Android Open Source - android-todo-list Todo Container

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License

The source code is released under:

MIT License

Java Source Code

/* The MIT License (MIT)
 * //from  w ww. j  a va2 s  .c o  m
 * Copyright (c) 2014 Stephen Just
 * 
 * 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 ca.stephenjust.todolist.data;

import java.util.HashMap;
import java.util.Set;

import ca.stephenjust.todolist.TodoAdapter;

import android.content.Context;

/**
 * Singleton class to manage all to-do lists across the application.
 * @author Stephen Just
 *
 */
public class TodoContainer {

  static TodoContainer mInstance = null;

  public static final String TODO_CURRENT = "todolist.ser";
  public static final String TODO_ARCHIVE = "archive.ser";
  
  private HashMap<String, TodoList> mLists;
  private HashMap<String, TodoAdapter> mAdapters;

  /**
   * Private constructor
   */
  private TodoContainer() {
    mLists = new HashMap<String, TodoList>();
    mAdapters = new HashMap<String, TodoAdapter>();
  }
  
  public static TodoContainer getInstance() {
    if (mInstance != null) return mInstance;
    mInstance = new TodoContainer();
    return mInstance;
  }

  /**
   * Get a list adapter
   * @param context
   * @param name list name
   * @return
   */
  public TodoAdapter getAdapter(Context context, String name) {
    if (mAdapters.containsKey(name)) {
      if (mAdapters.get(name) == null) {
        mAdapters.put(name, new TodoAdapter(context, getList(context, name)));
      }
      return mAdapters.get(name);
    } else {
      mAdapters.put(name, new TodoAdapter(context, getList(context, name)));
      return mAdapters.get(name);
    }
  }

  /**
   * Get a list of items
   * @param context
   * @param name list name
   * @return
   */
  public TodoList getList(Context context, String name) {
    if (mLists.containsKey(name)) {
      if (mLists.get(name) == null) {
        mLists.put(name, new TodoList());
      }
      return mLists.get(name);
    } else {
      mLists.put(name, loadList(context, name));
      return mLists.get(name);
    }
  }

  /**
   * Load a list from the saved state
   * @param context
   * @param name
   * @return
   */
  private TodoList loadList(Context context, String name) {
    ITodoListReaderWriter rw = new SerializedTodoListReaderWriter(context);
    return rw.read(name);
  }

  /**
   * Save all lists
   * @param context
   */
  public void saveLists(Context context) {
    ITodoListReaderWriter rw = new SerializedTodoListReaderWriter(context);
    Set<String> keys = mLists.keySet();
    for (String key: keys) {
      rw.write(key, mLists.get(key));
      TodoAdapter adapter = mAdapters.get(key);
      if (adapter != null) {
        adapter.notifyDataSetChanged();
      }
    }
  }

}

Java Source Code List

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