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.plan;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.List;
  
  /**
   * Children of a {@link org.apache.calcite.plan.RelOptRuleOperand} and the
   * policy for matching them.
   *
   * <p>Often created by calling one of the following methods:
   * {@link RelOptRule#some},
   * {@link RelOptRule#none},
   * {@link RelOptRule#any},
   * {@link RelOptRule#unordered}.
   *
   * @deprecated Use {@link RelRule.OperandBuilder}
   */
  @Deprecated // to be removed before 2.0
  public class RelOptRuleOperandChildren {
    static final RelOptRuleOperandChildren ANY_CHILDREN =
        new RelOptRuleOperandChildren(
            RelOptRuleOperandChildPolicy.ANY,
            ImmutableList.of());
  
    static final RelOptRuleOperandChildren LEAF_CHILDREN =
        new RelOptRuleOperandChildren(
            RelOptRuleOperandChildPolicy.LEAF,
            ImmutableList.of());
  
    final RelOptRuleOperandChildPolicy policy;
    final ImmutableList<RelOptRuleOperand> operands;
  
    public RelOptRuleOperandChildren(
        RelOptRuleOperandChildPolicy policy,
        List<RelOptRuleOperand> operands) {
      this.policy = policy;
      this.operands = ImmutableList.copyOf(operands);
    }
  }
  