The R Project SVN – R – Diff – /branches/R-conn/doc/html/search/SearchEngine.java

   Project: Simple JAVA Search Engine for Keyword Search
   JAVA Source file for the class SearchEngine
   COPYRIGHT (C), 1998, Thomas Baier
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
-  ALL RIGHTS RESERVED.
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   $Source: /scratch/CVS-ARCHIVE/R/doc/html/search/SearchEngine.java,v $
-  $Revision: 1.1 $
+  $Revision: 1.2 $
-  $Date: 1998/05/15 10:38:10 $
+  $Date: 1999/03/04 17:15:18 $
   $Author: leisch $
 ==============================================================================*/
   CONF. TO:
   PURPOSE:
   NOTES:
   HISTORY:  98-04-26: created
+-05-15: new member for search mode
 ------------------------------------------------------------------------------*/
 public class SearchEngine extends Applet
+{
   /*============================================================================
                                 Public methods
     THROWS:
     RETURNS:   void
     HISTORY:   98-04-26: created
 -05-03: now reads the index file
+-05-15: init new member
   ----------------------------------------------------------------------------*/
   public SearchEngine ()
+  {
     iIndexTable = null;
     iSearchTerm = null;
+    iSearchMode = 0;
     Tracer.write ("SearchEngine initializing\n");
     return;
+  }
     HISTORY:   98-05-03: created
 -05-08: new format for output
 -05-09: added trace
 -05-10: now a front-end for search()
+-05-15: new parameter for search-mode
   ----------------------------------------------------------------------------*/
-  public String search (String key)
+  public String search (String key,boolean searchTitles)
+  {
     iSearchTerm = key;
+    if (searchTitles) {
+      iSearchMode = IndexTable.cSearchDescription;
+    } else {
+      iSearchMode = 0;
+    }
     return internalSearch ();
+  }
   /*----------------------------------------------------------------------------
     PARAMS:
     THROWS:
     RETURNS:   void
     HISTORY:   98-05-10: created
+-05-15: forward search-mode
   ----------------------------------------------------------------------------*/
   public String internalSearch ()
+  {
     Tracer.write ("Search for \"" + iSearchTerm + "\" started");
     Vector foundItems = null;
     if (iSearchTerm != null) {
-      foundItems = iIndexTable.search (iSearchTerm);
+      foundItems = iIndexTable.search (iSearchTerm,iSearchMode);
     } else {
       foundItems = null;
+    }
     String result = null;
       Enumeration cursor = foundItems.elements ();
       result =
 	"The search string was <b>\"" +
 	iSearchTerm +
-	"<b>\"" +
+	"</b>\"" +
 	"<hr>" +
 	"<dl>";
       while (cursor.hasMoreElements ()) {
 	IndexEntry entry = (IndexEntry) cursor.nextElement ();
     RETURNS:   void
     HISTORY:   98-04-26: created
 -05-08: now use an IndexStream
 -05-10: also use prefix and suffix, build URL from first key
+-05-19: add "Alias:" entry to keywords
+-06-01: bugfix: don't null the variables
   ----------------------------------------------------------------------------*/
   private void readIndexFile (String idxFile)
+  {
     // create the index table
     iIndexTable = new IndexTable ();
        * An entry consists of a title, keywords, an URL and a description.
        * everything else is ignored. Every entry starts with the keyword
        * "Entry" (case is ignored)
+       *
        * must-have entries are "Entry" and "Keywords"
+       *
+       * 98-06-01: bugfix: don't null the variables
        */
-      String entry = null;
+      String entry = "";
-      String keywords = null;
+      String keywords = "";
-      String url = null;
+      String url = "";
       String description = "";
       String prefix = "";
       String suffix = "";
       Value value = idxStream.popEntry ();
 	if (value.getKey ().equalsIgnoreCase ("entry")) {
 	  // if a new entry is about to start, add the current one
 	  addEntry (entry,keywords,description,url,prefix,suffix);
 	  entry = value.getValue ();
-	  keywords = null;
+	  keywords = "";
-	  url = null;
+	  url = "";
 	  description = "";
 	} else if (value.getKey ().equalsIgnoreCase ("keywords")) {
-	  keywords = value.getValue ();
+	  keywords += value.getValue ();
 	} else if (value.getKey ().equalsIgnoreCase ("url")) {
 	  // use prefix and suffix
 	  url = prefix + value.getValue () + suffix;
 	} else if (value.getKey ().equalsIgnoreCase ("description")) {
 	  description = value.getValue ();
 	  prefix = value.getValue ();
 	  Tracer.write ("using new URL prefix \"" + prefix + "\"\n");
 	} else if (value.getKey ().equalsIgnoreCase ("suffix")) {
 	  suffix = value.getValue ();
 	  Tracer.write ("using new URL suffix \"" + suffix + "\"\n");
+	} else if (value.getKey ().equalsIgnoreCase ("alias")) {
+	  keywords += value.getValue ();
+	}
 	value = idxStream.popEntry ();
+      }
       // the final entry just read
     PARAMS:
     THROWS:
     RETURNS:   void
     HISTORY:   98-05-10: created
+-06-01: value is "", not null if empty
   ----------------------------------------------------------------------------*/
   private void addEntry (String entry,String keywords,
 			 String description,String url,
 			 String prefix,String suffix)
+  {
     // the entry must be set
-    if (entry == null) {
+    if (entry.length () == 0) {
       return;
+    }
     // the keywords must be set, else ignore it
-    if (keywords != null) {
+    if (keywords.length () != 0) {
-      if (url == null) {
+      if (url.length () == 0) {
 	// if the URL is empty, construct one following the rule:
 	// URL = prefix + first keyword + suffix
 	int endOfFirstKeyword = keywords.indexOf (" ");
 	// because we have trimmed the string, the first character must
   /*============================================================================
                              Instance Variables
   ============================================================================*/
   private IndexTable iIndexTable;
   private String     iSearchTerm;
+  private int        iSearchMode;
   /*============================================================================
                                 Static Data
   ============================================================================*/
 /*==============================================================================
   HISTORY:
   $Log: SearchEngine.java,v $
-  Revision 1.1  1998/05/15 10:38:10  leisch
+  Revision 1.2  1999/03/04 17:15:18  leisch
-  New: Search Engine
+  various bugfixes
+  Revision 1.1.4.1  1999/03/02 15:19:57  leisch
+  search used only kewords, no titles
+  Revision 1.6  1998/05/19 20:23:13  baier
+  added alias support
+  Revision 1.5  1998/05/15 22:10:05  baier
+  allow searching in description, fix bug in results list
   Revision 1.4  1998/05/10 22:56:53  baier
   internal search function, parameter expansion
   Revision 1.3  1998/05/10 02:44:32  baier

The R Project SVN R

(root)/branches/R-conn/doc/html/search/SearchEngine.java @ 28362 – Rev 1230 → 3765