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