Examples of org.apache.tapestry5.services.TransformMethodSignature

org.apache.tapestry5.services.TransformMethodSignature
A representation of a method signature, which consists of its name, modifiers (primarily, visibility), return type, parameter types, and declared exception types.
Types are stored as class names (or primitive names) because the signature is used with {@link ClassTransformation}(which operates on as-yet unloaded classes).

    private void replaceRead(ClassTransformation transformation, String fieldName, String fieldType,
                             String managerFieldName, String typeFieldName, boolean create)
    {
        String readMethodName = transformation.newMemberName("read", fieldName);


        TransformMethodSignature readMethodSignature = new TransformMethodSignature(Modifier.PRIVATE, fieldType,
                                                                                    readMethodName, null, null);


        String methodName = create ? "get" : "getIfExists";


        String body = format("return (%s) %s.%s(%s);", fieldType, managerFieldName, methodName, typeFieldName);

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        assertEquals(subclassFieldName, parentFieldName);


        // This proves the the field is protected and can be used in subclasses.


        ct.addMethod(new TransformMethodSignature(Modifier.PUBLIC, "java.lang.String", "getValue", null, null),
                     "return " + subclassFieldName + ";");


        ct.finish();


        Instantiator instantiator = ct.createInstantiator();

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    private void replaceAccessToField(InternalClassTransformation ct, String baseName)
    {
        String fieldName = "_" + baseName;
        String readMethodName = "_read_" + baseName;


        TransformMethodSignature readMethodSignature = new TransformMethodSignature(Modifier.PRIVATE, STRING_CLASS_NAME,
                                                                                    readMethodName, null, null);


        ct.addMethod(readMethodSignature, String.format("throw new RuntimeException(\"read %s\");", baseName));


        ct.replaceReadAccess(fieldName, readMethodName);


        String writeMethodName = "_write_" + baseName;


        TransformMethodSignature writeMethodSignature = new TransformMethodSignature(Modifier.PRIVATE, "void",
                                                                                     writeMethodName,
                                                                                     new String[] { STRING_CLASS_NAME },
                                                                                     null);
        ct.addMethod(writeMethodSignature, String.format("throw new RuntimeException(\"write %s\");", baseName));

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        replay();


        ClassTransformation ct = createClassTransformation(EventHandlerTarget.class, logger);


        OnEvent annotation = ct.getMethodAnnotation(new TransformMethodSignature("handler"), OnEvent.class);


        // Check that the attributes of the annotation match the expectation.


        assertEquals(annotation.value(), "fred");
        assertEquals(annotation.component(), "alpha");

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        ClassTransformation ct = createClassTransformation(ParentClass.class, logger);


        try
        {
            ct.getMethodAnnotation(new TransformMethodSignature("foo"), OnEvent.class);
            unreachable();
        }
        catch (IllegalArgumentException ex)
        {
            assertEquals(ex.getMessage(),

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    @Test
    public void prefix_method() throws Exception
    {
        Logger logger = mockLogger();
        TransformMethodSignature sig = new TransformMethodSignature(Modifier.PUBLIC, "int", "getParentField", null,
                                                                    null);


        replay();


        InternalClassTransformation ct = createClassTransformation(ParentClass.class, logger);

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    @Test
    public void fields_in_prefixed_methods_are_transformed() throws Exception
    {
        Logger logger = mockLogger();
        TransformMethodSignature sig = new TransformMethodSignature(Modifier.PUBLIC, "int", "getTargetValue", null,
                                                                    null);
        Runnable runnable = mockRunnable();


        runnable.run();


        replay();


        InternalClassTransformation ct = createClassTransformation(MethodPrefixTarget.class, logger);


        String name = ct.addInjectedField(Runnable.class, "runnable", runnable);


        // Transform the field.


        TransformMethodSignature reader = new TransformMethodSignature(Modifier.PRIVATE, "int", "read_target_value",
                                                                       null, null);


        ct.addMethod(reader, "return 66;");


        ct.replaceReadAccess("_targetField", "read_target_value");

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    @Test
    public void extend_existing_method_fields_are_transformed() throws Exception
    {
        Logger logger = mockLogger();
        TransformMethodSignature sig = new TransformMethodSignature(Modifier.PUBLIC, "int", "getTargetValue", null,
                                                                    null);
        Runnable runnable = mockRunnable();


        runnable.run();


        replay();


        InternalClassTransformation ct = createClassTransformation(MethodPrefixTarget.class, logger);


        String name = ct.addInjectedField(Runnable.class, "runnable", runnable);


        // Transform the field.


        TransformMethodSignature reader = new TransformMethodSignature(Modifier.PRIVATE, "int", "read_target_value",
                                                                       null, null);


        ct.addMethod(reader, "return 66;");


        ct.replaceReadAccess("_targetField", "read_target_value");

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    @Test
    public void invalid_code() throws Exception
    {
        Logger logger = mockLogger();
        TransformMethodSignature sig = new TransformMethodSignature(Modifier.PUBLIC, "int", "getParentField", null,
                                                                    null);


        replay();


        InternalClassTransformation ct = createClassTransformation(ParentClass.class, logger);

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        List<TransformMethodSignature> sigs = ct.findMethodsWithAnnotation(OnEvent.class);


        assertEquals(sigs.size(), 1);


        TransformMethodSignature sig = sigs.get(0);


        assertEquals(ct.getMethodIdentifier(sig),
                     "org.apache.tapestry5.internal.transform.pages.MethodIdentifier.makeWaves(java.lang.String, int[]) (at MethodIdentifier.java:24)");


        verify();

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