Let DefaultUriDataSource load assets.

demo/src/main/java/com/google/android/exoplayer/demo/PlayerActivity.java

@@ -233,19 +233,19 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
             audioCapabilities);
             audioCapabilities);
       case DemoUtil.TYPE_M4A: // There are no file format differences between M4A and MP4.
       case DemoUtil.TYPE_M4A: // There are no file format differences between M4A and MP4.
       case DemoUtil.TYPE_MP4:
       case DemoUtil.TYPE_MP4:
-        return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
+        return new ExtractorRendererBuilder(this, userAgent, contentUri, debugTextView,
             new Mp4Extractor());
             new Mp4Extractor());
       case DemoUtil.TYPE_MP3:
       case DemoUtil.TYPE_MP3:
-        return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
+        return new ExtractorRendererBuilder(this, userAgent, contentUri, debugTextView,
             new Mp3Extractor());
             new Mp3Extractor());
       case DemoUtil.TYPE_TS:
       case DemoUtil.TYPE_TS:
-        return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
+        return new ExtractorRendererBuilder(this, userAgent, contentUri, debugTextView,
             new TsExtractor(0, audioCapabilities));
             new TsExtractor(0, audioCapabilities));
       case DemoUtil.TYPE_AAC:
       case DemoUtil.TYPE_AAC:
-        return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
+        return new ExtractorRendererBuilder(this, userAgent, contentUri, debugTextView,
             new AdtsExtractor());
             new AdtsExtractor());
       case DemoUtil.TYPE_WEBM:
       case DemoUtil.TYPE_WEBM:
-        return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
+        return new ExtractorRendererBuilder(this, userAgent, contentUri, debugTextView,
             new WebmExtractor());
             new WebmExtractor());
       default:
       default:
         throw new IllegalStateException("Unsupported type: " + contentType);
         throw new IllegalStateException("Unsupported type: " + contentType);

demo/src/main/java/com/google/android/exoplayer/demo/player/DashRendererBuilder.java

@@ -130,7 +130,7 @@ public class DashRendererBuilder implements RendererBuilder,
     this.player = player;
     this.player = player;
     this.callback = callback;
     this.callback = callback;
     MediaPresentationDescriptionParser parser = new MediaPresentationDescriptionParser();
     MediaPresentationDescriptionParser parser = new MediaPresentationDescriptionParser();
-    manifestDataSource = new DefaultUriDataSource(userAgent, null);
+    manifestDataSource = new DefaultUriDataSource(context, userAgent);
     manifestFetcher = new ManifestFetcher<MediaPresentationDescription>(url, manifestDataSource,
     manifestFetcher = new ManifestFetcher<MediaPresentationDescription>(url, manifestDataSource,
         parser);
         parser);
     manifestFetcher.singleLoad(player.getMainHandler().getLooper(), this);
     manifestFetcher.singleLoad(player.getMainHandler().getLooper(), this);
@@ -232,10 +232,10 @@ public class DashRendererBuilder implements RendererBuilder,
       videoRenderer = null;
       videoRenderer = null;
       debugRenderer = null;
       debugRenderer = null;
     } else {
     } else {
-      DataSource videoDataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
-      ChunkSource videoChunkSource = new DashChunkSource(manifestFetcher, videoAdaptationSetIndex,
-          videoRepresentationIndices, videoDataSource, new AdaptiveEvaluator(bandwidthMeter),
-          LIVE_EDGE_LATENCY_MS, elapsedRealtimeOffset);
+      DataSource videoDataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
+      ChunkSource videoChunkSource = new DashChunkSource(manifestFetcher,
+          videoAdaptationSetIndex, videoRepresentationIndices, videoDataSource,
+          new AdaptiveEvaluator(bandwidthMeter), LIVE_EDGE_LATENCY_MS, elapsedRealtimeOffset);
       ChunkSampleSource videoSampleSource = new ChunkSampleSource(videoChunkSource, loadControl,
       ChunkSampleSource videoSampleSource = new ChunkSampleSource(videoChunkSource, loadControl,
           VIDEO_BUFFER_SEGMENTS * BUFFER_SEGMENT_SIZE, true, mainHandler, player,
           VIDEO_BUFFER_SEGMENTS * BUFFER_SEGMENT_SIZE, true, mainHandler, player,
           DemoPlayer.TYPE_VIDEO);
           DemoPlayer.TYPE_VIDEO);
@@ -249,7 +249,7 @@ public class DashRendererBuilder implements RendererBuilder,
     List<ChunkSource> audioChunkSourceList = new ArrayList<ChunkSource>();
     List<ChunkSource> audioChunkSourceList = new ArrayList<ChunkSource>();
     List<String> audioTrackNameList = new ArrayList<String>();
     List<String> audioTrackNameList = new ArrayList<String>();
     if (audioAdaptationSet != null) {
     if (audioAdaptationSet != null) {
-      DataSource audioDataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
+      DataSource audioDataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
       FormatEvaluator audioEvaluator = new FormatEvaluator.FixedEvaluator();
       FormatEvaluator audioEvaluator = new FormatEvaluator.FixedEvaluator();
       List<Representation> audioRepresentations = audioAdaptationSet.representations;
       List<Representation> audioRepresentations = audioAdaptationSet.representations;
       List<String> codecs = new ArrayList<String>();
       List<String> codecs = new ArrayList<String>();
@@ -304,7 +304,7 @@ public class DashRendererBuilder implements RendererBuilder,
     }
     }
 
