com.groupbyinc.common.apache.commons.collections4.map.EntrySetToMapIteratorAdapter Maven / Gradle / Ivy
/*
* 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.collections4.map;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.commons.collections4.MapIterator;
import org.apache.commons.collections4.ResettableIterator;
/**
* Adapts a Map entrySet to the MapIterator interface.
*
* @since 4.0
* @version $Id: EntrySetToMapIteratorAdapter.java 1494296 2013-06-18 20:54:29Z tn $
*/
public class EntrySetToMapIteratorAdapter implements MapIterator, ResettableIterator {
/** The adapted Map entry Set. */
Set> entrySet;
/** The resettable iterator in use. */
transient Iterator> iterator;
/** The currently positioned Map entry. */
transient Map.Entry entry;
/**
* Create a new EntrySetToMapIteratorAdapter.
* @param entrySet the entrySet to adapt
*/
public EntrySetToMapIteratorAdapter(final Set> entrySet) {
this.entrySet = entrySet;
reset();
}
/**
* {@inheritDoc}
*/
public K getKey() {
return current().getKey();
}
/**
* {@inheritDoc}
*/
public V getValue() {
return current().getValue();
}
/**
* {@inheritDoc}
*/
public V setValue(final V value) {
return current().setValue(value);
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return iterator.hasNext();
}
/**
* {@inheritDoc}
*/
public K next() {
entry = iterator.next();
return getKey();
}
/**
* {@inheritDoc}
*/
public synchronized void reset() {
iterator = entrySet.iterator();
}
/**
* {@inheritDoc}
*/
public void remove() {
iterator.remove();
entry = null;
}
/**
* Get the currently active entry.
* @return Map.Entry
*/
protected synchronized Map.Entry current() {
if (entry == null) {
throw new IllegalStateException();
}
return entry;
}
}