Added a file remotely

git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/joglutils/trunk@86 83d24430-9974-4f80-8418-2cc3294053b9

1 files changed, 109 insertions, 0 deletions

diff --git a/src/net/java/joglutils/model/ResourceRetriever.java b/src/net/java/joglutils/model/ResourceRetriever.java
new file mode 100644
index 0000000..3b81190
--- /dev/null
+++ b/src/net/java/joglutils/model/ResourceRetriever.java
@@ -0,0 +1,109 @@
+package net.java.joglutils.model;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.MalformedURLException;
+
+/**
+ * Utility class that allows transparent reading of files from the current 
+ * working directory or from the classpath.
+ * <p>
+ * Based on code from author Pepijn Van Eeckhoudt
+ */
+public class ResourceRetriever {
+
+    /**
+     * Retrieves a resource as a URL that corresponds to the file specified
+     * by the passed in filename.
+     * 
+     * @param filename The name of the file to retrieve as a URL
+     * @throws IOException
+     * @return URL that corresponds to the filename
+     */
+    public static URL getResource( final String filename ) throws IOException {
+        // Try to load resource from jar
+        URL url = ResourceRetriever.class.getClassLoader().getResource(filename);
+        
+        // If not found in jar, then load from disk
+        if (url == null) {
+            return new URL("file", "localhost", filename);
+        } else {
+            return url;
+        }
+    }
+
+    /**
+     * Retrieves a resource as an InputStream that corresponds to the file 
+     * specified by the passed in filename.
+     * 
+     * @param filename The name of the file to retrieve as an InputStream
+     * @throws IOException
+     * @return InputStream that corresponds to the filename     
+     */    
+    public static InputStream getResourceAsStream( final String filename ) throws IOException {
+        // Try to load resource from jar
+        String convertedFileName = filename.replace('\\', '/');
+        InputStream stream = ResourceRetriever.class.getClassLoader().getResourceAsStream(convertedFileName);
+        // If not found in jar, then load from disk
+        if (stream == null) {
+            return new FileInputStream(convertedFileName);
+        } else {
+            return stream;
+        }
+    }
+    
+    /**
+     * Retrieves a resource as a URL that corresponds to the file specified
+     * by the passed in filename.
+     * 
+     * @param filename The name of the file to retrieve as a URL
+     * @throws IOException
+     * @return URL that corresponds to the filename
+     */    
+    public static URL getResourceAsUrl( final String filename ) throws IOException {
+        URL result;
+        
+        try {
+            result = new URL(filename);
+        } catch (MalformedURLException e) {     
+            // When the string was not a valid URL, try to load it as a resource using
+            // an anonymous class in the tree.
+            Object objectpart = new Object() { };
+            Class classpart = objectpart.getClass();
+            ClassLoader loaderpart = classpart.getClassLoader();
+            result = loaderpart.getResource(filename);
+            
+            if (result == null) {
+                result = new URL("file", "localhost", filename);
+            }
+        }    
+        
+        return result;
+    }
+    
+    /**
+     * Retrieves a resource as an InputStream that corresponds to the file 
+     * specified by the passed in filename.
+     * 
+     * @param filename The name of the file to retrieve as an InputStream
+     * @throws IOException
+     * @return InputStream that corresponds to the filename     
+     */      
+    public static InputStream getResourceAsInputStream( final String filename ) throws IOException {        
+        URL result;
+        
+        try {
+            result = getResourceAsUrl(filename);                                  
+        } catch(IOException e) {
+            return new FileInputStream(filename);    
+        }
+        
+        if (result == null) {
+            return new FileInputStream(filename);
+        } else {
+            return result.openStream();
+        }        
+    }
+}
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