Android Open Source - filemanager Favourites Manager

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License

The source code is released under:

MIT License

Java Source Code

/*******************************************************************************
 * Copyright (c) 2014 Michal Dabski//from  w  ww  .  j  av  a 2s.com
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 ******************************************************************************/
package com.michaldabski.filemanager.favourites;

import android.content.Context;

import com.michaldabski.filemanager.sqlite.SQLiteHelper;

import java.io.File;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class FavouritesManager
{
  public static class FolderAlreadyFavouriteException extends Exception
  {

    public FolderAlreadyFavouriteException(FavouriteFolder folder) {
      super(folder.toString() + " is already bookmarked");
    }
    
  }
  
  public static interface FavouritesListener
  {
    void onFavouritesChanged(FavouritesManager favouritesManager);
  }
  
  private final List<FavouriteFolder> folders;
  private final SQLiteHelper sqLiteHelper;
  private final Set<FavouritesListener> favouritesListeners;

  public FavouritesManager(Context context) 
  {
    this.sqLiteHelper = new SQLiteHelper(context);
    this.favouritesListeners = new HashSet<FavouritesManager.FavouritesListener>();
    this.folders = sqLiteHelper.selectAll(FavouriteFolder.class);
    sort();
    fixFavouritesOrder();
  }
  
  public void sort()
  {
    Collections.sort(folders);
  }
  
  private void fixFavouritesOrder()
  {
    int lastOrder=0;
    for (FavouriteFolder folder : folders)
    {
      if (folder.hasValidOrder() == false || folder.getOrder() <= lastOrder)
      {
        folder.setOrder(lastOrder+1);
      }
        
      lastOrder = folder.getOrder();
    }
  }
  
  public void addFavouritesListener(FavouritesListener favouritesListener)
  {
    favouritesListeners.add(favouritesListener);
  }
  
  public void removeFavouritesListener(FavouritesListener favouritesListener)
  {
    favouritesListeners.remove(favouritesListener);
  }
  
  void notifyListeners()
  {
    for (FavouritesListener listener : favouritesListeners)
      listener.onFavouritesChanged(this);
  }
  
  public List<FavouriteFolder> getFolders()
  {
    return folders;
  }
  
  public void addFavourite(FavouriteFolder favouriteFolder) throws FolderAlreadyFavouriteException
  {
    long id = sqLiteHelper.insert(favouriteFolder);
    if (id == -1) throw new FolderAlreadyFavouriteException(favouriteFolder);
    folders.add(favouriteFolder);
    notifyListeners();
  }
  
  public void removeFavourite(File file)
  {
    for (FavouriteFolder folder : folders) if (folder.equals(file))
      {
        removeFavourite(folder);
        break;
      }
  }
  
  public void removeFavourite(FavouriteFolder favouriteFolder)
  {
    folders.remove(favouriteFolder);
    sqLiteHelper.delete(favouriteFolder);
    notifyListeners();
  }
  
  public boolean isFolderFavourite(File file)
  {
    for (FavouriteFolder folder : folders)
      if (folder.equals(file))
        return true;

    return false;
  }

}

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