Examples of ClassFab

org.apache.hivemind.service.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
@author Howard Lewis Ship
org.apache.tapestry.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.tapestry.ioc.services.ClassFactory}.
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

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


        ClassFactory factory = new ClassFactoryImpl();


        Class clazz = SimpleBean.class;


        ClassFab cf = factory.newClass(clazz.getName() + "$$Proxy", clazz);


        cf.addInterface(Serializable.class);


        Class proxyClass = cf.createClass();


        SimpleBean simple = (SimpleBean) proxyClass.newInstance();


        assertTrue(simple instanceof Serializable);

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

            // The access object is created in the same package as the component, so that it can access
            // protected and package private methods.
            String accessClassName = String.format("%s$MethodAccess_%s_%s", getClassName(), sig.getMethodName(),
                    ClassFabUtils.nextUID());


            ClassFab cf = classFactory.newClass(accessClassName, AbstractMethodAccess.class);


            cf.addMethod(Modifier.PUBLIC, INVOKE_SIGNATURE, body);


            cf.addToString(String.format("MethodAccess[method %s of class %s]", sig.getMediumDescription(),
                    getClassName()));


            Class accessClass = cf.createClass();


            try
            {
                Object accessInstance = accessClass.newInstance();

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

        }


        private org.apache.tapestry5.services.FieldAccess createFieldAccess(TransformMethod reader,
                TransformMethod writer)
        {
            ClassFab cf = classFactory.newClass(org.apache.tapestry5.services.FieldAccess.class);


            addFieldAccessReadMethod(cf, reader);
            addFieldAccessWriteMethod(cf, writer);


            cf.addToString(String.format("FieldAccess<%s.%s>", getClassName(), name));


            Class accessClass = cf.createClass();


            try
            {
                return (org.apache.tapestry5.services.FieldAccess) accessClass.newInstance();
            }

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


        String componentClassName = getClassName();


        String name = ClassFabUtils.generateClassName("Instantiator");


        ClassFab cf = classFactory.newClass(name, AbstractInstantiator.class);


        Object[] componentConstructorArgs = constructorArgs.toArray(new Object[constructorArgs.size()]);


        cf.addConstructor(new Class[]
        { ComponentModel.class, String.class, Object[].class }, null, "super($1, $2, $3);");


        // Pass $1 (the InternalComponentResources object) and the constructorArgs (from the AbstractIntantiator
        // base class) into the new component instance's constructor


        cf.addMethod(Modifier.PUBLIC, NEW_INSTANCE_SIGNATURE,
                String.format("return new %s($1, constructorArgs);", componentClassName));


        Class instantiatorClass = cf.createClass();


        try
        {
            Object instance = instantiatorClass.getConstructors()[0].newInstance(componentModel,
                    String.format("Instantiator[%s]", componentClassName), componentConstructorArgs);

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

    }


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

    }


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

    }


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

    }


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

    }


    @Test
    public void create_class_within_non_default_package() throws Exception
    {
        ClassFab cf = newClassFab("org.apache.hivemind.InPackage", Object.class);


        Class c = cf.createClass();


        Object o = c.newInstance();


        assertEquals("org.apache.hivemind.InPackage", o.getClass().getName());
    }

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

    }


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


        cf.addInterface(Runnable.class);


        try
        {
            cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "run", null, null), "fail;");
        }
        catch (RuntimeException ex)
        {
            assertExceptionSubstring(ex, "Unable to add method void run() to class BadMethodBody:");
        }

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