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package net.micode.notes.data;

import android.net.Uri; public class Notes { public static final String AUTHORITY = "micode_notes"; public static final String TAG = "Notes"; public static final int TYPE_NOTE = 0; public static final int TYPE_FOLDER = 1; public static final int TYPE_SYSTEM = 2;

/**
 * Following IDs are system folders' identifiers
 * {@link Notes#ID_ROOT_FOLDER } is default folder
 * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
 * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
 */
public static final int ID_ROOT_FOLDER = 0;
public static final int ID_TEMPARAY_FOLDER = -1;
public static final int ID_CALL_RECORD_FOLDER = -2;
public static final int ID_TRASH_FOLER = -3;

public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";

public static final int TYPE_WIDGET_INVALIDE      = -1;
public static final int TYPE_WIDGET_2X            = 0;
public static final int TYPE_WIDGET_4X            = 1;

public static class DataConstants {
    public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
    public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
}

/**
 * Uri to query all notes and folders
 */
public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");

/**
 * Uri to query data
 */
public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");

public interface NoteColumns {
    /**
     * The unique ID for a row
     * <P> Type: INTEGER (long) </P>
     */
    public static final String ID = "_id";

    /**
     * The parent's id for note or folder
     * <P> Type: INTEGER (long) </P>
     */
    public static final String PARENT_ID = "parent_id";

    /**
     * Created data for note or folder
     * <P> Type: INTEGER (long) </P>
     */
    public static final String CREATED_DATE = "created_date";

    /**
     * Latest modified date
     * <P> Type: INTEGER (long) </P>
     */
    public static final String MODIFIED_DATE = "modified_date";


    /**
     * Alert date
     * <P> Type: INTEGER (long) </P>
     */
    public static final String ALERTED_DATE = "alert_date";

    /**
     * Folder's name or text content of note
     * <P> Type: TEXT </P>
     */
    public static final String SNIPPET = "snippet";

    /**
     * Note's widget id
     * <P> Type: INTEGER (long) </P>
     */
    public static final String WIDGET_ID = "widget_id";

    /**
     * Note's widget type
     * <P> Type: INTEGER (long) </P>
     */
    public static final String WIDGET_TYPE = "widget_type";

    /**
     * Note's background color's id
     * <P> Type: INTEGER (long) </P>
     */
    public static final String BG_COLOR_ID = "bg_color_id";

    /**
     * For text note, it doesn't has attachment, for multi-media
     * note, it has at least one attachment
     * <P> Type: INTEGER </P>
     */
    public static final String HAS_ATTACHMENT = "has_attachment";

    /**
     * Folder's count of notes
     * <P> Type: INTEGER (long) </P>
     */
    public static final String NOTES_COUNT = "notes_count";

    /**
     * The file type: folder or note
     * <P> Type: INTEGER </P>
     */
    public static final String TYPE = "type";

    /**
     * The last sync id
     * <P> Type: INTEGER (long) </P>
     */
    public static final String SYNC_ID = "sync_id";

    /**
     * Sign to indicate local modified or not
     * <P> Type: INTEGER </P>
     */
    public static final String LOCAL_MODIFIED = "local_modified";

    /**
     * Original parent id before moving into temporary folder
     * <P> Type : INTEGER </P>
     */
    public static final String ORIGIN_PARENT_ID = "origin_parent_id";

    /**
     * The gtask id
     * <P> Type : TEXT </P>
     */
    public static final String GTASK_ID = "gtask_id";

    /**
     * The version code
     * <P> Type : INTEGER (long) </P>
     */
    public static final String VERSION = "version";
}

public interface DataColumns {
    /**
     * The unique ID for a row
     * <P> Type: INTEGER (long) </P>
     */
    public static final String ID = "_id";

    /**
     * The MIME type of the item represented by this row.
     * <P> Type: Text </P>
     */
    public static final String MIME_TYPE = "mime_type";

    /**
     * The reference id to note that this data belongs to
     * <P> Type: INTEGER (long) </P>
     */
    public static final String NOTE_ID = "note_id";

    /**
     * Created data for note or folder
     * <P> Type: INTEGER (long) </P>
     */
    public static final String CREATED_DATE = "created_date";

    /**
     * Latest modified date
     * <P> Type: INTEGER (long) </P>
     */
    public static final String MODIFIED_DATE = "modified_date";

    /**
     * Data's content
     * <P> Type: TEXT </P>
     */
    public static final String CONTENT = "content";


