content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.cube.ot;
  
  import io.activej.etl.LogDiff;
  
  import java.util.List;
  import java.util.stream.Stream;
  
  import static java.util.stream.Collectors.toList;
  
  public interface CubeDiffScheme<D> {
  	D wrap(CubeDiff cubeDiff);
  
  	default List<CubeDiff> unwrap(D diff) {
  		return unwrapToStream(diff).collect(toList());
  	}
  
  	default Stream<CubeDiff> unwrapToStream(D diff) {
  		return unwrap(diff).stream();
  	}
  
  	static CubeDiffScheme<LogDiff<CubeDiff>> ofLogDiffs() {
  		return new CubeDiffScheme<>() {
  			@Override
  			public LogDiff<CubeDiff> wrap(CubeDiff cubeDiff) {
  				return LogDiff.forCurrentPosition(cubeDiff);
  			}
  
  			@Override
  			public List<CubeDiff> unwrap(LogDiff<CubeDiff> diff) {
  				return diff.getDiffs();
  			}
  		};
  	}
  
  	static CubeDiffScheme<CubeDiff> ofCubeDiffs() {
  		return new CubeDiffScheme<>() {
  			@Override
  			public CubeDiff wrap(CubeDiff cubeDiff) {
  				return cubeDiff;
  			}
  
  			@Override
  			public List<CubeDiff> unwrap(CubeDiff diff) {
  				return List.of(diff);
  			}
  		};
  	}
  }
  