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, 13 insertions, 15 deletions

diff --git a/src/junit/com/jogamp/common/util/TestIOUtil01.java b/src/junit/com/jogamp/common/util/TestIOUtil01.java
index 47fa1e9..b75127c 100644
--- a/src/junit/com/jogamp/common/util/TestIOUtil01.java
+++ b/src/junit/com/jogamp/common/util/TestIOUtil01.java
@@ -35,13 +35,11 @@ import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.net.URL;
+import java.net.URLConnection;
 import java.nio.ByteBuffer;
 
 import org.junit.Assert;
-import org.junit.Before;
 import org.junit.BeforeClass;
-import org.junit.AfterClass;
 import org.junit.Test;
 
 import com.jogamp.common.os.MachineDescription;
@@ -69,9 +67,9 @@ public class TestIOUtil01 extends JunitTracer {
     
     @Test
     public void testCopyStream01Array() throws IOException {
-        URL url = IOUtil.getResource(this.getClass(), tfilename);
-        Assert.assertNotNull(url);
-        final BufferedInputStream bis = new BufferedInputStream( url.openStream() );
+        URLConnection urlConn = IOUtil.getResource(this.getClass(), tfilename);
+        Assert.assertNotNull(urlConn);
+        final BufferedInputStream bis = new BufferedInputStream( urlConn.getInputStream() );
         final byte[] bb;
         try {
             bb = IOUtil.copyStream2ByteArray( bis );
@@ -85,9 +83,9 @@ public class TestIOUtil01 extends JunitTracer {
 
     @Test
     public void testCopyStream02Buffer() throws IOException {
-        URL url = IOUtil.getResource(this.getClass(), tfilename);
-        Assert.assertNotNull(url);
-        final BufferedInputStream bis = new BufferedInputStream( url.openStream() );
+        URLConnection urlConn = IOUtil.getResource(this.getClass(), tfilename);
+        Assert.assertNotNull(urlConn);
+        final BufferedInputStream bis = new BufferedInputStream( urlConn.getInputStream() );
         final ByteBuffer bb;
         try {
             bb = IOUtil.copyStream2ByteBuffer( bis ); 
@@ -103,15 +101,15 @@ public class TestIOUtil01 extends JunitTracer {
     @Test
     public void testCopyStream03Buffer() throws IOException {
         final String tfilename2 = "./test2.bin" ;
-        URL url1 = IOUtil.getResource(this.getClass(), tfilename);
-        Assert.assertNotNull(url1);
+        URLConnection urlConn1 = IOUtil.getResource(this.getClass(), tfilename);
+        Assert.assertNotNull(urlConn1);
         
         File file2 = new File(tfilename2);
-        IOUtil.copyURL2File(url1, file2);
-        URL url2 = IOUtil.getResource(this.getClass(), tfilename2);
-        Assert.assertNotNull(url2);
+        IOUtil.copyURLConn2File(urlConn1, file2);
+        URLConnection urlConn2 = IOUtil.getResource(this.getClass(), tfilename2);
+        Assert.assertNotNull(urlConn2);
 
-        final BufferedInputStream bis = new BufferedInputStream( url2.openStream() );
+        final BufferedInputStream bis = new BufferedInputStream( urlConn2.getInputStream() );
         final ByteBuffer bb;
         try {
             bb = IOUtil.copyStream2ByteBuffer( bis );