    /**
     * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
     * integer data type
     * <P> Type: INTEGER </P>
     */
    public static final String DATA1 = "data1";

    /**
     * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
     * integer data type
     * <P> Type: INTEGER </P>
     */
    public static final String DATA2 = "data2";

    /**
     * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
     * TEXT data type
     * <P> Type: TEXT </P>
     */
    public static final String DATA3 = "data3";

    /**
     * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
     * TEXT data type
     * <P> Type: TEXT </P>
     */
    public static final String DATA4 = "data4";

    /**
     * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
     * TEXT data type
     * <P> Type: TEXT </P>
     */
    public static final String DATA5 = "data5";
}

public static final class TextNote implements DataColumns {
    /**
     * Mode to indicate the text in check list mode or not
     * <P> Type: Integer 1:check list mode 0: normal mode </P>
     */
    public static final String MODE = DATA1;

    public static final int MODE_CHECK_LIST = 1;

    public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";

    public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";

    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
}

public static final class CallNote implements DataColumns {
    /**
     * Call date for this record
     * <P> Type: INTEGER (long) </P>
     */
    public static final String CALL_DATE = DATA1;

    /**
     * Phone number for this record
     * <P> Type: TEXT </P>
     */
    public static final String PHONE_NUMBER = DATA3;

    public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";

    public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";

    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
}

}

•  package net.micode.notes.data; ：声明了该类所在的Java包，用于对类进行逻辑分组与模块化管理，方便在大型项目中组织代码。
•  import android.net.Uri; ：引入 Uri 类，它在Android开发里常用于表示统一资源标识符，例如访问内容提供者（Content Provider）时，就需要用 Uri 来指定要操作的数据资源位置
•  package net.micode.notes.data; ：声明了该类所在的Java包，用于对类进行逻辑分组与模块化管理，方便在大型项目中组织代码。
•  import android.net.Uri; ：引入 Uri 类，它在Android开发里常用于表示统一资源标识符，例如访问内容提供者（Content Provider）时，就需要用 Uri 来指定要操作的数据资源位置
• 这段代码定义了多个整型常量，作为系统文件夹的标识符：
•  ID_ROOT_FOLDER 设为 0 ，代表默认文件夹。
•  ID_TEMPARAY_FOLDER 设为 -1 ，用于存放那些不属于任何文件夹的笔记。
•  ID_CALL_RECORD_FOLDER 设为 -2 ，用来存储通话记录相关的文件夹。
•  ID_TRASH_FOLER 设为 -3 ，推测是回收站文件夹。
• 定义了一系列静态常量字符串，这些字符串大概率是用于在 Intent 传递额外数据时的键名，不同的键对应不同类型的数据，比如提醒日期、背景颜色ID、小组件相关ID和类型、文件夹ID、通话日期等。
• 又定义了几个整型常量，用于区分不同类型的小组件， TYPE_WIDGET_INVALIDE 值为 -1 表示无效小组件， TYPE_WIDGET_2X 值为 0  、 TYPE_WIDGET_4X 值为 1 可能对应不同尺寸规格的小组件。
• 定义了两个 Uri 常量：
•  CONTENT_NOTE_URI ：通过 Uri.parse 方法，根据之前定义的 AUTHORITY 拼接出用于查询所有笔记和文件夹的 Uri 。
•  CONTENT_DATA_URI ：同样方式拼接出用于查询数据的 Uri ，这些 Uri 在与内容提供者交互、获取数据时是关键元素。
• 定义了一个接口 NoteColumns ，不过目前接口内部还没有具体的方法或者常量定义，通常接口用于定义一组相关方法的签名，后续大概率会在这里添加与笔记列相关的常量定义，方便数据库操作时统一列名。 第二个 package net.micode.notes.data;

import android.content.ContentValues; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log;

import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.DataConstants; import net.micode.notes.data.Notes.NoteColumns;

public class NotesDatabaseHelper extends SQLiteOpenHelper { private static final String DB_NAME = "note.db";

private static final int DB_VERSION = 4;

public interface TABLE {
    public static final String NOTE = "note";

    public static final String DATA = "data";
}

private static final String TAG = "NotesDatabaseHelper";

private static NotesDatabaseHelper mInstance;

private static final String CREATE_NOTE_TABLE_SQL =
    "CREATE TABLE " + TABLE.NOTE + "(" +
        NoteColumns.ID + " INTEGER PRIMARY KEY," +
        NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
        NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
        NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
        NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
        NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
        NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
    ")";

private static final String CREATE_DATA_TABLE_SQL =
    "CREATE TABLE " + TABLE.DATA + "(" +
        DataColumns.ID + " INTEGER PRIMARY KEY," +
        DataColumns.MIME_TYPE + " TEXT NOT NULL," +
        DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
        NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
        NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
        DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
        DataColumns.DATA1 + " INTEGER," +
        DataColumns.DATA2 + " INTEGER," +
        DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
        DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
        DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
    ")";

private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
    "CREATE INDEX IF NOT EXISTS note_id_index ON " +
    TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";

