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406 lines
10 KiB
Java
406 lines
10 KiB
Java
/* EnumMap.java - Map where keys are enum constants
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Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util;
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import java.io.Serializable;
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/**
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* @author Tom Tromey (tromey@redhat.com)
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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public class EnumMap<K extends Enum<K>, V>
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extends AbstractMap<K, V>
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implements Cloneable, Serializable
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{
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private static final long serialVersionUID = 458661240069192865L;
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V[] store;
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int cardinality;
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Class<K> enumClass;
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/**
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* The cache for {@link #entrySet()}.
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*/
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transient Set<Map.Entry<K, V>> entries;
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static final Object emptySlot = new Object();
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public EnumMap(Class<K> keyType)
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{
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store = (V[]) new Object[keyType.getEnumConstants().length];
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Arrays.fill(store, emptySlot);
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cardinality = 0;
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enumClass = keyType;
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}
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public EnumMap(EnumMap<K, ? extends V> map)
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{
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store = (V[]) map.store.clone();
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cardinality = map.cardinality;
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enumClass = map.enumClass;
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}
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public EnumMap(Map<K, ? extends V> map)
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{
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if (map instanceof EnumMap)
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{
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EnumMap<K, ? extends V> other = (EnumMap<K, ? extends V>) map;
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store = (V[]) other.store.clone();
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cardinality = other.cardinality;
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enumClass = other.enumClass;
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}
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else
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{
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for (K key : map.keySet())
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{
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V value = map.get(key);
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if (store == null)
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{
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enumClass = key.getDeclaringClass();
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store = (V[]) new Object[enumClass.getEnumConstants().length];
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}
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int o = key.ordinal();
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if (store[o] == emptySlot)
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++cardinality;
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store[o] = value;
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}
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// There must be a single element.
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if (store == null)
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throw new IllegalArgumentException("no elements in map");
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}
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}
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public int size()
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{
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return cardinality;
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}
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public boolean containsValue(Object value)
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{
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for (V i : store)
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{
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if (i != emptySlot && AbstractCollection.equals(i , value))
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return true;
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}
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return false;
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}
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public boolean containsKey(Object key)
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{
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if (! (key instanceof Enum))
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return false;
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Enum<K> e = (Enum<K>) key;
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if (e.getDeclaringClass() != enumClass)
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return false;
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return store[e.ordinal()] != emptySlot;
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}
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public V get(Object key)
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{
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if (! (key instanceof Enum))
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return null;
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Enum<K> e = (Enum<K>) key;
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if (e.getDeclaringClass() != enumClass)
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return null;
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V o = store[e.ordinal()];
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return o == emptySlot ? null : o;
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}
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public V put(K key, V value)
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{
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int o = key.ordinal();
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V result;
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if (store[o] == emptySlot)
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{
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result = null;
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++cardinality;
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}
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else
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result = store[o];
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store[o] = value;
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return result;
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}
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public V remove(Object key)
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{
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if (! (key instanceof Enum))
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return null;
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Enum<K> e = (Enum<K>) key;
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if (e.getDeclaringClass() != enumClass)
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return null;
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V result = store[e.ordinal()];
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if (result == emptySlot)
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result = null;
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else
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--cardinality;
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store[e.ordinal()] = (V) emptySlot;
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return result;
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}
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public void putAll(Map<? extends K, ? extends V> map)
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{
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for (K key : map.keySet())
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{
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V value = map.get(key);
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int o = key.ordinal();
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if (store[o] == emptySlot)
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++cardinality;
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store[o] = value;
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}
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}
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public void clear()
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{
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Arrays.fill(store, emptySlot);
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cardinality = 0;
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}
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public Set<K> keySet()
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{
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if (keys == null)
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{
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keys = new AbstractSet<K>()
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{
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public int size()
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{
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return cardinality;
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}
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public Iterator<K> iterator()
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{
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return new Iterator<K>()
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{
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int count = 0;
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int index = -1;
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public boolean hasNext()
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{
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return count < cardinality;
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}
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public K next()
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{
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++count;
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for (++index; store[index] == emptySlot; ++index)
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;
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return enumClass.getEnumConstants()[index];
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}
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public void remove()
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{
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--cardinality;
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store[index] = (V) emptySlot;
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}
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};
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}
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public void clear()
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{
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EnumMap.this.clear();
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}
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public boolean contains(Object o)
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{
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return contains(o);
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}
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public boolean remove(Object o)
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{
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return EnumMap.this.remove(o) != null;
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}
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};
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}
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return keys;
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}
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public Collection<V> values()
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{
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if (values == null)
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{
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values = new AbstractCollection<V>()
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{
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public int size()
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{
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return cardinality;
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}
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public Iterator<V> iterator()
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{
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return new Iterator<V>()
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{
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int count = 0;
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int index = -1;
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public boolean hasNext()
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{
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return count < cardinality;
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}
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public V next()
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{
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++count;
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for (++index; store[index] == emptySlot; ++index)
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;
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return store[index];
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}
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public void remove()
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{
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--cardinality;
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store[index] = (V) emptySlot;
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}
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};
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}
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public void clear()
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{
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EnumMap.this.clear();
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}
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};
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}
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return values;
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}
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public Set<Map.Entry<K, V>> entrySet()
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{
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if (entries == null)
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{
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entries = new AbstractSet<Map.Entry<K, V>>()
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{
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public int size()
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{
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return cardinality;
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}
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public Iterator<Map.Entry<K, V>> iterator()
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{
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return new Iterator<Map.Entry<K, V>>()
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{
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int count = 0;
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int index = -1;
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public boolean hasNext()
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{
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return count < cardinality;
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}
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public Map.Entry<K,V> next()
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{
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++count;
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for (++index; store[index] == emptySlot; ++index)
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;
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// FIXME: we could just return something that
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// only knows the index. That would be cleaner.
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return new AbstractMap.SimpleEntry<K, V>(enumClass.getEnumConstants()[index],
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store[index])
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{
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public V setValue(V newVal)
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{
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value = newVal;
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return put(key, newVal);
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}
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};
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}
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public void remove()
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{
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--cardinality;
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store[index] = (V) emptySlot;
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}
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};
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}
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public void clear()
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{
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EnumMap.this.clear();
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}
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public boolean contains(Object o)
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{
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if (! (o instanceof Map.Entry))
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return false;
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Map.Entry<K, V> other = (Map.Entry<K, V>) o;
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return (containsKey(other.getKey())
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&& AbstractCollection.equals(get(other.getKey()),
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other.getValue()));
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}
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public boolean remove(Object o)
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{
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if (! (o instanceof Map.Entry))
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return false;
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Map.Entry<K, V> other = (Map.Entry<K, V>) o;
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return EnumMap.this.remove(other.getKey()) != null;
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}
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};
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}
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return entries;
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}
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public boolean equals(Object o)
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{
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if (! (o instanceof EnumMap))
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return false;
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EnumMap<K, V> other = (EnumMap<K, V>) o;
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if (other.enumClass != enumClass || other.cardinality != cardinality)
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return false;
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return Arrays.equals(store, other.store);
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}
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public EnumMap<K, V> clone()
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{
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EnumMap<K, V> result;
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try
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{
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result = (EnumMap<K, V>) super.clone();
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}
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catch (CloneNotSupportedException ignore)
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{
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// Can't happen.
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result = null;
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}
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result.store = (V[]) store.clone();
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return result;
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}
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}
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