Examples of org.apache.tapestry5.ioc.services.ClassFab

Package org.apache.tapestry5.ioc.services

Examples of org.apache.tapestry5.ioc.services.ClassFab

org.apache.tapestry5.ioc.services.ClassFab
.org/products/javassist">Javassist home page.
Method bodies look largely like Java. References to java classes must be fully qualified. Several special variables are used:
- $0 first parameter, equivalent to this in Java code (and can't be used when creating a static method)
- $1, $2, ... actual parameters to the method
- $args all the parameters as an Object[]
- $r the return type of the method, typically used as return ($r) .... $r is valid with method that return void. This also handles conversions between wrapper types and primitive types.
- $w conversion from primitive type to wrapper type, used as ($w) foo() where foo() returns a primitive type and a wrapper type is needed
ClassFab instances are not thread safe.
ClassFab instances are created by a {@link org.apache.tapestry5.ioc.services.ClassFactory}. @deprecated In 5.3, use {@link PlasticProxyFactory} instead

        verify();
    }


    private Class createSyntheticMethodModuleClass() throws NoSuchMethodException
    {
        ClassFab fab = classFactory.newClass("EnhancedSyntheticMethodModule", SyntheticMethodModule.class);


        int modifiers = Modifier.PUBLIC | AccessFlag.SYNTHETIC;


        // choose arbitrary signature


        MethodSignature signature = new MethodSignature(List.class.getMethod("size"));


        fab.addMethod(modifiers, signature, "return 0;");


        Class moduleClass = fab.createClass();


        // make sure we really managed to create a synthetic method


        assertTrue(moduleClass.getMethod("size").isSynthetic());

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    }


    @Test
    public void create_simple_bean() throws Exception
    {
        ClassFab cf = newClassFab("TargetBean", Object.class);


        cf.addField("_stringValue", String.class);


        MethodSignature setStringValue = new MethodSignature(void.class, "setStringValue", new Class[] { String.class },
                                                             null);


        cf.addMethod(Modifier.PUBLIC, setStringValue, "_stringValue = $1;");


        MethodSignature getStringValue = new MethodSignature(String.class, "getStringValue", null, null);


        cf.addMethod(Modifier.PUBLIC, getStringValue, "return _stringValue;");


        Class targetClass = cf.createClass();


        Object targetBean = targetClass.newInstance();


        access.set(targetBean, "stringValue", "Fred");

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    }


    @Test
    public void add_to_string() throws Exception
    {
        ClassFab cf = newClassFab("ToString", Object.class);


        cf.addToString("ToString Description");


        Class clazz = cf.createClass();


        Object instance = clazz.newInstance();


        assertEquals(instance.toString(), "ToString Description");
    }

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    }


    @Test
    public void proxy_methods_to_delegate() throws Exception
    {
        ClassFab cf = newClassFab("Delegator", Object.class);


        cf.addField("_delegate", SampleService.class);
        cf.addConstructor(new Class[] { SampleService.class }, null, "_delegate = $1;");


        cf.proxyMethodsToDelegate(SampleService.class, "_delegate", "<Delegator>");


        SampleService delegate = newMock(SampleService.class);


        Class clazz = cf.createClass();


        SampleService proxy = (SampleService) clazz.getConstructors()[0].newInstance(delegate);


        expect(delegate.primitiveMethod(5)).andReturn(10);

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    }


    @Test
    public void proxy_methods_to_delegate_with_to_string() throws Exception
    {
        ClassFab cf = newClassFab("ToStringDelegator", Object.class);


        cf.addField("_delegate", ToStringService.class);
        cf.addConstructor(new Class[] { ToStringService.class }, null, "_delegate = $1;");


        cf.proxyMethodsToDelegate(ToStringService.class, "_delegate", "<ToStringDelegator>");


        ToStringService delegate = new ToStringService()
        {
            @Override
            public String toString()
            {
                return "ACTUAL TO-STRING";
            }
        };


        Class clazz = cf.createClass();


        ToStringService proxy = (ToStringService) clazz.getConstructors()[0].newInstance(delegate);


        assertEquals(proxy.toString(), "ACTUAL TO-STRING");
    }

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    }


    @Test
    public void add_constructor() throws Exception
    {
        ClassFab cf = newClassFab("ConstructableBean", Object.class);


        cf.addField("_stringValue", String.class);
        cf.addConstructor(new Class[] { String.class }, null, "{ _stringValue = $1; }");


        MethodSignature getStringValue = new MethodSignature(String.class, "getStringValue", null, null);


        cf.addMethod(Modifier.PUBLIC, getStringValue, "return _stringValue;");


        Class targetClass = cf.createClass();


        try
        {
            targetClass.newInstance();
            unreachable();

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    }


    @Test
    public void add_constructor_from_base_class() throws Exception
    {
        ClassFab cf = newClassFab("MyIntHolder", AbstractIntWrapper.class);


        cf.addField("_intValue", int.class);
        cf.addConstructor(new Class[] { int.class }, null, "{ _intValue = $1; }");


        cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getIntValue", null, null), "return _intValue;");


        Class targetClass = cf.createClass();
        Constructor c = targetClass.getConstructors()[0];


        AbstractIntWrapper targetBean = (AbstractIntWrapper) c.newInstance(new Object[] { new Integer(137) });


        assertEquals(targetBean.getIntValue(), 137);

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    }


    @Test
    public void invalid_super_class() throws Exception
    {
        ClassFab cf = newClassFab("InvalidSuperClass", List.class);


        try
        {
            cf.createClass();
            unreachable();
        }
        catch (RuntimeException ex)
        {
            assertExceptionSubstring(ex, "Unable to create class InvalidSuperClass");

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    }


    @Test
    public void add_interface() throws Exception
    {
        ClassFab cf = newClassFab("SimpleService", Object.class);


        cf.addInterface(SimpleService.class);


        cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "add", new Class[] { int.class, int.class }, null),
                     "return $1 + $2;");


        Class targetClass = cf.createClass();


        SimpleService s = (SimpleService) targetClass.newInstance();


        assertEquals(207, s.add(99, 108));
    }

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    }


    @Test
    public void attempt_to_subclass_from_final_class() throws Exception
    {
        ClassFab cf = newClassFab("StringSubclass", String.class);


        try
        {
            cf.createClass();
        }
        catch (RuntimeException ex)
        {
            assertExceptionRegexp(ex, "Unable to create class StringSubclass\\: .*");
        }

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