hashsetmap.java

这是一个matlab的java实现。里面有许多内容。请大家慢慢捉摸。

/* Copyright (C) 2003 Univ. of Massachusetts Amherst, Computer Science Dept.
   This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
   http://www.cs.umass.edu/~mccallum/mallet
   This software is provided under the terms of the Common Public License,
   version 1.0, as published by http://www.opensource.org.  For further
   information, see the file `LICENSE' included with this distribution. */

/**    HashMap that is a Set in that it only stores one copy of each value in the Map.			 
 *   @author Aron Culotta <A HREF="mailto:[e-mail]">[e-mail]</A>
*/

package edu.umass.cs.mallet.projects.dex.types;

import java.util.*;
import java.io.*;

public class HashSetMap implements Serializable{
	TreeSet values;
	HashMap map;
	
	public HashSetMap (int size) {
		map = new HashMap (size);
		values = new TreeSet ();
	}

	public HashSetMap () {
		this (10);
	}

	public Object put (Object key, Object value) {
		Object ret = map.put (key, value);
		values.add (value);
		return ret;
	}

	public void putAll (Map m) {
		map.putAll (m);
		Iterator iter = m.values().iterator();
		while (iter.hasNext()) 
			values.add (iter.next());		
	}

	public Collection values () {
		return values;
	}

	public Object remove (Object key) {
		Object v = map.remove (key);
		values.remove (v);
		return v;		
	}

	public void clear () {
		map.clear ();
		values = new TreeSet ();									
	}

	public boolean containsKey (Object k) { return map.containsKey (k); }
	public boolean containsValue (Object v) { return map.containsValue (v); }
	public Set entrySet () {return map.entrySet();}
	public Object get (Object k) {return map.get(k);}
	public boolean isEmpty () {return map.isEmpty();}
	public Set keySet () {return map.keySet();}
	public int size () {return map.size();}
	public boolean equals (Object o) {return map.equals(o);}
	public int hashCode () {return map.hashCode();}
	public String toString() {return map.toString();}
	public Object clone () {
		HashSetMap ret = new HashSetMap ();
		Iterator iter = keySet().iterator();
		while (iter.hasNext()) {
			Object k = iter.next();
			ret.put (k, get(k));
		}
		return ret;
	}

	// Serialization
	private static final long serialVersionUID = 1;
	private static final int CURRENT_SERIAL_VERSION = 1;
	
	private void writeObject (ObjectOutputStream out) throws IOException {
		out.writeInt (CURRENT_SERIAL_VERSION);
		out.writeObject (map);
		out.writeObject (values);
	}

	private void readObject (ObjectInputStream in) throws IOException, ClassNotFoundException {
		int version = in.readInt ();
		this.map = (HashMap) in.readObject();
		this.values = (TreeSet) in.readObject();
	}
	
}