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+// 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);
+
+}