/*
* Licensed 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 com.facebook.presto.sql.rewrite;
import com.facebook.presto.Session;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.security.AccessControl;
import com.facebook.presto.sql.analyzer.QueryExplainer;
import com.facebook.presto.sql.parser.SqlParser;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.sql.tree.Statement;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Optional;
import static java.util.Objects.requireNonNull;
public final class StatementRewrite
{
private static final List<Rewrite> REWRITES = ImmutableList.of(
new DescribeInputRewrite(),
new DescribeOutputRewrite(),
new ShowQueriesRewrite(),
new ExplainRewrite());
private StatementRewrite() {}
public static Statement rewrite(
Session session,
Metadata metadata,
SqlParser parser,
Optional<QueryExplainer> queryExplainer,
Statement node,
List<Expression> parameters,
AccessControl accessControl)
{
for (Rewrite rewrite : REWRITES) {
node = requireNonNull(rewrite.rewrite(session, metadata, parser, queryExplainer, node, parameters, accessControl), "Statement rewrite returned null");
}
return node;
}
interface Rewrite
{
Statement rewrite(
Session session,
Metadata metadata,
SqlParser parser,
Optional<QueryExplainer> queryExplainer,
Statement node,
List<Expression> parameters,
AccessControl accessControl);
}
}