Examples of org.ow2.asm.MethodVisitor.visitFieldInsn()

org.ow2.asm.MethodVisitor.visitFieldInsn()
Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object. @param opcode the opcode of the type instruction to be visited. Thisopcode is either GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD. @param owner the internal name of the field's owner class (see {@link Type#getInternalName() getInternalName}). @param name the field's name. @param desc the field's descriptor (see {@link Type Type}).


                // return object or null if the return type is void
                returnsObject(returnType, mv);
            } else { // interceptor in another class
                mv.visitVarInsn(ALOAD, 0);
                mv.visitFieldInsn(GETFIELD, this.generatedClassName, INTERCEPTOR + interceptorIndex ,
                        encodeClassDesc(interceptor.getClassName()));
                mv.visitVarInsn(ALOAD, 0);
                mv.visitMethodInsn(INVOKEVIRTUAL, interceptor.getClassName(),
                interceptor.getJMethod().getName(), interceptor.getJMethod().getDescriptor());
                // return object or null if the return type is void

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        // then, add call to original method, ie bean.businessMethod(i,j,...);
        mv.visitLabel(switchLabels[index++]);
        // get bean object
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, this.generatedClassName, "bean", this.beanClassDesc);


        // arguments of the method
        int indexArg = 0;
        for (Type argType : this.methodArgsType) {
            mv.visitVarInsn(ALOAD, 0);

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        // arguments of the method
        int indexArg = 0;
        for (Type argType : this.methodArgsType) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, this.generatedClassName, ARG + (indexArg++), argType.getDescriptor());
        }


        // Call to the renamed method only for AroundInvoke
        // LifeCycle interceptors call the original method
        String interceptedMethod = null;

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     */
    public void addInvocationContextGetContextData() {
        MethodVisitor mv = getCW().visitMethod(ACC_PUBLIC, "getContextData", "()Ljava/util/Map;", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, this.generatedClassName, "contextData", "Ljava/util/Map;");


            Label elseLabel = new Label();
            mv.visitJumpInsn(IFNONNULL, elseLabel);


            // if

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            // if
            mv.visitVarInsn(ALOAD, 0);
            mv.visitTypeInsn(NEW, "java/util/HashMap");
            mv.visitInsn(DUP);
            mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashMap", "<init>", "()V");
            mv.visitFieldInsn(PUTFIELD, this.generatedClassName, "contextData", "Ljava/util/Map;");


            // else
            mv.visitLabel(elseLabel);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, this.generatedClassName, "contextData", "Ljava/util/Map;");

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            mv.visitFieldInsn(PUTFIELD, this.generatedClassName, "contextData", "Ljava/util/Map;");


            // else
            mv.visitLabel(elseLabel);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, this.generatedClassName, "contextData", "Ljava/util/Map;");


            // return
            mv.visitInsn(ARETURN);


            mv.visitMaxs(0, 0);

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        // only for around invoke type
        if (this.interceptorType == AROUND_INVOKE) {


            // if (parameters == null) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, this.generatedClassName, "parameters", ARRAY_OBJECTS);
            // go to this label if not null
            Label notNullParametersLabel = new Label();
            mv.visitJumpInsn(IFNONNULL, notNullParametersLabel);


            // parameters = new Object[] {arg0, arg1, arg...};

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            int argCount = 0;
            for (Type type : this.methodArgsType) {
                mv.visitInsn(DUP);
                mv.visitIntInsn(BIPUSH, argCount);
                mv.visitVarInsn(ALOAD, 0);
                mv.visitFieldInsn(GETFIELD, this.generatedClassName, ARG + argCount, type.getDescriptor());
                // if type is not object type, need to convert it
                // for example : Integer.valueOf(i);
                transformPrimitiveIntoObject(type, mv);
                mv.visitInsn(AASTORE);
                argCount++;

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                mv.visitInsn(AASTORE);
                argCount++;
            }


            // store field
            mv.visitFieldInsn(PUTFIELD, this.generatedClassName, "parameters", ARRAY_OBJECTS);


            // not null label :
            // return parameters;
            mv.visitLabel(notNullParametersLabel);
            mv.visitVarInsn(ALOAD, 0);

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            // not null label :
            // return parameters;
            mv.visitLabel(notNullParametersLabel);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, this.generatedClassName, "parameters", ARRAY_OBJECTS);
        } else {
            // throw Exception
            mv.visitTypeInsn(NEW, "java/lang/IllegalStateException");
            mv.visitInsn(DUP);
            mv.visitLdcInsn("Operation getParameters can only be applied on AroundInvoke interceptors");

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