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Diffstat (limited to 'src/org/jivesoftware/smack/util/collections/AbstractEmptyIterator.java')
-rw-r--r-- | src/org/jivesoftware/smack/util/collections/AbstractEmptyIterator.java | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/org/jivesoftware/smack/util/collections/AbstractEmptyIterator.java b/src/org/jivesoftware/smack/util/collections/AbstractEmptyIterator.java new file mode 100644 index 0000000..c2ec156 --- /dev/null +++ b/src/org/jivesoftware/smack/util/collections/AbstractEmptyIterator.java @@ -0,0 +1,89 @@ +// GenericsNote: Converted. +/* + * Copyright 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.jivesoftware.smack.util.collections; + +import java.util.NoSuchElementException; + +/** + * Provides an implementation of an empty iterator. + * + * @author Matt Hall, John Watkinson, Stephen Colebourne + * @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $ + * @since Commons Collections 3.1 + */ +abstract class AbstractEmptyIterator <E> { + + /** + * Constructor. + */ + protected AbstractEmptyIterator() { + super(); + } + + public boolean hasNext() { + return false; + } + + public E next() { + throw new NoSuchElementException("Iterator contains no elements"); + } + + public boolean hasPrevious() { + return false; + } + + public E previous() { + throw new NoSuchElementException("Iterator contains no elements"); + } + + public int nextIndex() { + return 0; + } + + public int previousIndex() { + return -1; + } + + public void add(E obj) { + throw new UnsupportedOperationException("add() not supported for empty Iterator"); + } + + public void set(E obj) { + throw new IllegalStateException("Iterator contains no elements"); + } + + public void remove() { + throw new IllegalStateException("Iterator contains no elements"); + } + + public E getKey() { + throw new IllegalStateException("Iterator contains no elements"); + } + + public E getValue() { + throw new IllegalStateException("Iterator contains no elements"); + } + + public E setValue(E value) { + throw new IllegalStateException("Iterator contains no elements"); + } + + public void reset() { + // do nothing + } + +} |