Examples of org.apache.tapestry.services.ClassTransformation

org.apache.tapestry.services.ClassTransformation
Contains class-specific information used when transforming an raw class into an executable class. Much of this information is somewhat like ordinary reflection, but applies to a class that has not yet been loaded.
Transformation is primarily about identifying annotations on fields and on methods and changing the class, adding new interfaces, fields and methods, and deleting some existing fields.
A ClassTransformation contains all the state data specific to a particular class being transformed. A number of workers will operate upon the ClassTransformation to effect the desired changes before the true class is loaded into memory.
Instances of this class are not designed to be thread safe, access to an instance should be restricted to a single thread. In fact, the design of this type is to allow stateless singletons in multiple threads to work on thread-specific data (within the ClassTransformation).
The majority of methods concern the declared members (field and methods) of a specific class, rather than any fields or methods inherited from a base class.


    @Test
    public void no_fields_with_annotation()
    {
        ApplicationStateManager manager = newApplicationStateManager();
        ClassTransformation ct = mockClassTransformation();
        MutableComponentModel model = mockMutableComponentModel();


        train_findFieldsWithAnnotation(ct, ApplicationState.class);


        replay();

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    public void no_path_annotation()
    {
        SymbolSource symbolSource = mockSymbolSource();
        AssetSource assetSource = mockAssetSource();
        ObjectLocator locator = mockObjectLocator();
        ClassTransformation ct = mockClassTransformation();
        MutableComponentModel model = mockMutableComponentModel();


        String fieldName = "myField";
        String fieldType = "java.lang.String";

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    public void path_annotation_present()
    {
        SymbolSource symbolSource = mockSymbolSource();
        AssetSource assetSource = mockAssetSource();
        ObjectLocator locator = mockObjectLocator();
        ClassTransformation ct = mockClassTransformation();
        MutableComponentModel model = mockMutableComponentModel();
        Path annotation = mockPath();


        String fieldName = "myField";
        String fieldType = "java.lang.Object";
        String value = "${foo}";
        String expanded = "foo.gif";


        train_getFieldAnnotation(ct, fieldName, Path.class, annotation);


        train_value(annotation, value);
        train_expandSymbols(symbolSource, value, expanded);


        train_addInjectedField(ct, AssetSource.class, "assetSource", assetSource, "as");
        train_getResourcesFieldName(ct, "rez");


        // This only tests that the code is generated as expected (which is a bit brittle), it
        // doesn't prove that the generated code actually works, but we have lots of integration
        // tests for that.


        ct
                .extendConstructor("myField = (java.lang.Object) as.findAsset(rez.getBaseResource(), \"foo.gif\", rez.getLocale());");


        ct.makeReadOnly(fieldName);


        replay();


        InjectionProvider provider = new AssetInjectionProvider(symbolSource, assetSource);

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    {
        Log log = mockLog();


        replay();


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


        assertEquals(ct.newMemberName("fred"), "_$fred");
        assertEquals(ct.newMemberName("fred"), "_$fred_0");


        // Here we're exposing a bit of the internal algorithm, which strips
        // off '$' and '_' before tacking "_$" in front.


        assertEquals(ct.newMemberName("_fred"), "_$fred_1");
        assertEquals(ct.newMemberName("_$fred"), "_$fred_2");
        assertEquals(ct.newMemberName("__$___$____$_fred"), "_$fred_3");


        // Here we're trying to force conflicts with existing declared
        // fields and methods of the class.


        assertEquals(ct.newMemberName("_parentField"), "_$parentField");
        assertEquals(ct.newMemberName("conflictField"), "_$conflictField_0");
        assertEquals(ct.newMemberName("conflictMethod"), "_$conflictMethod_0");


        verify();
    }

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    {
        Log log = mockLog();


        replay();


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


        assertEquals(ct.newMemberName("prefix", "fred"), "_$prefix_fred");
        assertEquals(ct.newMemberName("prefix", "fred"), "_$prefix_fred_0");


        // Here we're exposing a bit of the internal algorithm, which strips
        // off '$' and '_' before tacking "_$" in front.


        assertEquals(ct.newMemberName("prefix", "_fred"), "_$prefix_fred_1");
        assertEquals(ct.newMemberName("prefix", "_$fred"), "_$prefix_fred_2");
        assertEquals(ct.newMemberName("prefix", "__$___$____$_fred"), "_$prefix_fred_3");


        verify();
    }

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    {
        Log log = mockLog();


        replay();


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


        try
        {
            ct.getFieldAnnotation("unknownField", Retain.class);
            unreachable();
        }
        catch (RuntimeException ex)
        {
            assertEquals(

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    {
        Log log = mockLog();


        replay();


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


        Retain retain = ct.getFieldAnnotation("_annotatedField", Retain.class);


        assertNotNull(retain);


        verify();
    }

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    {
        Log log = mockLog();


        replay();


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


        // Field with annotations, but not that annotation
        assertNull(ct.getFieldAnnotation("_annotatedField", Override.class));


        // Field with no annotations
        assertNull(ct.getFieldAnnotation("_parentField", Override.class));


        verify();
    }

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    {
        Log log = mockLog();


        replay();


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


        List<String> fields = ct.findFieldsWithAnnotation(Retain.class);


        assertEquals(fields.size(), 1);
        assertEquals(fields.get(0), "_annotatedField");


        verify();

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    {
        Log log = mockLog();


        replay();


        ClassTransformation ct = createClassTransformation(FindFieldClass.class, log);


        checkFindFields(ct, "boolean", "_booleanValue");
        checkFindFields(ct, "int[]", "_intArrayValue");
        checkFindFields(ct, "java.lang.String", "_stringValue");
        checkFindFields(ct, "java.util.Date[]", "_dateArrayValue");

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