/*
// Licensed to Julian Hyde under one or more contributor license
// agreements. See the NOTICE file distributed with this work for
// additional information regarding copyright ownership.
//
// Julian Hyde 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 net.hydromatic.optiq.impl.jdbc;
import net.hydromatic.optiq.rules.java.EnumerableConvention;
import org.eigenbase.rel.RelNode;
import org.eigenbase.rel.convert.ConverterRule;
import org.eigenbase.relopt.RelTraitSet;
/**
* Rule to convert a relational expression from
* {@link JdbcConvention} to
* {@link EnumerableConvention}.
*/
public class JdbcToEnumerableConverterRule extends ConverterRule {
JdbcToEnumerableConverterRule(JdbcConvention out) {
super(RelNode.class, out, EnumerableConvention.INSTANCE,
"JdbcToEnumerableConverterRule:" + out);
}
@Override public RelNode convert(RelNode rel) {
RelTraitSet newTraitSet = rel.getTraitSet().replace(getOutTrait());
return new JdbcToEnumerableConverter(rel.getCluster(), newTraitSet, rel);
}
}
// End JdbcToEnumerableConverterRule.java