2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0.
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 package gov.nasa.jpf.util;
20 import java.util.Iterator;
21 import java.util.NoSuchElementException;
24 * utility class for JPF internal linked lists that are tail-immutable
26 public class ImmutableList<E> implements Iterable<E> {
28 static class IteratorImpl<E> implements Iterator<E> {
30 private ImmutableList<E> next;
32 private IteratorImpl(ImmutableList<E> list){
37 public boolean hasNext() {
38 return (next != null);
49 throw new NoSuchElementException();
54 public void remove() {
55 throw new UnsupportedOperationException("can't remove elements from ImmutableList");
61 public final ImmutableList<E> tail;
64 public ImmutableList(E data, ImmutableList<E> tail) {
70 public Iterator<E> iterator() {
71 return new IteratorImpl(this);
74 public boolean contains (E object){
76 if (e.equals(object)){