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.rel.core.Window.Group;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rex.RexLiteral;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  import java.util.Objects;
  
  /** Mutable equivalent of {@link org.apache.calcite.rel.core.Window}. */
  public class MutableWindow extends MutableSingleRel {
    public final List<Group> groups;
    public final List<RexLiteral> constants;
  
    private MutableWindow(RelDataType rowType, MutableRel input,
        List<Group> groups, List<RexLiteral> constants) {
      super(MutableRelType.WINDOW, rowType, input);
      this.groups = groups;
      this.constants = constants;
    }
  
    /**
     * Creates a MutableWindow.
     *
     * @param rowType   Row type
     * @param input     Input relational expression
     * @param groups    Window groups
     * @param constants List of constants that are additional inputs
     */
    public static MutableWindow of(RelDataType rowType,
        MutableRel input, List<Group> groups, List<RexLiteral> constants) {
      return new MutableWindow(rowType, input, groups, constants);
    }
  
    @Override public boolean equals(@Nullable Object obj) {
      return obj == this
          || obj instanceof MutableWindow
          && groups.equals(((MutableWindow) obj).groups)
          && constants.equals(((MutableWindow) obj).constants)
          && input.equals(((MutableWindow) obj).input);
    }
  
    @Override public int hashCode() {
      return Objects.hash(input, groups, constants);
    }
  
    @Override public StringBuilder digest(StringBuilder buf) {
      return buf.append("Window(groups: ").append(groups)
          .append(", constants: ").append(constants).append(")");
    }
  
    @Override public MutableRel clone() {
      return MutableWindow.of(rowType, input.clone(), groups, constants);
    }
  }
  