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Very simple database ORM

There is a newer version: 2.2.0

/*******************************************************************************************
 *	Copyright (c) 2016, zzg.zhou([email protected])
 * 
 *  Monalisa 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 program 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 .
 *******************************************************************************************/
package com.tsc9526.monalisa.tools.datatable;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * 
 * @author zzg.zhou([email protected])
 */
public class CaseInsensitiveMap extends LinkedHashMap {

	private static final long serialVersionUID = -5859767087732654080L;

	private transient Map keys=new HashMap();
	
	public T put(String key, T value) {
		if(key==null){
			return super.put(key, value);
		}else{
			String lower=key.toLowerCase();
			
			String origin=getKeys().get(lower);
			if(origin==null){
				origin=key;
				keys.put(lower, origin);
			}
			
			return super.put(origin, value);
		}
	}

	public T get(Object key) {
		return super.get(convertKey(key));
	}

	public boolean containsKey(Object key) {
		return super.containsKey(convertKey(key));
	}

	public T remove(Object key){
		return super.remove(convertKey(key));
	}
	 
	protected String convertKey(Object key) {
		if (key != null) {
			String lower=key.toString().toLowerCase();
			String origin=getKeys().get(lower);
			if(origin==null){
				origin=key.toString();
			}
			 
			return origin;
		} else {
			return null;
		}
	}
	
	protected Map getKeys(){
		// keys may be null if deserialize object, so reconstruct it
		if(keys==null){
			keys=new HashMap();
			for(String origin:keySet()){
				if(origin!=null){
					keys.put(origin.toLowerCase(), origin);
				}
			}
		}
		return keys;
	}
}