org.immutables.criteria.mongo.MongoBackend Maven / Gradle / Ivy

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/*
 * Copyright 2019 Immutables Authors and Contributors
 *
 * 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.immutables.criteria.mongo;

import org.immutables.criteria.backend.Backend;
import org.immutables.criteria.backend.KeyExtractor;

import java.util.Objects;

/**
 * Allows to query and modify mongo documents using criteria API.
 *
 * Based on Mongo reactive streams driver
 */
public class MongoBackend implements Backend {

  private final CollectionResolver collectionResolver;
  private final KeyExtractor.Factory keyExtractorFactory;

  public MongoBackend(MongoSetup setup) {
    Objects.requireNonNull(setup, "setup");
    this.collectionResolver = setup.collectionResolver();
    this.keyExtractorFactory = setup.keyExtractorFactory();
  }

  @Override
  public Session open(Class entityType) {
    Objects.requireNonNull(entityType, "context");
    KeyExtractor keyExtractor = keyExtractorFactory.create(entityType);
    return new MongoSession(collectionResolver.resolve(entityType), keyExtractor);
  }

}