DefaultDatasetProvider.java

/*
 * Copyright © 2015 Cask Data, 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 co.cask.cdap.data2.datafabric.dataset;

import co.cask.cdap.api.dataset.Dataset;
import co.cask.cdap.api.dataset.DatasetProperties;
import co.cask.cdap.data2.dataset2.DatasetFramework;
import co.cask.cdap.proto.Id;
import com.google.inject.Inject;

import java.util.Map;
import javax.annotation.Nullable;

/**
 * Provides {@link Dataset} instances using {@link DatasetFramework}. Default implementation.
 */
public class DefaultDatasetProvider implements DatasetProvider {

  private final DatasetFramework framework;

  @Inject
  public DefaultDatasetProvider(DatasetFramework framework) {
    this.framework = framework;
  }

  @Override
  @SuppressWarnings("unchecked")
  public <T extends Dataset> T get(
    Id.DatasetInstance instance,
    @Nullable ClassLoader classLoader,
    @Nullable Map<String, String> arguments) throws Exception {

    return framework.getDataset(instance, arguments, classLoader);
  }

  @Override
  public <T extends Dataset> T getOrCreate(
    Id.DatasetInstance instance, String type, DatasetProperties creationProps,
    @Nullable ClassLoader classLoader,
    @Nullable Map<String, String> arguments) throws Exception {

    return DatasetsUtil.getOrCreateDataset(framework, instance, type, creationProps, arguments, classLoader);
  }

}