Relocated common io helper from com.*.util.io -> com.*.impl.io

git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/branches/JOGL_2_SANDBOX@1766 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 106 insertions, 0 deletions

diff --git a/src/classes/com/sun/opengl/impl/io/Locator.java b/src/classes/com/sun/opengl/impl/io/Locator.java
new file mode 100644
index 000000000..863829960
--- /dev/null
+++ b/src/classes/com/sun/opengl/impl/io/Locator.java
@@ -0,0 +1,106 @@
+package com.sun.opengl.impl.io;
+
+import javax.media.opengl.util.*;
+
+import java.util.*;
+import java.nio.*;
+import java.io.*;
+import java.net.*;
+
+/** Utilities for dealing with streams. */
+
+public class Locator {
+    private Locator() {}
+
+    /**
+     * Locates the resource using 'getResource(String path, ClassLoader cl)',
+     * with this context ClassLoader and the path as is,
+     * as well with the context's package name path plus the path.
+     *
+     * @see #getResource(String, ClassLoader)
+     */
+    public static URL getResource(Class context, String path) {
+        ClassLoader contextCL = (null!=context)?context.getClassLoader():null;
+        URL url = getResource(path, contextCL);
+        if (url == null && null!=context) {
+            // Try again by scoping the path within the class's package
+            String className = context.getName().replace('.', '/');
+            int lastSlash = className.lastIndexOf('/');
+            if (lastSlash >= 0) {
+                String tmpPath = className.substring(0, lastSlash + 1) + path;
+                url = getResource(tmpPath, contextCL);
+            }
+        }
+        return url;
+    }
+
+    /**
+     * Locates the resource using the ClassLoader's facility,
+     * the absolute URL and absolute file.
+     *
+     * @see ClassLoader#getResource(String)
+     * @see ClassLoader#getSystemResource(String)
+     * @see URL#URL(String)
+     * @see File#File(String)
+     */
+    public static URL getResource(String path, ClassLoader cl) {
+        URL url = null;
+        if (cl != null) {
+            url = cl.getResource(path);
+        } else {
+            url = ClassLoader.getSystemResource(path);
+        }
+        if(!urlExists(url)) {
+            url = null;
+            try {
+                url = new URL(path);
+            } catch (MalformedURLException e) { }
+        }
+        if(!urlExists(url)) {
+            url = null;
+            try {
+                File file = new File(path);
+                if(file.exists()) {
+                    url = file.toURL();
+                }
+            } catch (MalformedURLException e) {}
+        }
+        return url;
+    }
+
+    /**
+     * Generates a path for the 'relativeFile' relative to the 'absoluteFileLocation'
+     */
+    public static String getRelativeOf(String absoluteFileLocation, String relativeFile) {
+        File file = new File(absoluteFileLocation);
+        file = file.getParentFile();
+        while (file != null && relativeFile.startsWith("../")) {
+            file = file.getParentFile();
+            relativeFile = relativeFile.substring(3);
+        }
+        if (file != null) {
+            String res = new File(file, relativeFile).getPath();
+	        // Handle things on Windows
+            return res.replace('\\', '/');
+        } else {
+            return relativeFile;
+        }
+    }
+
+    /**
+     * Returns true, if the url exists,
+     * trying to open a connection.
+     */
+    public static boolean urlExists(URL url) {
+        boolean v = false;
+        if(null!=url) {
+            try {
+                URLConnection uc = url.openConnection();
+                v = true;
+            } catch (IOException ioe) { }
+        }
+        return v;
+    }
+
+}
+