package edu.vt.marian.WebGate;

import java.io.*;
import java.net.*;
import java.util.*;
import edu.vt.marian.common.*;


/** Class name: name_value_pair
	Class description: this class represent a name value pair
	Author: Jianxin Zhao
	Finished time: ????, 1998
	Known bugs: none
	Platform: jdk1.1.5 under UNIX
*/

public class name_value_pair
{
	/** this is just for debugging
	*/
	Debug debug;

	/** this is the name of this object
	*/
	private String name;

	/** this is the value of this object
	*/
	private String value;

	/** this constructor will create a name value pair object, the object is empty
		upon creation
	*/
	public name_value_pair(Debug debug)
	{
		// first initialize data members
		init();
		this.debug = debug;
	}

	/** this constructor will create a name value pair object with the specified
		name and value
	*/
	public name_value_pair(String name, String value, Debug debug)
	{
		// first initialize data members
		init();
		this.debug = debug;
		set_name(name);
		set_value(value);
	}

	/** this constructor will create a name value pair object from a stream
	*/
	public name_value_pair(BufferedReader br, Debug debug)
	{
		// first initialize data members
		init();
		this.debug = debug;
		try
		{
			// read out the name of this object from the stream
			String name = new String("");
			int number_lines = Integer.parseInt(br.readLine());
			int i;
			for (i = 0; i < number_lines; i++)
			{
				if (i > 0)
				{
					// we don't add "\n" at the beginning of the first
					// line
					name += "\n" + br.readLine();
				}
				else
				{
					name += br.readLine();
				}
			}
			if (i != 0)
			{
				set_name(name);
			}
			// readout the value of this object from this stream
			String value = new String("");
			number_lines = Integer.parseInt(br.readLine());
			for (i = 0; i < number_lines; i++)
			{
				if (i > 0)
				{
					// we don't add "\n" at the beginning of the first
					// line
					value += "\n" + br.readLine();
				}
				else
				{
					value += br.readLine();
				}
			}
			if (i != 0)
			{
				set_value(value);
			}
		}
		catch (IOException e)
		{
			debug.dumpTrace("class nvp: error read name value pair from stream");
		}
	}

	/** this method will set the name of this object
	*/
	public String set_name(String name)
	{
		if (name == null)
		{
			this.name = null;
			return "ok";
		}

		// name not empty
		this.name = new String(name);
		return "OK";
	}

	/** this method will return the name of this object
	*/
	public String get_name()
	{
		if (name == null)
		{
			return null;
		}
		return new String(name);
	}

	/** this method will set the value of this object
	*/
	public String set_value(String value)
	{
		if (value == null)
		{
			this.value = null;
			return "ok";
		}
		this.value = new String(value);
		return "OK";
	}

	/** this method will return the value of this object
	*/
	public String get_value()
	{
		if (value == null)
		{
			return null;
		}
		return new String(value);
	}

	/** this method will print the content of this object to a stream
	*/
	public String to_stream(PrintWriter pw)
	{
		// used to count lines
		LinedString ms = new LinedString(debug);
		// write the name of this object
		String s = get_name();
		if (s == null)
		{
			pw.println("0");
		}
		else
		{
			pw.println(ms.count_lines(s));
			pw.println(s);
		}

		// write the value of this object
		s = get_value();
		if (s == null)
		{
			pw.println("0");
		}
		else
		{
			pw.println(ms.count_lines(s));
			pw.println(s);
		}
		return "OK";
	}

	/** this method will initialize the data members of this object
	*/
	private void init()
	{
		debug = null;
		name = null;
		value = null;
	}
}