dict.java

来自「为公司做的质量考核接口源码,用spring,hibernate,XML实现,对X」· Java 代码 · 共 31 行

package com.jr81.source.compression;

import java.util.* ;

	// The dictionary
public class Dict {
		// mp keeps : Word => Index
		// ls keeps : Index => Word
	Map mp = new HashMap() ;
	List ls = new ArrayList() ;
		// Adds an element into the dictionary
	public void add(ByteArray str)
		{ mp.put(str,new Integer(ls.size())) ;
		  ls.add(str) ;
		  }
		// Gets the number for the given string.
		// If it does not exist, returns -1
	public final int numFromStr(ByteArray str)
		{ return ( mp.containsKey(str) ?
				   ((Integer)mp.get(str)).intValue() :
				   -1 ) ; }
		// Gets the string for the given number
		// If the number does not exist, return null
	public final ByteArray strFromNum(int i)
		{ return ( i<ls.size() ?
				   (ByteArray) ls.get(i) :
				   null ) ; }
	public final int size()
		{ return ls.size() ; }
} ;