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java.lang.Object | +--org.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()
public static Factory nullFactory()
public static Factory constantFactory(Object constantToReturn)
constantToReturn
- the constant object to return each time in the factoryconstant
factory.public static Factory prototypeFactory(Object prototype)
prototype
- the object to clone each time in the factoryprototype
factoryIllegalArgumentException
- if the prototype is nullIllegalArgumentException
- if the prototype cannot be clonedpublic static Factory instantiateFactory(Class classToInstantiate)
classToInstantiate
- the Class to instantiate each time in the factoryreflection
factoryIllegalArgumentException
- if the classToInstantiate is nullpublic 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 nullreflection
factoryIllegalArgumentException
- if the classToInstantiate is nullIllegalArgumentException
- if the paramTypes and args don't matchIllegalArgumentException
- if the constructor doesn't exist
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