package org.autoplot.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.ParseException;
import java.util.Collections;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.das2.datum.Datum;
import org.das2.datum.DatumRange;
import org.das2.datum.DatumRangeUtil;
import org.das2.datum.TimeParser;
import org.das2.datum.Units;
import org.das2.fsm.FileStorageModel;
import org.das2.util.filesystem.FileSystem;
/**
* URI Templates servlet implements the hybrid generate/parse method
* for resolving URIs.
* @author jbf
*/
public class URITemplatesServlet extends HttpServlet {
private boolean supportsGenerate( String s ) {
return !(s.contains("$v") || s.contains("$(v") ||
s.contains("$x") || s.contains("$(x") ||
s.contains(";sparse") || s.contains(",sparse")); // TODO: make canonical!!!
}
private int doParse( DatumRange trdr, String root, String template, PrintWriter out ) throws IOException {
int count= 0;
FileSystem fs= FileSystem.create( root );
FileStorageModel fsm= FileStorageModel.create( fs, template );
fsm.setContext( trdr );
String[] names= fsm.getNamesFor( trdr );
for ( String n : names ) {
out.printf( "<tr>" );
DatumRange tr= fsm.getRangeFor( n );
String v;
try {
v= fsm.getField("v",n);
} catch ( Exception ex ) {
v= "N/A";
}
out.printf( "<td>"+root + "/" + n + "</td><td>"+tr.toString() + "</td><td>" + v +"</td>\n" );
out.printf( "</tr>" );
count= count+1;
}
return count;
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>URI Templates</title>");
out.println("</head>");
out.println("<body>");
String uri= request.getParameter("resourceURI");
String timerange= request.getParameter("timerange");
if ( (timerange.split(" ") ).length==10 ) { // make it easier to use Jon V.'s document "uri_template_test_cases.txt"
String[] trs= timerange.split(" ");
timerange= String.format( "%s-%s-%sT%s:%s/%s-%s-%sT%s:%s", (Object[]) trs );
}
long t0= System.currentTimeMillis();
DatumRange drtr;
try {
drtr= DatumRangeUtil.parseTimeRange(timerange);
} catch ( ParseException ex ) {
throw new RuntimeException( "unable to parse timerange",ex );
}
String[] ss= uri.split("/");
StringBuilder generateUriBuilder= new StringBuilder(ss[0]);
int i=1;
while ( i<ss.length && supportsGenerate(ss[i]) ) {
generateUriBuilder.append("/").append(ss[i]);
i++;
}
String generateUri= generateUriBuilder.toString();
String parseUri;
if ( generateUri.length()==uri.length() ) {
parseUri= "";
} else {
parseUri= uri.substring(generateUri.length()+1);
}
TimeParser tp= TimeParser.create(generateUri);
int i1= generateUri.indexOf("$(enum;");
String[] enums;
String id;
if ( i1>-1 ) {
int ix= generateUri.indexOf("$(enum",i1+6);
if (ix>-1 ) {
throw new IllegalArgumentException( "Template can only contain one $(enum)." );
} else {
TimeParser.EnumFieldHandler fh= (TimeParser.EnumFieldHandler) tp.getFieldHandlerByCode("enum");
enums= fh.getValues();
id= fh.getId();
}
} else {
enums= new String[] { "" };
id= "";
}
String st= tp.format( drtr.min(), null, Collections.singletonMap( id, enums[0] ) );
DatumRange dr;
try {
dr = tp.parse( st,null ).getTimeRange();
} catch (ParseException ex) {
throw new RuntimeException("unable to parse timerange",ex);
}
out.printf( "<h1>Hybrid generate/parse result</h1>");
out.printf( "<h3>%s</h3>\n", uri );
out.printf( "<p>search limited to %s</p>\n", timerange );
if ( parseUri.length()==0 ) {
out.printf( "<p>generation used for entire URI</p>\n" );
} else {
out.printf( "<p>generation used for " + generateUri + ", parsing for " +parseUri + " </p>\n" );
}
out.printf( "<table border=1>\n" );
out.printf( "<tr><td>Filename</td><td>Time Range</td><td>Version</td></tr>" );
int count= 0;
Datum stop= drtr.max().subtract( Datum.create(500,Units.ns ) ); //2010-03-01T00:00:00/10 http://data.org/data_$Y_$j_$H$M$S.$(subsec;places=1) would have extra because of roundoff.
while ( count<=10000 && dr.min().lt( stop ) ) {
for ( String enum1 : enums ) {
st= tp.format( dr.min(), dr.max(), Collections.singletonMap( id, enum1 ) );
if ( parseUri.length()==0 ) {
out.printf( "<tr><td>"+st + "</td><td>"+dr + "</td><td>N/A</td><tr>\n" );
count++;
} else {
count+= doParse( drtr, st, parseUri, out );
}
if ( count>10000 ) {
out.printf( "<tr><td></td><td>Search limited to 10000 results.</td></tr>" );
break;
}
dr= dr.next();
}
}
out.println( "</table>");
long dt= System.currentTimeMillis() - t0;
out.printf("%d results calculated in %d milliseconds.\n",count,dt);
out.println("</body>");
out.println("</html>");
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}