it.unimi.dsi.fastutil.shorts.Short2ReferenceMaps Maven / Gradle / Ivy
/*
* Copyright (C) 2002-2017 Sebastiano Vigna
*
* 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 it.unimi.dsi.fastutil.shorts;
import it.unimi.dsi.fastutil.objects.ObjectSet;
import it.unimi.dsi.fastutil.objects.ObjectSets;
import it.unimi.dsi.fastutil.objects.ReferenceCollection;
import it.unimi.dsi.fastutil.objects.ReferenceCollections;
import it.unimi.dsi.fastutil.objects.ReferenceSets;
import java.util.Map;
/** A class providing static methods and objects that do useful things with type-specific maps.
*
* @see it.unimi.dsi.fastutil.Maps
* @see java.util.Collections
*/
public class Short2ReferenceMaps {
private Short2ReferenceMaps() {}
/** An immutable class representing an empty type-specific map.
*
* This class may be useful to implement your own in case you subclass
* a type-specific map.
*/
public static class EmptyMap extends Short2ReferenceFunctions.EmptyFunction implements Short2ReferenceMap , java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected EmptyMap() {}
@Override
public boolean containsValue(final Object v) { return false; }
@Override
public void putAll(final Map m) { throw new UnsupportedOperationException(); }
@SuppressWarnings("unchecked")
@Override
public ObjectSet > short2ReferenceEntrySet() { return ObjectSets.EMPTY_SET; }
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public ObjectSet> entrySet() { return (ObjectSet)short2ReferenceEntrySet(); }
@Override
public ShortSet keySet() { return ShortSets.EMPTY_SET; }
@SuppressWarnings("unchecked")
@Override
public ReferenceCollection values() { return ReferenceSets.EMPTY_SET; }
private Object readResolve() { return EMPTY_MAP; }
@Override
public Object clone() { return EMPTY_MAP; }
@Override
public boolean isEmpty() { return true; }
@Override
public int hashCode() { return 0; }
@Override
public boolean equals(final Object o) {
if (! (o instanceof Map)) return false;
return ((Map)o).isEmpty();
}
@Override
public String toString() { return "{}"; }
}
/** An empty type-specific map (immutable). It is serializable and cloneable.
*/
@SuppressWarnings("rawtypes")
public static final EmptyMap EMPTY_MAP = new EmptyMap();
/** Returns an empty map (immutable). It is serializable and cloneable.
*
* This method provides a typesafe access to {@link #EMPTY_MAP}.
* @return an empty map (immutable).
*/
@SuppressWarnings("unchecked")
public static Short2ReferenceMap emptyMap() {
return EMPTY_MAP;
}
/** An immutable class representing a type-specific singleton map.
*
* This class may be useful to implement your own in case you subclass
* a type-specific map.
*/
public static class Singleton extends Short2ReferenceFunctions.Singleton implements Short2ReferenceMap , java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected transient ObjectSet > entries;
protected transient ShortSet keys;
protected transient ReferenceCollection values;
protected Singleton(final short key, final V value) {
super(key, value);
}
@Override
public boolean containsValue(final Object v) { return ( (value) == (v) ); }
@Override
public void putAll(final Map m) { throw new UnsupportedOperationException(); }
@Override
public ObjectSet > short2ReferenceEntrySet() { if (entries == null) entries = ObjectSets.singleton((Short2ReferenceMap.Entry )new AbstractShort2ReferenceMap.BasicEntry (key, value)); return entries; }
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public ObjectSet> entrySet() { return (ObjectSet)short2ReferenceEntrySet(); }
@Override
public ShortSet keySet() { if (keys == null) keys = ShortSets.singleton(key); return keys; }
@Override
public ReferenceCollection values() { if (values == null) values = ReferenceSets.singleton(value); return values; }
@Override
public boolean isEmpty() { return false; }
@Override
public int hashCode() { return (key) ^ ( (value) == null ? 0 : System.identityHashCode(value) ); }
@Override
public boolean equals(final Object o) {
if (o == this) return true;
if (! (o instanceof Map)) return false;
Map m = (Map)o;
if (m.size() != 1) return false;
return m.entrySet().iterator().next().equals(entrySet().iterator().next());
}
@Override
public String toString() { return "{" + key + "=>" + value + "}"; }
}
/** Returns a type-specific immutable map containing only the specified pair. The returned map is serializable and cloneable.
*
* Note that albeit the returned map is immutable, its default return value may be changed.
*
* @param key the only key of the returned map.
* @param value the only value of the returned map.
* @return a type-specific immutable map containing just the pair <key,value>.
