Examples of org.apache.hivemind.lib.util.AdapterRegistry

org.apache.hivemind.lib.util.AdapterRegistry
An implementation of the adapter pattern. The adapter pattern allows new functionality to be assigned to an existing class. As implemented here, this is a smart lookup between a particular class (the class to be adapted, called the subject class) and some object instance that can provide the extra functionality (called the adapter). The implementation of the adapter is not relevant to the adapterRegistry class.
adapters are registered before they can be used; the registration maps a particular class to an adapter instance. The adapter instance will be used when the subject class matches the registered class, or the subject class inherits from the registered class.
This means that a search must be made that walks the inheritance tree (upwards from the subject class) to find a registered mapping.
In addition, adapters can be registered against interfaces. Searching of interfaces occurs after searching of classes. The exact order is:
- Search for the subject class, then each super-class of the subject class (excluding java.lang.Object)
- Search interfaces, starting with interfaces implemented by the subject class, continuing with interfaces implemented by the super-classes, then interfaces extended by earlier interfaces (the exact order is a bit fuzzy)
- Search for a match for java.lang.Object, if any
The first match terminates the search.
The AdapterRegistry caches the results of search; a subsequent search for the same subject class will be resolved immediately.
AdapterRegistry does a minor tweak of the "natural" inheritance. Normally, the parent class of an object array (i.e., Foo[]) is simply Object, even though you may assign Foo[] to a variable of type Object[]. AdapterRegistry "fixes" this by searching for Object[] as if it was the superclass of any object array. This means that the search path for Foo[] is Foo[], Object[], then a couple of interfaces {@link java.lang.Cloneable}, {@link java.io.Serializable}, etc. that are implicitily implemented by arrays), and then, finally, Object
This tweak doesn't apply to arrays of primitives, since such arrays may not be assigned to Object[]. @author Howard M. Lewis Ship @see org.apache.hivemind.lib.util.AdapterRegistryImpl @since 1.1

    private ClassFactory _classFactory;


    public Object createCoreServiceImplementation(
            ServiceImplementationFactoryParameters factoryParameters)
    {
        AdapterRegistry ar = new AdapterRegistryImpl();


        buildAdapterRegistry(factoryParameters, ar);


        Class implClass = buildImplementationClass(factoryParameters);

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        return buildParameter(registerClass, adapter, null, null);
    }


    public void testBuildRegistry()
    {
        AdapterRegistry ar = (AdapterRegistry) newMock(AdapterRegistry.class);
        ToStringAdapter adapter = (ToStringAdapter) newMock(ToStringAdapter.class);


        MockControl fpc = newControl(ServiceImplementationFactoryParameters.class);
        ServiceImplementationFactoryParameters fp = (ServiceImplementationFactoryParameters) fpc
                .getMock();


        fp.getServiceInterface();
        fpc.setReturnValue(ToStringAdapter.class);


        AdapterRegistryParameter p = buildParameter(Number.class, adapter);


        fp.getFirstParameter();
        fpc.setReturnValue(p);


        ar.register(Number.class, adapter);


        replayControls();


        new AdapterRegistryFactory().buildAdapterRegistry(fp, ar);

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    public void testBuildRegistryWrongAdapterType()
    {
        Location l = fabricateLocation(3);


        AdapterRegistry ar = (AdapterRegistry) newMock(AdapterRegistry.class);
        ToStringAdapter adapter = (ToStringAdapter) newMock(ToStringAdapter.class);


        MockControl fpc = newControl(ServiceImplementationFactoryParameters.class);
        ServiceImplementationFactoryParameters fp = (ServiceImplementationFactoryParameters) fpc
                .getMock();

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public class TestAdaptorRegistry extends HiveMindTestCase
{


    private AdapterRegistry build()
    {
        AdapterRegistry result = new AdapterRegistryImpl();


        result.register(Object.class, "OBJECT");
        result.register(Object[].class, "OBJECT[]");
        result.register(String.class, "STRING");
        result.register(List.class, "LIST");
        result.register(Map.class, "MAP");
        result.register(Serializable.class, "SERIALIZABLE");
        result.register(int[].class, "INT[]");
        result.register(double.class, "DOUBLE");
        result.register(Number[].class, "NUMBER[]");


        return result;
    }

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        expect("OBJECT", Object.class);
    }


    public void testNoMatch()
    {
        AdapterRegistry r = new AdapterRegistryImpl();


        r.register(String.class, "STRING");


        try
        {
            r.getAdapter(Boolean.class);


            unreachable();
        }
        catch (IllegalArgumentException ex)
        {

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        }
    }


    public void testToString()
    {
        AdapterRegistry r = new AdapterRegistryImpl();


        r.register(String.class, "STRING");


        assertEquals("AdaptorRegistry[java.lang.String=STRING]", r.toString());
    }

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        assertEquals("AdaptorRegistry[java.lang.String=STRING]", r.toString());
    }


    public void testDuplicateRegistration()
    {
        AdapterRegistry r = new AdapterRegistryImpl();


        r.register(String.class, "STRING");


        try
        {
            r.register(String.class, "STRING2");


            unreachable();
        }
        catch (IllegalArgumentException ex)
        {

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Related Classes of org.apache.hivemind.lib.util.AdapterRegistry

org.apache.hivemind.lib.adapter.AdapterRegistryFactory

org.apache.hivemind.lib.adapter.TestAdapterRegistryFactory

org.apache.hivemind.lib.util.TestAdaptorRegistry

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