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Java > Open Source Codes > org > jruby > environment > OSEnvironmentReaderFromFile


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2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
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4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
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10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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14  * Copyright (C) 2006 Tim Azzopardi <tim@tigerfive.com>
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28
29 package org.jruby.environment;
30
31 import java.io.BufferedReader JavaDoc;
32 import java.io.File JavaDoc;
33 import java.io.FileNotFoundException JavaDoc;
34 import java.io.FileReader JavaDoc;
35 import java.util.Map JavaDoc;
36
37 import org.jruby.Ruby;
38
39
40 /**
41  * Get the os environment from a file.
42  * Requires a java system property "jruby.envfile" to give the location of a file from which
43  * the environment variables can be loaded.
44  *
45  */
46 class OSEnvironmentReaderFromFile implements IOSEnvironmentReader {
47
48     private static final String JavaDoc JRUBY_ENVFILE = "jruby.envfile";
49
50     private final OSEnvironment environmentReader = new OSEnvironment();
51     
52     
53     /* (non-Javadoc)
54      * @see org.jruby.IOSEnvironment#isAccessible()
55      */
56     public boolean isAccessible(Ruby runtime) {
57         String JavaDoc jrubyEnvFilename = System.getProperty(JRUBY_ENVFILE);
58
59         if (jrubyEnvFilename == null || jrubyEnvFilename.length() < 1) {
60             return false;
61         }
62         
63         File JavaDoc jrubyEnvFile = new File JavaDoc(jrubyEnvFilename);
64         
65         return (jrubyEnvFile.exists() && !jrubyEnvFile.isDirectory() && jrubyEnvFile.canRead());
66     }
67     
68     /* (non-Javadoc)
69      * @see org.jruby.IOSEnvironment#getVariables()
70      */
71     public Map JavaDoc getVariables(Ruby runtime) {
72         String JavaDoc jrubyEnvFilename = System.getProperty(JRUBY_ENVFILE);
73
74         Map JavaDoc envs = null;
75         
76         if (jrubyEnvFilename == null || jrubyEnvFilename.length() < 1) {
77             environmentReader.handleException(new OSEnvironmentReaderExcepton("Property " + JRUBY_ENVFILE + " not defined."));
78         } else {
79             BufferedReader JavaDoc reader = null;
80             try {
81                 reader = new BufferedReader JavaDoc(new FileReader JavaDoc(jrubyEnvFilename));
82             } catch (FileNotFoundException JavaDoc e) {
83                 envs = null;
84                 // Very unlikely to happen as isAccessible() should be used first
85 environmentReader.handleException(e);
86             }
87             envs = environmentReader.getVariablesFrom(reader);
88         }
89         return envs;
90     }
91 }
92
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