From e3d391b71f59528bd657f6a731c9250ea1d14334 Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Tue, 6 Nov 2001 18:34:48 +0000
Subject: [PATCH] 1) New syntax: methods add, reload and remove can now process
 multiple    entries with just one method invocation. NO BACKWARD
 COMPATIBILITY RETAINED. 2) Serialization and deserialization: when
 serialization is enabled, every    time a stylesheet is recompiled it is also
 serialized on disk. When    booting, UWOBO automatically reloads every
 serialized stylesheet. 3) More verbosity: every method gives back to the user
 and writes in the log    much more information than before. 4) Methods update
 and updateAll (whose semantic was unclear) definitely removed.

---
 helm/uwobo/build.xml                          |   4 +-
 .../src/it/unibo/cs/helm/uwobo/Server.java    | 211 +++++++++++++-----
 .../src/it/unibo/cs/helm/uwobo/Servlet.java   |  90 ++++----
 .../src/it/unibo/cs/helm/uwobo/properties.txt |   1 +
 4 files changed, 199 insertions(+), 107 deletions(-)

diff --git a/helm/uwobo/build.xml b/helm/uwobo/build.xml
index de9d59a87..abdcdc858 100644
--- a/helm/uwobo/build.xml
+++ b/helm/uwobo/build.xml
@@ -4,7 +4,8 @@
 
 	<property name="Name" value="Uwobo"/>
 	<property name="name" value="uwobo"/>
-	<property name="version" value="1.1.14beta"/>
+	<property name="version" value="1.2"/>
+	<property name="serialization_dir" value=""/>
 
 	<property file=".${name}.properties" />
 	<property file="${user.home}/.${name}.properties" />
@@ -63,6 +64,7 @@
 		<filter token="VERSION" value="${version}" />
 		<filter token="DATE" value="${TODAY}" />
 		<filter token="TIME" value="${TSTAMP}" />
+                <filter token="SERIALIZATION_DIR" value="${serialization_dir}" />
 		<copy todir="${build.dir}" overwrite="true" filtering="on">
 			<fileset dir="${src.dir}">
 				<include name="**/properties.txt" />
diff --git a/helm/uwobo/src/it/unibo/cs/helm/uwobo/Server.java b/helm/uwobo/src/it/unibo/cs/helm/uwobo/Server.java
index cd2f2fa30..9b33b6629 100644
--- a/helm/uwobo/src/it/unibo/cs/helm/uwobo/Server.java
+++ b/helm/uwobo/src/it/unibo/cs/helm/uwobo/Server.java
@@ -37,7 +37,7 @@ import org.xml.sax.helpers.*;
 */
 
 public class Server {
-	private static class Style {
+	private static class Style implements Serializable {
 		public String fileName;
 		public long lastModified;
 		public Templates stylesheet;
@@ -48,6 +48,7 @@ public class Server {
 	public static final String VERSION;
 	public static final String DATE;
 	public static final String TIME;
+	public static final String SERIALIZATION_DIR;
 
 	static {
 		Properties props = new Properties();
@@ -63,17 +64,71 @@ public class Server {
 		VERSION = props.getProperty("VERSION");
 		DATE = props.getProperty("DATE");
 		TIME = props.getProperty("TIME");
+                SERIALIZATION_DIR = props.getProperty("SERIALIZATION_DIR");
 	}
 
+        Server() {
+           if(!SERIALIZATION_DIR.equals("")) {
+              log("Looking for serialized stylesheets");
+              File [] serialized = new File(SERIALIZATION_DIR).listFiles();
+              if (serialized == null) {
+                 log("Serialized stylesheets directory \"" + SERIALIZATION_DIR +
+                  "\" not found");
+              } else {
+                 for (int i = 0; i < serialized.length ; i++) {
+                    File filename = serialized[i];
+                    String key = filename.getName();
+                    log("Found serialized stylesheet " + key);
+                    log("Reloading serialized stylesheet \"" + filename + "\"... ");
+                    FileInputStream istream;
+                    try {
+                       istream = new FileInputStream(filename);
+                       ObjectInputStream p = new ObjectInputStream(istream);
+                       Style style = (Style)p.readObject();
+                       istream.close();
+                       hashMap.put(key, style);
+                    } catch (Exception e) {log(e.toString());};
+                 }
+                 log("Serialized stylesheets loaded!");
+              }
+           } else
+              log("Stylesheet serialization is off. Set the property SERIALIZATION_DIR to a non-empty value to turn it on.");
+          
+        }
+
 	private final HashMap hashMap = new HashMap();
 	private static int logCounter = 0;
 	
