Android Open Source - BBC-News-Reader Item Clearer

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License

The source code is released under:

Copyright (c) 2011, 2012, Digital Lizard (Oscar Key, Thomas Boby) All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the...

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Java Source Code

package com.digitallizard.bbcnewsreader.data;
// w ww.  ja  v  a 2  s . c  o  m
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;

public class ItemClearer implements Runnable {
  volatile boolean isClearing;
  Thread thread;
  ContentResolver contentResolver;
  long threshold;
  
  public void clearItems(ContentResolver contentResolver, long threshold) {
    // only allow clearing if the thread isn't running
    if (!isClearing) {
      this.isClearing = true;
      this.contentResolver = contentResolver;
      this.threshold = threshold;
      thread = new Thread(this);
      thread.start();
    }
  }
  
  public void run() {
    // FIXME Optimise, should use a join
    // find items older than the threshold
    Uri uri = DatabaseProvider.CONTENT_URI_ITEMS;
    String[] projection = { DatabaseHelper.COLUMN_ITEM_ID };
    String selection = DatabaseHelper.COLUMN_ITEM_PUBDATE + "<?";
    String[] selectionArgs = { Long.toString(threshold) };
    Cursor cursor = contentResolver.query(uri, projection, selection, selectionArgs, null);
    
    // find the column indexes
    int id = cursor.getColumnIndex(DatabaseHelper.COLUMN_ITEM_ID);
    
    // loop through and delete the items
    while (cursor.moveToNext()) {
      Uri tempUri = Uri.withAppendedPath(DatabaseProvider.CONTENT_URI_ITEMS, Integer.toString(cursor.getInt(id)));
      contentResolver.delete(tempUri, null, null);
    }
    
    cursor.close();
    
    // mark the clearing as finished
    isClearing = false;
  }
  
  public ItemClearer() {
    isClearing = false;
    thread = null;
    contentResolver = null;
    threshold = 0;
  }
}

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