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.calcite.rel.mutable;
  
  import org.apache.calcite.plan.RelOptTable;
  import org.apache.calcite.rel.core.TableScan;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  import java.util.Objects;
  
  /** Mutable equivalent of {@link org.apache.calcite.rel.core.TableScan}. */
  public class MutableScan extends MutableLeafRel {
    private MutableScan(TableScan rel) {
      super(MutableRelType.TABLE_SCAN, rel);
    }
  
    /**
     * Creates a MutableScan.
     *
     * @param scan  The underlying TableScan object
     */
    public static MutableScan of(TableScan scan) {
      return new MutableScan(scan);
    }
  
    private @Nullable List<String> tableQualifiedName() {
      RelOptTable table = rel.getTable();
      return table == null ? null : table.getQualifiedName();
    }
  
    @Override public boolean equals(@Nullable Object obj) {
      if (!(obj instanceof MutableScan)) {
        return false;
      }
      MutableScan other = (MutableScan) obj;
      return obj == this
          || Objects.equals(tableQualifiedName(), other.tableQualifiedName());
    }
  
    @Override public int hashCode() {
      return Objects.hashCode(tableQualifiedName());
    }
  
    @Override public StringBuilder digest(StringBuilder buf) {
      return buf.append("Scan(table: ")
          .append(tableQualifiedName()).append(")");
    }
  
    @Override public MutableRel clone() {
      return MutableScan.of((TableScan) rel);
    }
  }
  