/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*
* fastutil: Fast & compact type-specific collections for Java
*
* Copyright (C) 2002-2008 Sebastiano Vigna
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package it.unimi.dsi.fastutil.chars;
import it.unimi.dsi.fastutil.objects.ObjectCollection;
import it.unimi.dsi.fastutil.objects.AbstractObjectCollection;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import it.unimi.dsi.fastutil.objects.AbstractObjectIterator;
import it.unimi.dsi.fastutil.objects.ObjectSet;
import java.util.Iterator;
import java.util.Map;
/** An abstract class providing basic methods for maps implementing a type-specific interface.
*
* <P>Optional operations just throw an {@link
* UnsupportedOperationException}. Generic versions of accessors delegate to
* the corresponding type-specific counterparts following the interface rules
* (they take care of returning <code>null</code> on a missing key).
*
* <P>As a further help, this class provides a {@link BasicEntry BasicEntry} inner class
* that implements a type-specific version of {@link java.util.Map.Entry}; it
* is particularly useful for those classes that do not implement their own
* entries (e.g., most immutable maps).
*/
public abstract class AbstractChar2ObjectMap <V> extends AbstractChar2ObjectFunction <V> implements Char2ObjectMap <V>, java.io.Serializable {
public static final long serialVersionUID = -4940583368468432370L;
protected AbstractChar2ObjectMap() {}
/** Checks whether the given value is contained in {@link #values()}. */
public boolean containsValue( Object v ) {
return values().contains( v );
}
/** Checks whether the given value is contained in {@link #keySet()}. */
public boolean containsKey( char k ) {
return keySet().contains( k );
}
/** Puts all pairs in the given map.
* If the map implements the interface of this map,
* it uses the faster iterators.
*
* @param m a map.
*/
@SuppressWarnings("unchecked")
public void putAll(Map<? extends Character,? extends V> m) {
int n = m.size();
final Iterator<? extends Map.Entry<? extends Character,? extends V>> i = m.entrySet().iterator();
if (m instanceof Char2ObjectMap) {
Char2ObjectMap.Entry <? extends V> e;
while(n-- != 0) {
e = (Char2ObjectMap.Entry <? extends V>)i.next();
put(e.getCharKey(), e.getValue());
}
}
else {
Map.Entry<? extends Character,? extends V> e;
while(n-- != 0) {
e = i.next();
put(e.getKey(), e.getValue());
}
}
}
public boolean isEmpty() {
return size() == 0;
}
/** This class provides a basic but complete type-specific entry class for all those maps implementations
* that do not have entries on their own (e.g., most immutable maps).
*
* <P>This class does not implement {@link java.util.Map.Entry#setValue(Object) setValue()}, as the modification
* would not be reflected in the base map.
*/
public static class BasicEntry <V> implements Char2ObjectMap.Entry <V> {
protected char key;
protected V value;
public BasicEntry( final Character key, final V value ) {
this.key = ((key).charValue());
this.value = (value);
}
public BasicEntry( final char key, final V value ) {
this.key = key;
this.value = value;
}
public Character getKey() {
return (Character.valueOf(key));
}
public char getCharKey() {
return key;
}
public V getValue() {
return (value);
}
public V setValue( final V value ) {
throw new UnsupportedOperationException();
}
public boolean equals( final Object o ) {
if (!(o instanceof Map.Entry)) return false;
Map.Entry<?,?> e = (Map.Entry<?,?>)o;
return ( (key) == (((((Character)(e.getKey())).charValue()))) ) && ( (value) == null ? ((e.getValue())) == null : (value).equals((e.getValue())) );
}
public int hashCode() {
return (key) ^ ( (value) == null ? 0 : (value).hashCode() );
}
public String toString() {
return key + "->" + value;
}
}
/** Returns a type-specific-set view of the keys of this map.
*
* <P>The view is backed by the set returned by {@link #entrySet()}. Note that
* <em>no attempt is made at caching the result of this method</em>, as this would
* require adding some attributes that lightweight implementations would
* not need. Subclasses may easily override this policy by calling
* this method and caching the result, but implementors are encouraged to
* write more efficient ad-hoc implementations.
*
* @return a set view of the keys of this map; it may be safely cast to a type-specific interface.
*/
public CharSet keySet() {
return new AbstractCharSet () {
public boolean contains( final char k ) { return containsKey( k ); }
public int size() { return AbstractChar2ObjectMap.this.size(); }
public void clear() { AbstractChar2ObjectMap.this.clear(); }
public CharIterator iterator() {
return new AbstractCharIterator () {
final ObjectIterator<Map.Entry<Character,V>> i = entrySet().iterator();
public char nextChar() { return ((Char2ObjectMap.Entry <V>)i.next()).getCharKey(); };
public boolean hasNext() { return i.hasNext(); }
};
}
};
}
/** Returns a type-specific-set view of the values of this map.
*
* <P>The view is backed by the set returned by {@link #entrySet()}. Note that
* <em>no attempt is made at caching the result of this method</em>, as this would
* require adding some attributes that lightweight implementations would
* not need. Subclasses may easily override this policy by calling
* this method and caching the result, but implementors are encouraged to
* write more efficient ad-hoc implementations.
*
* @return a set view of the values of this map; it may be safely cast to a type-specific interface.
*/
public ObjectCollection <V> values() {
return new AbstractObjectCollection <V>() {
public boolean contains( final Object k ) { return containsValue( k ); }
public int size() { return AbstractChar2ObjectMap.this.size(); }
public void clear() { AbstractChar2ObjectMap.this.clear(); }
public ObjectIterator <V> iterator() {
return new AbstractObjectIterator <V>() {
final ObjectIterator<Map.Entry<Character,V>> i = entrySet().iterator();
public V next() { return ((Char2ObjectMap.Entry <V>)i.next()).getValue(); };
public boolean hasNext() { return i.hasNext(); }
};
}
};
}
@SuppressWarnings("unchecked")
public ObjectSet<Map.Entry<Character, V>> entrySet() {
return (ObjectSet)char2ObjectEntrySet();
}
/** Returns a hash code for this map.
*
* The hash code of a map is computed by summing the hash codes of its entries.
*
* @return a hash code for this map.
*/
public int hashCode() {
int h = 0, n = size();
final ObjectIterator<? extends Map.Entry<Character,V>> i = entrySet().iterator();
while( n-- != 0 ) h += i.next().hashCode();
return h;
}
public boolean equals(Object o) {
if ( o == this ) return true;
if ( ! ( o instanceof Map ) ) return false;
Map<?,?> m = (Map<?,?>)o;
if ( m.size() != size() ) return false;
return entrySet().containsAll( m.entrySet() );
}
public String toString() {
final StringBuilder s = new StringBuilder();
final ObjectIterator<? extends Map.Entry<Character,V>> i = entrySet().iterator();
int n = size();
Char2ObjectMap.Entry <V> e;
boolean first = true;
s.append("{");
while(n-- != 0) {
if (first) first = false;
else s.append(", ");
e = (Char2ObjectMap.Entry <V>)i.next();
s.append(String.valueOf(e.getCharKey()));
s.append("=>");
if (this == e.getValue()) s.append("(this map)"); else
s.append(String.valueOf(e.getValue()));
}
s.append("}");
return s.toString();
}
}
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