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      1 package com.bumptech.glide.load.data;
      2 
      3 import android.content.res.AssetManager;
      4 import android.util.Log;
      5 
      6 import com.bumptech.glide.Priority;
      7 
      8 import java.io.IOException;
      9 
     10 /**
     11  * An abstract class for obtaining data for an asset path using an {@link android.content.res.AssetManager}.
     12  *
     13  * @param <T> The type of data obtained from the asset path (InputStream, FileDescriptor etc).
     14  */
     15 public abstract class AssetPathFetcher<T> implements DataFetcher<T> {
     16     private static final String TAG = "AssetUriFetcher";
     17     private final String assetPath;
     18     private final AssetManager assetManager;
     19     private T data;
     20 
     21     public AssetPathFetcher(AssetManager assetManager, String assetPath) {
     22         this.assetManager = assetManager;
     23         this.assetPath = assetPath;
     24     }
     25 
     26     @Override
     27     public T loadData(Priority priority) throws Exception {
     28         data = loadResource(assetManager, assetPath);
     29         return data;
     30     }
     31 
     32     @Override
     33     public void cleanup() {
     34         if (data == null) {
     35             return;
     36         }
     37         try {
     38             close(data);
     39         } catch (IOException e) {
     40             if (Log.isLoggable(TAG, Log.VERBOSE)) {
     41                 Log.v(TAG, "Failed to close data", e);
     42             }
     43         }
     44 
     45     }
     46 
     47     @Override
     48     public String getId() {
     49         return assetPath;
     50     }
     51 
     52     @Override
     53     public void cancel() {
     54         // Do nothing.
     55     }
     56 
     57     /**
     58      * Opens the given asset path with the given {@link android.content.res.AssetManager} and returns the conrete data
     59      * type returned by the AssetManager.
     60      *
     61      * @param assetManager An AssetManager to use to open the given path.
     62      * @param path A string path pointing to a resource in assets to open.
     63      */
     64     protected abstract T loadResource(AssetManager assetManager, String path) throws IOException;
     65 
     66     /**
     67      * Closes the concrete data type if necessary.
     68      *
     69      * @param data The data to close.
     70      * @throws IOException
     71      */
     72     protected abstract void close(T data) throws IOException;
     73 }
     74