-	private final Templates compileStylesheet(String xsl_file) throws TransformerConfigurationException, SAXException, IOException {
+	private final String compileStylesheet(Style style, String key) throws TransformerConfigurationException, SAXException, IOException {
 		StreamSource streamsource =
-			new StreamSource(new URL(xsl_file).openStream());
-		streamsource.setSystemId(xsl_file);
-		return ((SAXTransformerFactory)TransformerFactory.newInstance())
-			.newTemplates(streamsource);
+			new StreamSource(new URL(style.fileName).openStream());
+		streamsource.setSystemId(style.fileName);
+                Templates templates =
+                   ((SAXTransformerFactory)TransformerFactory.newInstance())
+                      .newTemplates(streamsource);
+                style.stylesheet = templates;
+                File serializationFile = new File(SERIALIZATION_DIR,key);
+                String res = "";
+                if(!SERIALIZATION_DIR.equals("")) {
+                   try {
+                      FileOutputStream ostream =
+                         new FileOutputStream(serializationFile);
+                      ObjectOutputStream p = new ObjectOutputStream(ostream);
+                      p.writeObject(style);
+                      p.flush();
+                      ostream.close();
+                      res =
+                       "Stylesheet serialized in \"" + serializationFile + "\"";
+		      log(res);
+                   } catch (FileNotFoundException e) {
+                      res = "Warning: Stylesheet not " +
+                         "serialized. Error opening " + "file \"" +
+                         serializationFile + "\"";
+		      log(res);
+                      res = htmlOfWarning(res);
+                   }
+                }
+                return res;
 	}
 
 	private String getContentType(Templates templates) {
@@ -136,43 +191,81 @@ public class Server {
 		System.err.println(SERVERNAME + "[" + logCounter++ + "]: " + msg);
 	}
 
-	public void add(String filename, String key) throws TransformerConfigurationException, SAXException, IOException {
+	public String add(String filename, String key) throws TransformerConfigurationException, SAXException, IOException {
+		log("processing stylesheet \"" + filename + "\" using key " + key + "... ");
 		if (hashMap.containsKey(key)) {
-			log("there is already a stylesheet with keyword \"" + key + "\" (aborted)");
-			return;
+                   Style style = (Style)hashMap.get(key);
+                   if (style.fileName.equals(filename)) {
+                      String msg =
+                         "Warning: Stylesheet already loaded. Reloading...";
+                      log(msg);
+                      String msg2 = reload(key);
+                      return htmlOfWarning(msg) +
+                         (msg2.equals("") ? "" : "<br />" + msg2);
+                   } else {
+                      String res =
+                         "Error: There is already a stylesheet with keyword \""+
+                          key + "\" (aborted)";
+                      log(res);
+                      return htmlOfError(res);
+                   }
 		}
 
 		Style style = new Style();
 		style.fileName = filename;
 		style.lastModified = new File(filename).lastModified();
-		log("processing stylesheet \"" + filename + "\"... ");
-		style.stylesheet = compileStylesheet(filename);
-		log("done!");
+		String res = compileStylesheet(style,key);
+                log("done!");
 
 		hashMap.put(key, style);
+                return res;
 	}
 
-	public void removeAll() 
-        {
-		String key;
-		Style style;
+	public ArrayList removeAll() throws TransformerConfigurationException, SAXException, IOException {
+                ArrayList res = new ArrayList();
+                String log = "";
 		Iterator i = hashMap.keySet().iterator();
 		while (i.hasNext()) {
-			key = (String)i.next();
-			style = (Style)hashMap.get(key);
-			log("removing \"" + key + " (" + style.fileName + ")");
-		}
-		hashMap.clear();
+                        String key = (String)i.next();
+			Style style = (Style)hashMap.get(key);
+                        String msg =
+                         "removing \"" + key + " (" + style.fileName + ")";
+                        res.add(msg);
+                        log(msg);
+                        msg = partialRemove(key,false);
+                        if(!msg.equals(""))
+                           res.add(msg);
+                }
+                hashMap.clear();
+                return res;
 	}
 
