commons-collections4-4.4-sources.jar - Apache Commons Collections
commons-collections4-4.4-sources.jar is the source JAR file for Apache Commons Collections 4.2, which
provides additional collection handling functionalities on top of JDK library.
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JAR name: commons-collections4-4.4-sources.jar Target JDK version: 8 Dependency: None File size: 715,541 bytes Release date: 05-Jul-2019 Download: Apache Commons Collections
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⏎ org/apache/commons/collections4/bidimap/DualTreeBidiMap.java
/*
* 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.bidimap;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.commons.collections4.BidiMap;
import org.apache.commons.collections4.OrderedBidiMap;
import org.apache.commons.collections4.OrderedMap;
import org.apache.commons.collections4.OrderedMapIterator;
import org.apache.commons.collections4.ResettableIterator;
import org.apache.commons.collections4.SortedBidiMap;
import org.apache.commons.collections4.map.AbstractSortedMapDecorator;
/**
* Implementation of {@link BidiMap} that uses two {@link TreeMap} instances.
* <p>
* The setValue() method on iterators will succeed only if the new value being set is
* not already in the bidimap.
* </p>
* <p>
* When considering whether to use this class, the {@link TreeBidiMap} class should
* also be considered. It implements the interface using a dedicated design, and does
* not store each object twice, which can save on memory use.
* </p>
* <p>
* NOTE: From Commons Collections 3.1, all subclasses will use {@link TreeMap}
* and the flawed <code>createMap</code> method is ignored.
* </p>
*
* @param <K> the type of the keys in this map
* @param <V> the type of the values in this map
* @since 3.0
*/
public class DualTreeBidiMap<K, V> extends AbstractDualBidiMap<K, V>
implements SortedBidiMap<K, V>, Serializable {
/** Ensure serialization compatibility */
private static final long serialVersionUID = 721969328361809L;
/** The key comparator to use */
private final Comparator<? super K> comparator;
/** The value comparator to use */
private final Comparator<? super V> valueComparator;
/**
* Creates an empty <code>DualTreeBidiMap</code>
*/
public DualTreeBidiMap() {
super(new TreeMap<K, V>(), new TreeMap<V, K>());
this.comparator = null;
this.valueComparator = null;
}
/**
* Constructs a <code>DualTreeBidiMap</code> and copies the mappings from
* specified <code>Map</code>.
*
* @param map the map whose mappings are to be placed in this map
*/
public DualTreeBidiMap(final Map<? extends K, ? extends V> map) {
super(new TreeMap<K, V>(), new TreeMap<V, K>());
putAll(map);
this.comparator = null;
this.valueComparator = null;
}
/**
* Constructs a {@link DualTreeBidiMap} using the specified {@link Comparator}.
*
* @param keyComparator the comparator
* @param valueComparator the values comparator to use
*/
public DualTreeBidiMap(final Comparator<? super K> keyComparator, final Comparator<? super V> valueComparator) {
super(new TreeMap<K, V>(keyComparator), new TreeMap<V, K>(valueComparator));
this.comparator = keyComparator;
this.valueComparator = valueComparator;
}
/**
* Constructs a {@link DualTreeBidiMap} that decorates the specified maps.
*
* @param normalMap the normal direction map
* @param reverseMap the reverse direction map
* @param inverseBidiMap the inverse BidiMap
*/
protected DualTreeBidiMap(final Map<K, V> normalMap, final Map<V, K> reverseMap,
final BidiMap<V, K> inverseBidiMap) {
super(normalMap, reverseMap, inverseBidiMap);
this.comparator = ((SortedMap<K, V>) normalMap).comparator();
this.valueComparator = ((SortedMap<V, K>) reverseMap).comparator();
}
/**
* Creates a new instance of this object.
*
* @param normalMap the normal direction map
* @param reverseMap the reverse direction map
* @param inverseMap the inverse BidiMap
* @return new bidi map
*/
@Override
protected DualTreeBidiMap<V, K> createBidiMap(final Map<V, K> normalMap, final Map<K, V> reverseMap,
final BidiMap<K, V> inverseMap) {
return new DualTreeBidiMap<>(normalMap, reverseMap, inverseMap);
}
//-----------------------------------------------------------------------
@Override
public Comparator<? super K> comparator() {
return ((SortedMap<K, V>) normalMap).comparator();
}
@Override
public Comparator<? super V> valueComparator() {
return ((SortedMap<V, K>) reverseMap).comparator();
}
@Override
public K firstKey() {
return ((SortedMap<K, V>) normalMap).firstKey();
}
@Override
public K lastKey() {
return ((SortedMap<K, V>) normalMap).lastKey();
}
@Override
public K nextKey(final K key) {
if (isEmpty()) {
return null;
}
if (normalMap instanceof OrderedMap) {
return ((OrderedMap<K, ?>) normalMap).nextKey(key);
}
final SortedMap<K, V> sm = (SortedMap<K, V>) normalMap;
final Iterator<K> it = sm.tailMap(key).keySet().iterator();
it.next();
if (it.hasNext()) {
return it.next();
}
return null;
}
@Override
public K previousKey(final K key) {
if (isEmpty()) {
return null;
}
if (normalMap instanceof OrderedMap) {
return ((OrderedMap<K, V>) normalMap).previousKey(key);
}
final SortedMap<K, V> sm = (SortedMap<K, V>) normalMap;
final SortedMap<K, V> hm = sm.headMap(key);
if (hm.isEmpty()) {
return null;
}
return hm.lastKey();
}
//-----------------------------------------------------------------------
/**
* Obtains an ordered map iterator.
* <p>
* This implementation copies the elements to an ArrayList in order to
* provide the forward/backward behaviour.
