/*
 * $Id: JSONObject.java,v 1.1 2006/04/15 14:10:48 platform Exp $
 * Created on 2006-4-10
 */
package org.json.simple;

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import rejava.io.StringWriter;
import rejava.io.Writer;

/**
 * A JSON object. Key value pairs are unordered. JSONObject supports
 * java.util.Map interface.
 * 
 * @author FangYidong<fangyidong@yahoo.com.cn>
 */
@SuppressWarnings("rawtypes")
public class JSONObject extends HashMap<String, Object> implements Map<String, Object>, JSONAware,
		JSONStreamAware {

	private static final long serialVersionUID = -503443796854799292L;

	public JSONObject() {
		super();
	}

	/**
	 * Allows creation of a JSONObject from a Map. After that, both the
	 * generated JSONObject and the Map can be modified independently.
	 * 
	 * @param map
	 */
	@SuppressWarnings({ "unchecked" })
	public JSONObject(final Map map) {
		super(map);
	}

	/**
	 * Encode a map into JSON text and write it to out. If this map is also a
	 * JSONAware or JSONStreamAware, JSONAware or JSONStreamAware specific
	 * behaviours will be ignored at this top level.
	 * 
	 * @see org.json.simple.JSONValue#writeJSONString(Object, Writer)
	 * 
	 * @param map
	 * @param out
	 */
	public static void writeJSONString(final Map map, final Writer out) throws IOException {
		if (map == null) {
			out.write("null");
			return;
		}

		boolean first = true;
		final Iterator iter = map.entrySet().iterator();

		out.write('{');
		while (iter.hasNext()) {
			if (first) {
				first = false;
			} else {
				out.write(',');
			}
			final Map.Entry entry = (Map.Entry) iter.next();
			out.write('\"');
			out.write(JSONObject.escape(String.valueOf(entry.getKey())));
			out.write('\"');
			out.write(':');
			JSONValue.writeJSONString(entry.getValue(), out);
		}
		out.write('}');
	}

	@Override
	public void writeJSONString(final Writer out) throws IOException {
		JSONObject.writeJSONString(this, out);
	}

	/**
	 * Convert a map to JSON text. The result is a JSON object. If this map is
	 * also a JSONAware, JSONAware specific behaviours will be omitted at this
	 * top level.
	 * 
	 * @see org.json.simple.JSONValue#toJSONString(Object)
	 * 
	 * @param map
	 * @return JSON text, or "null" if map is null.
	 */
	public static String toJSONString(final Map map) {
		final StringWriter writer = new StringWriter();

		try {
			JSONObject.writeJSONString(map, writer);
			return writer.toString();
		} catch (final IOException e) {
			// This should never happen with a StringWriter
			throw new RuntimeException(e);
		}
	}

	@Override
	public String toJSONString() {
		return JSONObject.toJSONString(this);
	}

	@Override
	public String toString() {
		return this.toJSONString();
	}

	public static String toString(final String key, final Object value) {
		final StringBuffer sb = new StringBuffer();
		sb.append('\"');
		if (key == null) {
			sb.append("null");
		} else {
			JSONValue.escape(key, sb);
		}
		sb.append('\"').append(':');

		sb.append(JSONValue.toJSONString(value));

		return sb.toString();
	}

	/**
	 * Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters
	 * (U+0000 through U+001F). It's the same as JSONValue.escape() only for
	 * compatibility here.
	 * 
	 * @see org.json.simple.JSONValue#escape(String)
	 * 
	 * @param s
	 * @return
	 */
	public static String escape(final String s) {
		return JSONValue.escape(s);
	}

}