 
     // Build the text chunk sources.
     // Build the text chunk sources.
-    DataSource textDataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
+    DataSource textDataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
     FormatEvaluator textEvaluator = new FormatEvaluator.FixedEvaluator();
     FormatEvaluator textEvaluator = new FormatEvaluator.FixedEvaluator();
     List<ChunkSource> textChunkSourceList = new ArrayList<ChunkSource>();
     List<ChunkSource> textChunkSourceList = new ArrayList<ChunkSource>();
     List<String> textTrackNameList = new ArrayList<String>();
     List<String> textTrackNameList = new ArrayList<String>();

demo/src/main/java/com/google/android/exoplayer/demo/player/ExtractorRendererBuilder.java

@@ -25,6 +25,7 @@ import com.google.android.exoplayer.extractor.ExtractorSampleSource;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DefaultUriDataSource;
 import com.google.android.exoplayer.upstream.DefaultUriDataSource;
 
 
+import android.content.Context;
 import android.media.MediaCodec;
 import android.media.MediaCodec;
 import android.net.Uri;
 import android.net.Uri;
 import android.widget.TextView;
 import android.widget.TextView;
@@ -36,13 +37,15 @@ public class ExtractorRendererBuilder implements RendererBuilder {
 
 
   private static final int BUFFER_SIZE = 10 * 1024 * 1024;
   private static final int BUFFER_SIZE = 10 * 1024 * 1024;
 
 
+  private final Context context;
   private final String userAgent;
   private final String userAgent;
   private final Uri uri;
   private final Uri uri;
   private final TextView debugTextView;
   private final TextView debugTextView;
   private final Extractor extractor;
   private final Extractor extractor;
 
 
-  public ExtractorRendererBuilder(String userAgent, Uri uri, TextView debugTextView,
-      Extractor extractor) {
+  public ExtractorRendererBuilder(Context context, String userAgent, Uri uri,
+      TextView debugTextView, Extractor extractor) {
+    this.context = context;
     this.userAgent = userAgent;
     this.userAgent = userAgent;
     this.uri = uri;
     this.uri = uri;
     this.debugTextView = debugTextView;
     this.debugTextView = debugTextView;
@@ -52,7 +55,7 @@ public class ExtractorRendererBuilder implements RendererBuilder {
   @Override
   @Override
   public void buildRenderers(DemoPlayer player, RendererBuilderCallback callback) {
   public void buildRenderers(DemoPlayer player, RendererBuilderCallback callback) {
     // Build the video and audio renderers.
     // Build the video and audio renderers.
-    DataSource dataSource = new DefaultUriDataSource(userAgent, null);
+    DataSource dataSource = new DefaultUriDataSource(context, userAgent);
     ExtractorSampleSource sampleSource = new ExtractorSampleSource(uri, dataSource, extractor, 2,
     ExtractorSampleSource sampleSource = new ExtractorSampleSource(uri, dataSource, extractor, 2,
         BUFFER_SIZE);
         BUFFER_SIZE);
     MediaCodecVideoTrackRenderer videoRenderer = new MediaCodecVideoTrackRenderer(sampleSource,
     MediaCodecVideoTrackRenderer videoRenderer = new MediaCodecVideoTrackRenderer(sampleSource,

