ICUData


1   /*
2    *******************************************************************************
3    * Copyright (C) 2004-2005, International Business Machines Corporation and         *
4    * others. All Rights Reserved.                                                *
5    *******************************************************************************
6    *
7    * Created on Feb 4, 2004
8    *
9    */
10  package com.ibm.icu.impl;
11  
12  import java.io.InputStream  ;
13  import java.net.URL  ;
14  import java.security.AccessController  ;
15  import java.security.PrivilegedAction  ;
16  import java.util.MissingResourceException  ;
17  
18  /**
19   * Provides access to ICU data files as InputStreams.  Implements security checking.
20   */
21  public final class ICUData {
22      /*
23       * Return a URL to the ICU resource names resourceName.  The
24       * resource name should either be an absolute path, or a path relative to
25       * com.ibm.icu.impl (e.g., most likely it is 'data/foo').  If required
26       * is true, throw an MissingResourceException instead of returning a null result.
27       */
28      public static boolean exists(final String   resourceName) {
29          URL   i = null;
30          if (System.getSecurityManager() != null) {
31              i = (URL  )AccessController.doPrivileged(new PrivilegedAction  () {
32                      public Object   run() {
33                          return ICUData.class.getResource(resourceName);
34                      }
35                  });
36          } else {
37              i = ICUData.class.getResource(resourceName);
38          }
39          return i != null;
40      }
41          
42      private static InputStream   getStream(final Class   root, final String   resourceName, boolean required) {
43          InputStream   i = null;
44          
45          if (System.getSecurityManager() != null) {
46              i = (InputStream  )AccessController.doPrivileged(new PrivilegedAction  () {
47                      public Object   run() {
48                          return root.getResourceAsStream(resourceName);
49                      }
50                  });
51          } else {
52              i = root.getResourceAsStream(resourceName);
53          }
54  
55          if (i == null && required) {
56              throw new MissingResourceException  ("could not locate data " +resourceName, root.getPackage().getName(), resourceName);
57          }
58          return i;
59      }
60  
61      private static InputStream   getStream(final ClassLoader   loader, final String   resourceName, boolean required) {
62          InputStream   i = null;
63          if (System.getSecurityManager() != null) {
64              i = (InputStream  )AccessController.doPrivileged(new PrivilegedAction  () {
65                      public Object   run() {
66                          return loader.getResourceAsStream(resourceName);
67                      }
68                  });
69          } else {
70              i = loader.getResourceAsStream(resourceName);
71          }
72          if (i == null && required) {
73              throw new MissingResourceException  ("could not locate data", loader.toString(), resourceName);
74          }
75          return i;
76      }
77      
78      public static InputStream   getStream(ClassLoader   loader, String   resourceName){
79          return getStream(loader,resourceName, false);   
80      }
81  
82      public static InputStream   getRequiredStream(ClassLoader   loader, String   resourceName){
83          return getStream(loader,resourceName, true);   
84      }
85  
86      /*
87       * Convenience override that calls getStream(ICUData.class, resourceName, false);
88       */
89      public static InputStream   getStream(String   resourceName) {
90          return getStream(ICUData.class, resourceName, false);
91      }
92          
93      /*
94       * Convenience method that calls getStream(ICUData.class, resourceName, true).
95       */
96      public static InputStream   getRequiredStream(String   resourceName) {
97          return getStream(ICUData.class, resourceName, true);
98      }
99  
100     /*
101      * Convenience override that calls getStream(root, resourceName, false);
102      */
103     public static InputStream   getStream(Class   root, String   resourceName) {
104         return getStream(root, resourceName, false);
105     }
106         
107     /*
108      * Convenience method that calls getStream(root, resourceName, true).
109      */
110     public static InputStream   getRequiredStream(Class   root, String   resourceName) {
111         return getStream(root, resourceName, true);
112     }
113 }
114 
115
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags