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 com.datastax.oss.driver.internal.core.metadata.schema.events;
  
  import com.datastax.oss.driver.api.core.metadata.schema.AggregateMetadata;
  import com.datastax.oss.driver.internal.core.metadata.schema.SchemaChangeType;
  import java.util.Objects;
  import net.jcip.annotations.Immutable;
  
  @Immutable
  public class AggregateChangeEvent {
  
    public static AggregateChangeEvent dropped(AggregateMetadata oldAggregate) {
      return new AggregateChangeEvent(SchemaChangeType.DROPPED, oldAggregate, null);
    }
  
    public static AggregateChangeEvent created(AggregateMetadata newAggregate) {
      return new AggregateChangeEvent(SchemaChangeType.CREATED, null, newAggregate);
    }
  
    public static AggregateChangeEvent updated(
        AggregateMetadata oldAggregate, AggregateMetadata newAggregate) {
      return new AggregateChangeEvent(SchemaChangeType.UPDATED, oldAggregate, newAggregate);
    }
  
    public final SchemaChangeType changeType;
    /** {@code null} if the event is a creation */
    public final AggregateMetadata oldAggregate;
    /** {@code null} if the event is a drop */
    public final AggregateMetadata newAggregate;
  
    private AggregateChangeEvent(
        SchemaChangeType changeType, AggregateMetadata oldAggregate, AggregateMetadata newAggregate) {
      this.changeType = changeType;
      this.oldAggregate = oldAggregate;
      this.newAggregate = newAggregate;
    }
  
    @Override
    public boolean equals(Object other) {
      if (other == this) {
        return true;
      } else if (other instanceof AggregateChangeEvent) {
        AggregateChangeEvent that = (AggregateChangeEvent) other;
        return this.changeType == that.changeType
            && Objects.equals(this.oldAggregate, that.oldAggregate)
            && Objects.equals(this.newAggregate, that.newAggregate);
      } else {
        return false;
      }
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(changeType, oldAggregate, newAggregate);
    }
  
    @Override
    public String toString() {
      switch (changeType) {
        case CREATED:
          return String.format("AggregateChangeEvent(CREATED %s)", newAggregate.getSignature());
        case UPDATED:
          return String.format(
              "AggregateChangeEvent(UPDATED %s=>%s)",
              oldAggregate.getSignature(), newAggregate.getSignature());
        case DROPPED:
          return String.format("AggregateChangeEvent(DROPPED %s)", oldAggregate.getSignature());
        default:
          throw new IllegalStateException("Unsupported change type " + changeType);
      }
    }
  }
  