Android Open Source - Dumbledroid Disk Cache

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Back to project page Dumbledroid.

License

The source code is released under:

Copyright (c) 2013, Leocadio Tin? All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: ...

If you think the Android project Dumbledroid listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package io.leocad.dumbledroid.data.cache;
/* w w w  . ja v a  2s  . c  o  m*/
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import android.content.Context;
import android.util.Log;

public class DiskCache {

  private static final String TAG = "DiskCache";

  private static DiskCache INSTANCE;
  /**
   * @param ctx ALWAYS USE getApplicationContext() here.
   * @return
   */
  public static DiskCache getInstance(Context ctx) {

    if (INSTANCE == null) {
      INSTANCE = new DiskCache(ctx);
    }

    return INSTANCE;
  }

  private final FileController mFileCtrl;

  private DiskCache(Context ctx) {
    mFileCtrl = new FileController(ctx);
  }

  public void cache(String key, ModelHolder holder) {

    String fileName = String.valueOf(key.hashCode());

    try {
      FileOutputStream fos = mFileCtrl.getFileOutputStream(fileName);
      ObjectOutputStream oos = new ObjectOutputStream(fos);
      oos.writeObject(holder);

      oos.flush();
      oos.close();

      fos.flush();
      fos.close();

    } catch (IOException e) {
      Log.w(TAG, "The file " + fileName + "couldn't be cached. Does this app have permission to ACCESS_EXTERNAL_STORAGE?", e);
    }
  }

  public ModelHolder getCached(String key) {

    String fileName = String.valueOf(key.hashCode());

    try {
      FileInputStream fis = mFileCtrl.getFileInputStream(fileName);
      ObjectInputStream ois = new ObjectInputStream(fis);

      ModelHolder holder = (ModelHolder) ois.readObject();

      ois.close();
      fis.close();

      return holder;

    } catch (Exception e) {
      Log.w(TAG, "Can't access file: " + fileName, e);
      return null;
    }
  }
}

Java Source Code List