SqlCreateView.java

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/*
 * 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 com.mapd.parser.extension.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.SqlWriterConfig;
import org.apache.calcite.sql.dialect.CalciteSqlDialect;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.sql.pretty.SqlPrettyWriter;
import org.apache.calcite.util.EscapedStringJsonBuilder;
import org.apache.calcite.util.ImmutableNullableList;

import java.util.List;
import java.util.Map;
import java.util.Objects;

public class SqlCreateView extends SqlCreate {
  public final SqlIdentifier name;
  public final SqlNodeList columnList;
  public final SqlNode query;

  private static final SqlOperator OPERATOR =
          new SqlSpecialOperator("CREATE VIEW", SqlKind.CREATE_VIEW);

  SqlCreateView(SqlParserPos pos,
          boolean replace,
          boolean ifNotExists,
          SqlIdentifier name,
          SqlNodeList columnList,
          SqlNode query) {
    super(OPERATOR, pos, replace, ifNotExists);
    this.name = Objects.requireNonNull(name);
    this.columnList = columnList; // may be null
    this.query = Objects.requireNonNull(query);
  }

  public List<SqlNode> getOperandList() {
    return ImmutableNullableList.of(name, columnList, query);
  }

  @Override
  public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
    if (getReplace()) {
      writer.keyword("CREATE OR REPLACE");
    } else {
      writer.keyword("CREATE");
    }
    writer.keyword("VIEW");
    name.unparse(writer, leftPrec, rightPrec);
    if (columnList != null) {
      SqlWriter.Frame frame = writer.startList("(", ")");
      for (SqlNode c : columnList) {
        writer.sep(",");
        c.unparse(writer, 0, 0);
      }
      writer.endList(frame);
    }
    writer.keyword("AS");
    writer.newlineAndIndent();
    query.unparse(writer, 0, 0);
  }

  @Override
  public String toString() {
    EscapedStringJsonBuilder jsonBuilder = new EscapedStringJsonBuilder();
    Map<String, Object> map = jsonBuilder.map();

    jsonBuilder.put(map, "name", this.name.toString());

    SqlWriterConfig c = SqlPrettyWriter.config()
                                .withDialect(CalciteSqlDialect.DEFAULT)
                                .withQuoteAllIdentifiers(false)
                                .withSelectListItemsOnSeparateLines(false)
                                .withWhereListItemsOnSeparateLines(false)
                                .withValuesListNewline(false);
    SqlPrettyWriter writer = new SqlPrettyWriter(c);
    this.query.unparse(writer, 0, 0);
    jsonBuilder.put(map, "query", writer.toString());

    jsonBuilder.put(map, "ifNotExists", this.ifNotExists);

    map.put("command", "CREATE_VIEW");
    Map<String, Object> payload = jsonBuilder.map();
    payload.put("payload", map);
    return jsonBuilder.toJsonString(payload);
  }
}