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  package org.apache.cayenne.access.flush.operation;
  
  import java.util.Objects;
  
  import org.apache.cayenne.ObjectId;
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.map.DbEntity;
  
  /**
   * @since 4.2
   */
  public abstract class BaseDbRowOp implements DbRowOp {
  
      protected final Persistent object;
      protected final DbEntity entity;
      // Can be ObjEntity id or a DB row id for flattened rows
      protected ObjectId changeId;
      protected int hashCode;
  
      protected BaseDbRowOp(Persistent object, DbEntity entity, ObjectId id) {
          this.object = Objects.requireNonNull(object);
          this.entity = Objects.requireNonNull(entity);
          this.changeId = Objects.requireNonNull(id);
          this.hashCode = changeId.hashCode();
      }
  
      @Override
      public DbEntity getEntity() {
          return entity;
      }
  
      @Override
      public ObjectId getChangeId() {
          return changeId;
      }
  
      @Override
      public Persistent getObject() {
          return object;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (!(o instanceof DbRowOp)) return false;
  
          DbRowOp other = (DbRowOp) o;
          return changeId.equals(other.getChangeId());
      }
  
      @Override
      public int hashCode() {
          return hashCode;
      }
  
      @Override
      public String toString() {
          return entity.getName() + " " + changeId;
      }
  
      /**
       * Internal check used in the batching ops logic
       * @param rowOp to compare with
       * @return true if another op has the same entity name and datamap
       */
      protected boolean entitiesHaveSameNameAndDataMap(DbRowOp rowOp) {
          return getEntity().getName().equals(rowOp.getEntity().getName())
                  && getEntity().getDataMap().getName().equals(rowOp.getEntity().getDataMap().getName());
      }
  }
  