/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. 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.apache.commons.collections4.map; |
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import java.util.Iterator; |
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import java.util.Map; |
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import java.util.Set; |
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import org.apache.commons.collections4.MapIterator; |
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import org.apache.commons.collections4.ResettableIterator; |
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/** |
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* Adapts a Map entrySet to the MapIterator interface. |
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* |
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* @param <K> the type of the keys in the map |
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* @param <V> the type of the values in the map |
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* |
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* @since 4.0 |
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*/ |
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public class EntrySetToMapIteratorAdapter<K, V> implements MapIterator<K, V>, ResettableIterator<K> { |
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/** The adapted Map entry Set. */ |
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Set<Map.Entry<K, V>> entrySet; |
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/** The resettable iterator in use. */ |
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transient Iterator<Map.Entry<K, V>> iterator; |
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/** The currently positioned Map entry. */ |
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transient Map.Entry<K, V> entry; |
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/** |
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* Create a new EntrySetToMapIteratorAdapter. |
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* @param entrySet the entrySet to adapt |
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*/ |
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public EntrySetToMapIteratorAdapter(final Set<Map.Entry<K, V>> entrySet) { |
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this.entrySet = entrySet; |
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reset(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public K getKey() { |
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return current().getKey(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public V getValue() { |
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return current().getValue(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public V setValue(final V value) { |
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return current().setValue(value); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public boolean hasNext() { |
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return iterator.hasNext(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public K next() { |
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entry = iterator.next(); |
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return getKey(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public synchronized void reset() { |
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iterator = entrySet.iterator(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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@Override |
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public void remove() { |
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iterator.remove(); |
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entry = null; |
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} |
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/** |
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* Get the currently active entry. |
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* @return Map.Entry<K, V> |
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*/ |
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protected synchronized Map.Entry<K, V> current() { |
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if (entry == null) { |
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throw new IllegalStateException(); |
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} |
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return entry; |
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} |
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} |