| /* |
| * 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.drill.exec.planner.sql.parser; |
| |
| import java.util.List; |
| |
| import org.apache.drill.exec.planner.sql.SchemaUtilities; |
| import org.apache.drill.exec.planner.sql.handlers.AbstractSqlHandler; |
| import org.apache.drill.exec.planner.sql.handlers.SqlHandlerConfig; |
| import org.apache.drill.exec.planner.sql.handlers.ViewHandler.DropView; |
| import org.apache.calcite.sql.SqlCall; |
| import org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.SqlLiteral; |
| import org.apache.calcite.sql.SqlNode; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.SqlSpecialOperator; |
| import org.apache.calcite.sql.SqlWriter; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| |
| import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList; |
| |
| public class SqlDropView extends DrillSqlCall { |
| public static final SqlSpecialOperator OPERATOR = new SqlSpecialOperator("DROP_VIEW", SqlKind.DROP_VIEW) { |
| @Override |
| public SqlCall createCall(SqlLiteral functionQualifier, SqlParserPos pos, SqlNode... operands) { |
| return new SqlDropView(pos, (SqlIdentifier) operands[0], (SqlLiteral) operands[1]); |
| } |
| }; |
| |
| private SqlIdentifier viewName; |
| private boolean viewExistenceCheck; |
| |
| public SqlDropView(SqlParserPos pos, SqlIdentifier viewName, SqlLiteral viewExistenceCheck) { |
| this(pos, viewName, viewExistenceCheck.booleanValue()); |
| } |
| |
| public SqlDropView(SqlParserPos pos, SqlIdentifier viewName, boolean viewExistenceCheck) { |
| super(pos); |
| this.viewName = viewName; |
| this.viewExistenceCheck = viewExistenceCheck; |
| } |
| |
| @Override |
| public SqlOperator getOperator() { |
| return OPERATOR; |
| } |
| |
| @Override |
| public List<SqlNode> getOperandList() { |
| final List<SqlNode> ops = |
| ImmutableList.of( |
| viewName, |
| SqlLiteral.createBoolean(viewExistenceCheck, SqlParserPos.ZERO) |
| ); |
| return ops; |
| } |
| |
| @Override |
| public void unparse(SqlWriter writer, int leftPrec, int rightPrec) { |
| writer.keyword("DROP"); |
| writer.keyword("VIEW"); |
| if (viewExistenceCheck) { |
| writer.keyword("IF"); |
| writer.keyword("EXISTS"); |
| } |
| viewName.unparse(writer, leftPrec, rightPrec); |
| } |
| |
| @Override |
| public AbstractSqlHandler getSqlHandler(SqlHandlerConfig config) { |
| return new DropView(config); |
| } |
| |
| public List<String> getSchemaPath() { |
| return SchemaUtilities.getSchemaPath(viewName); |
| } |
| |
| public String getName() { |
| if (viewName.isSimple()) { |
| return viewName.getSimple(); |
| } |
| |
| return viewName.names.get(viewName.names.size() - 1); |
| } |
| |
| public boolean checkViewExistence() { |
| return viewExistenceCheck; |
| } |
| |
| } |