diff --git a/platform/util-rt/src/com/intellij/util/containers/EmptyListIterator.java b/platform/util-rt/src/com/intellij/util/containers/EmptyListIterator.java new file mode 100644 index 000000000000..eef4c811d48c --- /dev/null +++ b/platform/util-rt/src/com/intellij/util/containers/EmptyListIterator.java @@ -0,0 +1,58 @@ +/* + * Copyright 2000-2012 JetBrains s.r.o. + * + * 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 com.intellij.util.containers; + +import java.util.ListIterator; +import java.util.NoSuchElementException; + +public class EmptyListIterator extends EmptyIterator implements ListIterator { + private static final EmptyListIterator INSTANCE = new EmptyListIterator(); + + public static EmptyListIterator getInstance() { + //noinspection unchecked + return (EmptyListIterator)INSTANCE; + } + + @Override + public boolean hasPrevious() { + return false; + } + + @Override + public E previous() { + throw new NoSuchElementException(); + } + + @Override + public int nextIndex() { + return 0; + } + + @Override + public int previousIndex() { + return -1; + } + + @Override + public void set(E e) { + throw new IllegalStateException(); + } + + @Override + public void add(E e) { + throw new UnsupportedOperationException(); + } +}