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Diff for /java/classes/org/w3c/rdf/examples/SiRPACServlet.java between versions 1.3 and 1.4

version 1.3, 2000/10/05 03:56:30 version 1.4, 2000/10/09 00:26:16
Line 13 Line 13
  * This servlet is a wrapper for the SiRPAC RDF parser.  The servlet    * This servlet is a wrapper for the SiRPAC RDF parser.  The servlet 
  * expects two incoming variables through the POST method:   * expects two incoming variables through the POST method:
  *   *
  * 1. The RDF/XML document via the 'RDF' variable   * 1. "RDF" - the RDF/XML document 
  * 2. The checkbox status via the 'BAGS' variable (='on' when activated)   * 2. "BAGS" - if "on", each Description should have its own Bag;
    *   the default is not to do this.
  *   *
  * @author Janne Saarela <jsaarela@w3.org>   * @author Janne Saarela <jsaarela@w3.org>
  *   *
Line 48  public class SiRPACServlet extends HttpS Line 49  public class SiRPACServlet extends HttpS
 {  {
     final static public String  REVISION = "$Id$";      final static public String  REVISION = "$Id$";
   
     // @@       // @@ The email address for bug reports
     private static final String MAIL_TO = "barstow@mediaone.net";      private static final String MAIL_TO = "barstow@w3.org";
     
     // Names of the servlet's parameters      // Names of the servlet's parameters
     private static final String SIRPAC_TMP_DIR = "SIRPAC_TMP_DIR";      private static final String SIRPAC_TMP_DIR = "SIRPAC_TMP_DIR";
     private static final String DOT_PATH = "DOT_PATH";      private static final String DOT_PATH       = "DOT_PATH";
     private static final String DOT_LIB_DIR = "DOT_LIB_DIR";      private static final String DOT_LIB_DIR    = "DOT_LIB_DIR";
     private static final String DOT_FONT_DIR = "DOT_FONT_DIR";      private static final String DOT_FONT_DIR   = "DOT_FONT_DIR";
   
     // Variables for the servlet's parameters      // Variables for the servlet's parameters
     private static String m_SiRPACTmpDir = null;      private static String m_SiRPACTmpDir = null;
     private static String m_DotPath = null;      private static String m_DotPath      = null;
     private static String m_DotFontDir = null;      private static String m_DotFontDir   = null;
     private static String m_DotLibDir = null;      private static String m_DotLibDir    = null;
   
       // Names of environment variable need by GraphVis
       private static String DOTFONTPATH     = "DOTFONTPATH";
       private static String LD_LIBRARY_PATH = "LD_LIBRARY_PATH";
   
       // Names used for temporary files
       private static final String TMP_FILE_PREFIX = "sirpac_";
       private static final String TMP_DIR_SUFFIX  = ".tmp";
       private static final String DOT_SUFFIX      = ".dot";
       private static final String GIF_SUFFIX      = ".gif";
   
     // The parser      // The parser
     private SiRPAC        m_sirpac = null;      private SiRPAC        m_sirpac = null;
Line 69  public class SiRPACServlet extends HttpS Line 80  public class SiRPACServlet extends HttpS
     private ErrorStore    m_errorHandler;      private ErrorStore    m_errorHandler;
   
     /*      /*
      * Create a temporary PrintWriter object       * Create a File object in the m_SiRPACTmpDir directory
      *       *
      *@return a PrintWriter object if a temporary file is created;        *@param directory the file's directory
      *  null otherwise       *@param prefix the file's prefix name (not its directory)
        *@param suffix the file's suffix or extension name
        *@return a File object if a temporary file is created; null otherwise
      */       */
 /*      private File createTempFile (String directory, String prefix, String suffix) {
     private String getTempFileName (PrintWriter pw) {          File f;
           try {
               File d = new File(directory);
               f = File.createTempFile(prefix, suffix, d);
           } catch (Exception e) {
               return null;
           }
           return f;
       }
   
       /*
        * Invokes the GraphVis program to create a GIF image from the
        * the given DOT data file
        *
        *@param dotFileName the name of the DOT data file
        *@param gifFileName the name of the GIF data file 
        *@return true if success; false if any failure occurs
        */
       private boolean generateGifFile(String dotFileName, String gifFileName) {
           String environment[] = {DOTFONTPATH     + "=" + m_DotFontDir,
                                   LD_LIBRARY_PATH + "=" + m_DotLibDir};
   
           String cmdArray[] = {m_DotPath, "-Tgif", "-o", gifFileName, dotFileName};
   
           Runtime rt = Runtime.getRuntime();
           try {
               Process p = rt.exec(cmdArray, environment);
               p.waitFor();
           } catch (Exception e) {
               return false;
           }
   
           return true;
     }      }
 */  
   
     /*      /*
      * Generate a graph of the RDF data model       * Generate a graph of the RDF data model
      *       *
      *@param out       *@param out the servlet's output stream
      *@param rdf       *@param rdf the request
      *@param req       *@param req the response
      */       */
     private void generateGraph (ServletOutputStream out, String rdf, HttpServletRequest req) {      private void generateGraph (ServletOutputStream out, String rdf, HttpServletRequest req) {
         try {          try {
             out.println("<hr title=\"visualisation\">");              out.println("<hr title=\"visualisation\">");
             out.println("<h3>Graph of the data model</h3>");              out.println("<h3>Graph of the data model</h3>");
   
