/*
* Copyright (C) 2010 Google Inc
*
* 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 org.datanucleus.store.appengine;
import com.google.appengine.api.datastore.Cursor;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.FetchOptions;
import com.google.appengine.api.datastore.PreparedQuery;
import com.google.appengine.api.datastore.QueryResultIterable;
import com.google.appengine.api.datastore.QueryResultList;
import org.datanucleus.ObjectManager;
import org.datanucleus.jdo.JDOPersistenceManager;
import java.util.List;
import javax.jdo.PersistenceManager;
/**
* Utilities for converting between the low-level datastore api and JDO.
* <br>
* This class is part of the public api of the DataNucleus App Engine plugin
* and can be safely used.
*
* @author Max Ross <max.ross@gmail.com>
*/
public final class JDODatastoreBridge extends PojoDatastoreBridge {
/**
* Convert the result of a low-level datastore query into a List of JDO
* entities.
*
* @param pm The PersistenceManager with which the conversion results will be
* associated.
* @param cls The type of object to which the {@link Entity Entities} in the
* result list should be converted.
* @param queryResultList The result of the low-level datastore query.
* @return The {@link Entity Entities} in the provided result list, converted
* to JDO entities.
*
* @see PreparedQuery#asQueryResultList(FetchOptions)
*/
public <T> List<T> toJDOResult(PersistenceManager pm, Class<T> cls, QueryResultList<Entity> queryResultList) {
return toJDOResult(pm, cls, queryResultList, queryResultList.getCursor());
}
/**
* Convert the result of a low-level datastore query into a List of JDO
* entities.
*
* @param pm The PersistenceManager with which the conversion results will be
* associated.
* @param cls The type of object to which the {@link Entity Entities} in the
* result iterable should be converted.
* @param queryResultIterable The result of the low-level datastore query.
* @return The {@link Entity Entities} in the provided result iterable,
* converted to JDO entities.
*
* @see PreparedQuery#asQueryResultIterable()
*/
public <T> List<T> toJDOResult(PersistenceManager pm, Class<T> cls, QueryResultIterable<Entity> queryResultIterable) {
return toJDOResult(pm, cls, queryResultIterable, null);
}
private <T> List<T> toJDOResult(PersistenceManager pm, Class<T> cls, Iterable<Entity> queryResultIterable, Cursor endCursor) {
ObjectManager om = ((JDOPersistenceManager) pm).getObjectManager();
return toPojoResult(om, cls, queryResultIterable, endCursor);
}
}