sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamLogicalConvention.java

/*
 * 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.beam.sdk.extensions.sql.impl.rel;

import org.apache.calcite.plan.Convention;
import org.apache.calcite.plan.ConventionTraitDef;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelTrait;
import org.apache.calcite.plan.RelTraitDef;
import org.apache.calcite.plan.RelTraitSet;

/** Convertion for Beam SQL. */
public enum BeamLogicalConvention implements Convention {
  INSTANCE;

  @Override
  public Class getInterface() {
    return BeamRelNode.class;
  }

  @Override
  public String getName() {
    return "BEAM_LOGICAL";
  }

  @Override
  public RelTraitDef getTraitDef() {
    return ConventionTraitDef.INSTANCE;
  }

  @Override
  public boolean satisfies(RelTrait trait) {
    return this == trait;
  }

  @Override
  public void register(RelOptPlanner planner) {}

  @Override
  public String toString() {
    return getName();
  }

  @Override
  public boolean canConvertConvention(Convention toConvention) {
    return false;
  }

  @Override
  public boolean useAbstractConvertersForConversion(RelTraitSet fromTraits, RelTraitSet toTraits) {
    return false;
  }
}