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.convert;
  
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.plan.ConventionTraitDef;
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelOptPlanner;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.util.Util;
  
  import java.util.List;
  
  /**
   * <code>NoneConverter</code> converts a plan from <code>inConvention</code> to
   * {@link org.apache.calcite.plan.Convention#NONE}.
   */
  public class NoneConverter extends ConverterImpl {
    //~ Constructors -----------------------------------------------------------
  
    public NoneConverter(
        RelOptCluster cluster,
        RelNode child) {
      super(
          cluster,
          ConventionTraitDef.INSTANCE,
          cluster.traitSetOf(Convention.NONE),
          child);
    }
  
    //~ Methods ----------------------------------------------------------------
  
  
    @Override public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
      assert traitSet.comprises(Convention.NONE);
      return new NoneConverter(
          getCluster(),
          sole(inputs));
    }
  
    public static void init(RelOptPlanner planner) {
      // we can't convert from any conventions, therefore no rules to register
      Util.discard(planner);
    }
  }
  