Add 'asset' URLConnection; IOUtil uses URLConnection / incr. effeciency; Android ClassLoaderUtil cleanup;

- Add 'asset' URLConnection
  - Please read API doc 'PiggybackURLConnection' and 'AssetURLConnection'

  - Solves generic resource handling where platform locations may differ,
    ie ClassLoader lookup on Android in the 'assets/' subfolder.

  - New Android 'AssetDexClassLoader' uses 'assets/' folder for findResource(..)

  - aapt.signed (our APK ant task)
    - uses 'assets/' folder

    - adds the 'assetsdir' attribute allowing to copy other assets into the APK

- IOUtil uses URLConnection / incr. effeciency
  - using URLConnection on all getResource(..) since URL
    is connected anyways for validation and URLConnection can be used by caller right away

  - String getRelativeOf(URL, String) -> URL getRelativeOf(URL, String)
    - preserves scheme, authority, etc
    - simple parentOf handling, more efficient

  - reusing new 'asset' protocol impl.

- Android ClassLoaderUtil cleanup;
  - Use createClassLoader(..) impl for build-in static jogamp and user APKs,
    which removes code redundancy

Tests: New code path, especially 'assets' are covered by new unit tests, no regressions on Linux.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/java/com/jogamp/common/net/PiggybackURLContext.java b/src/java/com/jogamp/common/net/PiggybackURLContext.java
new file mode 100644
index 0000000..2cb48b5
--- /dev/null
+++ b/src/java/com/jogamp/common/net/PiggybackURLContext.java
@@ -0,0 +1,18 @@
+package com.jogamp.common.net;
+
+import java.io.IOException;
+import java.net.URLConnection;
+
+/**
+ * See {@link PiggybackURLConnection} for description and examples.
+ */
+public interface PiggybackURLContext {
+
+    /** Returns the specific protocol, constant for this implementation. */    
+    public String getImplementedProtocol();
+    
+    /** 
+     * Resolving path to a URL sub protocol and return it's open URLConnection 
+     **/
+    public URLConnection resolve(String path) throws IOException;    
+}