content: /*
   * 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.bookkeeper.bookie;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  import com.google.common.base.MoreObjects;
  import com.google.common.base.Objects;
  import com.google.common.collect.Lists;
  import java.io.IOException;
  import java.util.List;
  
  /**
   * A {@code CheckpointSourceList} manages a list of {@link CheckpointSource}s.
   */
  public class CheckpointSourceList implements CheckpointSource {
  
      private final List<? extends CheckpointSource> checkpointSourcesList;
  
      public CheckpointSourceList(List<? extends CheckpointSource> checkpointSourcesList) {
          this.checkpointSourcesList = checkpointSourcesList;
      }
  
      @Override
      public Checkpoint newCheckpoint() {
          return new CheckpointList(this);
      }
  
      @Override
      public void checkpointComplete(Checkpoint checkpoint, boolean compact) throws IOException {
          if (checkpoint == Checkpoint.MAX || checkpoint == Checkpoint.MIN) {
              return;
          }
  
          checkArgument(checkpoint instanceof CheckpointList);
          CheckpointList checkpointList = (CheckpointList) checkpoint;
  
          checkArgument(checkpointList.source == this);
          checkpointList.checkpointComplete(compact);
      }
  
      private static class CheckpointList implements Checkpoint {
          private final CheckpointSourceList source;
          private final List<Checkpoint> checkpoints;
  
          public CheckpointList(CheckpointSourceList source) {
              this.source = source;
              this.checkpoints = Lists.newArrayListWithCapacity(source.checkpointSourcesList.size());
              for (CheckpointSource checkpointSource : source.checkpointSourcesList) {
                  checkpoints.add(checkpointSource.newCheckpoint());
              }
          }
  
          private void checkpointComplete(boolean compact) throws IOException {
              for (int i = 0; i < source.checkpointSourcesList.size(); i++) {
                  source.checkpointSourcesList.get(i).checkpointComplete(checkpoints.get(i), compact);
              }
          }
  
          @Override
          public int hashCode() {
              return Objects.hashCode(source, checkpoints);
          }
  
          @Override
          public boolean equals(Object o) {
              if (!(o instanceof CheckpointList)) {
                  return false;
              }
              Checkpoint other = (Checkpoint) o;
              return 0 == compareTo(other);
          }
  
          @Override
          public int compareTo(Checkpoint o) {
              if (o == Checkpoint.MAX) {
                  return -1;
              } else if (o == Checkpoint.MIN) {
                  return 1;
              }
  
              checkArgument(o instanceof CheckpointList);
              CheckpointList other = (CheckpointList) o;
              if (checkpoints.size() != other.checkpoints.size()) {
                  return Integer.compare(checkpoints.size(), other.checkpoints.size());
              }
  
              for (int i = 0; i < checkpoints.size(); i++) {
                  int res = checkpoints.get(i).compareTo(other.checkpoints.get(i));
                  if (res != 0) {
                      return res;
                  }
              }
  
              return 0;
          }
  
          @Override
          public String toString() {
              return MoreObjects.toStringHelper(CheckpointList.class)
                  .add("checkpoints", checkpoints)
                  .toString();
          }
  
      }
  
  }
  