/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 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 name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``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
* INTALIO, INC. 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 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2003 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
*
* Date Author Changes
* 04/21/2003 Keith Visco Created
*/
package org.exolab.castor.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import org.exolab.castor.core.exceptions.CastorIllegalStateException;
/**
* The default implementation of ObjectFactory used for
* creating class instances
*
* @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
* @version $Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
* @see ObjectFactory
*/
public class DefaultObjectFactory implements ObjectFactory {
/**
* Creates a default instance of the given class.
*
* @param type the Class to create an instance of
* @return the new instance of the given class
*/
public Object createInstance(Class type)
throws IllegalAccessException, InstantiationException
{
return createInstance(type, null, null);
} //-- createInstance
/**
* Creates a default instance of the given class.
*
* @param type the Class to create an instance of
* @param args the array of arguments to pass to the Class constructor
* @return the new instance of the given class
*/
public Object createInstance(Class type, Object[] args)
throws IllegalAccessException, InstantiationException
{
return createInstance(type, null, args);
} //-- createInstance
/**
* Creates a default instance of the given class.
*
* @param type the Class to create an instance of
* @param argTypes the Class types for each argument, used
* to find the correct constructor
* @param args the array of arguments to pass to the Class constructor
* @return the new instance of the given class
*/
public Object createInstance(Class type, Class[] argTypes, Object[] args)
throws IllegalAccessException, InstantiationException
{
if ((args == null) || (args.length == 0)) {
if (java.util.Date.class.isAssignableFrom(type)) {
return handleDates(type);
}
return type.newInstance();
}
argTypes = checkArguments(argTypes, args);
return instantiateUsingConstructor(type, argTypes, args);
} //-- createInstance
/**
* Create a new instance of the given type by calling a public constructor
* of this class, passing the given arguments to the constructor call.
* @param type The class type to instantiate
* @param argTypes Argument types.
* @param args Arguments (to be used as parameters to the constructor class).
* @return An instance of the class type provided
* @throws InstantiationException If the given class type does not expose a constructor
* with the given number of argument (types).
* @throws IllegalAccessException If the given constructor failed during invocation.
*/
private Object instantiateUsingConstructor(Class type, Class[] argTypes, Object[] args) throws InstantiationException, IllegalAccessException {
try {
Constructor cons = type.getConstructor(argTypes);
return cons.newInstance(args);
}
catch(java.lang.NoSuchMethodException nsmx) {
String err = "unable to find matching public constructor for class: " + type.getName();
err += " with argument types: ";
for (int i = 0; i < argTypes.length; i++) {
if (i > 0) err += ", ";
err += argTypes[i].getName();
}
throw new InstantiationException(err);
} catch(InvocationTargetException ite) {
throw new CastorIllegalStateException(
ite.getMessage(), ite.getTargetException());
}
}
/**
* Check the arguments (incl. argument types, if provided) for consistency, and
* deduce argument types if not provided.
* @param argTypes Argumemnt types.
* @param args Arguments
* @return A class array for the argument types provided.
*/
private Class[] checkArguments(Class[] argTypes, Object[] args) {
if (argTypes == null) {
argTypes = new Class[args.length];
for (int i = 0; i < args.length; i++) {
if (args[i] != null) {
argTypes[i] = args[i].getClass();
} else {
String err = "null arguments to constructor not accepted " +
"if the 'argTypes' array is null.";
throw new IllegalStateException(getClass().getName() + ": " + err);
}
}
} else if (argTypes.length != args.length) {
String err = "The argument type array must be the same length as argument value array.";
throw new IllegalArgumentException(getClass().getName() + ": " + err);
}
return argTypes;
}
/**
* Handles 'Date' types in a special way.
* @param type The Class type
* @return A new instance of the type given
* @throws InstantiationException If the given class type cannot be successfully instantiated.
* @throws IllegalAccessException If the given constructor failed during invocation.
*/
private Object handleDates(Class type)
throws IllegalAccessException, InstantiationException
{
java.util.Date date = new java.util.Date();
if (java.util.Date.class == type) {
return date;
}
else if (java.sql.Date.class == type) {
long time = date.getTime();
return new java.sql.Date(time);
}
else if (java.sql.Time.class == type) {
long time = date.getTime();
return new java.sql.Time(time);
}
else if (java.sql.Timestamp.class == type) {
long time = date.getTime();
return new java.sql.Timestamp(time);
}
else {
return type.newInstance();
}
} //-- handleDates
} //-- DefaultObjectFactory