com.sun.javafx.UnmodifiableArrayList Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package com.sun.javafx;
import java.util.AbstractList;
import java.util.RandomAccess;
/**
* An unmodifiable array-based List implementation. This is essentially like the
* package private UnmodifiableRandomAccessList of the JDK, and helps us to
* avoid having to do a lot of conversion work when we want to pass an array
* into an unmodifiable list implementation (otherwise we would have to create
* a temporary list that is then passed to Collections.unmodifiableList).
*/
public class UnmodifiableArrayList extends AbstractList implements RandomAccess {
private T[] elements;
private final int size;
/**
* The given elements are used directly (a defensive copy is not made),
* and the given size is used as the size of this list. It is the callers
* responsibility to make sure the size is accurate.
*
* @param elements The elements to use.
* @param size The size must be <= the length of the elements array
*/
public UnmodifiableArrayList(T[] elements, int size) {
assert elements == null ? size == 0 : size <= elements.length;
this.size = size;
this.elements = elements;
}
@Override public T get(int index) {
return elements[index];
}
@Override public int size() {
return size;
}
}