-	public void remove(String key) {
+	private String partialRemove(String key, boolean removeFromHashTable) {
+                String res = "";
 		Style style = (Style)hashMap.get(key);
 		if (style != null) {
 			log("removing \"" + key + " (" + style.fileName + ")");
-			hashMap.remove(key);
+			if (removeFromHashTable)
+                           hashMap.remove(key);
+                        if(!SERIALIZATION_DIR.equals("")) {
+                           File to_delete = new File(SERIALIZATION_DIR,key);
+                           if (!to_delete.delete()) {
+                              res = "Warning: Serialized stylesheet \"" +
+                                 to_delete + "\" to remove not found";
+                              log(res);
+                              res = htmlOfWarning(res);
+                           }
+                        }
 		} else {
-			log("error, stylesheet \"" + key + "\" not loaded");
+			res = "Error: stylesheet \"" + key + "\" not loaded";
+                        log(res);
+                        res = htmlOfError(res);
 		}
+                return res;
+	}
+
+	public String remove(String key) {
+           return partialRemove(key,true);
 	}
 
 	public String getContentType(String key) {
@@ -180,7 +273,7 @@ public class Server {
 		if (style != null) {
 			return getContentType(style.stylesheet);
 		} else {
-			log("error, stylesheet \"" + key + "\" not loaded");
+			log("Error, stylesheet \"" + key + "\" not loaded");
 			return null;
 		}
 	}
@@ -213,7 +306,7 @@ public class Server {
 			return applyStylesheet(style.stylesheet, keys[idx].params, applyRec(keys, idx - 1, saxOutput));
 		}
 	}
-//FileNotFoundException
+
 	public void apply(String inFile, OutputStream outputStream, Key[] keys, Properties userProperties)
 	throws IOException, TransformerConfigurationException, SAXException, Exception
 	{
@@ -233,7 +326,7 @@ public class Server {
 			if (keys.length > 0) {
 				Style style = (Style) hashMap.get(rkeys[0].name);
 				if (style == null) {
-					log("error, stylesheet \"" + rkeys[0].name + "\" not loaded");
+					log("Error, stylesheet \"" + rkeys[0].name + "\" not loaded");
 					return;
 				}
 				outputProperties = style.stylesheet.getOutputProperties();
@@ -266,44 +359,46 @@ public class Server {
 //		}
 	}
 
-	public void reloadAll() throws TransformerConfigurationException, SAXException, IOException {
+	public ArrayList reloadAll() throws TransformerConfigurationException, SAXException, IOException {
+                ArrayList res = new ArrayList();
 		Iterator i = hashMap.keySet().iterator();
-		while (i.hasNext())
-			reload((String)i.next());
+		while (i.hasNext()) {
+                        String key = (String)i.next();
+			Style style = (Style)hashMap.get(key);
+                        String msg =
+                         "reloading \"" + key + " (" + style.fileName + ")";
+                        res.add(msg);
+                        log(msg);
+                        msg = reload(key);
+                        if(!msg.equals(""))
+                           res.add(msg);
+                }
+                return res;
 	}
 
-	public void reload(String key) throws TransformerConfigurationException, SAXException, IOException {
+	public String reload(String key) throws TransformerConfigurationException, SAXException, IOException {
+                String res = "";
 		Style style = (Style)hashMap.get(key);
-                if (style != null) {
-			log("reloading \"" + key + "\"... ");
-			style.stylesheet = compileStylesheet(style.fileName);
-			style.lastModified = new File(style.fileName).lastModified();
-			log("done!");
+		if (style != null) {
+		   log("reloading \"" + key + "\"... ");
+		   style.lastModified = new File(style.fileName).lastModified();
+                   res= compileStylesheet(style,key);
+                   log("done!");
 		} else {
-			log("error, stylesheet \"" + key + "\" not loaded");
+			res = "Error: stylesheet \"" + key + "\" not loaded";
+                        log(res);
+                        res = htmlOfError(res);
 		}
+                return res;
 	}
 
