code: /*
   * 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.skywalking.oap.server.core.analysis.meter.function;
  
  import java.util.Arrays;
  import java.util.List;
  import lombok.Getter;
  import lombok.Setter;
  import lombok.ToString;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.skywalking.oap.server.core.analysis.metrics.DataTable;
  import org.apache.skywalking.oap.server.core.query.type.Bucket;
  import org.apache.skywalking.oap.server.core.query.type.HeatMap;
  
  /**
   * BucketedValues represents a value set, which elements are grouped by time bucket.
   */
  @ToString
  @Getter
  public class BucketedValues {
  
      @Setter
      private String group;
      /**
       * The element in the buckets represent the minimal value of this bucket, the max is defined by the next element.
       * Such as 0, 10, 50, 100 means buckets are [0, 10), [10, 50), [50, 100), [100, infinite+).
       *
       * The {@link Long#MIN_VALUE} could be the first bucket element to indicate there is no minimal value.
       */
      private long[] buckets;
      /**
       * {@link #buckets} and {@link #values} arrays should have the same length. The element in the values, represents
       * the amount in the same index bucket.
       */
      private long[] values;
  
      /**
       * @param buckets Read {@link #buckets}
       * @param values  Read {@link #values}
       */
      public BucketedValues(final long[] buckets, final long[] values) {
          if (buckets == null || values == null || buckets.length == 0 || values.length == 0) {
              throw new IllegalArgumentException("buckets and values can't be null.");
          }
          if (buckets.length != values.length) {
              throw new IllegalArgumentException("The length of buckets and values should be same.");
          }
          this.buckets = buckets;
          this.values = values;
      }
  
      /**
       * @return true if the bucket is same.
       */
      public boolean isCompatible(DataTable dataset) {
          final List<String> sortedKeys = dataset.sortedKeys(new HeatMap.KeyComparator(true));
          long[] existedBuckets = new long[sortedKeys.size()];
          for (int i = 0; i < sortedKeys.size(); i++) {
              String key = sortedKeys.get(i);
              if (key.equals(Bucket.INFINITE_NEGATIVE)) {
                  existedBuckets[i] = Long.MIN_VALUE;
              } else {
                  // remove the group name
                  if (key.contains(":")) {
                      key = StringUtils.substringAfterLast(key, ":");
                  }
                  existedBuckets[i] = Long.parseLong(key);
              }
          }
  
          return Arrays.equals(buckets, existedBuckets);
      }
  }
  