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Java JSON Tools core library. It is independent of third party libraries. It is meant to minimize transitive dependencies. Applications of the JSON tools which relate to other libraries will be in separate optional pacakges.
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package com.sdicons.json.model;

/*
    JSONTools - Java JSON Tools
    Copyright (C) 2006 S.D.I.-Consulting BVBA
    http://www.sdi-consulting.com
    mailto://[email protected]

    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 2.1 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 library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

import com.sdicons.json.parser.impl.ParserUtil;

import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;

/**
 * Representation of a JSON object, a collection (unordered) of name/value pairs.
 * An example: {"name":"Homer", "age":40, "children":["Bart", "Maggie", "Lisa"]}
 */
public class JSONObject
extends JSONComplex
{
    // It is very important that the implementation is based on a linked hash map.
    // The order of JSON object elements should remain in the same order as they are encountered.
    // Especially the serializer relies on it.
    private HashMap map = new LinkedHashMap();

    public int size()
    {
        return map.size();
    }

    public HashMap getValue()
    {
        return map;
    }

    public String toString()
    {
        final StringBuffer lBuf = new StringBuffer();
        lBuf.append("JSONObject(").append(getLine()).append(":").append(getCol()).append(")[");
        Iterator lIter = map.keySet().iterator();
        while(lIter.hasNext())
        {
            final String lKey=lIter.next();
            lBuf.append(lKey).append(":").append(map.get(lKey).toString());
            if(lIter.hasNext()) lBuf.append(", ");
        }
        lBuf.append("]");
        return lBuf.toString();
    }

    protected String render(boolean aPretty, String aIndent)
    {
        final StringBuffer lBuf = new StringBuffer();
        final Iterator lKeyIter = map.keySet().iterator();
        if(aPretty)
        {
            lBuf.append(aIndent).append("{\n");
            final String lIndent = aIndent + "   ";
            final String lIndent2 = aIndent + "      ";
            while(lKeyIter.hasNext())
            {
                final String lKey = lKeyIter.next();
                final JSONValue jsonValue = (com.sdicons.json.model.JSONValue) map.get(lKey);

                lBuf.append(lIndent).append(ParserUtil.render(lKey, false, ""));
                if(jsonValue.isSimple())
                {
                    lBuf.append(" : ").append(jsonValue.render(false, ""));

                }
                else
                {
                    lBuf.append(" :\n").append(jsonValue.render(true, lIndent2));
                }
                if(lKeyIter.hasNext()) lBuf.append(",\n");

                else lBuf.append("\n");
            }
            lBuf.append(aIndent).append("}");
        }
        else
        {
            lBuf.append("{");
            while(lKeyIter.hasNext())
            {
                final String lKey = lKeyIter.next();
                final JSONValue jsonValue = (com.sdicons.json.model.JSONValue) map.get(lKey);

                lBuf.append(ParserUtil.render(lKey, false, "")).append(":").append(jsonValue.render(false));
                if(lKeyIter.hasNext()) lBuf.append(",");
            }
            lBuf.append(aIndent).append("}");
        }
        return lBuf.toString();
    }

    public boolean equals(Object o)
    {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        final JSONObject that = (JSONObject) o;

        if (!map.equals(that.map)) return false;

        return true;
    }

    public int hashCode()
    {
        return map.hashCode();
    }

    public boolean containsKey(String aKey)
    {
        return map.containsKey(aKey);
    }

    /**
     * Utility method, get the element with specified name without having to
     * retreive the map first using getValue().
     * @param aKey The key for which you want to retrieve the element.
     * @return The element corresponding to the key or null if the object
     * does not contain a key with this name.
     */
    public JSONValue get(String aKey)
    {
        return map.get(aKey);
    }

    /**
     * Remove all JSON related information. In the case of a JSONObject, a HashMap is returned.
     * The values of the HashMap are stripped as well.
     * @return a HashMap, containing pure Java objects.
     */
    public Object strip()
    {
        HashMap lResult = new HashMap();
        for(String lKey : map.keySet())
        {
            lResult.put(lKey, map.get(lKey).strip());
        }
        return lResult;
    }
}