/**
 * Increase folder's note count when move note to the folder
 */
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
    "CREATE TRIGGER increase_folder_count_on_update "+
    " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
    " BEGIN " +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
    "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
    " END";

/**
 * Decrease folder's note count when move note from folder
 */
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
    "CREATE TRIGGER decrease_folder_count_on_update " +
    " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
    " BEGIN " +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
    "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
    "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
    " END";

/**
 * Increase folder's note count when insert new note to the folder
 */
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
    "CREATE TRIGGER increase_folder_count_on_insert " +
    " AFTER INSERT ON " + TABLE.NOTE +
    " BEGIN " +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
    "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
    " END";

/**
 * Decrease folder's note count when delete note from the folder
 */
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
    "CREATE TRIGGER decrease_folder_count_on_delete " +
    " AFTER DELETE ON " + TABLE.NOTE +
    " BEGIN " +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
    "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
    "  AND " + NoteColumns.NOTES_COUNT + ">0;" +
    " END";

/**
 * Update note's content when insert data with type {@link DataConstants#NOTE}
 */
private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
    "CREATE TRIGGER update_note_content_on_insert " +
    " AFTER INSERT ON " + TABLE.DATA +
    " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
    " BEGIN" +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
    "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
    " END";

/**
 * Update note's content when data with {@link DataConstants#NOTE} type has changed
 */
private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
    "CREATE TRIGGER update_note_content_on_update " +
    " AFTER UPDATE ON " + TABLE.DATA +
    " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
    " BEGIN" +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
    "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
    " END";

/**
 * Update note's content when data with {@link DataConstants#NOTE} type has deleted
 */
private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
    "CREATE TRIGGER update_note_content_on_delete " +
    " AFTER delete ON " + TABLE.DATA +
    " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
    " BEGIN" +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.SNIPPET + "=''" +
    "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
    " END";

/**
 * Delete datas belong to note which has been deleted
 */
private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
    "CREATE TRIGGER delete_data_on_delete " +
    " AFTER DELETE ON " + TABLE.NOTE +
    " BEGIN" +
    "  DELETE FROM " + TABLE.DATA +
    "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
    " END";

/**
 * Delete notes belong to folder which has been deleted
 */
private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
    "CREATE TRIGGER folder_delete_notes_on_delete " +
    " AFTER DELETE ON " + TABLE.NOTE +
    " BEGIN" +
    "  DELETE FROM " + TABLE.NOTE +
    "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
    " END";

/**
 * Move notes belong to folder which has been moved to trash folder
 */
private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
    "CREATE TRIGGER folder_move_notes_on_trash " +
    " AFTER UPDATE ON " + TABLE.NOTE +
    " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
    " BEGIN" +
    "  UPDATE " + TABLE.NOTE +
    "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
    "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
    " END";

public NotesDatabaseHelper(Context context) {
    super(context, DB_NAME, null, DB_VERSION);
}

public void createNoteTable(SQLiteDatabase db) {
    db.execSQL(CREATE_NOTE_TABLE_SQL);
    reCreateNoteTableTriggers(db);
    createSystemFolder(db);
    Log.d(TAG, "note table has been created");
}

private void reCreateNoteTableTriggers(SQLiteDatabase db) {
    db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
    db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
    db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
    db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
    db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
    db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
    db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");

    db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
    db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
    db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
    db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
    db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
    db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
    db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
}

private void createSystemFolder(SQLiteDatabase db) {
    ContentValues values = new ContentValues();

    /**
     * call record foler for call notes
     */
    values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
    values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
    db.insert(TABLE.NOTE, null, values);

    /**
     * root folder which is default folder
     */
    values.clear();
    values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
    values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
    db.insert(TABLE.NOTE, null, values);

    /**
     * temporary folder which is used for moving note
     */
    values.clear();
    values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
    values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
    db.insert(TABLE.NOTE, null, values);

