Examples of 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

Examples of javassist.expr.ExprEditor

            final CtClass ctClass = klass.getCtClass();
            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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Examples of javassist.expr.ExprEditor

            final ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(ctClass, new ExpressionContext(PointcutType.SET, classInfo, classInfo), definition)
                && classFilter(ctClass, new ExpressionContext(PointcutType.GET, classInfo, classInfo), definition)) {
                continue;
            }
            ctClass.instrument(new ExprEditor() {
                public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                    try {
                        CtBehavior where = null;
                        try {
                            where = fieldAccess.where();

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Examples of javassist.expr.ExprEditor

        for (CtClass nc : nestedClasses)
        {
            add(nc.getName());
        }


        ctClass.instrument(new ExprEditor()
        {
            public void edit(ConstructorCall c) throws CannotCompileException
            {
                if (c.getMethodName().equals("this"))
                    return;

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Examples of javassist.expr.ExprEditor


        if (_fieldReadTransforms == null) _fieldReadTransforms = newMap();


        if (_fieldWriteTransforms == null) _fieldWriteTransforms = newMap();


        ExprEditor editor = new ExprEditor()
        {
            @Override
            public void edit(FieldAccess access) throws CannotCompileException
            {
                // Ignore any methods to were added as part of the transformation.

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Examples of javassist.expr.ExprEditor

        {
            putIfNotNull(fieldReadTransforms, tfi.name, tfi.readValueBody);
            putIfNotNull(fieldWriteTransforms, tfi.name, tfi.writeValueBody);
        }


        ExprEditor editor = new ExprEditor()
        {
            private final Set<CtBehavior> addedMethods = CollectionFactory.newSet();


            {
                for (TransformMethodImpl tmi : methods.values())

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Examples of javassist.expr.ExprEditor


        if (fieldReadTransforms == null) fieldReadTransforms = CollectionFactory.newMap();


        if (fieldWriteTransforms == null) fieldWriteTransforms = CollectionFactory.newMap();


        ExprEditor editor = new ExprEditor()
        {
            @Override
            public void edit(FieldAccess access) throws CannotCompileException
            {
                CtBehavior where = access.where();

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Examples of javassist.expr.ExprEditor


        if (_fieldReadTransforms == null) _fieldReadTransforms = newMap();


        if (_fieldWriteTransforms == null) _fieldWriteTransforms = newMap();


        ExprEditor editor = new ExprEditor()
        {
            @Override
            public void edit(FieldAccess access) throws CannotCompileException
            {
                CtBehavior where = access.where();

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Examples of javassist.expr.ExprEditor

        {
            putIfNotNull(fieldReadTransforms, tfi.name, tfi.readValueBody);
            putIfNotNull(fieldWriteTransforms, tfi.name, tfi.writeValueBody);
        }


        ExprEditor editor = new ExprEditor()
        {
            private final Set<CtBehavior> addedMethods = CollectionFactory.newSet();


            {
                for (TransformMethodImpl tmi : methods.values())

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Examples of javassist.expr.ExprEditor


        if (_fieldReadTransforms == null) _fieldReadTransforms = newMap();


        if (_fieldWriteTransforms == null) _fieldWriteTransforms = newMap();


        ExprEditor editor = new ExprEditor()
        {
            @Override
            public void edit(FieldAccess access) throws CannotCompileException
            {
                // Ignore any methods to were added as part of the transformation.

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Examples of javassist.expr.ExprEditor

    }


    public void testJIRA152() throws Exception {
        CtClass cc = ClassPool.getDefault().get("test4.JIRA152");
        CtMethod mth = cc.getDeclaredMethod("buildColumnOverride");
        mth.instrument(new ExprEditor() {
            public void edit(MethodCall c) throws CannotCompileException {
                c.replace("try{ $_ = $proceed($$); } catch (Throwable t) { throw t; }");
            }
        });
        mth.getMethodInfo().rebuildStackMap(ClassPool.getDefault());

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