Metacat

import java.io.PrintWriter;

import java.io.IOException;

import java.util.Enumeration;

import java.util.Hashtable;

import javax.servlet.ServletConfig;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpUtils;

/**

 * A metadata catalog server implemented as a Java Servlet

 */

public class MetaCatServlet extends HttpServlet {

  private ServletConfig		config = null;

  private ServletContext	context = null;

  DBSimpleQuery		queryobj = null;

  static  String 	user = "jones";

  static  String 	password = "your-pw-goes-here";

  static  String 	defaultDB = "jdbc:oracle:thin:@localhost:1521:test";

  public void init( ServletConfig config ) throws ServletException {

    try {

      super.init( config );

      this.config = config;

      this.context = config.getServletContext();

      try {

        queryobj = new DBSimpleQuery(user, password, defaultDB);

      } catch (Exception e) {

      }

    } catch ( ServletException ex ) {

      throw ex;

    }

  }

  public void doGet (HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

    PrintWriter out;

    // Get the parameters from the form

    String querystring = request.getQueryString();

    Hashtable params = HttpUtils.parseQueryString(querystring);

    String[] query = (String[])params.get("query"); 

    // Run the query

    Hashtable nodelist = queryobj.findRootNodes(query[0]);

    // set content type and other response header fields first

    response.setContentType("text/xml");

    // then write the data of the response

    out = response.getWriter();

    // Print the reulting root nodes

    long nodeid;

    out.println("<?xml version=\"1.0\"?>\n");

    out.println("<resultset>\n");

    out.println("  <query>" + query[0] + "</query>");

    Enumeration rootlist = nodelist.keys(); 

    while (rootlist.hasMoreElements()) {

      nodeid = ((Long)rootlist.nextElement()).longValue();

      out.println("  <nodeid>" + nodeid + "</nodeid>");

    }

    out.println("</resultset>");

    out.close();

  }

  public void doPost( HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

    PrintWriter out;

    // set content type and other response header fields first

    response.setContentType("text/html");

    // then write the data of the response

    out = response.getWriter();

    out.println("POST detected");

    out.close();

  }

}