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Commons Collections example source code file (UnmodifiableOrderedMapIterator.java)

This example Commons Collections source code file (UnmodifiableOrderedMapIterator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

illegalargumentexception, object, object, orderedmapiterator, orderedmapiterator, unmodifiable, unmodifiableorderedmapiterator, unmodifiableorderedmapiterator, unsupportedoperationexception, unsupportedoperationexception

The Commons Collections UnmodifiableOrderedMapIterator.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.iterators;

import org.apache.commons.collections.OrderedMapIterator;
import org.apache.commons.collections.Unmodifiable;

/** 
 * Decorates an ordered map iterator such that it cannot be modified.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 */
public final class UnmodifiableOrderedMapIterator implements OrderedMapIterator, Unmodifiable {

    /** The iterator being decorated */
    private OrderedMapIterator iterator;

    //-----------------------------------------------------------------------
    /**
     * Decorates the specified iterator such that it cannot be modified.
     *
     * @param iterator  the iterator to decorate
     * @throws IllegalArgumentException if the iterator is null
     */
    public static OrderedMapIterator decorate(OrderedMapIterator iterator) {
        if (iterator == null) {
            throw new IllegalArgumentException("OrderedMapIterator must not be null");
        }
        if (iterator instanceof Unmodifiable) {
            return iterator;
        }
        return new UnmodifiableOrderedMapIterator(iterator);
    }
    
    //-----------------------------------------------------------------------
    /**
     * Constructor.
     *
     * @param iterator  the iterator to decorate
     */
    private UnmodifiableOrderedMapIterator(OrderedMapIterator iterator) {
        super();
        this.iterator = iterator;
    }

    //-----------------------------------------------------------------------
    public boolean hasNext() {
        return iterator.hasNext();
    }

    public Object next() {
        return iterator.next();
    }

    public boolean hasPrevious() {
        return iterator.hasPrevious();
    }

    public Object previous() {
        return iterator.previous();
    }

    public Object getKey() {
        return iterator.getKey();
    }

    public Object getValue() {
        return iterator.getValue();
    }

    public Object setValue(Object value) {
        throw new UnsupportedOperationException("setValue() is not supported");
    }

    public void remove() {
        throw new UnsupportedOperationException("remove() is not supported");
    }

}

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