mirror of
https://codeberg.org/Mercury-IM/Smack
synced 2024-08-25 10:20:27 +02:00
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@6213 b35dd754-fafc-0310-a699-88a17e54d16e
110 lines
4 KiB
Java
110 lines
4 KiB
Java
// GenericsNote: Converted.
|
|
/*
|
|
* 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.jivesoftware.smack.util.collections;
|
|
|
|
import java.util.Iterator;
|
|
|
|
/**
|
|
* Defines an iterator that operates over a <code>Map</code>.
|
|
* <p/>
|
|
* This iterator is a special version designed for maps. It can be more
|
|
* efficient to use this rather than an entry set iterator where the option
|
|
* is available, and it is certainly more convenient.
|
|
* <p/>
|
|
* A map that provides this interface may not hold the data internally using
|
|
* Map Entry objects, thus this interface can avoid lots of object creation.
|
|
* <p/>
|
|
* In use, this iterator iterates through the keys in the map. After each call
|
|
* to <code>next()</code>, the <code>getValue()</code> method provides direct
|
|
* access to the value. The value can also be set using <code>setValue()</code>.
|
|
* <pre>
|
|
* MapIterator it = map.mapIterator();
|
|
* while (it.hasNext()) {
|
|
* Object key = it.next();
|
|
* Object value = it.getValue();
|
|
* it.setValue(newValue);
|
|
* }
|
|
* </pre>
|
|
*
|
|
* @author Matt Hall, John Watkinson, Stephen Colebourne
|
|
* @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:19 $
|
|
* @since Commons Collections 3.0
|
|
*/
|
|
public interface MapIterator <K,V> extends Iterator<K> {
|
|
|
|
/**
|
|
* Checks to see if there are more entries still to be iterated.
|
|
*
|
|
* @return <code>true</code> if the iterator has more elements
|
|
*/
|
|
boolean hasNext();
|
|
|
|
/**
|
|
* Gets the next <em>key</em> from the <code>Map</code>.
|
|
*
|
|
* @return the next key in the iteration
|
|
* @throws java.util.NoSuchElementException
|
|
* if the iteration is finished
|
|
*/
|
|
K next();
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Gets the current key, which is the key returned by the last call
|
|
* to <code>next()</code>.
|
|
*
|
|
* @return the current key
|
|
* @throws IllegalStateException if <code>next()</code> has not yet been called
|
|
*/
|
|
K getKey();
|
|
|
|
/**
|
|
* Gets the current value, which is the value associated with the last key
|
|
* returned by <code>next()</code>.
|
|
*
|
|
* @return the current value
|
|
* @throws IllegalStateException if <code>next()</code> has not yet been called
|
|
*/
|
|
V getValue();
|
|
|
|
//-----------------------------------------------------------------------
|
|
/**
|
|
* Removes the last returned key from the underlying <code>Map</code> (optional operation).
|
|
* <p/>
|
|
* This method can be called once per call to <code>next()</code>.
|
|
*
|
|
* @throws UnsupportedOperationException if remove is not supported by the map
|
|
* @throws IllegalStateException if <code>next()</code> has not yet been called
|
|
* @throws IllegalStateException if <code>remove()</code> has already been called
|
|
* since the last call to <code>next()</code>
|
|
*/
|
|
void remove();
|
|
|
|
/**
|
|
* Sets the value associated with the current key (optional operation).
|
|
*
|
|
* @param value the new value
|
|
* @return the previous value
|
|
* @throws UnsupportedOperationException if setValue is not supported by the map
|
|
* @throws IllegalStateException if <code>next()</code> has not yet been called
|
|
* @throws IllegalStateException if <code>remove()</code> has been called since the
|
|
* last call to <code>next()</code>
|
|
*/
|
|
V setValue(V value);
|
|
|
|
}
|