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.bifromq.util.index;
  
  import java.util.Set;
  import org.pcollections.HashTreePSet;
  import org.pcollections.PSet;
  
  public class Branch<V> {
      final INode<V> iNode;
      PSet<V> values;
  
      Branch(INode<V> iNode) {
          this.iNode = iNode;
          this.values = HashTreePSet.empty();
      }
  
      Branch(V value) {
          this.iNode = null;
          this.values = HashTreePSet.empty();
          this.values = this.values.plus(value);
      }
  
      private Branch(INode<V> iNode, PSet<V> values) {
          this.iNode = iNode;
          this.values = values;
      }
  
      Branch<V> updated(INode<V> iNode) {
          return new Branch<>(iNode, values);
      }
  
      Branch<V> updated(V value) {
          PSet<V> newSubs = values;
          newSubs = newSubs.plus(value);
          return new Branch<>(iNode, newSubs);
      }
  
      Branch<V> removed(V sub) {
          PSet<V> newSubs = values;
          newSubs = newSubs.minus(sub);
          return new Branch<>(iNode, newSubs);
      }
  
      Set<V> values() {
          return values;
      }
  }
  