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GenericUtils.java
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GenericUtils.java
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/*
* SNE-XACML: A high performance XACML evaluation engine.
*
* Copyright (C) 2013-2014 Canh Ngo <canhnt@gmail.com>
* System and Network Engineering Group, University of Amsterdam.
* All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3.0 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
package nl.uva.sne.midd.util;
import nl.uva.sne.midd.MIDDException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
* @author Canh Ngo
* @since 2014-07-04
*/
public class GenericUtils {
@SuppressWarnings("unchecked")
public static <T> T newInstance(final T value, Class<?> clsType) throws MIDDException {
if (value == null) {
throw new MIDDException("Cannot copy null value");
}
Constructor<?> copyConstructor = null;
try {
copyConstructor = clsType.getConstructor(clsType);
return (T) copyConstructor.newInstance(value);
} catch (InvocationTargetException | InstantiationException | IllegalAccessException e) {
throw new MIDDException("Failed to construct class " + clsType.toString(), e);
} catch (NoSuchMethodException e) {
// use shallow copy if no copy constructor is found
return value;
}
}
/**
* Create a new object of type <code>T</code>, which is cloned from <code>value</code>.
* The equivalent class copy constructor is invoked.
* @param value
* @param <T>
* @return
* @throws MIDDException
*/
public static <T> T newInstance(final T value) throws MIDDException {
if (value == null) {
return null;
} else {
return newInstance(value, value.getClass());
}
}
}