-	public void updateAll() throws TransformerConfigurationException, SAXException, IOException {
-		Iterator i = hashMap.keySet().iterator();
-		while (i.hasNext())
-			update((String)i.next());
-	}
+        private String htmlOfWarning(String message)
+        {
+           return "<b style=\"color: maroon\">" + message+"</b>";
+        }
 
-	public void update(String key) throws TransformerConfigurationException, SAXException, IOException {
-		Style style = (Style)hashMap.get(key);
-                if (style != null) {
-			log("updating \"" + key + "\"... ");
-			File styleFile = new File(style.fileName);
-			if (styleFile.lastModified() > style.lastModified) {
-				style.stylesheet = compileStylesheet(style.fileName);
-				style.lastModified = styleFile.lastModified();
-				log("done!");
-			} else {
-				log("\"" + key + "\" is up to date");
-			}
-		} else {
-			log("error, stylesheet \"" + key + "\" not loaded");
-		}
-	}
+        private String htmlOfError(String message)
+        {
+           return "<b style=\"color: red\">" + message+"</b>";
+        }
 }
diff --git a/helm/uwobo/src/it/unibo/cs/helm/uwobo/Servlet.java b/helm/uwobo/src/it/unibo/cs/helm/uwobo/Servlet.java
index 3b4766250..7158bc646 100644
--- a/helm/uwobo/src/it/unibo/cs/helm/uwobo/Servlet.java
+++ b/helm/uwobo/src/it/unibo/cs/helm/uwobo/Servlet.java
@@ -7,24 +7,24 @@ import javax.servlet.http.*;
 import javax.xml.transform.*;
 import org.xml.sax.*;
 
+// WARNING: next comment is obsolete!!!!!
 /*
 *
 * usage:
-*   http://aristotele/helm/servlet/uwobo/help
-*   http://aristotele/helm/servlet/uwobo/add?xsluri=&key=
-*   http://aristotele/helm/servlet/uwobo/remove[?key=]
-*   http://aristotele/helm/servlet/uwobo/list
-*   http://aristotele/helm/servlet/uwobo/reload[?key=]
-*   http://aristotele/helm/servlet/uwobo/update[?key=]
-*   http://aristotele/helm/servlet/uwobo/apply?xmluri=&keys=[&param.=]*
+*   http://hostname/helm/servlet/uwobo/help
+*   http://hostname/helm/servlet/uwobo/add?bind=key,stylesheet[&bind=key,stylesheet]*
+*   http://hostname/helm/servlet/uwobo/remove[?keys=key_1,...,key_n]
+*   http://hostname/helm/servlet/uwobo/list
+*   http://hostname/helm/servlet/uwobo/reload[?keys=key_1,...,key_n]
+*   http://hostname/helm/servlet/uwobo/apply?xmluri=xmldata&keys=key_1,...,key_n[&param.name=value]*[&param.key.name=value]*[&prop.name=[value]]*
 *
 * example:
-*   http://aristotele/helm/servlet/uwobo/add?xsluri=file:///D:/Archivio/Progetti/helm/resources/xsl/foo1.xsl&key=foo1
-*   http://aristotele/helm/servlet/uwobo/add?xsluri=file:///D:/Archivio/Progetti/helm/resources/xsl/foo2.xsl&key=foo2
-*   http://aristotele/helm/servlet/uwobo/apply?xmluri=file:///D:/Archivio/Progetti/helm/resources/xsl/foo.xml&key=foo1&key=foo2
+*   http://aristotele/helm/servlet/uwobo/add?bind=foo1,file:///D:/Archivio/Progetti/helm/resources/xsl/foo1.xsl
+*   http://aristotele/helm/servlet/uwobo/add?bind=foo2,file:///D:/Archivio/Progetti/helm/resources/xsl/foo2.xsl
+*   http://aristotele/helm/servlet/uwobo/apply?xmluri=file:///D:/Archivio/Progetti/helm/resources/xsl/foo.xml&keys=foo1,foo2
 *
 * installation notes (Tomcat):
-*	replace parser.jar and jaxp.jar from /lib with xerces.jar
+*	replace parser.jar and jaxp.jar from /lib with xerces.jar and add xalan.jar
 *
 *	add in conf/server.xml
 *		<Context path="/helm" 
@@ -37,8 +37,6 @@ import org.xml.sax.*;
 *	add in uriworkermap.properties
 *		/helm/*=ajp12
 *
-* bugs:
-*	directory base stylesheet inclusi
 *
 * @author The HELM team
 */
@@ -46,11 +44,10 @@ public class Servlet extends HttpServlet {
    
