| /* |
| * 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.calcite.sql.ddl; |
| |
| import org.apache.calcite.sql.SqlCreate; |
| import org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.SqlNode; |
| import org.apache.calcite.sql.SqlNodeList; |
| 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.calcite.util.ImmutableNullableList; |
| import org.apache.calcite.util.Pair; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| import org.checkerframework.checker.nullness.qual.Nullable; |
| |
| import java.util.AbstractList; |
| import java.util.List; |
| import java.util.Objects; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| import static org.apache.calcite.linq4j.Nullness.castNonNull; |
| |
| /** |
| * Parse tree for {@code CREATE FOREIGN SCHEMA} statement. |
| */ |
| public class SqlCreateForeignSchema extends SqlCreate { |
| public final SqlIdentifier name; |
| public final @Nullable SqlNode type; |
| public final @Nullable SqlNode library; |
| private final @Nullable SqlNodeList optionList; |
| |
| private static final SqlOperator OPERATOR = |
| new SqlSpecialOperator("CREATE FOREIGN SCHEMA", |
| SqlKind.CREATE_FOREIGN_SCHEMA); |
| |
| /** Creates a SqlCreateForeignSchema. */ |
| SqlCreateForeignSchema(SqlParserPos pos, boolean replace, boolean ifNotExists, |
| SqlIdentifier name, @Nullable SqlNode type, @Nullable SqlNode library, |
| @Nullable SqlNodeList optionList) { |
| super(OPERATOR, pos, replace, ifNotExists); |
| this.name = Objects.requireNonNull(name, "name"); |
| this.type = type; |
| this.library = library; |
| checkArgument((type == null) != (library == null), |
| "of type and library, exactly one must be specified"); |
| this.optionList = optionList; // may be null |
| } |
| |
| @SuppressWarnings("nullness") |
| @Override public List<SqlNode> getOperandList() { |
| return ImmutableNullableList.of(name, type, library, optionList); |
| } |
| |
| @Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) { |
| if (getReplace()) { |
| writer.keyword("CREATE OR REPLACE"); |
| } else { |
| writer.keyword("CREATE"); |
| } |
| writer.keyword("FOREIGN SCHEMA"); |
| if (ifNotExists) { |
| writer.keyword("IF NOT EXISTS"); |
| } |
| name.unparse(writer, leftPrec, rightPrec); |
| if (library != null) { |
| writer.keyword("LIBRARY"); |
| library.unparse(writer, 0, 0); |
| } |
| if (type != null) { |
| writer.keyword("TYPE"); |
| type.unparse(writer, 0, 0); |
| } |
| if (optionList != null) { |
| writer.keyword("OPTIONS"); |
| SqlWriter.Frame frame = writer.startList("(", ")"); |
| int i = 0; |
| for (Pair<SqlIdentifier, SqlNode> c : options()) { |
| if (i++ > 0) { |
| writer.sep(","); |
| } |
| c.left.unparse(writer, 0, 0); |
| c.right.unparse(writer, 0, 0); |
| } |
| writer.endList(frame); |
| } |
| } |
| |
| /** Returns options as a list of (name, value) pairs. */ |
| public List<Pair<SqlIdentifier, SqlNode>> options() { |
| return options(optionList); |
| } |
| |
| private static List<Pair<SqlIdentifier, SqlNode>> options( |
| final @Nullable SqlNodeList optionList) { |
| if (optionList == null) { |
| return ImmutableList.of(); |
| } |
| return new AbstractList<Pair<SqlIdentifier, SqlNode>>() { |
| @Override public Pair<SqlIdentifier, SqlNode> get(int index) { |
| return Pair.of((SqlIdentifier) castNonNull(optionList.get(index * 2)), |
| castNonNull(optionList.get(index * 2 + 1))); |
| } |
| |
| @Override public int size() { |
| return optionList.size() / 2; |
| } |
| }; |
| } |
| } |