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java.lang.Objectorg.apache.commons.collections.FactoryUtils
FactoryUtils provides reference implementations and utilities
for the Factory functor interface. The supplied factories are:
| Constructor Summary | |
FactoryUtils()
This class is not normally instantiated. |
|
| Method Summary | |
static Factory |
constantFactory(Object constantToReturn)
Creates a Factory that will return the same object each time the factory is used. |
static Factory |
exceptionFactory()
Gets a Factory that always throws an exception. |
static Factory |
instantiateFactory(Class classToInstantiate)
Creates a Factory that can create objects of a specific type using a no-args constructor. |
static Factory |
instantiateFactory(Class classToInstantiate,
Class[] paramTypes,
Object[] args)
Creates a Factory that can create objects of a specific type using the arguments specified to this method. |
static Factory |
nullFactory()
Gets a Factory that will return null each time the factory is used. |
static Factory |
prototypeFactory(Object prototype)
Creates a Factory that will return a clone of the same prototype object each time the factory is used. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public FactoryUtils()
| Method Detail |
public static Factory exceptionFactory()
ExceptionFactorypublic static Factory nullFactory()
ConstantFactorypublic static Factory constantFactory(Object constantToReturn)
constantToReturn - the constant object to return each time in the factory
constant factory.ConstantFactorypublic static Factory prototypeFactory(Object prototype)
prototype - the object to clone each time in the factory
prototype factory
IllegalArgumentException - if the prototype is null
IllegalArgumentException - if the prototype cannot be clonedPrototypeFactorypublic static Factory instantiateFactory(Class classToInstantiate)
classToInstantiate - the Class to instantiate each time in the factory
reflection factory
IllegalArgumentException - if the classToInstantiate is nullInstantiateFactory
public static Factory instantiateFactory(Class classToInstantiate,
Class[] paramTypes,
Object[] args)
classToInstantiate - the Class to instantiate each time in the factoryparamTypes - parameter types for the constructor, can be nullargs - the arguments to pass to the constructor, can be null
reflection factory
IllegalArgumentException - if the classToInstantiate is null
IllegalArgumentException - if the paramTypes and args don't match
IllegalArgumentException - if the constructor doesn't existInstantiateFactory
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