Android Open Source - spades Entity Mapper

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright (C) 2013 Pau Picas Sans <pau.picas@gmail.com>
 *//from   w  ww  .j  a v a  2 s. c o  m
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package cat.picas.spades;

import android.content.ContentValues;
import android.database.Cursor;

public abstract class EntityMapper<T extends Entity> {

  private Table mTable;

  public EntityMapper(Table table) {
    table.validate();
    mTable = table;
  }

  public Table getTable() {
    return mTable;
  }

  public CursorInfo getDefaultCursorInfo() {
    return new CursorInfoBuilder().add(mTable).build();
  }

  public void putContentValues(T entity, ContentValues values) {
    mapContentValues(entity, values);
  }

  public T createFromCursor(Cursor cursor, CursorInfo cursorInfo) {
    if (!cursorInfo.hasTable(mTable)) {
      return null;
    }

    T entity = newInstance(cursor, cursorInfo);

    // Set the entity ID.
    int colIdIndex = cursorInfo.getColumnIndex(mTable.getColumnId());
    if (colIdIndex != CursorInfo.INVALID_INDEX) {
      if (cursor.isNull(colIdIndex)) {
        // As the entity ID is selected (the cursor has the column) and the value is null,
        // we should return null as this row doesn't contain any entity instance.
        return null;
      } else {
        entity.setEntityId(cursor.getLong(colIdIndex));
      }
    }

    // Manual population of the entity implemented by user.
    mapCursorValues(entity, cursor, cursorInfo);

    return entity;
  }

  protected abstract T newInstance(Cursor cursor, CursorInfo cursorInfo);

  protected abstract void mapContentValues(T entity, ContentValues values);

  protected abstract void mapCursorValues(T entity, Cursor cursor, CursorInfo cursorInfo);

}

Java Source Code List