content: /*
   * Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
   *
   * 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 com.lidroid.xutils.db.sqlite;
  
  import com.lidroid.xutils.db.table.ColumnUtils;
  import com.lidroid.xutils.db.table.Foreign;
  import com.lidroid.xutils.db.table.Table;
  import com.lidroid.xutils.exception.DbException;
  
  import java.util.List;
  
  public class ForeignLazyLoader<T> {
      private final Foreign foreignColumn;
      private Object columnValue;
  
      public ForeignLazyLoader(Foreign foreignColumn, Object value) {
          this.foreignColumn = foreignColumn;
          this.columnValue = ColumnUtils.convert2DbColumnValueIfNeeded(value);
      }
  
      public List<T> getAllFromDb() throws DbException {
          List<T> entities = null;
          Table table = foreignColumn.getTable();
          if (table != null) {
              entities = table.db.findAll(
                      Selector.from(foreignColumn.getForeignEntityType()).
                              where(foreignColumn.getForeignColumnName(), "=", columnValue)
              );
          }
          return entities;
      }
  
      public T getFirstFromDb() throws DbException {
          T entity = null;
          Table table = foreignColumn.getTable();
          if (table != null) {
              entity = table.db.findFirst(
                      Selector.from(foreignColumn.getForeignEntityType()).
                              where(foreignColumn.getForeignColumnName(), "=", columnValue)
              );
          }
          return entity;
      }
  
      public void setColumnValue(Object value) {
          this.columnValue = ColumnUtils.convert2DbColumnValueIfNeeded(value);
      }
  
      public Object getColumnValue() {
          return columnValue;
      }
  }
  