*
* @return a new ordered map iterator
*/
@Override
public OrderedMapIterator<K, V> mapIterator() {
return new BidiOrderedMapIterator<>(this);
}
public SortedBidiMap<V, K> inverseSortedBidiMap() {
return inverseBidiMap();
}
public OrderedBidiMap<V, K> inverseOrderedBidiMap() {
return inverseBidiMap();
}
//-----------------------------------------------------------------------
@Override
public SortedMap<K, V> headMap(final K toKey) {
final SortedMap<K, V> sub = ((SortedMap<K, V>) normalMap).headMap(toKey);
return new ViewMap<>(this, sub);
}
@Override
public SortedMap<K, V> tailMap(final K fromKey) {
final SortedMap<K, V> sub = ((SortedMap<K, V>) normalMap).tailMap(fromKey);
return new ViewMap<>(this, sub);
}
@Override
public SortedMap<K, V> subMap(final K fromKey, final K toKey) {
final SortedMap<K, V> sub = ((SortedMap<K, V>) normalMap).subMap(fromKey, toKey);
return new ViewMap<>(this, sub);
}
@Override
public SortedBidiMap<V, K> inverseBidiMap() {
return (SortedBidiMap<V, K>) super.inverseBidiMap();
}
//-----------------------------------------------------------------------
/**
* Internal sorted map view.
*/
protected static class ViewMap<K, V> extends AbstractSortedMapDecorator<K, V> {
/**
* Constructor.
* @param bidi the parent bidi map
* @param sm the subMap sorted map
*/
protected ViewMap(final DualTreeBidiMap<K, V> bidi, final SortedMap<K, V> sm) {
// the implementation is not great here...
// use the normalMap as the filtered map, but reverseMap as the full map
// this forces containsValue and clear to be overridden
super(new DualTreeBidiMap<>(sm, bidi.reverseMap, bidi.inverseBidiMap));
}
@Override
public boolean containsValue(final Object value) {
// override as default implementation uses reverseMap
return decorated().normalMap.containsValue(value);
}
@Override
public void clear() {
// override as default implementation uses reverseMap
for (final Iterator<K> it = keySet().iterator(); it.hasNext();) {
it.next();
it.remove();
}
}
@Override
public SortedMap<K, V> headMap(final K toKey) {
return new ViewMap<>(decorated(), super.headMap(toKey));
}
@Override
public SortedMap<K, V> tailMap(final K fromKey) {
return new ViewMap<>(decorated(), super.tailMap(fromKey));
}
@Override
public SortedMap<K, V> subMap(final K fromKey, final K toKey) {
return new ViewMap<>(decorated(), super.subMap(fromKey, toKey));
}
@Override
protected DualTreeBidiMap<K, V> decorated() {
return (DualTreeBidiMap<K, V>) super.decorated();
}
@Override
public K previousKey(final K key) {
return decorated().previousKey(key);
}
@Override
public K nextKey(final K key) {
return decorated().nextKey(key);
}
}
//-----------------------------------------------------------------------
/**
* Inner class MapIterator.
*/
protected static class BidiOrderedMapIterator<K, V> implements OrderedMapIterator<K, V>, ResettableIterator<K> {
/** The parent map */
private final AbstractDualBidiMap<K, V> parent;
/** The iterator being decorated */
private ListIterator<Map.Entry<K, V>> iterator;
/** The last returned entry */
private Map.Entry<K, V> last = null;
/**
* Constructor.
* @param parent the parent map
*/
protected BidiOrderedMapIterator(final AbstractDualBidiMap<K, V> parent) {
super();
this.parent = parent;
iterator = new ArrayList<>(parent.entrySet()).listIterator();
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public K next() {
last = iterator.next();
return last.getKey();
}
@Override
public boolean hasPrevious() {
return iterator.hasPrevious();
}
@Override
public K previous() {
last = iterator.previous();
return last.getKey();
}
@Override
public void remove() {
iterator.remove();
parent.remove(last.getKey());
last = null;
}
@Override
public K getKey() {
if (last == null) {
throw new IllegalStateException(
"Iterator getKey() can only be called after next() and before remove()");
}
return last.getKey();
}
@Override
public V getValue() {
if (last == null) {
throw new IllegalStateException(
"Iterator getValue() can only be called after next() and before remove()");
}
return last.getValue();
}
@Override
public V setValue(final V value) {
if (last == null) {
throw new IllegalStateException(
"Iterator setValue() can only be called after next() and before remove()");
}
if (parent.reverseMap.containsKey(value) &&
parent.reverseMap.get(value) != last.getKey()) {
throw new IllegalArgumentException(
"Cannot use setValue() when the object being set is already in the map");
}
final V oldValue = parent.put(last.getKey(), value);
// Map.Entry specifies that the behavior is undefined when the backing map
// has been modified (as we did with the put), so we also set the value
last.setValue(value);
return oldValue;
}
@Override
public void reset() {
iterator = new ArrayList<>(parent.entrySet()).listIterator();
last = null;
}
@Override
public String toString() {
if (last != null) {
return "MapIterator[" + getKey() + "=" + getValue() + "]";
}
return "MapIterator[]";
}
}
// Serialization
//-----------------------------------------------------------------------
private void writeObject(final ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
out.writeObject(normalMap);
}
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
normalMap = new TreeMap<>(comparator);
reverseMap = new TreeMap<>(valueComparator);
@SuppressWarnings("unchecked") // will fail at runtime if the stream is incorrect
final Map<K, V> map = (Map<K, V>) in.readObject();
putAll(map);
}
}
⏎ org/apache/commons/collections4/bidimap/DualTreeBidiMap.java
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