| /* |
| * 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 static org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.util.Static.RESOURCE; |
| |
| import java.util.List; |
| import org.apache.beam.sdk.extensions.sql.impl.BeamCalciteSchema; |
| import org.apache.beam.vendor.calcite.v1_20_0.com.google.common.collect.ImmutableList; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.jdbc.CalcitePrepare; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.jdbc.CalciteSchema; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlDrop; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlExecutableStatement; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlNode; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlOperator; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlUtil; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.SqlWriter; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.sql.parser.SqlParserPos; |
| |
| /** |
| * Base class for parse trees of {@code DROP TABLE}, {@code DROP VIEW} and {@code DROP MATERIALIZED |
| * VIEW} statements. |
| */ |
| abstract class SqlDropObject extends SqlDrop implements SqlExecutableStatement { |
| protected final SqlIdentifier name; |
| |
| /** Creates a SqlDropObject. */ |
| SqlDropObject(SqlOperator operator, SqlParserPos pos, boolean ifExists, SqlIdentifier name) { |
| super(operator, pos, ifExists); |
| this.name = name; |
| } |
| |
| @Override |
| public List<SqlNode> getOperandList() { |
| return ImmutableList.<SqlNode>of(name); |
| } |
| |
| @Override |
| public void unparse(SqlWriter writer, int leftPrec, int rightPrec) { |
| writer.keyword(getOperator().getName()); // "DROP TABLE" etc. |
| if (ifExists) { |
| writer.keyword("IF EXISTS"); |
| } |
| name.unparse(writer, leftPrec, rightPrec); |
| } |
| |
| @Override |
| public void execute(CalcitePrepare.Context context) { |
| final List<String> path = context.getDefaultSchemaPath(); |
| CalciteSchema schema = context.getRootSchema(); |
| for (String p : path) { |
| schema = schema.getSubSchema(p, true); |
| } |
| final boolean existed; |
| switch (getKind()) { |
| case DROP_TABLE: |
| if (schema.schema instanceof BeamCalciteSchema) { |
| BeamCalciteSchema beamSchema = (BeamCalciteSchema) schema.schema; |
| beamSchema.getTableProvider().dropTable(name.getSimple()); |
| existed = true; |
| } else { |
| existed = schema.removeTable(name.getSimple()); |
| } |
| if (!existed && !ifExists) { |
| throw SqlUtil.newContextException( |
| name.getParserPosition(), RESOURCE.tableNotFound(name.getSimple())); |
| } |
| break; |
| default: |
| throw new AssertionError(getKind()); |
| } |
| } |
| } |
| |
| // End SqlDropObject.java |