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Mongodb support for Querydsl
There is a newer version: 6.8
/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.querydsl.mongodb.morphia;

import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.querydsl.core.types.EntityPath;
import com.querydsl.mongodb.AbstractMongodbQuery;
import java.util.function.Function;
import org.mongodb.morphia.Datastore;
import org.mongodb.morphia.Morphia;
import org.mongodb.morphia.mapping.cache.DefaultEntityCache;
import org.mongodb.morphia.mapping.cache.EntityCache;

/**
 * {@code MorphiaQuery} extends {@link AbstractMongodbQuery} with Morphia specific transformations
 *
 * Example
 *
 * 
{@code
 * QUser user = QUser.user;
 * MorphiaQuery query = new MorphiaQuery(morphia, datastore, user);
 * List list = query
 *     .where(user.firstName.eq("Bob"))
 *     .fetch();
 * }
 *
 * @param  result type
 * @author laimw
 * @author tiwe
 */
public class MorphiaQuery extends AbstractMongodbQuery> {

  private final EntityCache cache;

  private final Datastore datastore;

  public MorphiaQuery(Morphia morphia, Datastore datastore, EntityPath entityPath) {
    this(morphia, datastore, new DefaultEntityCache(), entityPath);
  }

  public MorphiaQuery(Morphia morphia, Datastore datastore, Class entityType) {
    this(morphia, datastore, new DefaultEntityCache(), entityType);
  }

  public MorphiaQuery(
      Morphia morphia, Datastore datastore, EntityCache cache, EntityPath entityPath) {
    this(morphia, datastore, cache, entityPath.getType());
  }

  public MorphiaQuery(
      final Morphia morphia,
      final Datastore datastore,
      final EntityCache cache,
      final Class entityType) {
    super(
        datastore.getCollection(entityType),
        new Function() {
          @Override
          public K apply(DBObject dbObject) {
            return morphia.fromDBObject(datastore, entityType, dbObject, cache);
          }
        },
        new MorphiaSerializer(morphia));
    this.datastore = datastore;
    this.cache = cache;
  }

  @Override
  protected DBCursor createCursor() {
    cache.flush();
    return super.createCursor();
  }

  @Override
  protected DBCollection getCollection(Class type) {
    return datastore.getCollection(type);
  }
}