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