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.aggregation;
  
  import java.util.ArrayList;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import static java.util.Collections.unmodifiableList;
  import static java.util.Collections.unmodifiableSet;
  
  public final class QueryPlan {
  	private final List<Sequence> sequences;
  
  	public QueryPlan(List<Sequence> sequences) {
  		this.sequences = sequences;
  	}
  
  	public static class Sequence {
  		private final List<String> queryFields;
  		private final Set<String> chunksFields = new LinkedHashSet<>();
  		private final List<AggregationChunk> chunks = new ArrayList<>();
  
  		public Sequence(List<String> queryFields) {
  			this.queryFields = queryFields;
  		}
  
  		public List<String> getQueryFields() {
  			return unmodifiableList(queryFields);
  		}
  
  		public Set<String> getChunksFields() {
  			return unmodifiableSet(chunksFields);
  		}
  
  		public List<AggregationChunk> getChunks() {
  			return unmodifiableList(chunks);
  		}
  
  		public void add(AggregationChunk chunk) {
  			chunks.add(chunk);
  			chunksFields.addAll(chunk.getMeasures());
  		}
  
  		@Override
  		public String toString() {
  			return chunks.stream().map(AggregationChunk::getChunkId)
  				.map(String::valueOf)
  				.collect(Collectors.joining(",", "[", "]"));
  		}
  	}
  
  	public List<Sequence> getSequences() {
  		return unmodifiableList(sequences);
  	}
  
  	@Override
  	public String toString() {
  		StringBuilder sb = new StringBuilder();
  		sb
  			.append("\nSequences (")
  			.append(sequences.size())
  			.append("):");
  		for (int i = 0; i < sequences.size(); ++i) {
  			sb
  				.append('\n')
  				.append(i + 1)
  				.append(" (")
  				.append(sequences.get(i).chunks.size())
  				.append("). ")
  				.append(sequences.get(i));
  		}
  		return sb.toString();
  	}
  
  }
  