sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/parser/BeamSqlParser.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.parser;

import java.io.Reader;
import org.apache.beam.sdk.extensions.sql.impl.parser.impl.BeamSqlParserImpl;
import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.jdbc.CalcitePrepare;
import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.server.DdlExecutor;
import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.parser.SqlAbstractParserImpl;
import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.sql.parser.SqlParserImplFactory;

public class BeamSqlParser {

  private BeamSqlParser() {}

  /** Parser factory. */
  public static final SqlParserImplFactory FACTORY =
      new SqlParserImplFactory() {
        @Override
        public SqlAbstractParserImpl getParser(Reader stream) {
          return BeamSqlParserImpl.FACTORY.getParser(stream);
        }

        @Override
        public DdlExecutor getDdlExecutor() {
          return BeamSqlParser.DDL_EXECUTOR;
        }
      };

  /** Ddl Executor. */
  public static final DdlExecutor DDL_EXECUTOR =
      (context, node) -> {
        ((ExecutableStatement) node).execute(context);
      };

  interface ExecutableStatement {
    void execute(CalcitePrepare.Context context);
  }
}