    /**
     * create trash folder
     */
    values.clear();
    values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
    values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
    db.insert(TABLE.NOTE, null, values);
}

public void createDataTable(SQLiteDatabase db) {
    db.execSQL(CREATE_DATA_TABLE_SQL);
    reCreateDataTableTriggers(db);
    db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
    Log.d(TAG, "data table has been created");
}

private void reCreateDataTableTriggers(SQLiteDatabase db) {
    db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
    db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
    db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");

    db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
    db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
    db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
}

static synchronized NotesDatabaseHelper getInstance(Context context) {
    if (mInstance == null) {
        mInstance = new NotesDatabaseHelper(context);
    }
    return mInstance;
}

@Override
public void onCreate(SQLiteDatabase db) {
    createNoteTable(db);
    createDataTable(db);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    boolean reCreateTriggers = false;
    boolean skipV2 = false;

    if (oldVersion == 1) {
        upgradeToV2(db);
        skipV2 = true; // this upgrade including the upgrade from v2 to v3
        oldVersion++;
    }

    if (oldVersion == 2 && !skipV2) {
        upgradeToV3(db);
        reCreateTriggers = true;
        oldVersion++;
    }

    if (oldVersion == 3) {
        upgradeToV4(db);
        oldVersion++;
    }

    if (reCreateTriggers) {
        reCreateNoteTableTriggers(db);
        reCreateDataTableTriggers(db);
    }

    if (oldVersion != newVersion) {
        throw new IllegalStateException("Upgrade notes database to version " + newVersion
                + "fails");
    }
}

private void upgradeToV2(SQLiteDatabase db) {
    db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
    db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
    createNoteTable(db);
    createDataTable(db);
}

private void upgradeToV3(SQLiteDatabase db) {
    // drop unused triggers
    db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
    db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
    db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
    // add a column for gtask id
    db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
            + " TEXT NOT NULL DEFAULT ''");
    // add a trash system folder
    ContentValues values = new ContentValues();
    values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
    values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
    db.insert(TABLE.NOTE, null, values);
}

private void upgradeToV4(SQLiteDatabase db) {
    db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
            + " INTEGER NOT NULL DEFAULT 0");
}

} 第三个 ackage net.micode.notes.data;

import android.app.SearchManager; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.content.Intent; import android.content.UriMatcher; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.net.Uri; import android.text.TextUtils; import android.util.Log;

import net.micode.notes.R; import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE;

public class NotesProvider extends ContentProvider { private static final UriMatcher mMatcher;

private NotesDatabaseHelper mHelper;

private static final String TAG = "NotesProvider";

private static final int URI_NOTE            = 1;
private static final int URI_NOTE_ITEM       = 2;
private static final int URI_DATA            = 3;
private static final int URI_DATA_ITEM       = 4;

private static final int URI_SEARCH          = 5;
private static final int URI_SEARCH_SUGGEST  = 6;

static {
    mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
    mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
    mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
    mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
    mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
    mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
    mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
}

/**
 * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
 * we will trim '\n' and white space in order to show more information.
 */
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
    + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
    + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
    + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
    + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
    + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
    + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;

private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
    + " FROM " + TABLE.NOTE
    + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
    + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
    + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;

@Override
public boolean onCreate() {
    mHelper = NotesDatabaseHelper.getInstance(getContext());
    return true;
}

@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
        String sortOrder) {
    Cursor c = null;
    SQLiteDatabase db = mHelper.getReadableDatabase();
    String id = null;
    switch (mMatcher.match(uri)) {
        case URI_NOTE:
            c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
                    sortOrder);
            break;
        case URI_NOTE_ITEM:
            id = uri.getPathSegments().get(1);
            c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
                    + parseSelection(selection), selectionArgs, null, null, sortOrder);
            break;
        case URI_DATA:
            c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
                    sortOrder);
            break;
        case URI_DATA_ITEM:
            id = uri.getPathSegments().get(1);
            c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
                    + parseSelection(selection), selectionArgs, null, null, sortOrder);
            break;
        case URI_SEARCH:
        case URI_SEARCH_SUGGEST:
            if (sortOrder != null || projection != null) {
                throw new IllegalArgumentException(
                        "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
            }

