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Commons Collections example source code file (UnmodifiableList.java)

This example Commons Collections source code file (UnmodifiableList.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

abstractserializablelistdecorator, collection, iterator, list, list, listiterator, object, object, unmodifiable, unmodifiablelist, unmodifiablelist, unsupportedoperationexception, unsupportedoperationexception, util

The Commons Collections UnmodifiableList.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.list;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import org.apache.commons.collections.Unmodifiable;
import org.apache.commons.collections.iterators.UnmodifiableIterator;
import org.apache.commons.collections.iterators.UnmodifiableListIterator;

/**
 * Decorates another <code>List to ensure it can't be altered.
 * <p>
 * This class is Serializable from Commons Collections 3.1.
 *
 * @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 UnmodifiableList
        extends AbstractSerializableListDecorator
        implements Unmodifiable {

    /** Serialization version */
    private static final long serialVersionUID = 6595182819922443652L;

    /**
     * Factory method to create an unmodifiable list.
     * 
     * @param list  the list to decorate, must not be null
     * @throws IllegalArgumentException if list is null
     */
    public static List decorate(List list) {
        if (list instanceof Unmodifiable) {
            return list;
        }
        return new UnmodifiableList(list);
    }

    //-----------------------------------------------------------------------
    /**
     * Constructor that wraps (not copies).
     * 
     * @param list  the list to decorate, must not be null
     * @throws IllegalArgumentException if list is null
     */
    private UnmodifiableList(List list) {
        super(list);
    }

    //-----------------------------------------------------------------------
    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();
    }

    //-----------------------------------------------------------------------
    public ListIterator listIterator() {
        return UnmodifiableListIterator.decorate(getList().listIterator());
    }

    public ListIterator listIterator(int index) {
        return UnmodifiableListIterator.decorate(getList().listIterator(index));
    }

    public void add(int index, Object object) {
        throw new UnsupportedOperationException();
    }

    public boolean addAll(int index, Collection coll) {
        throw new UnsupportedOperationException();
    }

    public Object remove(int index) {
        throw new UnsupportedOperationException();
    }

    public Object set(int index, Object object) {
        throw new UnsupportedOperationException();
    }

    public List subList(int fromIndex, int toIndex) {
        List sub = getList().subList(fromIndex, toIndex);
        return new UnmodifiableList(sub);
    }

}

Other Commons Collections examples (source code examples)

Here is a short list of links related to this Commons Collections UnmodifiableList.java source code file:



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