Android Open Source - longhorn Longhorn Open Helper

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2012 Santiago Valdarrama
 * //w  ww.  j av a  2 s  . c om
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at 
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
package com.svpino.longhorn.data;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import com.svpino.longhorn.R;

public class LonghornOpenHelper extends SQLiteOpenHelper {

  private static String DATABASE_DIRECTORY = "/data/data/com.svpino.longhorn/databases/";
  private static String DATABASE_NAME = "longhorn.rdb";
  private static String DATABASE_PATH = DATABASE_DIRECTORY + DATABASE_NAME;

  private final Context context;
  private boolean databaseNeedsToBeCreated;
  private boolean databaseNeedsToBeUpgraded;

  public LonghornOpenHelper(Context context) {
    super(context, DATABASE_NAME, null, context.getResources().getInteger(R.string.databaseVersion));
    this.context = context;
  }

  @Override
  public void onCreate(SQLiteDatabase db) {
    this.databaseNeedsToBeCreated = true;
  }

  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    this.databaseNeedsToBeUpgraded = true;
  }

  public void initialize() {
    getWritableDatabase();

    if (this.databaseNeedsToBeCreated) {
      try {
        copyDatabase();
      }
      catch (IOException e) {
      }
    }
    else if (this.databaseNeedsToBeUpgraded) {

    }
  }

  private void copyDatabase() throws IOException {
    close();

    InputStream inputStream = this.context.getAssets().open(DATABASE_NAME);
    OutputStream outputStream = new FileOutputStream(DATABASE_PATH);

    byte[] buffer = new byte[1024];
    int length;
    while ((length = inputStream.read(buffer)) > 0) {
      outputStream.write(buffer, 0, length);
    }

    outputStream.flush();
    outputStream.close();
    inputStream.close();

    getWritableDatabase().close();
  }

}

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