             // No need to continue if any of the parameters are missing              // Stop if any of the parameters are missing
             if (m_SiRPACTmpDir == null || m_DotPath == null ||               if (m_SiRPACTmpDir == null || m_DotPath == null || 
                 m_DotFontDir == null || m_DotLibDir == null) {                   m_DotFontDir == null || m_DotLibDir == null) { 
                 out.println("Servlet initialization failed.  A graph cannot be generated.");                  out.println("Servlet initialization failed.  A graph cannot be generated.");
                 return;                  return;
             }               } 
   
             // Must generate a unique file name that the Dot consumer              // The temporary directory
             // will use              String tmpDir = m_SiRPACTmpDir;
   
             File f;              // Must generate a unique file name that the DOT consumer
             try {              // will use 
                  File d = new File(m_SiRPACTmpDir);              File dotFile = createTempFile(tmpDir, TMP_FILE_PREFIX, DOT_SUFFIX);
                  f = File.createTempFile("sirpac_", ".dot", d);              if (dotFile == null) {
             } catch (Exception e) {                  out.println("Failed to create a temporary DOT file. A graph cannot be generated.");
                 out.println("Failed to create a temporary file. A graph cannot be generated (" + e.getMessage() + ").");  
                 return;                  return;
             }              }
   
             // Create a PrintWriter for the GraphViz consumer              // Create a PrintWriter for the GraphViz consumer
             FileWriter fw = new FileWriter(f);              FileWriter fw = new FileWriter(dotFile);
             PrintWriter pw = new PrintWriter(fw);              PrintWriter pw = new PrintWriter(fw);
   
             // Run the parser using the DOT consumer to capture              // Run the parser using the DOT consumer to capture
Line 125  public class SiRPACServlet extends HttpS Line 168  public class SiRPACServlet extends HttpS
             } catch (Exception e) {              } catch (Exception e) {
                 out.println("An attempt to generate the graph data failed ("                  out.println("An attempt to generate the graph data failed ("
                             + e.getMessage() + ").");                              + e.getMessage() + ").");
                   pw.close();
                   dotFile.delete();
                 return;                  return;
             }              }
   
             // Pass the DOT data file to the GraphViz dot program              // Must close the DOT input file so the GraphViz can
             // to create the GIF file              // open and read it
             String dotFileName = f.getAbsolutePath();  
   
             // Close the file  
             pw.close();              pw.close();
   
             // @@ Delete the DOT file              // Must generate a unique file name for the GIF file
               // that will be created
               File gifFile = createTempFile(tmpDir, TMP_FILE_PREFIX, GIF_SUFFIX);
               if (gifFile == null) {
                   out.println("Failed to create a temporary GIF file. A graph cannot be generated.");
                   dotFile.delete();
                   return;
               }
   
               // Pass the DOT data file to the GraphViz dot program
               // so it can create a GIF image of the data model
               String dotFileName = dotFile.getAbsolutePath();
               String gifFileName = gifFile.getAbsolutePath();
   
               if (!generateGifFile(dotFileName, gifFileName)) {
                   out.println("An attempt to create a graph failed.");
                   dotFile.delete();
                   gifFile.delete();
                   return;
               }
   
               // @@ Cleanup
   //            dotFile.delete();
   
               // @@ Delete the GIF file
   
            // @@ Delete the GIF file              String imagePath = HttpUtils.getRequestURL(req).toString() +
                                  TMP_DIR_SUFFIX + File.separator + gifFile.getName();
   
 out.println("<img src=\"http://localhost:8001/servlet/SiRPAC.tmp/1.gif\"/>");              if (gifFile.length() > 0)
                   out.println("<img src=\"" + imagePath + "\"/>");
               else
                   out.println("The graph image file is empty.");
   
         } catch (Exception e) {          } catch (Exception e) {
             System.err.println("Exception: " + e.getMessage());              System.err.println("Exception: " + e.getMessage());
Line 151  out.println("<img src=\"http://localhost Line 220  out.println("<img src=\"http://localhost
      * Search the given string for substring "key"       * Search the given string for substring "key"
      * and if it is found, replace it with string "replacement"       * and if it is found, replace it with string "replacement"
      *       *
        *@param input the input string
        *@param key the string to search for
        *@param replacement the string to replace all occurences of "key"
      *@return if no substitutions are done, input is returned; otherwise        *@return if no substitutions are done, input is returned; otherwise 
      * a new string is returned.       * a new string is returned.
      */       */
Line 322  out.println("<img src=\"http://localhost Line 394  out.println("<img src=\"http://localhost
     }      }
   
     /*      /*
      * Servlet's doGet info method       * Servlet's doGet info method - NOT supported
      *       *
      *@param req the request       *@param req the request
      *@param res the response       *@param res the response
Removed from v.1.3  
changed lines
  Added in v.1.4

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