1 /*
   2  * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.corba.se.impl.resolver ;
  27 
  28 import org.omg.CORBA.ORBPackage.InvalidName;
  29 
  30 import com.sun.corba.se.spi.resolver.Resolver ;
  31 
  32 import java.util.Enumeration;
  33 import java.util.Properties;
  34 import java.util.Set;
  35 import java.util.HashSet;
  36 
  37 import java.io.File;
  38 import java.io.FileInputStream;
  39 
  40 import com.sun.corba.se.spi.orb.ORB ;
  41 
  42 import com.sun.corba.se.impl.orbutil.CorbaResourceUtil ;
  43 
  44 public class FileResolverImpl implements Resolver
  45 {
  46     private ORB orb ;
  47     private File file ;
  48     private Properties savedProps ;
  49     private long fileModified = 0 ;
  50 
  51     public FileResolverImpl( ORB orb, File file )
  52     {
  53         this.orb = orb ;
  54         this.file = file ;
  55         savedProps = new Properties() ;
  56     }
  57 
  58     public org.omg.CORBA.Object resolve( String name )
  59     {
  60         check() ;
  61         String stringifiedObject = savedProps.getProperty( name ) ;
  62         if (stringifiedObject == null) {
  63             return null;
  64         }
  65         return orb.string_to_object( stringifiedObject ) ;
  66     }
  67 
  68     public java.util.Set list()
  69     {
  70         check() ;
  71 
  72         Set result = new HashSet() ;
  73 
  74         // Obtain all the keys from the property object
  75         Enumeration theKeys = savedProps.propertyNames();
  76         while (theKeys.hasMoreElements()) {
  77             result.add( theKeys.nextElement() ) ;
  78         }
  79 
  80         return result ;
  81     }
  82 
  83     /**
  84     * Checks the lastModified() timestamp of the file and optionally
  85     * re-reads the Properties object from the file if newer.
  86     */
  87     private void check()
  88     {
  89         if (file == null)
  90             return;
  91 
  92         long lastMod = file.lastModified();
  93         if (lastMod > fileModified) {
  94             try {
  95                 FileInputStream fileIS = new FileInputStream(file);
  96                 savedProps.clear();
  97                 savedProps.load(fileIS);
  98                 fileIS.close();
  99                 fileModified = lastMod;
 100             } catch (java.io.FileNotFoundException e) {
 101                 System.err.println( CorbaResourceUtil.getText(
 102                     "bootstrap.filenotfound", file.getAbsolutePath()));
 103             } catch (java.io.IOException e) {
 104                 System.err.println( CorbaResourceUtil.getText(
 105                     "bootstrap.exception",
 106                     file.getAbsolutePath(), e.toString()));
 107             }
 108         }
 109     }
 110 }