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Azolla.org Core Library for Java
There is a newer version: 2.0.3
/*
 * @(#)KV.java		Created at 2013-7-4
 * 
 * Copyright (c) 2011-2013 azolla.org All rights reserved.
 * Azolla PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. 
 */
package org.azolla.l.ling.util;

import java.util.Map;

import com.google.common.collect.Maps;
import org.azolla.l.ling.json.Json0;

/**
 * The coder is very lazy for this KV class
 *
 * @author 	[email protected]
 * @since 	ADK1.0
 */
public final class KV
{
    Map map = Maps.newHashMap();

    private KV()
    {
        //do nothing
    }

    //	public static KV ins()
    //	{
    //		return new KV();
    //	}

    public static KV ins(String key, String value)
    {
        return new KV().put(key, value);
    }

    public static KV ins(String key, Object o)
    {
        return new KV().put(key, o);
    }

    public KV put(String key, String value)
    {
        map.put(key, value);
        return this;
    }

    public KV put(String key, Object o)
    {
        map.put(key, o2String(o));
        return this;
    }

    private String o2String(Object o)
    {
        String rtn = String.valueOf(o);

        if(null != o && o.getClass().isArray())
        {
            // check for primitive array types because they
            // unfortunately cannot be cast to Object[]
            if(o instanceof boolean[] || o instanceof Boolean[])
            {
                rtn = Array0.array2String((Boolean[]) o);
            }
            else if(o instanceof byte[] || o instanceof Byte[])
            {
                rtn = Array0.array2String((Byte[]) o);
            }
            else if(o instanceof char[] || o instanceof Character[])
            {
                rtn = Array0.array2String((Character[]) o);
            }
            else if(o instanceof short[] || o instanceof Short[])
            {
                rtn = Array0.array2String((Short[]) o);
            }
            else if(o instanceof int[] || o instanceof Integer[])
            {
                rtn = Array0.array2String((Integer[]) o);
            }
            else if(o instanceof long[] || o instanceof Long[])
            {
                rtn = Array0.array2String((Long[]) o);
            }
            else if(o instanceof float[] || o instanceof Float[])
            {
                rtn = Array0.array2String((Float[]) o);
            }
            else if(o instanceof double[] || o instanceof Double[])
            {
                rtn = Array0.array2String((Double[]) o);
            }
            else
            {
                rtn = Array0.array2String((Object[]) o);
            }
        }
        return rtn;
    }

    /**
     * @see org.azolla.l.ling.json.Json0#object2String(Object)
     * @param separator
     * @param connector
     * @return
     */
    @Deprecated
    public String toString(String separator, String connector)
    {
        separator = String.valueOf(separator);
        StringBuilder sb = new StringBuilder();
        for(Map.Entry entry : map.entrySet())
        {
            sb.append(separator).append(entry.getKey()).append(connector).append(entry.getValue());
        }
        return sb.toString().substring(separator.length());
    }

    @Override
    public String toString()
    {
        return Json0.object2String(map);
    }

    public static void main(String[] args)
    {
        StringBuilder sb = new StringBuilder();
        Object o = null;
        sb.append(o).append("a");
        System.out.println(sb.toString());
    }
}