| /* |
| * 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.buffer; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import org.apache.commons.collections.Buffer; |
| import org.apache.commons.collections.Unmodifiable; |
| import org.apache.commons.collections.iterators.UnmodifiableIterator; |
| |
| /** |
| * Decorates another <code>Buffer</code> to ensure it can't be altered. |
| * <p> |
| * This class is Serializable from Commons Collections 3.1. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:32 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public final class UnmodifiableBuffer |
| extends AbstractBufferDecorator |
| implements Unmodifiable, Serializable { |
| |
| /** Serialization version */ |
| private static final long serialVersionUID = 1832948656215393357L; |
| |
| /** |
| * Factory method to create an unmodifiable buffer. |
| * <p> |
| * If the buffer passed in is already unmodifiable, it is returned. |
| * |
| * @param buffer the buffer to decorate, must not be null |
| * @return an unmodifiable Buffer |
| * @throws IllegalArgumentException if buffer is null |
| */ |
| public static Buffer decorate(Buffer buffer) { |
| if (buffer instanceof Unmodifiable) { |
| return buffer; |
| } |
| return new UnmodifiableBuffer(buffer); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Constructor that wraps (not copies). |
| * |
| * @param buffer the buffer to decorate, must not be null |
| * @throws IllegalArgumentException if buffer is null |
| */ |
| private UnmodifiableBuffer(Buffer buffer) { |
| super(buffer); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Write the collection out using a custom routine. |
| * |
| * @param out the output stream |
| * @throws IOException |
| */ |
| private void writeObject(ObjectOutputStream out) throws IOException { |
| out.defaultWriteObject(); |
| out.writeObject(collection); |
| } |
| |
| /** |
| * Read the collection in using a custom routine. |
| * |
| * @param in the input stream |
| * @throws IOException |
| * @throws ClassNotFoundException |
| */ |
| private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { |
| in.defaultReadObject(); |
| collection = (Collection) in.readObject(); |
| } |
| |
| //----------------------------------------------------------------------- |
| 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 Object remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| } |