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1   /*
2    * Copyright (c) 2003, Henri Yandell
3    * All rights reserved.
4    * 
5    * Redistribution and use in source and binary forms, with or 
6    * without modification, are permitted provided that the 
7    * following conditions are met:
8    * 
9    * + Redistributions of source code must retain the above copyright notice, 
10   *   this list of conditions and the following disclaimer.
11   * 
12   * + Redistributions in binary form must reproduce the above copyright notice, 
13   *   this list of conditions and the following disclaimer in the documentation 
14   *   and/or other materials provided with the distribution.
15   * 
16   * + Neither the name of Genjava-Core nor the names of its contributors 
17   *   may be used to endorse or promote products derived from this software 
18   *   without specific prior written permission.
19   * 
20   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
21   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
22   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
23   * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
24   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
26   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
27   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
28   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
29   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
30   * POSSIBILITY OF SUCH DAMAGE.
31   */
32  package com.generationjava.util;
33  
34  import java.io.File;
35  import java.io.FileInputStream;
36  import java.io.FileNotFoundException;
37  import java.io.InputStream;
38  import java.io.IOException;
39  import java.net.URL;
40  import java.util.Properties;
41  
42  /***
43   * Find a Properties object from somewhere.
44   */
45  public class PropertiesLoader {
46  
47      private Properties properties = null;
48  
49      /***
50       * Uses a java.util.Properties object to load properties into.
51       */
52      public PropertiesLoader() {
53          this(new Properties());
54      }
55  
56      /***
57       * Use the passed in properties object if need be.
58       */
59      public PropertiesLoader(Properties properties) {
60          this.properties = properties;
61      }
62  
63      /***
64       * Find a properties with the given filename.
65       */
66      public Properties findProperties(String filename) {
67          Properties props;
68  
69          // use FileW.loadClasspathFile ???
70          ClassLoader loader = this.getClass().getClassLoader();
71  
72          if(loader == null) {
73              loader = ClassLoader.getSystemClassLoader();
74          }
75  
76          if(loader != null) {
77              URL url = loader.getResource(filename);
78              if(url == null) {
79                  url = loader.getResource("/"+filename);
80              }
81              if(url != null) {
82                  try {
83                      InputStream in = url.openStream();
84                      props = (Properties)this.properties.clone();
85                      props.load(in);
86                      return props;
87                  } catch(IOException ioe) {
88                  }
89              }
90          }
91  
92          props = loadProperties(filename);
93          if(props != null) {
94              return props;
95          }
96  
97          props = loadProperties(System.getProperty("properties.path"), filename);
98          if(props != null) {
99              return props;
100         }
101 
102         props = loadProperties(System.getProperty("user.dir"),filename);
103         if(props != null) {
104             return props;
105         }
106 
107         props = loadProperties(System.getProperty("user.home"), filename);
108         return props;
109     }
110 
111     /***
112      * Load a Properties file with the given directory and filename.
113      */
114     public Properties loadProperties(String directory, String filename) {
115         return loadProperties(directory + File.separatorChar + filename);
116     }
117 
118     /***
119      * Load a Properties file with the given pathname.
120      */
121     public Properties loadProperties(String pathname) {
122         try {
123             Properties loadedProperties = (Properties)this.properties.clone();
124             FileInputStream fis = new FileInputStream(pathname);
125             loadedProperties.load(fis);
126             fis.close();
127             return loadedProperties;
128         } catch(FileNotFoundException fnfe) {
129             return null;
130         } catch(IOException fnfe) {
131             return null;
132         }
133     }
134 
135 }