import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

import java.net.Socket;
import java.net.UnknownHostException;


public class HttpConnection 
{

	// Holds target port number for Connection.
	private int HTTP_PORT = 80; 
	
	// Holds target url.
	private String resource;
	
	// Holds target server address.
	private String host;
	
	// Holds target file address.
	private String file;

	// Setting defalt HTTP request method to Get.
	private	String method = "GET";
	
	// Holds body length of request. 
	private String contentLen = "";
	
	// Setting default content Type to text/html.
	private String type = "text/html";
	private String contentType; 

	// Socket object for connection.
	private	Socket httpSocket=null;
	
	// Holds all HTTP headers that our class will initialize.
	private StringBuffer defaultHTTPHeaders;
	
 	// Holds all HTTP headers that user will initialize.
	private StringBuffer 
	userDefinedHTTPHeaders = new StringBuffer();

	private InputStream in=null;
	private OutputStream out=null;
	
		
	// Constructor with URL and Port number as argument.
	// It opens a socket connection at provided URL.
	public HttpConnection (String url, int port) 
	throws UnknownHostException, IOException 
	{
		if (port > 0 )
			HTTP_PORT = port;
		
		// Extracting file and host addresses from the URL. 
		resolveURL(url);
		
		httpSocket = new Socket(host,HTTP_PORT);
		defaultHTTPHeaders = new StringBuffer();
    }//HttpConnection()
	
	
	// Returns input stream for received data.
    public InputStream getInputStream() throws IOException 
	{
		return in = httpSocket.getInputStream();
	}//getInputStream()
	
	
	
	// Returns output stream for data to be sent.
	public OutputStream getOutputStream() throws IOException 
	{
		return out = httpSocket.getOutputStream();
	}//getOutputStream()
	
		
	// Parses the passed URL e.g. 
	"http://www.xyz.com/tariqspage/soap "
	// and extract Host address i.e. "www.xyz.com" 
	// and File name i.e. "/tariqspage/soap" from URL.
	private void resolveURL(String url)
	{
		resource = url.substring (7);
		int slashpos = resource.indexOf ("/");
		file = resource.substring (slashpos);
		host = resource.substring (0,slashpos);
	}//resolveURL()
	
	
	// Set request method for http request. 
	public void setRequestMethod (String method)
	{
		this.method = method;
	}

	
	// Set Content Type Header for request.
	public void setContentType (String type)
	{
		this.type = type;
	}//setContentType
	

	// Sets content length of the request data.
	public void setContentLength (int length)
	{
		contentLen = 
		"Content-length:"+String.valueOf(length)+"\r\n";
	}//setDataLength()
	

	
	// Returs Content Type Header.
	public String getContentType () 
	{
		System.out.println("GetContentType Called.......");
		return this.contentType;
	}//getContentType ()
	
	
	// Returs Request Method Header.
	public String getRequestMethod () 
	{
		return this.method;
	}//getRequestMethod()
	
	
	// Sets additional user defined headers.
	public void setRequestProperty (String name, String value)
	{
		userDefinedHTTPHeaders.append(name+" "+value+"\r\n");
	}//setRequestProperty()
	
	
	// Concatenating headers from buffer strings 
	// into a single String and Returns it.
	public String getHeaders()
	{
		defaultHTTPHeaders.append(method+" 
		"+file+" HTTP/1.1\r\n");
		defaultHTTPHeaders.append("Host: "+host+"\r\n");
		defaultHTTPHeaders.append
		("Content-type: "+type+"; charset=utf-8\r\n");
		defaultHTTPHeaders.append(contentLen);
			
		// Appending empty line at end of headers.
		userDefinedHTTPHeaders.append("\r\n");
		
		// Concatenating two string buffers containing headers
		// into single String named "Headers".
		String headers = defaultHTTPHeaders.toString();
		headers +=userDefinedHTTPHeaders.toString();
		
		return headers;
	}//getHeaders()
	
}//class