Android Open Source - android-todo-list Serialized Todo List Reader Writer

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License

The source code is released under:

MIT License

Java Source Code

/* The MIT License (MIT)
 * //  w w  w. java2 s .c  om
 * 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.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.OutputStream;


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

/**
 * Implementation of TodoListReaderWriter, where data is stored as serialized objects
 * @author Stephen
 *
 */
public class SerializedTodoListReaderWriter implements ITodoListReaderWriter {

  Context mContext;

  public SerializedTodoListReaderWriter(Context context) {
    mContext = context;
  }

  /**
   * Serialize a TodoList
   */
  public void write(String listName, TodoList list) {
    OutputStream os;
    ObjectOutput oo;
    try {
      os = new BufferedOutputStream(mContext.openFileOutput(listName, Context.MODE_PRIVATE));
      oo = new ObjectOutputStream(os);
      try {
        oo.writeObject(list);
        Log.d("writeTodoList", "Saved list to file " + listName);
      } finally {
        oo.close();
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  /**
   * Deserialize a TodoList
   */
  public TodoList read(String listName) {
    InputStream is;
    ObjectInput oi;
    try {
      try {
        is = new BufferedInputStream(mContext.openFileInput(listName));
      } catch (FileNotFoundException e) {
        Log.d("readTodoList", "No list found. Returning new one.");
        return new TodoList();
      }
      oi = new ObjectInputStream(is);
      try {
        TodoList list = (TodoList) oi.readObject();
        if (list == null) {
          Log.e("readTodoList", "Loaded list was null. Returning new list.");
          return new TodoList();
        } else {
          return list;
        }
      } catch (ClassNotFoundException e) {
        e.printStackTrace();
      } finally {
        oi.close();
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    Log.e("readTodoList", "Failed to load TodoList");
    return null;
  }
}

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