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UnmodifiableSortedBag.java
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/
UnmodifiableSortedBag.java
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/*
* Copyright 2003-2004 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.bag;
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.collections.SortedBag;
import org.apache.commons.collections.Unmodifiable;
import org.apache.commons.collections.iterators.UnmodifiableIterator;
/**
* Decorates another <code>SortedBag</code> to ensure it can't be altered.
*
* @since Commons Collections 3.0
* @version $Revision: 1.6 $ $Date: 2004/02/18 00:56:25 $
*
* @author Stephen Colebourne
*/
public final class UnmodifiableSortedBag
extends AbstractSortedBagDecorator implements Unmodifiable {
/**
* Factory method to create an unmodifiable bag.
*
* @param bag the bag to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
public static SortedBag decorate(SortedBag bag) {
if (bag instanceof Unmodifiable) {
return bag;
}
return new UnmodifiableSortedBag(bag);
}
//-----------------------------------------------------------------------
/**
* Constructor that wraps (not copies).
*
* @param bag the bag to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
private UnmodifiableSortedBag(SortedBag bag) {
super(bag);
}
//-----------------------------------------------------------------------
public Iterator iterator() {
return UnmodifiableIterator.decorate(getCollection().iterator());
}
public boolean add(Object object) {
throw new UnsupportedOperationException();
}
public boolean addAll(Collection coll) {
throw new UnsupportedOperationException();
}
public void clear() {
throw new UnsupportedOperationException();
}
public boolean remove(Object object) {
throw new UnsupportedOperationException();
}
public boolean removeAll(Collection coll) {
throw new UnsupportedOperationException();
}
public boolean retainAll(Collection coll) {
throw new UnsupportedOperationException();
}
}