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.basecrdt.core.internal;
  
  import org.apache.bifromq.basecrdt.proto.Dot;
  import org.apache.bifromq.basecrdt.proto.StateLattice;
  import com.google.common.collect.Sets;
  import java.util.Iterator;
  import java.util.Set;
  
  class DotSet extends DotStore implements IDotSet {
      public static final IDotSet BOTTOM = new DotSet();
      private final Set<Dot> dots = Sets.newConcurrentHashSet();
  
      @Override
      public Iterator<Dot> iterator() {
          return dots.iterator();
      }
  
      @Override
      public boolean isBottom() {
          return dots.isEmpty();
      }
  
      @Override
      boolean add(StateLattice addState) {
          assert addState.getStateTypeCase() == StateLattice.StateTypeCase.SINGLEDOT;
          return dots.add(ProtoUtils.dot(addState.getSingleDot().getReplicaId(), addState.getSingleDot().getVer()));
      }
  
      @Override
      boolean remove(StateLattice removeState) {
          assert removeState.getStateTypeCase() == StateLattice.StateTypeCase.SINGLEDOT;
          return dots.remove(ProtoUtils.dot(removeState.getSingleDot().getReplicaId(),
              removeState.getSingleDot().getVer()));
      }
  
      @Override
      public String toString() {
          return "DotSet{dots=" + dots + '}';
      }
  }
  