1 files changed, 113 insertions, 0 deletions
diff --git a/src/com/ibm/icu/impl/ICUData.java b/src/com/ibm/icu/impl/ICUData.java
new file mode 100644
index 0000000..b47b278
--- /dev/null
+++ b/src/com/ibm/icu/impl/ICUData.java
@@ -0,0 +1,113 @@
+/*
+ *******************************************************************************
+ * Copyright (C) 2004-2009, International Business Machines Corporation and    *
+ * others. All Rights Reserved.                                                *
+ *******************************************************************************
+ *
+ * Created on Feb 4, 2004
+ *
+ */
+package com.ibm.icu.impl;
+
+import java.io.InputStream;
+import java.net.URL;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.MissingResourceException;
+
+/**
+ * Provides access to ICU data files as InputStreams.  Implements security checking.
+ */
+public final class ICUData {
+    /*
+     * Return a URL to the ICU resource names resourceName.  The
+     * resource name should either be an absolute path, or a path relative to
+     * com.ibm.icu.impl (e.g., most likely it is 'data/foo').  If required
+     * is true, throw an MissingResourceException instead of returning a null result.
+     */
+    public static boolean exists(final String resourceName) {
+        URL i = null;
+        if (System.getSecurityManager() != null) {
+            i = AccessController.doPrivileged(new PrivilegedAction<URL>() {
+                    public URL run() {
+                        return ICUData.class.getResource(resourceName);
+                    }
+                });
+        } else {
+            i = ICUData.class.getResource(resourceName);
+        }
+        return i != null;
+    }
+        
+    private static InputStream getStream(final Class<?> root, final String resourceName, boolean required) {
+        InputStream i = null;
+        
+        if (System.getSecurityManager() != null) {
+            i = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {
+                    public InputStream run() {
+                        return root.getResourceAsStream(resourceName);
+                    }
+                });
+        } else {
+            i = root.getResourceAsStream(resourceName);
+        }
+
+        if (i == null && required) {
+            throw new MissingResourceException("could not locate data " +resourceName, root.getPackage().getName(), resourceName);
+        }
+        return i;
+    }
+
+    private static InputStream getStream(final ClassLoader loader, final String resourceName, boolean required) {
+        InputStream i = null;
+        if (System.getSecurityManager() != null) {
+            i = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {
+                    public InputStream run() {
+                        return loader.getResourceAsStream(resourceName);
+                    }
+                });
+        } else {
+            i = loader.getResourceAsStream(resourceName);
+        }
+        if (i == null && required) {
+            throw new MissingResourceException("could not locate data", loader.toString(), resourceName);
+        }
+        return i;
+    }
+    
+    public static InputStream getStream(ClassLoader loader, String resourceName){
+        return getStream(loader,resourceName, false);   
+    }
+
+    public static InputStream getRequiredStream(ClassLoader loader, String resourceName){
+        return getStream(loader, resourceName, true);
+    }
+
+    /*
+     * Convenience override that calls getStream(ICUData.class, resourceName, false);
+     */
+    public static InputStream getStream(String resourceName) {
+        return getStream(ICUData.class, resourceName, false);
+    }
+        
+    /*
+     * Convenience method that calls getStream(ICUData.class, resourceName, true).
+     */
+    public static InputStream getRequiredStream(String resourceName) {
+        return getStream(ICUData.class, resourceName, true);
+    }
+
+    /*
+     * Convenience override that calls getStream(root, resourceName, false);
+     */
+    public static InputStream getStream(Class<?> root, String resourceName) {
+        return getStream(root, resourceName, false);
+    }
+    
+    /*
+     * Convenience method that calls getStream(root, resourceName, true).
+     */
+    public static InputStream getRequiredStream(Class<?> root, String resourceName) {
+        return getStream(root, resourceName, true);
+    }
+}