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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.collections;
import java.util.Iterator;
/**
* Defines an iterator that operates over a Map.
*
* 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.
*
* 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.
*
* In use, this iterator iterates through the keys in the map. After each call
* to next(), the getValue() method provides direct
* access to the value. The value can also be set using setValue().
*
* MapIterator it = map.mapIterator();
* while (it.hasNext()) {
* Object key = it.next();
* Object value = it.getValue();
* it.setValue(newValue);
* }
*
*
* @since Commons Collections 3.0
* @version $Revision$ $Date$
*
* @author Stephen Colebourne
*
* @deprecated Apache Commons Collections version 3.x is being deprecated from AEMaaCS. The upgraded version 4.4 of Commons Collections is already included as replacement. Customers are advised to upgrade to this version of the library. Please note: the package name was changed to org.apache.commons.collections4. Further note that there are AEM APIs currently exposing the old collections classes; these will be updated in upcoming releases.
*/
@Deprecated(since = "2021-04-30")
public interface MapIterator extends Iterator {
/**
* Checks to see if there are more entries still to be iterated.
*
* @return true if the iterator has more elements
*/
boolean hasNext();
/**
* Gets the next key from the Map.
*
* @return the next key in the iteration
* @throws java.util.NoSuchElementException if the iteration is finished
*/
Object next();
// -----------------------------------------------------------------------
/**
* Gets the current key, which is the key returned by the last call
* to next().
*
* @return the current key
* @throws IllegalStateException if next() has not yet been called
*/
Object getKey();
/**
* Gets the current value, which is the value associated with the last key
* returned by next().
*
* @return the current value
* @throws IllegalStateException if next() has not yet been called
*/
Object getValue();
// -----------------------------------------------------------------------
/**
* Removes the last returned key from the underlying Map (optional operation).
*
* This method can be called once per call to next().
*
* @throws UnsupportedOperationException if remove is not supported by the map
* @throws IllegalStateException if next() has not yet been called
* @throws IllegalStateException if remove() has already been called
* since the last call to next()
*/
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 next() has not yet been called
* @throws IllegalStateException if remove() has been called since the
* last call to next()
*/
Object setValue(Object value);
}