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java.lang.Objectorg.apache.commons.collections.FactoryUtils
public class 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(java.lang.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(java.lang.Class classToInstantiate)
Creates a Factory that can create objects of a specific type using a no-args constructor. |
static Factory |
instantiateFactory(java.lang.Class classToInstantiate,
java.lang.Class[] paramTypes,
java.lang.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(java.lang.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(java.lang.Object constantToReturn)
constantToReturn - the constant object to return each time in the factory
constant factory.ConstantFactorypublic static Factory prototypeFactory(java.lang.Object prototype)
prototype - the object to clone each time in the factory
prototype factory
java.lang.IllegalArgumentException - if the prototype is null
java.lang.IllegalArgumentException - if the prototype cannot be clonedPrototypeFactorypublic static Factory instantiateFactory(java.lang.Class classToInstantiate)
classToInstantiate - the Class to instantiate each time in the factory
reflection factory
java.lang.IllegalArgumentException - if the classToInstantiate is nullInstantiateFactory
public static Factory instantiateFactory(java.lang.Class classToInstantiate,
java.lang.Class[] paramTypes,
java.lang.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
java.lang.IllegalArgumentException - if the classToInstantiate is null
java.lang.IllegalArgumentException - if the paramTypes and args don't match
java.lang.IllegalArgumentException - if the constructor doesn't existInstantiateFactory
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