package it.unimi.dsi.lang;
import java.lang.reflect.Array;
/*
* DSI utilities
*
* Copyright (C) 2006-2009 Paolo Boldi and Sebastiano Vigna
*
* 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 2.1 of the License, or (at your option)
* 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/** A class providing static methods and objects that do useful things
* with {@linkplain it.unimi.dsi.lang.FlyweightPrototype flyweight protoypes}.
*/
public class FlyweightPrototypes {
protected FlyweightPrototypes() {}
/** Creates a flyweight copy of an array of {@linkplain it.unimi.dsi.lang.FlyweightPrototype flyweight prototypes}.
*
* @param <T> the type of {@link FlyweightPrototype} you want to copy, that is, the
* type of the elements of <code>prototype</code>.
* @param prototype an array of prototypes.
* @return a flyweight copy of <code>prototype</code>, obtained by invoking
* {@link FlyweightPrototype#copy()} on each element.
*/
@SuppressWarnings("unchecked")
public static <T extends FlyweightPrototype<T>> T[] copy( final T[] prototype ) {
final T[] result = (T[])Array.newInstance( prototype.getClass().getComponentType(), prototype.length );
for( int i = 0; i < result.length; i++ ) result[ i ] = prototype[ i ].copy();
return result;
}
/** Creates a flyweight copy of the given object, or returns <code>null</code> if the given object is <code>null</code>.
*
* @param <T> the type of {@link FlyweightPrototype} you want to copy, that is, the
* type of <code>prototype</code>.
* @param prototype a prototype to be copied, or <code>null</code>.
* @return <code>null</code>, if <code>prototype</code> is <code>null</code>;
* otherwise,a flyweight copy of <code>prototype</code>.
*/
public static <T extends FlyweightPrototype<T>> T copy( final T prototype ) {
return prototype != null ? prototype.copy() : null;
}
}