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The DSI utilities are a mish mash of classes accumulated during the last ten years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.

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package it.unimi.dsi.util;

/*		 
 * DSI utilities
 *
 * Copyright (C) 2008-2016 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 3 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 program; if not, see .
 *
 */

import it.unimi.dsi.fastutil.objects.Object2ObjectFunction;
import it.unimi.dsi.fastutil.objects.Object2ObjectFunctions;
import it.unimi.dsi.fastutil.objects.ObjectList;
import it.unimi.dsi.fastutil.objects.ObjectLists;

import java.io.Serializable;

/** A class providing static methods and objects that do useful things with {@linkplain StringMap string maps}
 * and {@linkplain PrefixMap prefix maps}.
 * 
 * @see StringMap
 * @see PrefixMap
 * @author Sebastiano Vigna
 */

public class StringMaps {
	private StringMaps() {}
	
	protected static class SynchronizedStringMap implements StringMap, Serializable {
		private static final long serialVersionUID = 1L;
		protected final StringMap stringMap;
		protected ObjectList list;

		public SynchronizedStringMap( final StringMap stringMap ) {
			this.stringMap = stringMap;
		}

		public synchronized int size() {
			return stringMap.size();
		}

		public synchronized ObjectList list() {
			if ( list == null ) {
				list = stringMap.list();
				if( list != null ) list = ObjectLists.synchronize( list, this ); 
			}
			return list;
		}

		public synchronized long getLong( Object s ) {
			return stringMap.getLong( s );
		}	

		public synchronized Long get( Object key ) {
			return stringMap.get( key );
		}

		public synchronized long put( CharSequence key, long value ) {
			return stringMap.put(  key, value );
		}

		public synchronized Long put( CharSequence key, Long value ) {
			return stringMap.put( key, value );
		}

		public synchronized Long remove( Object key ) {
			return stringMap.remove( key );
		}

		public synchronized long removeLong( Object key ) {
			return stringMap.removeLong( key );
		}
		
		public synchronized void clear() {
			stringMap.clear();
		}

		public synchronized boolean containsKey( Object key ) {
			return stringMap.containsKey( key );
		}

		public synchronized long defaultReturnValue() {
			return stringMap.defaultReturnValue();
		}

		public synchronized void defaultReturnValue( long rv ) {
			stringMap.defaultReturnValue( rv );
		}
	}
	

	protected static class SynchronizedPrefixMap extends SynchronizedStringMap implements PrefixMap, Serializable {
		private static final long serialVersionUID = 1L;
		protected final PrefixMap map;
		protected Object2ObjectFunction prefixMap;
		protected Object2ObjectFunction rangeMap;

		public SynchronizedPrefixMap( final PrefixMap map ) {
			super( map );
			this.map = map;
		}

		public synchronized Object2ObjectFunction prefixMap() {
			if ( prefixMap == null ) {
				prefixMap = map.prefixMap();
				if ( prefixMap != null ) prefixMap = Object2ObjectFunctions.synchronize( prefixMap, this );
			}
			return prefixMap;
		}

		public synchronized Object2ObjectFunction rangeMap() {
			if ( rangeMap == null ) {
				rangeMap = map.rangeMap();
				if ( rangeMap != null ) rangeMap = Object2ObjectFunctions.synchronize( rangeMap, this );
			}
			return rangeMap;
		}


	}
	
	/** Returns a synchronized string map backed by the given string map.
     *
     * @param stringMap the string map to be wrapped in a synchronized map.
     * @return a synchronized view of the specified string map.
     */
	public static  StringMap synchronize( final StringMap stringMap ) {
		return stringMap instanceof PrefixMap ? new SynchronizedPrefixMap( (PrefixMap)stringMap ) : new SynchronizedStringMap( stringMap );
	}

	/** Returns a synchronized prefix map backed by the given prefix map.
    *
    * @param prefixMap the prefix map to be wrapped in a synchronized map.
    * @return a synchronized view of the specified prefix map.
    */
	public static  PrefixMap synchronize( final PrefixMap prefixMap ) {
		return new SynchronizedPrefixMap( prefixMap );
	}
}