/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.gobblin.data.management.version.finder;

import java.io.IOException;
import java.util.Collection;
import java.util.List;
import org.apache.gobblin.data.management.version.FileSystemDatasetVersion;
import org.apache.gobblin.data.management.version.TimestampedDatasetStateStoreVersion;
import org.apache.gobblin.dataset.Dataset;
import org.apache.gobblin.metastore.DatasetStoreDataset;
import org.apache.gobblin.metastore.metadata.DatasetStateStoreEntryManager;
import com.google.common.collect.Lists;


/**
 * {@link VersionFinder} for {@link TimestampedDatasetStateStoreVersion}
 */
public class TimestampedDatasetStateStoreVersionFinder implements VersionFinder<TimestampedDatasetStateStoreVersion> {

  @Override
  public Class<? extends FileSystemDatasetVersion> versionClass() {
    return TimestampedDatasetStateStoreVersion.class;
  }

  @Override
  public Collection<TimestampedDatasetStateStoreVersion> findDatasetVersions(Dataset dataset) throws IOException {
    DatasetStoreDataset storeDataset = ((DatasetStoreDataset) dataset);
    List<TimestampedDatasetStateStoreVersion> versions = Lists.newArrayList();

    for (DatasetStateStoreEntryManager entry : storeDataset.getDatasetStateStoreMetadataEntries()) {
      versions.add(new TimestampedDatasetStateStoreVersion(entry));
    }
    return versions;
  }
}
