Android Open Source - InMemoryDb Typed Cursor Data Source

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License

The source code is released under:

Apache License

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Java Source Code

package org.gawst.asyncdb.source.typed;
/*from w  w w. ja  v  a 2s.c om*/
import android.content.ContentValues;
import android.database.Cursor;
import android.support.annotation.NonNull;

import org.gawst.asyncdb.DataSource;
import org.gawst.asyncdb.InvalidDbEntry;
import org.gawst.asyncdb.InvalidEntry;

/**
 * Abstract helper {@link org.gawst.asyncdb.DataSource} class reading using a {@link android.database.Cursor}.
 *
 * @param <E>      Type of the elements read from the {@code CURSOR}
 * @param <CURSOR> Wrapper around the raw {@code Cursor} read
 * @author Created by robUx4 on 11/01/2015.
 * @see TypedContentProviderDataSource
 * @see TypedSqliteDataSource
 * @see TypedSqliteMapDataSource
 */
public abstract class TypedCursorDataSource<E, INSERT_ID, DATABASE_ID, CURSOR extends Cursor> implements DataSource<E, INSERT_ID>, TypedDatabaseSource<INSERT_ID, DATABASE_ID, CURSOR> {

  private final TypedDatabaseElementHandler<E, CURSOR> databaseElementHandler;

  /**
   * Constructor.
   *
   * @param databaseElementHandler Handler to transform {@link E} elements to queries and {@code Cursor} to {@link E} elements.
   */
  public TypedCursorDataSource(@NonNull TypedDatabaseElementHandler<E, CURSOR> databaseElementHandler) {
    if (databaseElementHandler == null)
      throw new NullPointerException("null CursorSourceHandler in " + this);
    this.databaseElementHandler = databaseElementHandler;
  }

  @Override
  public final boolean update(E itemToUpdate, ContentValues updateValues) {
    return update(updateValues, databaseElementHandler.getItemSelectClause(itemToUpdate), databaseElementHandler.getItemSelectArgs(itemToUpdate)) != 0;
  }

  @Override
  public final boolean delete(E itemToDelete) {
    return delete(databaseElementHandler.getItemSelectClause(itemToDelete), databaseElementHandler.getItemSelectArgs(itemToDelete)) != 0;
  }

  @Override
  public final void queryAll(BatchReadingCallback<E> readingCallback) {
    CURSOR c = wrapCursor(query(null, null, null, null, null, null, null));
    if (c != null)
      try {
        if (c.moveToFirst()) {
          readingCallback.startLoadingAllItems(c.getCount());
          do {
            try {
              E item = databaseElementHandler.cursorToItem(c);
              readingCallback.addItemInMemory(item);
            } catch (InvalidDbEntry e) {
              readingCallback.removeInvalidEntry(e.getInvalidEntry());
            }
          } while (c.moveToNext());
        }
      } finally {
        c.close();
      }
  }

  @Override
  public boolean deleteInvalidEntry(InvalidEntry invalidEntry) {
    return delete(databaseElementHandler.getItemSelectClause(null), invalidEntry.getSelectArgs()) != 0;
  }
}

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