demo/src/main/java/com/google/android/exoplayer/demo/player/HlsRendererBuilder.java

@@ -76,8 +76,8 @@ public class HlsRendererBuilder implements RendererBuilder, ManifestCallback<Hls
     this.player = player;
     this.player = player;
     this.callback = callback;
     this.callback = callback;
     HlsPlaylistParser parser = new HlsPlaylistParser();
     HlsPlaylistParser parser = new HlsPlaylistParser();
-    ManifestFetcher<HlsPlaylist> playlistFetcher =
-        new ManifestFetcher<HlsPlaylist>(url, new DefaultUriDataSource(userAgent, null), parser);
+    ManifestFetcher<HlsPlaylist> playlistFetcher = new ManifestFetcher<HlsPlaylist>(url,
+        new DefaultUriDataSource(context, userAgent), parser);
     playlistFetcher.singleLoad(player.getMainHandler().getLooper(), this);
     playlistFetcher.singleLoad(player.getMainHandler().getLooper(), this);
   }
   }
 
 
@@ -103,7 +103,7 @@ public class HlsRendererBuilder implements RendererBuilder, ManifestCallback<Hls
       }
       }
     }
     }
 
 
-    DataSource dataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
+    DataSource dataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
     HlsChunkSource chunkSource = new HlsChunkSource(dataSource, url, manifest, bandwidthMeter,
     HlsChunkSource chunkSource = new HlsChunkSource(dataSource, url, manifest, bandwidthMeter,
         variantIndices, HlsChunkSource.ADAPTIVE_MODE_SPLICE, audioCapabilities);
         variantIndices, HlsChunkSource.ADAPTIVE_MODE_SPLICE, audioCapabilities);
     HlsSampleSource sampleSource = new HlsSampleSource(chunkSource, true, 3, REQUESTED_BUFFER_SIZE,
     HlsSampleSource sampleSource = new HlsSampleSource(chunkSource, true, 3, REQUESTED_BUFFER_SIZE,

demo/src/main/java/com/google/android/exoplayer/demo/player/SmoothStreamingRendererBuilder.java

