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.metrics;
  
  import java.util.ArrayList;
  import java.util.List;
  import lombok.EqualsAndHashCode;
  import lombok.ToString;
  import org.apache.skywalking.oap.server.core.Const;
  import org.apache.skywalking.oap.server.core.storage.type.StorageDataComplexObject;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  
  /**
   * IntList is a serializable array list carrying int values.
   */
  @ToString
  @EqualsAndHashCode
  public class IntList implements StorageDataComplexObject<IntList> {
      private List<Integer> data;
  
      public IntList(int initialSize) {
          this.data = new ArrayList(initialSize);
      }
  
      public IntList(String valueString) {
          toObject(valueString);
      }
  
      public int size() {
          return data.size();
      }
  
      public boolean include(int value) {
          return data.contains(value);
      }
  
      @Override
      public String toStorageData() {
          StringBuilder builder = new StringBuilder();
  
          this.data.forEach(element -> {
              if (builder.length() != 0) {
                  // For the first element.
                  builder.append(Const.ARRAY_SPLIT);
              }
              builder.append(element);
          });
          return builder.toString();
      }
  
      @Override
      public void toObject(final String data) {
          if (StringUtil.isBlank(data)) {
              this.data = new ArrayList<>(3);
              return;
          }
          String[] elements = data.split(Const.ARRAY_PARSER_SPLIT);
          this.data = new ArrayList<>(elements.length);
          for (String element : elements) {
              this.data.add(Integer.parseInt(element));
          }
      }
  
      @Override
      public void copyFrom(final IntList source) {
          this.data.addAll(source.data);
      }
  
      public void add(final int value) {
          this.data.add(value);
      }
  
      public int get(final int idx) {
          return this.data.get(idx);
      }
  }
  