    public static final String[] usage = {
       "http://<i>hostname</i>/helm/servlet/uwobo/help",
-      "http://<i>hostname</i>/helm/servlet/uwobo/add?key=<i>key</i>,<i>stylesheet</i>[&key=<i>key</i>,<i>stylesheet</i>]*",
+      "http://<i>hostname</i>/helm/servlet/uwobo/add?bind=<i>key</i>,<i>stylesheet</i>[&bind=<i>key</i>,<i>stylesheet</i>]*",
       "http://<i>hostname</i>/helm/servlet/uwobo/remove[?keys=<i>key_1,...,key_n</i>]",
       "http://<i>hostname</i>/helm/servlet/uwobo/list",
       "http://<i>hostname</i>/helm/servlet/uwobo/reload[?keys=<i>key_1,...,key_n</i>]",
-      "http://<i>hostname</i>/helm/servlet/uwobo/update[?keys=<i>key_1,...,key_n</i>]",
       "http://<i>hostname</i>/helm/servlet/uwobo/apply?xmluri=<i>xmldata</i>&keys=<i>key_1,...,key_n</i>[&param.<i>name</i>=<i>value</i>]*[&param.<i>key</i>.<i>name</i>=<i>value</i>]*[&prop.<i>name</i>=[<i>value</i>]]*"
    };
    public static final String help;
@@ -97,7 +94,7 @@ public class Servlet extends HttpServlet {
    throws IOException
    {  
       resp.setContentType("text/html");
-      out.println("<html><body bgcolor=\"#ffffff\"><h1>Uwobo servlet</h1>");
+      out.println("<html><body bgcolor=\"#ffffff\"><h1>" + server.PACKAGE + " servlet</h1>");
    }
    
    private void html_close(ServletOutputStream out)
@@ -109,7 +106,7 @@ public class Servlet extends HttpServlet {
 
    private String msg_out(String message)
    {
-      return message+"<br>";
+      return message+"<br />";
    }
    
    private String exc_out(String message, Exception e)
@@ -121,13 +118,14 @@ public class Servlet extends HttpServlet {
       }
       String local = e.getLocalizedMessage();
       local = local.substring(local.lastIndexOf(':')+1);
-      return "<b>"+message+": "+local+"</b><br>";
+      return "<b>"+message+": "+local+"</b><br />";
    }
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException
    {
       ServletOutputStream out = response.getOutputStream();
+      String log = "";
       
