readonlylist.java

来自「spam source codejasen-0.9jASEN - java An」· Java 代码 · 共 231 行

/*
 * @(#)ReadOnlyList.java	31/01/2005
 *
 * Copyright (c) 2004, 2005  jASEN.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in
 *      the documentation and/or other materials provided with the distribution.
 *
 *   3. The names of the authors may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *   4. Any modification or additions to the software must be contributed back
 *      to the project.
 *
 *   5. Any investigation or reverse engineering of source code or binary to
 *      enable emails to bypass the filters, and hence inflict spam and or viruses
 *      onto users who use or do not use jASEN could subject the perpetrator to
 *      criminal and or civil liability.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JASEN.ORG,
 * OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
package org.jasen.util;

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

/**
 * <P>
 * 	A simple List implementation which does not allow modification.
 * </P>
 * @author Jason Polites
 */
public class ReadOnlyList implements List
{
    List target;
    
    private static final String ILLEGAL_MODIFICATION_MESSAGE = "Cannot modify read only List";

    /**
     * 
     */
    public ReadOnlyList(List target) {
        super ();
        
        this.target = target;
    }

    /* (non-Javadoc)
     * @see java.util.Collection#size()
     */
    public int size() {
        return target.size();
    }

    /* (non-Javadoc)
     * @see java.util.Collection#clear()
     */
    public void clear() {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#isEmpty()
     */
    public boolean isEmpty() {
        return target.isEmpty();
    }

    /* (non-Javadoc)
     * @see java.util.Collection#toArray()
     */
    public Object[] toArray() {
        return target.toArray();
    }

    /* (non-Javadoc)
     * @see java.util.List#get(int)
     */
    public Object get(int index) {
        return target.get(index);
    }

    /* (non-Javadoc)
     * @see java.util.List#remove(int)
     */
    public Object remove(int index) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.List#add(int, java.lang.Object)
     */
    public void add(int index, Object element) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.List#indexOf(java.lang.Object)
     */
    public int indexOf(Object o) {
        return target.indexOf(o);
    }

    /* (non-Javadoc)
     * @see java.util.List#lastIndexOf(java.lang.Object)
     */
    public int lastIndexOf(Object o) {
        return target.lastIndexOf(o);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#add(java.lang.Object)
     */
    public boolean add(Object o) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#contains(java.lang.Object)
     */
    public boolean contains(Object o) {
        return target.contains(o);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#remove(java.lang.Object)
     */
    public boolean remove(Object o) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.List#addAll(int, java.util.Collection)
     */
    public boolean addAll(int index, Collection c) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#addAll(java.util.Collection)
     */
    public boolean addAll(Collection c) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#containsAll(java.util.Collection)
     */
    public boolean containsAll(Collection c) {
        return target.containsAll(c);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#removeAll(java.util.Collection)
     */
    public boolean removeAll(Collection c) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#retainAll(java.util.Collection)
     */
    public boolean retainAll(Collection c) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#iterator()
     */
    public Iterator iterator() {
        return target.iterator();
    }

    /* (non-Javadoc)
     * @see java.util.List#subList(int, int)
     */
    public List subList(int fromIndex, int toIndex) {
        return target.subList(fromIndex, toIndex);
    }

    /* (non-Javadoc)
     * @see java.util.List#listIterator()
     */
    public ListIterator listIterator() {
        return target.listIterator();
    }

    /* (non-Javadoc)
     * @see java.util.List#listIterator(int)
     */
    public ListIterator listIterator(int index) {
        return target.listIterator(index);
    }

    /* (non-Javadoc)
     * @see java.util.List#set(int, java.lang.Object)
     */
    public Object set(int index, Object element) {
        throw new UnsupportedOperationException(ILLEGAL_MODIFICATION_MESSAGE);
    }

    /* (non-Javadoc)
     * @see java.util.Collection#toArray(java.lang.Object[])
     */
    public Object[] toArray(Object[] a) {
        return target.toArray(a);
    }
    

}