FileResolverImpl.java revision 608:7e06bf1dcb09 
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
26package com.sun.corba.se.impl.resolver ;
27
28import org.omg.CORBA.ORBPackage.InvalidName;
29
30import com.sun.corba.se.spi.resolver.Resolver ;
31
32import java.util.Enumeration;
33import java.util.Properties;
34import java.util.Set;
35import java.util.HashSet;
36
37import java.io.File;
38import java.io.FileInputStream;
39
40import com.sun.corba.se.spi.orb.ORB ;
41
42import com.sun.corba.se.impl.orbutil.CorbaResourceUtil ;
43
44public 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}
111