       response.setHeader("Cache-Control", "no-cache");
       response.setHeader("Pragma", "no-cache");
@@ -140,16 +138,18 @@ public class Servlet extends HttpServlet {
 	    sendError(response, out, "unknown command", help); return;
 	 } 
 	 if (cmd.equals("/add")) {
-	    final String[] xslkey = request.getParameterValues("key");
+	    final String[] xslkey = request.getParameterValues("bind");
 	    if (xslkey == null) {
 	       sendError(response, out, "bad parameters", usage[1]); return;
 	    } 
 	    html_open(response, out);
 	    for (int i = 0; i < xslkey.length; i++) {
 	       final String data[] = split2(xslkey[i], ",");
-	       out.println(msg_out("adding key "+data[0]+" ("+data[1]+")"));
+	       out.println(msg_out("adding stylesheet "+data[0]+" ("+data[1]+")"));
 	       try {
-	          server.add(data[1], data[0]);
+	          log = server.add(data[1], data[0]);
+                  if(!log.equals(""))
+                     out.println(msg_out(log));
 	        } catch (TransformerConfigurationException tce) {
                   out.println(exc_out("stylesheet error", tce));
                } catch (Exception e) {
@@ -236,10 +236,14 @@ public class Servlet extends HttpServlet {
 	    for (int i = 0; i < data.length; i++) { 
 	       if (data[i] == null) {
 	          out.println(msg_out("removing all keys"));
-		  server.removeAll();
+                  ArrayList res;
+		  res = server.removeAll();
+                  Iterator j = res.iterator();
+                  while (j.hasNext())
+                     out.println(msg_out((String)j.next()));
 	       } else {
 	          out.println(msg_out("removing key "+data[i]));
-		  server.remove(data[i]);
+		  out.println(msg_out(server.remove(data[i])));
 	       }
 	    }
 	    html_close(out); return;
@@ -261,31 +265,14 @@ public class Servlet extends HttpServlet {
 	       try {
 	          if (data[i] == null) {
 	             out.println(msg_out("reloading all keys"));
-		     server.reloadAll();
+                     ArrayList res;
+		     res = server.reloadAll();
+                     Iterator j = res.iterator();
+                     while(j.hasNext())
+                        out.println(msg_out((String)j.next()));
 	          } else {
 	             out.println(msg_out("reloading key "+data[i]));
-		     server.reload(data[i]);
-	          }
-	       } catch (TransformerConfigurationException tce) {
-                  out.println(exc_out("stylesheet error", tce));
-               } catch (Exception e) {
-	          out.println(exc_out(null, e));
-               }
-	    }
-	    html_close(out); return;
-	 }
-         if (cmd.equals("/update")) {
-	    final String key = request.getParameter("keys");
-            final String [] data = split(key, ",");
-	    html_open(response, out);
-	    for (int i = 0; i < data.length; i++) {
-	       try {
-	          if (data[i] == null) {
-	             out.println(msg_out("updating all keys")); 
-		     server.updateAll();
-	          } else {
-	             out.println(msg_out("updating key "+data[i]));
-		     server.update(data[i]);
+		     out.println(msg_out(server.reload(data[i])));
 	          }
 	       } catch (TransformerConfigurationException tce) {
                   out.println(exc_out("stylesheet error", tce));
@@ -297,14 +284,21 @@ public class Servlet extends HttpServlet {
 	 }
 	 if (cmd.equals("/help")) {
 	    html_open(response, out);
-	    out.println("<h2>"+server.PACKAGE+" servlet - version "+server.VERSION+"</h1>");
+	    out.println("<h2>Version "+server.VERSION+"</h1>");
 	    out.println("<b>compiled "+server.DATE+" at "+server.TIME.substring(0,2)+":"+server.TIME.substring(2)+"</b>");
+            if(Server.SERIALIZATION_DIR.equals("")) {
+               out.println("<p><b>Stylesheet serialization is off.</b>");
+               out.println("(To turn it on, choose a non-empty value for the " +
+                  "SERIALIZATION_DIR property.)</p>");
+            } else
+               out.println("<p><b>Serialized stylesheed are stored in &quot;" +
+                  Server.SERIALIZATION_DIR + "&quot;.</b></p>");
 	    out.println("<p>usage:</p>"+help+"</body></html>");
 	    html_close(out); return;
 	 }
 	 sendError(response, out, "unknown command", help); return;
       } catch (Exception e) {
-	 sendError(response, out, exc_out(null, e),""); // FG: non dovrebbe servire mai
+	 sendError(response, out, exc_out(null, e),"");
 	 return;
       }
    }
diff --git a/helm/uwobo/src/it/unibo/cs/helm/uwobo/properties.txt b/helm/uwobo/src/it/unibo/cs/helm/uwobo/properties.txt
index eb2861132..debd51773 100644
--- a/helm/uwobo/src/it/unibo/cs/helm/uwobo/properties.txt
+++ b/helm/uwobo/src/it/unibo/cs/helm/uwobo/properties.txt
@@ -2,3 +2,4 @@ PACKAGE=@PACKAGE@
 VERSION=@VERSION@
 DATE=@DATE@
 TIME=@TIME@
+SERIALIZATION_DIR=@SERIALIZATION_DIR@
-- 
2.39.2