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Elastic Inferred Spans extension for OpenTelemetry Java

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/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. 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 co.elastic.otel.profiler;

import co.elastic.otel.profiler.collections.LongList;

/** List for maintaining pairs of (spanId,parentIds) both represented as longs. */
public class ChildList {

  // this list contains the (spanId,parentIds) flattened
  private LongList idsWithParentIds = new LongList();

  public void add(long id, long parentId) {
    idsWithParentIds.add(id);
    idsWithParentIds.add(parentId);
  }

  public long getId(int index) {
    return idsWithParentIds.get(index * 2);
  }

  public long getParentId(int index) {
    return idsWithParentIds.get(index * 2 + 1);
  }

  public int getSize() {
    return idsWithParentIds.getSize() / 2;
  }

  public void addAll(ChildList other) {
    idsWithParentIds.addAll(other.idsWithParentIds);
  }

  public void clear() {
    idsWithParentIds.clear();
  }

  public boolean isEmpty() {
    return getSize() == 0;
  }

  public void removeLast() {
    int size = idsWithParentIds.getSize();
    idsWithParentIds.remove(size - 1);
    idsWithParentIds.remove(size - 2);
  }
}