Android Open Source - android-open-street-map Manage Tiles Cached

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License

The source code is released under:

Apache License

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Java Source Code

package com.android.lib.map.osm;
/*from w w w.  j a v  a 2 s.  c  o m*/
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;

public class ManageTilesCached {

  private static final int AVERAGE_TILE_SIZE = 35; // in Kb
  
  private File mDirectory;
  
  public ManageTilesCached(File directory) {
    mDirectory = directory;
  }
  
  /**
   * Delete tiles above a certain limit (first in first out)
   * @param limit in Mb
   */
  public void deleteTilesAboveLimit(int limit) {
    
    final int limitKb = limit * 1024; //put limit in Kb 
    
    if (mDirectory == null)
      return;
    
    Thread t = new Thread() {
      @Override
      public void run() {
    
        //long time = Calendar.getInstance().getTimeInMillis();
        
        List<File> files = getAllFilesInDirectories(mDirectory);
        
        Map<Long, File> filesMap = new HashMap<Long, File>();
        for (File file : files) {
          filesMap.put(file.lastModified(), file);
        }
        
        int filesSizeKb = AVERAGE_TILE_SIZE * files.size();
        if (filesSizeKb > limitKb) {
          
          int nbFilesToDeleted = (filesSizeKb - limitKb) / AVERAGE_TILE_SIZE;
          
          TreeSet<Long> keys = new TreeSet<Long>(filesMap.keySet());
          for (Long key : keys) {
            
            if (nbFilesToDeleted <= 0)
              break;
            
            File fileValue = filesMap.get(key);
            fileValue.delete();
            
            nbFilesToDeleted--;
          }  
          
        }
        
        //Log.i("ManageTilesCached", "File count= " + files.size());
        //Log.i("ManageTilesCached", "time= " + (Calendar.getInstance().getTimeInMillis() - time) + "ms");
    
      }
    };
    t.start();
  }
  
  public static List<File> getAllFilesInDirectories(File directory) {
        
    List<File> files = new ArrayList<File>();
        
        for (File file : directory.listFiles()) {
            if (file.isFile()) {
                
              files.add(file);
              
            }
            if (file.isDirectory()) {
              files.addAll(getAllFilesInDirectories(file));
            }
        }
        return files;
    }
  
}

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