Android Open Source - GalDroid Clean Up Cache Task

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License

The source code is released under:

GNU General Public License

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Java Source Code

package de.raptor2101.GalDroid.WebGallery.Tasks;
// w  w w. ja v  a 2  s.  co  m
import java.io.File;
import java.lang.ref.WeakReference;
import java.util.List;

import de.raptor2101.GalDroid.Config.GalDroidPreference;
import de.raptor2101.GalDroid.WebGallery.ImageCache;
import android.os.AsyncTask;

public class CleanUpCacheTask extends AsyncTask<Void, Long, Void> {
  private WeakReference<CacheTaskListener> mListener;
  private List<String> mCachedObjects;
  private File mCacheDir;
  private long mCleanUpSize;

  public CleanUpCacheTask(ImageCache cache, CacheTaskListener listener) {
    mListener = new WeakReference<CacheTaskListener>(listener);
    mCachedObjects = GalDroidPreference.getCacheOjectsOrderedByAccessTime();

    mCacheDir = cache.getCacheDir();
    long maxCacheSize = cache.getMaxCacheSize();
    long cleanUpToSize = maxCacheSize - (maxCacheSize / 3);
    long currentCacheSize = GalDroidPreference.getCacheSpaceNeeded();
    mCleanUpSize = currentCacheSize - cleanUpToSize;
  }

  @Override
  protected void onPreExecute() {
    CacheTaskListener listener = mListener.get();
    if (listener != null) {
      listener.onCacheOperationStart(100);
    }
  }

  @Override
  protected Void doInBackground(Void... params) {
    long currentCleanUp = 0;
    if (mCleanUpSize > 0) {
      for (int i = 0; currentCleanUp < mCleanUpSize && i < mCachedObjects.size(); i++) {
        String hash = mCachedObjects.get(i);
        File cacheFile = new File(mCacheDir, hash);
        if (cacheFile.exists()) {
          currentCleanUp += cacheFile.length();
          cacheFile.delete();
        }
        GalDroidPreference.deleteCacheObject(hash);

        publishProgress(currentCleanUp);
      }
    }
    return null;
  }

  @Override
  protected void onProgressUpdate(Long... values) {
    CacheTaskListener listener = mListener.get();
    if (listener != null) {
      long calculatedValue = values[0] * 100 / mCleanUpSize;
      listener.onCacheOperationProgress((int) calculatedValue);
    }
  }

  @Override
  protected void onPostExecute(Void result) {
    CacheTaskListener listener = mListener.get();
    if (listener != null) {
      listener.onCacheOperationDone();
    }
  }

}

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