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


        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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        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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        }


        final boolean[] needsContinuations = new boolean[]{false};


        for (CtMethod m : ctClass.getDeclaredMethods()) {
            m.instrument(new ExprEditor() {


                @Override
                public void edit(MethodCall m) throws CannotCompileException {
                    try {
                        if (continuationMethods.contains(m.getMethod().getLongName())) {

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            throw new UnexpectedException("Error in PropertiesEnhancer", e);
        }


        // Intercept all fields access
        for (final CtBehavior ctMethod : ctClass.getDeclaredBehaviors()) {
            ctMethod.instrument(new ExprEditor() {


                @Override
                public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                    try {

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        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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        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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            if (classFilter(definition, classMetaData, ctClass)) {
                return;
            }


            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                            try {
                                CtBehavior where = null;
                                try {
                                    where = fieldAccess.where();

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            if (classFilter(definition, classMetaData, ctClass)) {
                return;
            }


            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(MethodCall methodCall) throws CannotCompileException {
                            try {
                                CtBehavior where = null;
                                try {
                                    where = methodCall.where();

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            throw new UnexpectedException("Error in PropertiesEnhancer", e);
        }


        // Intercept all fields access
        for (final CtBehavior ctMethod : ctClass.getDeclaredBehaviors()) {
            ctMethod.instrument(new ExprEditor() {


                @Override
                public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                    try {

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        }


        for (final CtMethod ctMethod : ctClass.getDeclaredMethods()) {


            // Threaded access    
            ctMethod.instrument(new ExprEditor() {


                @Override
                public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                    try {
                        if (isThreadedFieldAccess(fieldAccess.getField())) {
                            if (fieldAccess.isReader()) {
                                fieldAccess.replace("$_ = ($r)play.utils.Java.invokeStatic($type, \"current\");");
                            }
                        }
                    } catch (Exception e) {
                        Logger.error(e, "Error in ControllersEnhancer. %s.%s has not been properly enhanced (fieldAccess %s).", applicationClass.name, ctMethod.getName(), fieldAccess);
                        throw new UnexpectedException(e);
                    }
                }
            });


            // Auto-redirect
            boolean isHandler = false;
            for (Annotation a : getAnnotations(ctMethod).getAnnotations()) {
                if (a.getTypeName().startsWith("play.mvc.")) {
                    isHandler = true;
                    break;
                }
                if (a.getTypeName().endsWith("$ByPass")) {
                    isHandler = true;
                    break;
                }
            }


            // Perhaps it is a scala-generated method ?
            if (ctMethod.getName().contains("$")) {
                isHandler = true;
            } else {
                if (ctClass.getName().endsWith("$") && ctMethod.getParameterTypes().length == 0) {
                    try {
                        ctClass.getField(ctMethod.getName());
                        isHandler = true;
                    } catch (NotFoundException e) {
                        // ok
                    }
                }
            }


            if (isScalaObject(ctClass)) {


                // Auto reverse -->
                if (Modifier.isPublic(ctMethod.getModifiers()) && ((ctClass.getName().endsWith("$") && !ctMethod.getName().contains("$default$"))) && !isHandler) {
                    try {
                        ctMethod.insertBefore(
                                "if(play.mvc.Controller._currentReverse.get() != null) {"
                                + "play.mvc.Controller.redirect(\"" + ctClass.getName().replace("$", "") + "." + ctMethod.getName() + "\", $args);"
                                + generateValidReturnStatement(ctMethod.getReturnType())
                                + "}");


                        ctMethod.insertBefore(
                                "((java.util.Stack)play.classloading.enhancers.ControllersEnhancer.currentAction.get()).push(\"" + ctClass.getName().replace("$", "") + "." + ctMethod.getName() + "\");");


                        ctMethod.insertAfter(
                                "((java.util.Stack)play.classloading.enhancers.ControllersEnhancer.currentAction.get()).pop();", true);


                    } catch (Exception e) {
                        Logger.error(e, "Error in ControllersEnhancer. %s.%s has not been properly enhanced (auto-reverse).", applicationClass.name, ctMethod.getName());
                        throw new UnexpectedException(e);
                    }
                }


            } else {


                // Auto redirect -->
                if (Modifier.isPublic(ctMethod.getModifiers()) && Modifier.isStatic(ctMethod.getModifiers()) && ctMethod.getReturnType().equals(CtClass.voidType) && !isHandler) {
                    try {
                        ctMethod.insertBefore(
                                "if(!play.classloading.enhancers.ControllersEnhancer.ControllerInstrumentation.isActionCallAllowed()) {"
                                + "play.mvc.Controller.redirect(\"" + ctClass.getName().replace("$", "") + "." + ctMethod.getName() + "\", $args);"
                                + generateValidReturnStatement(ctMethod.getReturnType()) + "}"
                                + "play.classloading.enhancers.ControllersEnhancer.ControllerInstrumentation.stopActionCall();");


                    } catch (Exception e) {
                        Logger.error(e, "Error in ControllersEnhancer. %s.%s has not been properly enhanced (auto-redirect).", applicationClass.name, ctMethod.getName());
                        throw new UnexpectedException(e);
                    }
                }


            }


            // Enhance global catch to avoid potential unwanted catching of play.mvc.results.Result
            ctMethod.instrument(new ExprEditor() {


                @Override
                public void edit(Handler handler) throws CannotCompileException {
                    StringBuilder code = new StringBuilder();
                    try {

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