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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002-2004 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
package org.apache.commons.collections;
import org.apache.commons.collections.functors.ConstantFactory;
import org.apache.commons.collections.functors.InstantiateFactory;
import org.apache.commons.collections.functors.ExceptionFactory;
import org.apache.commons.collections.functors.PrototypeFactory;
/**
* FactoryUtils provides reference implementations and utilities
* for the Factory functor interface. The supplied factories are:
*
*
Prototype - clones a specified object
*
Reflection - creates objects using reflection
*
Constant - always returns the same object
*
Null - always returns null
*
Exception - always throws an exception
*
* All the supplied factories are Serializable.
*
* @since Commons Collections 3.0
* @version $Revision: 1.12 $ $Date: 2004/01/14 21:43:04 $
*
* @author Stephen Colebourne
*/
public class FactoryUtils {
/**
* This class is not normally instantiated.
*/
public FactoryUtils() {
super();
}
/**
* Gets a Factory that always throws an exception.
* This could be useful during testing as a placeholder.
*
* @return the factory
*/
public static Factory exceptionFactory() {
return ExceptionFactory.INSTANCE;
}
/**
* Gets a Factory that will return null each time the factory is used.
* This could be useful during testing as a placeholder.
*
* @return the factory
*/
public static Factory nullFactory() {
return ConstantFactory.NULL_INSTANCE;
}
/**
* Creates a Factory that will return the same object each time the factory
* is used. No check is made that the object is immutable. In general, only
* immutable objects should use the constant factory. Mutable objects should
* use the prototype factory.
*
* @param constantToReturn the constant object to return each time in the factory
* @return the constant factory.
*/
public static Factory constantFactory(Object constantToReturn) {
return ConstantFactory.getInstance(constantToReturn);
}
/**
* Creates a Factory that will return a clone of the same prototype object
* each time the factory is used. The prototype will be cloned using one of these
* techniques (in order):
*
*
public clone method
*
public copy constructor
*
serialization clone
*
*
* @param prototype the object to clone each time in the factory
* @return the prototype factory
* @throws IllegalArgumentException if the prototype is null
* @throws IllegalArgumentException if the prototype cannot be cloned
*/
public static Factory prototypeFactory(Object prototype) {
return PrototypeFactory.getInstance(prototype);
}
/**
* Creates a Factory that can create objects of a specific type using
* a no-args constructor.
*
* @param classToInstantiate the Class to instantiate each time in the factory
* @return the reflection factory
* @throws IllegalArgumentException if the classToInstantiate is null
*/
public static Factory instantiateFactory(Class classToInstantiate) {
return InstantiateFactory.getInstance(classToInstantiate, null, null);
}
/**
* Creates a Factory that can create objects of a specific type using
* the arguments specified to this method.
*
* @param classToInstantiate the Class to instantiate each time in the factory
* @param paramTypes parameter types for the constructor, can be null
* @param args the arguments to pass to the constructor, can be null
* @return the reflection factory
* @throws IllegalArgumentException if the classToInstantiate is null
* @throws IllegalArgumentException if the paramTypes and args don't match
* @throws IllegalArgumentException if the constructor doesn't exist
*/
public static Factory instantiateFactory(Class classToInstantiate, Class[] paramTypes, Object[] args) {
return InstantiateFactory.getInstance(classToInstantiate, paramTypes, args);
}
}