@@ -160,7 +160,7 @@ public class SmoothStreamingRendererBuilder implements RendererBuilder,
       videoRenderer = null;
       videoRenderer = null;
       debugRenderer = null;
       debugRenderer = null;
     } else {
     } else {
-      DataSource videoDataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
+      DataSource videoDataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
       ChunkSource videoChunkSource = new SmoothStreamingChunkSource(manifestFetcher,
       ChunkSource videoChunkSource = new SmoothStreamingChunkSource(manifestFetcher,
           videoStreamElementIndex, videoTrackIndices, videoDataSource,
           videoStreamElementIndex, videoTrackIndices, videoDataSource,
           new AdaptiveEvaluator(bandwidthMeter), LIVE_EDGE_LATENCY_MS);
           new AdaptiveEvaluator(bandwidthMeter), LIVE_EDGE_LATENCY_MS);
@@ -184,7 +184,7 @@ public class SmoothStreamingRendererBuilder implements RendererBuilder,
     } else {
     } else {
       audioTrackNames = new String[audioStreamElementCount];
       audioTrackNames = new String[audioStreamElementCount];
       ChunkSource[] audioChunkSources = new ChunkSource[audioStreamElementCount];
       ChunkSource[] audioChunkSources = new ChunkSource[audioStreamElementCount];
-      DataSource audioDataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
+      DataSource audioDataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
       FormatEvaluator audioFormatEvaluator = new FormatEvaluator.FixedEvaluator();
       FormatEvaluator audioFormatEvaluator = new FormatEvaluator.FixedEvaluator();
       audioStreamElementCount = 0;
       audioStreamElementCount = 0;
       for (int i = 0; i < manifest.streamElements.length; i++) {
       for (int i = 0; i < manifest.streamElements.length; i++) {
@@ -215,7 +215,7 @@ public class SmoothStreamingRendererBuilder implements RendererBuilder,
     } else {
     } else {
       textTrackNames = new String[textStreamElementCount];
       textTrackNames = new String[textStreamElementCount];
       ChunkSource[] textChunkSources = new ChunkSource[textStreamElementCount];
       ChunkSource[] textChunkSources = new ChunkSource[textStreamElementCount];
-      DataSource ttmlDataSource = new DefaultUriDataSource(userAgent, bandwidthMeter);
+      DataSource ttmlDataSource = new DefaultUriDataSource(context, bandwidthMeter, userAgent);
       FormatEvaluator ttmlFormatEvaluator = new FormatEvaluator.FixedEvaluator();
       FormatEvaluator ttmlFormatEvaluator = new FormatEvaluator.FixedEvaluator();
       textStreamElementCount = 0;
       textStreamElementCount = 0;
       for (int i = 0; i < manifest.streamElements.length; i++) {
       for (int i = 0; i < manifest.streamElements.length; i++) {

library/src/main/java/com/google/android/exoplayer/upstream/AssetDataSource.java

@@ -18,6 +18,7 @@ package com.google.android.exoplayer.upstream;
 import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.util.Assertions;
 import com.google.android.exoplayer.util.Assertions;
 
 
+import android.content.Context;
 import android.content.res.AssetManager;
 import android.content.res.AssetManager;
 
 
 import java.io.EOFException;
 import java.io.EOFException;
@@ -32,7 +33,7 @@ public final class AssetDataSource implements UriDataSource {
   /**
   /**
    * Thrown when IOException is encountered during local asset read operation.
    * Thrown when IOException is encountered during local asset read operation.
    */
    */
-  public static class AssetDataSourceException extends IOException {
+  public static final class AssetDataSourceException extends IOException {
 
 
     public AssetDataSourceException(IOException cause) {
     public AssetDataSourceException(IOException cause) {
       super(cause);
       super(cause);
@@ -51,8 +52,8 @@ public final class AssetDataSource implements UriDataSource {
   /**
   /**
    * Constructs a new {@link DataSource} that retrieves data from a local asset.
    * Constructs a new {@link DataSource} that retrieves data from a local asset.
    */
    */
-  public AssetDataSource(AssetManager assetManager) {
-    this(assetManager, null);
+  public AssetDataSource(Context context) {
+    this(context, null);
   }
   }
 
 
   /**
   /**
@@ -60,8 +61,8 @@ public final class AssetDataSource implements UriDataSource {
    *
    *
    * @param listener An optional listener. Specify {@code null} for no listener.
    * @param listener An optional listener. Specify {@code null} for no listener.
    */
    */
-  public AssetDataSource(AssetManager assetManager, TransferListener listener) {
-    this.assetManager = assetManager;
+  public AssetDataSource(Context context, TransferListener listener) {
+    this.assetManager = context.getAssets();
     this.listener = listener;
     this.listener = listener;
   }
   }
 
 

library/src/main/java/com/google/android/exoplayer/upstream/DefaultUriDataSource.java

@@ -17,17 +17,49 @@ package com.google.android.exoplayer.upstream;
 
 
 import com.google.android.exoplayer.util.Assertions;
 import com.google.android.exoplayer.util.Assertions;
 
 
+import android.content.Context;
+
 import java.io.IOException;
 import java.io.IOException;
 
