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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.util;
import java.util.ArrayList;
import java.util.List;
import net.sf.jasperreports.engine.JRCloneable;
/**
* Cloning related utility methods.
*
* @author Lucian Chirita ([email protected])
*/
public final class JRCloneUtils
{
/**
* Clones an object after checking whether the argument is null.
*
* @param original the object to be cloned
* @return a clone of the argument, or null
if the argument was
* null
*/
public static T nullSafeClone(T original)
{
return original == null ? null : (T)original.clone();
}
/**
* Clones a list of objects.
*
* The list elements are assumed to implement {@link JRCloneable}.
*
* @param items the list to clone
* @return a new list which contains clones of the elements in the original list
*/
public static List cloneList(List items)
{
List clone;
if (items == null)
{
clone = null;
}
else
{
clone = new ArrayList(items.size());
for (T item : items)
{
clone.add(JRCloneUtils.nullSafeClone(item));
}
}
return clone;
}
/**
* Clones a list of objects.
*
* The list elements are assumed to implement {@link JRCloneable}.
*
* @param items the list to clone
* @return a new list which contains clones of the elements in the original list
*/
public static T[] cloneArray(T[] items)
{
T[] clone;
if (items == null)
{
clone = null;
}
else
{
clone = items.clone();
List list = new ArrayList(items.length);
for (T item : items)
{
list.add(JRCloneUtils.nullSafeClone(item));
}
clone = list.toArray(clone);
}
return clone;
}
private JRCloneUtils()
{
}
}