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109 lines
4 KiB
Java
109 lines
4 KiB
Java
// GenericsNote: Converted.
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/*
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* Copyright 2003-2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util.collections;
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import java.util.Iterator;
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/**
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* Defines an iterator that operates over a <code>Map</code>.
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* <p/>
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* This iterator is a special version designed for maps. It can be more
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* efficient to use this rather than an entry set iterator where the option
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* is available, and it is certainly more convenient.
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* <p/>
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* A map that provides this interface may not hold the data internally using
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* Map Entry objects, thus this interface can avoid lots of object creation.
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* <p/>
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* In use, this iterator iterates through the keys in the map. After each call
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* to <code>next()</code>, the <code>getValue()</code> method provides direct
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* access to the value. The value can also be set using <code>setValue()</code>.
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* <pre>
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* MapIterator it = map.mapIterator();
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* while (it.hasNext()) {
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* Object key = it.next();
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* Object value = it.getValue();
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* it.setValue(newValue);
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* }
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* </pre>
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*
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* @author Matt Hall, John Watkinson, Stephen Colebourne
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* @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:19 $
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* @since Commons Collections 3.0
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*/
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public interface MapIterator <K,V> extends Iterator<K> {
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/**
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* Checks to see if there are more entries still to be iterated.
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*
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* @return <code>true</code> if the iterator has more elements
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*/
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boolean hasNext();
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/**
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* Gets the next <em>key</em> from the <code>Map</code>.
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*
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* @return the next key in the iteration
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* @throws java.util.NoSuchElementException
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* if the iteration is finished
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*/
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K next();
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//-----------------------------------------------------------------------
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/**
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* Gets the current key, which is the key returned by the last call
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* to <code>next()</code>.
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*
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* @return the current key
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* @throws IllegalStateException if <code>next()</code> has not yet been called
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*/
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K getKey();
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/**
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* Gets the current value, which is the value associated with the last key
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* returned by <code>next()</code>.
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*
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* @return the current value
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* @throws IllegalStateException if <code>next()</code> has not yet been called
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*/
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V getValue();
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//-----------------------------------------------------------------------
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/**
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* Removes the last returned key from the underlying <code>Map</code> (optional operation).
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* <p/>
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* This method can be called once per call to <code>next()</code>.
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*
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* @throws UnsupportedOperationException if remove is not supported by the map
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* @throws IllegalStateException if <code>next()</code> has not yet been called
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* @throws IllegalStateException if <code>remove()</code> has already been called
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* since the last call to <code>next()</code>
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*/
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void remove();
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/**
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* Sets the value associated with the current key (optional operation).
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*
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* @param value the new value
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* @return the previous value
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* @throws UnsupportedOperationException if setValue is not supported by the map
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* @throws IllegalStateException if <code>next()</code> has not yet been called
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* @throws IllegalStateException if <code>remove()</code> has been called since the
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* last call to <code>next()</code>
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*/
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V setValue(V value);
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}
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