 
 /**
 /**
- * A data source that fetches data from a local or remote {@link DataSpec}.
+ * A {@link UriDataSource} that supports multiple URI schemes. The supported schemes are:
+ *
+ * <ul>
+ * <li>http(s): For fetching data over HTTP and HTTPS (e.g. https://www.something.com/media.mp4).
+ * <li>file: For fetching data from a local file (e.g. file:///path/to/media/media.mp4).
+ * <li>asset: For fetching data from an asset in the application's apk (e.g. asset:///media.mp4).
+ * </ul>
  */
  */
 public final class DefaultUriDataSource implements UriDataSource {
 public final class DefaultUriDataSource implements UriDataSource {
 
 
-  private static final String FILE_URI_SCHEME = "file";
+  /**
+   * Thrown when a {@link DefaultUriDataSource} is opened for a URI with an unsupported scheme.
+   */
+  public static final class UnsupportedSchemeException extends IOException {
+
+    /**
+     * The unsupported scheme.
+     */
+    public final String scheme;
+
+    /**
+     * @param scheme The unsupported scheme.
+     */
+    public UnsupportedSchemeException(String scheme) {
+      super("Unsupported URI scheme: " + scheme);
+      this.scheme = scheme;
+    }
+
+  }
+
+  private static final String SCHEME_HTTP = "http";
+  private static final String SCHEME_HTTPS = "https";
+  private static final String SCHEME_FILE = "file";
+  private static final String SCHEME_ASSET = "asset";
 
 
-  private final UriDataSource fileDataSource;
   private final UriDataSource httpDataSource;
   private final UriDataSource httpDataSource;
+  private final UriDataSource fileDataSource;
+  private final UriDataSource assetDataSource;
 
 
   /**
   /**
    * {@code null} if no data source is open. Otherwise, equal to {@link #fileDataSource} if the open
    * {@code null} if no data source is open. Otherwise, equal to {@link #fileDataSource} if the open
@@ -36,54 +68,86 @@ public final class DefaultUriDataSource implements UriDataSource {
   private UriDataSource dataSource;
   private UriDataSource dataSource;
 
 
   /**
   /**
-   * Constructs a new data source that delegates to a {@link FileDataSource} for file URIs and a
-   * {@link DefaultHttpDataSource} for other URIs.
+   * Constructs a new instance.
    * <p>
    * <p>
    * The constructed instance will not follow cross-protocol redirects (i.e. redirects from HTTP to
    * The constructed instance will not follow cross-protocol redirects (i.e. redirects from HTTP to
    * HTTPS or vice versa) when fetching remote data. Cross-protocol redirects can be enabled by
    * HTTPS or vice versa) when fetching remote data. Cross-protocol redirects can be enabled by
-   * using the {@link #DefaultUriDataSource(String, TransferListener, boolean)} constructor and
-   * passing {@code true} as the final argument.
+   * using {@link #DefaultUriDataSource(Context, TransferListener, String, boolean)} and passing
+   * {@code true} as the final argument.
    *
    *
+   * @param context A context.
    * @param userAgent The User-Agent string that should be used when requesting remote data.
    * @param userAgent The User-Agent string that should be used when requesting remote data.
-   * @param transferListener An optional listener.
    */
    */
-  public DefaultUriDataSource(String userAgent, TransferListener transferListener) {
-    this(userAgent, transferListener, false);
+  public DefaultUriDataSource(Context context, String userAgent) {
+    this(context, null, userAgent, false);
   }
   }
 
