Database helper for websql android applications

DatabaseHelper.java

package com.buddyg3.android;

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

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

public class DataBaseHelper extends SQLiteOpenHelper{

    //The Android's default system path of your application database.
    String DB_PATH = "/data/data/" + this.getClass().getPackage().getName() + "/app_database/file__0/"; 
    private static String DB_NAME = "0000000000000001.db";
    private static String[] DB_PARTS = new String[]{"1.db", "2.db", "3.db", "4.db", "5.db"};
    private static String[] DB_MANAGER_PARTS = new String[]{"Databases.db"};
    String DB_MANAGER_PATH = "/data/data/" + this.getClass().getPackage().getName() + "/app_database/";
    private static String DB_MANAGER_NAME = "Databases.db";
    private SQLiteDatabase myDataBase;
    private final Context myContext;

    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param context
     */
    public DataBaseHelper(Context context) {
        super(context, DB_NAME, null, 1);
        this.myContext = context;
    }

    /**
     * Creates a empty database on the system and rewrites it with your own database.
     * */
    public void createDataBase() throws IOException{
        boolean dbExist = checkDataBase();
        if(dbExist){
            //do nothing - database already exist
        }
        else{
            //By calling this method and empty database will be created into the default system path
            //of your application so we are gonna be able to overwrite that database with our database.
            this.getReadableDatabase();
            try {
                copyDataBase(DB_PATH, DB_NAME, DB_PARTS);
                copyDataBase(DB_MANAGER_PATH, DB_MANAGER_NAME, DB_MANAGER_PARTS);
            }
            catch (IOException e) {
                throw new Error("Error copying database");
            }
        }
    }

    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase(){
        SQLiteDatabase checkDB = null;
        try{
            String myPath = DB_MANAGER_PATH + DB_MANAGER_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
        }
        catch(SQLiteException e){
            //database does't exist yet.
        }
        if(checkDB != null){
            checkDB.close();
        }
        return checkDB != null ? true : false;
    }

    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     * */
    private void copyDataBase(String path, String name, String[] parts) throws IOException{
        // Path to the just created empty db
        File outPath = new File(path);
        outPath.mkdirs();
        String outFileName = path + name;
        File outFile = new File(outFileName);
        outFile.createNewFile();
        //Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFile, true);
        for(int i=0; i<parts.length; i++) {
	        //Open your local db as the input stream
	        InputStream myInput = myContext.getAssets().open(parts[i]);
	        //transfer bytes from the inputfile to the outputfile
	        byte[] buffer = new byte[1024];
	        int length;
	        while ((length = myInput.read(buffer))>0){
	            myOutput.write(buffer, 0, length);
	        }
	        myInput.close();
        }
        //Close the streams
        myOutput.flush();
        myOutput.close();
    }

    public void openDataBase() throws SQLException{
        //Open the database
        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
    }

    @Override
    public synchronized void close() {
        if(myDataBase != null)
            myDataBase.close();
        super.close();
    }

    @Override
    public void onCreate(SQLiteDatabase db) { }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { }

}