Database.java

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/*
 * Software License Agreement (BSD License)
 *
 * Copyright (c) 2011, Willow Garage, Inc.
 * Copyright (c) 2013, Yujin Robot.
 *
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *  * Neither the name of Willow Garage, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *   
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
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package com.github.rosjava.android_remocons.rocon_remocon;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.util.Log;

public class Database extends ContentProvider {
    DatabaseHelper dbh;

    private class DatabaseHelper extends SQLiteOpenHelper {
        DatabaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            Log.i("MasterChooser", "Creating database...");
            db.execSQL(TABLE_CREATE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.i("MasterChooser", "The database is being upgraded from " + oldVersion + " to " + newVersion);
        }
    }

    public  static final Uri CONTENT_URI = Uri.parse("content://com.github.rosjava.android_remocons.rocon_remocon");
    public  static final int DATABASE_VERSION = 2;
    public  static final String DATABASE_NAME = "concertlist_table";
    public  static final String TABLE_NAME    = "concertlist";
    public  static final String TABLE_COLUMN  = "concerts";
    private static final String TABLE_CREATE  =
            "CREATE TABLE " + TABLE_NAME + " (" + TABLE_COLUMN + " TEXT);";

    @Override
    public int delete(Uri arg0, String arg1, String[] arg2) {
        Log.e("CurrentConcertContentProvider", "Invalid method: delete");
        return 0;
    }

    @Override
    public String getType(Uri uri) {
        Log.e("CurrentConcertContentProvider", "Invalid method: getType");
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        SQLiteDatabase db = dbh.getWritableDatabase();
        if (db == null) {
            Log.e("CurrentConcertContentProvider", "Could not get the writable database.");
            return null;
        }
        db.beginTransaction();
        if (values.get(TABLE_COLUMN) != null) {
            Log.i("CurrentConcertContentProvider", "Saving concert...");

            Cursor c = db.query(TABLE_NAME, new String[]{TABLE_COLUMN,},
                    null, new String[]{}, null, null, null);
            if (c.getCount() > 0) {
                Log.i("CurrentConcertContentProvider", "Update currently existing row");
                db.update(TABLE_NAME, values, null, new String[]{});
            } else {
                Log.i("CurrentConcertContentProvider", "Insert new row");
                if (db.insert(TABLE_NAME, null, values) < 0) {
                    Log.e("CurrentConcertContentProvider", "Error inserting row!");
                }
            }
        } else {
            Log.i("CurrentConcertContentProvider", "Deleting saved concert...");
            db.delete(TABLE_NAME, null, new String[]{});
        }

        db.setTransactionSuccessful();
        db.endTransaction();
        db.close();
        Log.i("CurrentConcertContentProvider", "Done saving current concert");
        return CONTENT_URI;
    }

    @Override
    public boolean onCreate() {
        dbh = new DatabaseHelper(this.getContext());
        if (dbh == null) {
            return false;
        } else {
            return true;
        }
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
                        String[] selectionArgs, String sortOrder) {
        SQLiteDatabase db = dbh.getReadableDatabase();
        Cursor res = db.query(TABLE_NAME, new String[]{TABLE_COLUMN,},
                null, new String[]{}, null, null, null);
        //db.close();
        return res;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
                      String[] selectionArgs) {
        Log.e("CurrentConcertContentProvider", "Invalid method: update");
        // TODO Auto-generated method stub
        return 0;
    }
}