 
   /**
   /**
-   * Constructs a new data source that delegates to a {@link FileDataSource} for file URIs and a
-   * {@link DefaultHttpDataSource} for other URIs.
+   * Constructs a new instance.
+   * <p>
+   * The constructed instance will not follow cross-protocol redirects (i.e. redirects from HTTP to
+   * HTTPS or vice versa) when fetching remote data. Cross-protocol redirects can be enabled by
+   * using {@link #DefaultUriDataSource(Context, TransferListener, String, boolean)} and passing
+   * {@code true} as the final argument.
    *
    *
+   * @param context A context.
+   * @param listener An optional {@link TransferListener}.
+   * @param userAgent The User-Agent string that should be used when requesting remote data.
+   */
+  public DefaultUriDataSource(Context context, TransferListener listener, String userAgent) {
+    this(context, listener, userAgent, false);
+  }
+
+  /**
+   * Constructs a new instance, optionally configured to follow cross-protocol redirects.
+   *
+   * @param context A context.
+   * @param listener An optional {@link TransferListener}.
    * @param userAgent The User-Agent string that should be used when requesting remote data.
    * @param userAgent The User-Agent string that should be used when requesting remote data.
-   * @param transferListener An optional listener.
    * @param allowCrossProtocolRedirects Whether cross-protocol redirects (i.e. redirects from HTTP
    * @param allowCrossProtocolRedirects Whether cross-protocol redirects (i.e. redirects from HTTP
    *     to HTTPS and vice versa) are enabled when fetching remote data..
    *     to HTTPS and vice versa) are enabled when fetching remote data..
    */
    */
-  public DefaultUriDataSource(String userAgent, TransferListener transferListener,
+  public DefaultUriDataSource(Context context, TransferListener listener, String userAgent,
       boolean allowCrossProtocolRedirects) {
       boolean allowCrossProtocolRedirects) {
-    this(new FileDataSource(transferListener),
-        new DefaultHttpDataSource(userAgent, null, transferListener,
+    this(context, listener,
+        new DefaultHttpDataSource(userAgent, null, listener,
             DefaultHttpDataSource.DEFAULT_CONNECT_TIMEOUT_MILLIS,
             DefaultHttpDataSource.DEFAULT_CONNECT_TIMEOUT_MILLIS,
             DefaultHttpDataSource.DEFAULT_READ_TIMEOUT_MILLIS, allowCrossProtocolRedirects));
             DefaultHttpDataSource.DEFAULT_READ_TIMEOUT_MILLIS, allowCrossProtocolRedirects));
   }
   }
 
 
   /**
   /**
-   * Constructs a new data source using {@code fileDataSource} for file URIs, and
-   * {@code httpDataSource} for non-file URIs.
+   * Constructs a new instance, using a provided {@link HttpDataSource} for fetching remote data.
    *
    *
-   * @param fileDataSource {@link UriDataSource} to use for file URIs.
+   * @param context A context.
+   * @param listener An optional {@link TransferListener}.
    * @param httpDataSource {@link UriDataSource} to use for non-file URIs.
    * @param httpDataSource {@link UriDataSource} to use for non-file URIs.
    */
    */
-  public DefaultUriDataSource(UriDataSource fileDataSource, UriDataSource httpDataSource) {
-    this.fileDataSource = Assertions.checkNotNull(fileDataSource);
+  public DefaultUriDataSource(Context context, TransferListener listener,
+      UriDataSource httpDataSource) {
     this.httpDataSource = Assertions.checkNotNull(httpDataSource);
     this.httpDataSource = Assertions.checkNotNull(httpDataSource);
+    this.fileDataSource = new FileDataSource(listener);
+    this.assetDataSource = new AssetDataSource(context, listener);
   }
   }
 
 
   @Override
   @Override
   public long open(DataSpec dataSpec) throws IOException {
   public long open(DataSpec dataSpec) throws IOException {
     Assertions.checkState(dataSource == null);
     Assertions.checkState(dataSource == null);
-    dataSource = FILE_URI_SCHEME.equals(dataSpec.uri.getScheme()) ? fileDataSource : httpDataSource;
+    // Choose the correct source for the scheme.
+    String scheme = dataSpec.uri.getScheme();
+    if (SCHEME_HTTP.equals(scheme) || SCHEME_HTTPS.equals(scheme)) {
+      dataSource = httpDataSource;
+    } else if (SCHEME_FILE.equals(scheme)) {
+      if (dataSpec.uri.getPath().startsWith("/android_asset/")) {
+        dataSource = assetDataSource;
+      } else {
+        dataSource = fileDataSource;
+      }
+    } else if (SCHEME_ASSET.equals(scheme)) {
+      dataSource = assetDataSource;
+    } else {
+      throw new UnsupportedSchemeException(scheme);
+    }
+    // Open the source and return.
     return dataSource.open(dataSpec);
     return dataSource.open(dataSpec);
   }
   }