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package dk.thoerup.traininfoservice; |
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import java.io.IOException; |
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import java.sql.Connection; |
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import java.sql.PreparedStatement; |
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import java.sql.ResultSet; |
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import java.sql.SQLException; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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import javax.servlet.ServletException; |
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import javax.servlet.http.HttpServlet; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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/** |
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* Servlet implementation class LocateStations |
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*/ |
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public class LocateStations extends HttpServlet { |
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private static final long serialVersionUID = 1L; |
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Logger logger = Logger.getLogger( LocateStations.class.toString() ); |
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protected String transformToIntList(String input) { |
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String strings[] = input.split(","); |
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StringBuffer sb = new StringBuffer(); |
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sb.append("("); |
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for (int i = 0; i<strings.length; i++) { |
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if (i>0) { |
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sb.append(","); |
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} |
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sb.append( Integer.parseInt(strings[i])); //by doing the integer conversion we ensure that it really is a integer |
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} |
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sb.append(")"); |
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return sb.toString(); |
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} |
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protected PreparedStatement createStatement(Connection conn, HttpServletRequest req) throws SQLException { |
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PreparedStatement stmt = null; |
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String SQL; |
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if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) { |
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//inner select is workaround from not being able to use a calculated column directly in where clause |
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SQL = "SELECT * FROM ( "+ |
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" SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address," + |
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" earth_distance( ll_to_earth(latitude,longitude), ll_to_earth(?,?))::int AS calcdist " + |
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" FROM trainstations " + |
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" WHERE enabled = true " + |
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" ) AS trainstations2 " + |
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"ORDER BY calcdist ASC " + |
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"LIMIT 4 "; |
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double latitude = Double.parseDouble( req.getParameter("latitude") ); |
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double longitude = Double.parseDouble( req.getParameter("longitude") ); |
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stmt = conn.prepareStatement(SQL); |
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stmt.setDouble(1, latitude); |
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stmt.setDouble(2, longitude); |
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} else if (req.getParameter("name") != null) { |
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SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + |
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"FROM trainstations " + |
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"WHERE name ILIKE ? AND enabled = true " + |
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"ORDER BY name "; |
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String name = req.getParameter("name").trim(); |
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stmt = conn.prepareStatement(SQL); |
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stmt.setString(1, name + "%"); |
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} else if (req.getParameter("list") != null) { |
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String list = transformToIntList( req.getParameter("list")); |
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SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0 " + |
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"FROM trainstations " + |
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"WHERE id IN " + list + " AND enabled = true " + |
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"ORDER BY name "; |
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stmt = conn.prepareStatement(SQL); |
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} |
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return stmt; |
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} |
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protected String formatResultset(PreparedStatement stmt) throws SQLException { |
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ResultSet res = null; |
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StringBuffer buff = new StringBuffer(); |
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buff.append("<?xml version=\"1.0\" ?>\n"); |
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buff.append("<stations>\n"); |
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try |
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{ |
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res = stmt.executeQuery(); |
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while (res.next()) { |
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buff.append("<station>\n"); |
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buff.append("<id>").append( res.getInt(1) ).append("</id>\n"); |
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buff.append("<name>").append( res.getString(2) ) .append("</name>\n"); |
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buff.append("<latitude>").append( res.getDouble(3) ) .append("</latitude>\n"); |
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buff.append("<longitude>").append( res.getDouble(4) ) .append("</longitude>\n"); |
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res.getString(5); |
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buff.append("<fjerntog>").append( !res.wasNull() ) .append("</fjerntog>\n"); |
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res.getString(6); |
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buff.append("<stog>").append( !res.wasNull() ) .append("</stog>\n"); |
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res.getString(7); |
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buff.append("<metro>").append( !res.wasNull() ).append("</metro>\n"); |
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String address = res.getString(8); |
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buff.append("<address>").append( res.wasNull() ? "" : address ).append("</address>"); |
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buff.append("<calcdist>").append( res.getInt(9) ) .append("</calcdist>\n"); |
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buff.append("</station>\n"); |
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} |
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} finally { |
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if (res != null && !res.isClosed()) |
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res.close(); |
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if (stmt != null && !stmt.isClosed()) |
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stmt.close(); |
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} |
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buff.append("</stations>\n"); |
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return buff.toString(); |
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} |
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@Override |
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { |
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Connection conn = null; |
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try { |
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conn = DBConnection.getConnection(); |
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PreparedStatement stmt = createStatement(conn, request); |
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if (stmt != null){ |
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String xml = formatResultset(stmt); |
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response.setContentType("text/xml"); |
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response.getWriter().print(xml); |
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} else { |
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response.sendError(400, "not enough parameters"); |
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} |
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} catch (Exception e) { |
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logger.log(Level.SEVERE, "Exception while finding stations", e); |
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response.sendError(500); |
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} finally { |
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try { |
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if (conn != null) { |
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conn.close(); |
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} |
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} catch (Exception t) {} |
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} |
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} |
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} |