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A set of utilities and tools to speed up and ease programming in Java.

There is a newer version: 0.5

/*
 * (c) 2005 David B. Bracewell
 *
 * 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 com.davidbracewell.collection;

import com.google.common.collect.Iterators;

import java.util.Iterator;

/**
 * @author David B. Bracewell
 */
final class UnmodifiableIndex extends ForwardingIndex {

  private static final long serialVersionUID = -3044104679509123935L;
  private final Index backing;

  UnmodifiableIndex(Index backing) {
    this.backing = backing;
  }

  @Override
  public int add(TYPE item) {
    throw new UnsupportedOperationException("Cannot modify a read only index.");
  }

  @Override
  public void addAll(Iterable items) {
    throw new UnsupportedOperationException("Cannot modify a read only index.");
  }

  @Override
  public void clear() {
    throw new UnsupportedOperationException("Cannot modify a read only index.");
  }

  @Override
  protected Index delegate() {
    return backing;
  }

  @Override
  public Iterator iterator() {
    return Iterators.unmodifiableIterator(super.iterator());
  }

  @Override
  public int remove(TYPE item) {
    throw new UnsupportedOperationException("Cannot modify a read only index.");
  }

  @Override
  public TYPE remove(int id) {
    throw new UnsupportedOperationException("Cannot modify a read only index.");
  }

  @Override
  public TYPE set(int index, TYPE newValue) {
    throw new UnsupportedOperationException("Cannot modify a read only index.");
  }
}
//END OF UnmodifiableIndex