*/
public static Short2ReferenceMap singleton(final short key, V value) {
return new Singleton (key, value);
}
/** Returns a type-specific immutable map containing only the specified pair. The returned map is serializable and cloneable.
*
* Note that albeit the returned map is immutable, its default return value may be changed.
*
* @param key the only key of the returned map.
* @param value the only value of the returned map.
* @return a type-specific immutable map containing just the pair <key,value>.
*/
public static Short2ReferenceMap singleton(final Short key, final V value) {
return new Singleton (((key).shortValue()), (value));
}
/** A synchronized wrapper class for maps. */
public static class SynchronizedMap extends Short2ReferenceFunctions.SynchronizedFunction implements Short2ReferenceMap , java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final Short2ReferenceMap map;
protected transient ObjectSet > entries;
protected transient ShortSet keys;
protected transient ReferenceCollection values;
protected SynchronizedMap(final Short2ReferenceMap m, final Object sync) {
super(m, sync);
this.map = m;
}
protected SynchronizedMap(final Short2ReferenceMap m) {
super(m);
this.map = m;
}
@Override
public boolean containsValue(final Object v) { synchronized(sync) { return map.containsValue(v); } }
@Override
public void putAll(final Map m) { synchronized(sync) { map.putAll(m); } }
@Override
public ObjectSet > short2ReferenceEntrySet() {
synchronized(sync) { if (entries == null) entries = ObjectSets.synchronize(map.short2ReferenceEntrySet(), sync); return entries; }
}
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public ObjectSet> entrySet() { return (ObjectSet)short2ReferenceEntrySet(); }
@Override
public ShortSet keySet() {
synchronized(sync) { if (keys == null) keys = ShortSets.synchronize(map.keySet(), sync); return keys; }
}
@Override
public ReferenceCollection values() {
synchronized(sync) { if (values == null) return ReferenceCollections.synchronize(map.values(), sync); return values; }
}
@Override
public boolean isEmpty() { synchronized(sync) { return map.isEmpty(); } }
@Override
public int hashCode() { synchronized(sync) { return map.hashCode(); } }
@Override
public boolean equals(final Object o) { if (o == this) return true; synchronized(sync) { return map.equals(o); } }
private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
synchronized(sync) { s.defaultWriteObject(); }
}
}
/** Returns a synchronized type-specific map backed by the given type-specific map.
*
* @param m the map to be wrapped in a synchronized map.
* @return a synchronized view of the specified map.
* @see java.util.Collections#synchronizedMap(Map)
*/
public static Short2ReferenceMap synchronize(final Short2ReferenceMap m) { return new SynchronizedMap (m); }
/** Returns a synchronized type-specific map backed by the given type-specific map, using an assigned object to synchronize.
*
* @param m the map to be wrapped in a synchronized map.
* @param sync an object that will be used to synchronize the access to the map.
* @return a synchronized view of the specified map.
* @see java.util.Collections#synchronizedMap(Map)
*/
public static Short2ReferenceMap synchronize(final Short2ReferenceMap m, final Object sync) { return new SynchronizedMap (m, sync); }
/** An unmodifiable wrapper class for maps. */
public static class UnmodifiableMap extends Short2ReferenceFunctions.UnmodifiableFunction implements Short2ReferenceMap , java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final Short2ReferenceMap map;
protected transient ObjectSet > entries;
protected transient ShortSet keys;
protected transient ReferenceCollection values;
protected UnmodifiableMap(final Short2ReferenceMap m) {
super(m);
this.map = m;
}
@Override
public boolean containsValue(final Object v) { return map.containsValue(v); }
@Override
public boolean isEmpty() { return map.isEmpty(); }
@Override
public void putAll(final Map m) { throw new UnsupportedOperationException(); }
@Override
public ObjectSet > short2ReferenceEntrySet() { if (entries == null) entries = ObjectSets.unmodifiable(map.short2ReferenceEntrySet()); return entries; }
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public ObjectSet> entrySet() { return (ObjectSet)short2ReferenceEntrySet(); }
@Override
public ShortSet keySet() { if (keys == null) keys = ShortSets.unmodifiable(map.keySet()); return keys; }
@Override
public ReferenceCollection values() { if (values == null) return ReferenceCollections.unmodifiable(map.values()); return values; }
}
/** Returns an unmodifiable type-specific map backed by the given type-specific map.
*
* @param m the map to be wrapped in an unmodifiable map.
* @return an unmodifiable view of the specified map.
* @see java.util.Collections#unmodifiableMap(Map)
*/
public static Short2ReferenceMap unmodifiable(final Short2ReferenceMap m) { return new UnmodifiableMap (m); }
}