org.eclipse.nebula.widgets.compositetable.internal

Class DuckType

java.lang.Object

org.eclipse.nebula.widgets.compositetable.internal.DuckType

All Implemented Interfaces:

java.lang.reflect.InvocationHandler

Direct Known Subclasses:

RelaxedDuckType

public class DuckType
extends java.lang.Object
implements java.lang.reflect.InvocationHandler

DuckType. Implements Duck Typing for Java. ("If it walks like a duck, quacks like a duck, it..."). Essentially allows programs to treat objects from separate hierarchies as if they were designed with common interfaces as long as they adhere to common naming conventions.

This version is the strict DuckType. All methods present in interfaceToImplement must be present on the target object.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	DuckType.Wrapper Interface DuckType#Wrapper.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.Object	object
protected java.lang.Class	objectClass

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DuckType(java.lang.Object object)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj)
int	hashCode()
static java.lang.Object	implement(java.lang.Class interfaceToImplement, java.lang.Object object) Causes object to implement the interfaceToImplement and returns an instance of the object implementing interfaceToImplement even if interfaceToImplement was not declared in object.getClass()'s implements declaration.
static boolean	instanceOf(java.lang.Class intrface, java.lang.Object object) Indicates if object is a (DuckType) instace of intrface.
java.lang.Object	invoke(java.lang.Object proxy, java.lang.reflect.Method method, java.lang.Object[] args)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

object

protected java.lang.Object object

objectClass

protected java.lang.Class objectClass

Constructor Detail

DuckType

protected DuckType(java.lang.Object object)

Method Detail

implement

public static java.lang.Object implement(java.lang.Class interfaceToImplement,
                                         java.lang.Object object)

Causes object to implement the interfaceToImplement and returns an instance of the object implementing interfaceToImplement even if interfaceToImplement was not declared in object.getClass()'s implements declaration.

This works as long as all methods declared in interfaceToImplement are present on object.

Parameters:

interfaceToImplement - The Java class of the interface to implement

object - The object to force to implement interfaceToImplement

Returns:

object, but now implementing interfaceToImplement

instanceOf

public static boolean instanceOf(java.lang.Class intrface,
                                 java.lang.Object object)

Indicates if object is a (DuckType) instace of intrface. That is, is every method in intrface present on object.

Parameters:

intrface - The interface to implement

object - The object to test

Returns:

true if every method in intrface is present on object. false otherwise

invoke

public java.lang.Object invoke(java.lang.Object proxy,
                               java.lang.reflect.Method method,
                               java.lang.Object[] args)
                        throws java.lang.Throwable

Specified by:

invoke in interface java.lang.reflect.InvocationHandler

Throws:

java.lang.Throwable

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object