            String searchString = null;
            if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
                if (uri.getPathSegments().size() > 1) {
                    searchString = uri.getPathSegments().get(1);
                }
            } else {
                searchString = uri.getQueryParameter("pattern");
            }

            if (TextUtils.isEmpty(searchString)) {
                return null;
            }

            try {
                searchString = String.format("%%%s%%", searchString);
                c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
                        new String[] { searchString });
            } catch (IllegalStateException ex) {
                Log.e(TAG, "got exception: " + ex.toString());
            }
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
    }
    if (c != null) {
        c.setNotificationUri(getContext().getContentResolver(), uri);
    }
    return c;
}

@Override
public Uri insert(Uri uri, ContentValues values) {
    SQLiteDatabase db = mHelper.getWritableDatabase();
    long dataId = 0, noteId = 0, insertedId = 0;
    switch (mMatcher.match(uri)) {
        case URI_NOTE:
            insertedId = noteId = db.insert(TABLE.NOTE, null, values);
            break;
        case URI_DATA:
            if (values.containsKey(DataColumns.NOTE_ID)) {
                noteId = values.getAsLong(DataColumns.NOTE_ID);
            } else {
                Log.d(TAG, "Wrong data format without note id:" + values.toString());
            }
            insertedId = dataId = db.insert(TABLE.DATA, null, values);
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
    }
    // Notify the note uri
    if (noteId > 0) {
        getContext().getContentResolver().notifyChange(
                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
    }

    // Notify the data uri
    if (dataId > 0) {
        getContext().getContentResolver().notifyChange(
                ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
    }

    return ContentUris.withAppendedId(uri, insertedId);
}

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
    int count = 0;
    String id = null;
    SQLiteDatabase db = mHelper.getWritableDatabase();
    boolean deleteData = false;
    switch (mMatcher.match(uri)) {
        case URI_NOTE:
            selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
            count = db.delete(TABLE.NOTE, selection, selectionArgs);
            break;
        case URI_NOTE_ITEM:
            id = uri.getPathSegments().get(1);
            /**
             * ID that smaller than 0 is system folder which is not allowed to
             * trash
             */
            long noteId = Long.valueOf(id);
            if (noteId <= 0) {
                break;
            }
            count = db.delete(TABLE.NOTE,
                    NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
            break;
        case URI_DATA:
            count = db.delete(TABLE.DATA, selection, selectionArgs);
            deleteData = true;
            break;
        case URI_DATA_ITEM:
            id = uri.getPathSegments().get(1);
            count = db.delete(TABLE.DATA,
                    DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
            deleteData = true;
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
    }
    if (count > 0) {
        if (deleteData) {
            getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
        }
        getContext().getContentResolver().notifyChange(uri, null);
    }
    return count;
}

@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
    int count = 0;
    String id = null;
    SQLiteDatabase db = mHelper.getWritableDatabase();
    boolean updateData = false;
    switch (mMatcher.match(uri)) {
        case URI_NOTE:
            increaseNoteVersion(-1, selection, selectionArgs);
            count = db.update(TABLE.NOTE, values, selection, selectionArgs);
            break;
        case URI_NOTE_ITEM:
            id = uri.getPathSegments().get(1);
            increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
            count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
                    + parseSelection(selection), selectionArgs);
            break;
        case URI_DATA:
            count = db.update(TABLE.DATA, values, selection, selectionArgs);
            updateData = true;
            break;
        case URI_DATA_ITEM:
            id = uri.getPathSegments().get(1);
            count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
                    + parseSelection(selection), selectionArgs);
            updateData = true;
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
    }

    if (count > 0) {
        if (updateData) {
            getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
        }
        getContext().getContentResolver().notifyChange(uri, null);
    }
    return count;
}

private String parseSelection(String selection) {
    return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}

private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
    StringBuilder sql = new StringBuilder(120);
    sql.append("UPDATE ");
    sql.append(TABLE.NOTE);
    sql.append(" SET ");
    sql.append(NoteColumns.VERSION);
    sql.append("=" + NoteColumns.VERSION + "+1 ");

    if (id > 0 || !TextUtils.isEmpty(selection)) {
        sql.append(" WHERE ");
    }
    if (id > 0) {
        sql.append(NoteColumns.ID + "=" + String.valueOf(id));
    }
    if (!TextUtils.isEmpty(selection)) {
        String selectString = id > 0 ? parseSelection(selection) : selection;
        for (String args : selectionArgs) {
            selectString = selectString.replaceFirst("\\?", args);
        }
        sql.append(selectString);
    }

    mHelper.getWritableDatabase().execSQL(sql.toString());
}

@Override
public String getType(Uri uri) {
    // TODO Auto-generated method stub
    return null;
}

}