/*
* Copyright 2001-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.collections.functors;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import org.apache.commons.collections.FunctorException;
import org.apache.commons.collections.Transformer;
/**
* Transformer implementation that creates a new object instance by reflection.
*
* @since Commons Collections 3.0
* @version $Revision: 348444 $ $Date: 2005-11-23 14:06:56 +0000 (Wed, 23 Nov 2005) $
*
* @author Stephen Colebourne
*/
public class InstantiateTransformer implements Transformer, Serializable {
/** The serial version */
private static final long serialVersionUID = 3786388740793356347L;
/** Singleton instance that uses the no arg constructor */
public static final Transformer NO_ARG_INSTANCE = new InstantiateTransformer();
/** The constructor parameter types */
private final Class[] iParamTypes;
/** The constructor arguments */
private final Object[] iArgs;
/**
* Transformer method that performs validation.
*
* @param paramTypes the constructor parameter types
* @param args the constructor arguments
* @return an instantiate transformer
*/
public static Transformer getInstance(Class[] paramTypes, Object[] args) {
if (((paramTypes == null) && (args != null))
|| ((paramTypes != null) && (args == null))
|| ((paramTypes != null) && (args != null) && (paramTypes.length != args.length))) {
throw new IllegalArgumentException("Parameter types must match the arguments");
}
if (paramTypes == null || paramTypes.length == 0) {
return NO_ARG_INSTANCE;
} else {
paramTypes = (Class[]) paramTypes.clone();
args = (Object[]) args.clone();
}
return new InstantiateTransformer(paramTypes, args);
}
/**
* Constructor for no arg instance.
*/
private InstantiateTransformer() {
super();
iParamTypes = null;
iArgs = null;
}
/**
* Constructor that performs no validation.
* Use <code>getInstance</code> if you want that.
*
* @param paramTypes the constructor parameter types, not cloned
* @param args the constructor arguments, not cloned
*/
public InstantiateTransformer(Class[] paramTypes, Object[] args) {
super();
iParamTypes = paramTypes;
iArgs = args;
}
/**
* Transforms the input Class object to a result by instantiation.
*
* @param input the input object to transform
* @return the transformed result
*/
public Object transform(Object input) {
try {
if (input instanceof Class == false) {
throw new FunctorException(
"InstantiateTransformer: Input object was not an instanceof Class, it was a "
+ (input == null ? "null object" : input.getClass().getName()));
}
Constructor con = ((Class) input).getConstructor(iParamTypes);
return con.newInstance(iArgs);
} catch (NoSuchMethodException ex) {
throw new FunctorException("InstantiateTransformer: The constructor must exist and be public ");
} catch (InstantiationException ex) {
throw new FunctorException("InstantiateTransformer: InstantiationException", ex);
} catch (IllegalAccessException ex) {
throw new FunctorException("InstantiateTransformer: Constructor must be public", ex);
} catch (InvocationTargetException ex) {
throw new FunctorException("InstantiateTransformer: Constructor threw an exception", ex);
}
}
}