/*
* Copyright (C) 2011 Benoit GUEROUT <bguerout at gmail dot com> and Yves AMSELLEM <amsellem dot yves at gmail dot 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 org.jongo;
import com.mongodb.CommandResult;
import com.mongodb.DB;
import com.mongodb.DBObject;
import org.jongo.marshall.Unmarshaller;
import org.jongo.query.Query;
import org.jongo.query.QueryFactory;
import java.util.ArrayList;
import java.util.List;
import static org.jongo.ResultHandlerFactory.newResultHandler;
public class Command {
private final DB db;
private final Unmarshaller unmarshaller;
private final QueryFactory queryFactory;
private Query query;
private boolean throwOnError;
public Command(DB db, Unmarshaller unmarshaller, QueryFactory queryFactory, String query, Object... parameters) {
this.db = db;
this.unmarshaller = unmarshaller;
this.queryFactory = queryFactory;
this.query = this.queryFactory.createQuery(query, parameters);
}
public Command throwOnError() {
throwOnError = true;
return this;
}
public ResultCommand field(String fieldName) {
return new ResultCommand(fieldName);
}
public <T> T as(final Class<T> clazz) {
return map(newResultHandler(clazz, unmarshaller));
}
public <T> T map(ResultHandler<T> resultHandler) {
CommandResult commandResult = executeCommand();
return resultHandler.map(commandResult);
}
private CommandResult executeCommand() {
CommandResult commandResult = db.command(query.toDBObject());
if (throwOnError) {
commandResult.throwOnError();
}
return commandResult;
}
public class ResultCommand {
private String fieldName;
public ResultCommand(String fieldName) {
this.fieldName = fieldName;
}
public <T> List<T> as(final Class<T> clazz) {
return map(newResultHandler(clazz, unmarshaller));
}
public <T> List<T> map(ResultHandler<T> resultHandler) {
CommandResult commandResult = executeCommand();
List<DBObject> results = (List<DBObject>) commandResult.get(fieldName);
if (results == null) {
return new ArrayList<T>();
}
List<T> mappedResult = new ArrayList<T>(results.size());
for (DBObject dbObject : results) {
mappedResult.add(resultHandler.map(dbObject));
}
return mappedResult;
}
}
}