Android Open Source - async_loader S Q Lite Cursor Loader

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License

The source code is released under:

Apache License

Java Source Code

package com.beinggreenrobot.content.loaderasync;
/*from  w w  w.  j a  va  2s . c  om*/
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.Arrays;

public class SQLiteCursorLoader extends AbstractCursorLoader {
  SQLiteOpenHelper db    =null;
  String rawQuery      =null;
  String[] args        =null;
  private final int type;

  /**
   * Creates a fully-specified SQLiteCursorLoader. See
   * {@link SQLiteDatabase#rawQuery(SQLiteDatabase, String, String[])
   * SQLiteDatabase.rawQuery()} for documentation on the meaning of the
   * parameters. These will be passed as-is to that call.
   * 
   * @param context
   *            context
   * @param db
   *            instance of SqLiteHelper
   * @param rawQuery
   *            your raw query here
   * @param args
   *            selection arguments
   * @param type
   *            your request type
   */
  public SQLiteCursorLoader(Context context, SQLiteOpenHelper db,
                            String rawQuery, String[] args, int type) {
    super(context);
    this.db      =db;
    this.rawQuery  =rawQuery;
    this.args    =args;
    this.type    =type;
  }

  /**
   * Runs on a worker thread and performs the actual
   * database query to retrieve the Cursor.
   */
  @Override
  protected Cursor buildCursor() {
    return(db.getReadableDatabase().rawQuery(rawQuery, args));
  }

  /**
   * Writes a semi-user-readable roster of contents to
   * supplied output.
   */
  @Override
  public void dump(String prefix, FileDescriptor fd,
                   PrintWriter writer, String[] args) {
    super.dump(prefix, fd, writer, args);
    writer.print(prefix);
    writer.print("rawQuery=");
    writer.println(rawQuery);
    writer.print(prefix);
    writer.print("args=");
    writer.println(Arrays.toString(args));
  }

  public void insert(String table, String nullColumnHack,
                     ContentValues values) {
    buildInsertTask(this).execute(db, table, nullColumnHack, values);
  }

  public void update(String table, ContentValues values,
                     String whereClause, String[] whereArgs) {
    buildUpdateTask(this).execute(db, table, values, whereClause,
                                  whereArgs);
  }

  public void replace(String table, String nullColumnHack,
                      ContentValues values) {
    buildReplaceTask(this).execute(db, table, nullColumnHack, values);
  }

  public void delete(String table, String whereClause,
                     String[] whereArgs) {
    buildDeleteTask(this).execute(db, table, whereClause, whereArgs);
  }

  public void execSQL(String sql, Object[] bindArgs) {
    buildExecSQLTask(this).execute(db, sql, bindArgs);
  }

  protected ContentChangingTask buildInsertTask(SQLiteCursorLoader loader) {
    return(new InsertTask(loader));
  }

  protected ContentChangingTask buildUpdateTask(SQLiteCursorLoader loader) {
    return(new UpdateTask(loader));
  }

  protected ContentChangingTask buildReplaceTask(SQLiteCursorLoader loader) {
    return(new ReplaceTask(loader));
  }

  protected ContentChangingTask buildDeleteTask(SQLiteCursorLoader loader) {
    return(new DeleteTask(loader));
  }

  protected ContentChangingTask buildExecSQLTask(SQLiteCursorLoader loader) {
    return(new ExecSQLTask(loader));
  }

  protected static class InsertTask extends ContentChangingTask {
    InsertTask(SQLiteCursorLoader loader) {
      super(loader);
    }

    @Override
    protected Void doInBackground(Object... params) {
      SQLiteOpenHelper db=(SQLiteOpenHelper)params[0];
      String table=(String)params[1];
      String nullColumnHack=(String)params[2];
      ContentValues values=(ContentValues)params[3];

      db.getWritableDatabase().insert(table, nullColumnHack, values);

      return(null);
    }
  }

  protected static class UpdateTask extends ContentChangingTask {
    UpdateTask(SQLiteCursorLoader loader) {
      super(loader);
    }

    @Override
    protected Void doInBackground(Object... params) {
      SQLiteOpenHelper db=(SQLiteOpenHelper)params[0];
      String table=(String)params[1];
      ContentValues values=(ContentValues)params[2];
      String where=(String)params[3];
      String[] whereParams=(String[])params[4];

      db.getWritableDatabase()
        .update(table, values, where, whereParams);

      return(null);
    }
  }

  protected static class ReplaceTask extends ContentChangingTask {
    ReplaceTask(SQLiteCursorLoader loader) {
      super(loader);
    }

    @Override
    protected Void doInBackground(Object... params) {
      SQLiteOpenHelper db=(SQLiteOpenHelper)params[0];
      String table=(String)params[1];
      String nullColumnHack=(String)params[2];
      ContentValues values=(ContentValues)params[3];

      db.getWritableDatabase().replace(table, nullColumnHack, values);

      return(null);
    }
  }

  protected static class DeleteTask extends ContentChangingTask {
    DeleteTask(SQLiteCursorLoader loader) {
      super(loader);
    }

    @Override
    protected Void doInBackground(Object... params) {
      SQLiteOpenHelper db=(SQLiteOpenHelper)params[0];
      String table=(String)params[1];
      String where=(String)params[2];
      String[] whereParams=(String[])params[3];

      db.getWritableDatabase().delete(table, where, whereParams);

      return(null);
    }
  }

  protected static class ExecSQLTask extends ContentChangingTask {
    ExecSQLTask(SQLiteCursorLoader loader) {
      super(loader);
    }

    @Override
    protected Void doInBackground(Object... params) {
      SQLiteOpenHelper db=(SQLiteOpenHelper)params[0];
      String sql=(String)params[1];
      Object[] bindParams=(Object[])params[2];

      db.getWritableDatabase().execSQL(sql, bindParams);

      return(null);
    }
  }
  
  public int getType() {
    return type;
  }
}

Java Source Code List

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