExprEdit. edit() can inspect and modify the given expression. The modification is reflected on the original method body. If edit() does nothing, the original method body is not changed.
The following code is an example:
This code inspects all method calls appearing in the method represented by cm and it prints the names and the line numbers of the methods declared in class Point. This code does not modify the body of the method represented by cm. If the method body must be modified, call replace() in MethodCall. @see javassist.CtClass#instrument(ExprEditor) @see javassist.CtMethod#instrument(ExprEditor) @see javassist.CtConstructor#instrument(ExprEditor) @see MethodCall @see NewExpr @see FieldAccess @see javassist.CodeConverter

            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.CALL, classInfo, classInfo), ctClass)) {
                continue;
            }
            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(MethodCall methodCall) throws CannotCompileException {
                            try {
                                CtBehavior where;
                                try {
                                    where = methodCall.where();

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            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.CALL, classInfo, classInfo), ctClass)) {
                continue;
            }
            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(NewExpr newExpr) throws CannotCompileException {
                            try {
                                CtBehavior where = null;
                                try {
                                    where = newExpr.where();

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        if (TransformClasses.debugInstrumentation)
            logger.trace("Instrument Agent --> Processing class initializer (static {})....");


        if (cm == null) return;


        cm.instrument(new ExprEditor() {
            public void edit(MethodCall m) throws CannotCompileException {
                try {
                    processMethodCall(m, clazz);
                } catch (Exception e) {
                    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.

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    private final static void processMethodCalls(CtBehavior cm, final CtClass clazz) throws CannotCompileException {
        if (TransformClasses.debugInstrumentation)
            logger.trace("Instrument Agent --> Processing Methods ...");


        cm.instrument(new ExprEditor() {
            public void edit(MethodCall m) throws CannotCompileException {
                try {
                    processMethodCall(m, clazz);
                } catch (Exception e) {
                    e.printStackTrace();

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    if (initialiser != null) {
      allBehaviours.add(initialiser);
    }
    final boolean remove = attributes.containsKey("remove");
    for (CtBehavior ctBehavior : allBehaviours) {
      ctBehavior.instrument(new ExprEditor() {
        @Override
        public void edit(FieldAccess fieldAccess) throws CannotCompileException {
          if (fieldAccess.getClassName().equals(ctClass.getName()) && fieldAccess.getFieldName().equals(field)) {
            if (fieldAccess.isReader()) {
              if (remove) {

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      allBehaviours.add(ctBehavior);
    }
    final IntHolder replaced = new IntHolder();
    for (CtBehavior ctBehavior_ : allBehaviours) {
      final Map<Integer, String> newExprType = new HashMap<Integer, String>();
      ctBehavior_.instrument(new ExprEditor() {
        NewExpr lastNewExpr;
        int newPos = 0;


        @Override
        public void edit(NewExpr e) {
          lastNewExpr = null;
          newPos++;
          try {
            if (classPool.get(e.getClassName()).subtypeOf(ctField.getType())) {
              lastNewExpr = e;
            }
          } catch (NotFoundException ignored) {
          }
        }


        @Override
        public void edit(FieldAccess e) {
          NewExpr myLastNewExpr = lastNewExpr;
          lastNewExpr = null;
          if (myLastNewExpr != null && e.getFieldName().equals(field)) {
            newExprType.put(newPos, classSignatureToName(e.getSignature()));
          }
        }


        @Override
        public void edit(MethodCall e) {
          lastNewExpr = null;
        }


        @Override
        public void edit(NewArray e) {
          lastNewExpr = null;
        }


        @Override
        public void edit(Cast e) {
          lastNewExpr = null;
        }


        @Override
        public void edit(Instanceof e) {
          lastNewExpr = null;
        }


        @Override
        public void edit(Handler e) {
          lastNewExpr = null;
        }


        @Override
        public void edit(ConstructorCall e) {
          lastNewExpr = null;
        }
      });
      ctBehavior_.instrument(new ExprEditor() {
        int newPos = 0;


        @Override
        public void edit(NewExpr e) throws CannotCompileException {
          newPos++;

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    } else {
      allBehaviours.add((CtBehavior) o);
    }
    final IntHolder done = new IntHolder();
    for (CtBehavior ctBehavior : allBehaviours) {
      ctBehavior.instrument(new ExprEditor() {
        @Override
        public void edit(NewExpr e) throws CannotCompileException {
          if (e.getClassName().equals(type)) {
            e.replace(newInitialiser);
            done.value++;

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    if (readCode == null && writeCode == null) {
      throw new IllegalArgumentException("readCode or writeCode must be set");
    }
    final IntHolder replaced = new IntHolder();
    try {
      ctBehavior.instrument(new ExprEditor() {
        @Override
        public void edit(FieldAccess fieldAccess) throws CannotCompileException {
          String fieldName;
          try {
            fieldName = fieldAccess.getFieldName();

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    final IntHolder replaced = new IntHolder();
    final int index = Integer.valueOf(index_);
    final boolean removeAfter = attributes.containsKey("removeAfter");


    try {
      ctBehavior.instrument(new ExprEditor() {
        private int currentIndex = 0;


        @Override
        public void edit(MethodCall methodCall) throws CannotCompileException {
          if ((className == null || methodCall.getClassName().equals(className)) && (method.isEmpty() || methodCall.getMethodName().equals(method)) && (index == -1 || currentIndex++ == index)) {

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    final String field = attributes.get("field");
    final String threadLocalField = attributes.get("threadLocalField");
    final String type = attributes.get("type");
    String setExpression_ = attributes.get("setExpression");
    final String setExpression = setExpression_ == null ? '(' + type + ") $1" : setExpression_;
    ctClass.instrument(new ExprEditor() {
      @Override
      public void edit(FieldAccess e) throws CannotCompileException {
        if (e.getFieldName().equals(field)) {
          if (e.isReader()) {
            e.replace("{ $_ = (" + type + ") " + threadLocalField + ".get(); }");

View Full Code Here

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