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SQL Parser and Optimizer

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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.hazelcast.org.apache.calcite.sql;

import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.util.DateString;

import java.util.Objects;

/**
 * A SQL literal representing a DATE value, such as DATE
 * '2004-10-22'.
 *
 * Create values using {@link SqlLiteral#createDate}.
 */
public class SqlDateLiteral extends SqlAbstractDateTimeLiteral {
  //~ Constructors -----------------------------------------------------------

  SqlDateLiteral(DateString d, SqlParserPos pos) {
    super(d, false, SqlTypeName.DATE, 0, pos);
  }

  //~ Methods ----------------------------------------------------------------

  /** Converts this literal to a {@link DateString}. */
  protected DateString getDate() {
    return (DateString) Objects.requireNonNull(value, "value");
  }

  @Override public SqlDateLiteral clone(SqlParserPos pos) {
    return new SqlDateLiteral(getDate(), pos);
  }

  @Override public String toString() {
    return "DATE '" + toFormattedString() + "'";
  }

  /**
   * Returns e.g. '1969-07-21'.
   */
  @Override public String toFormattedString() {
    return getDate().toString();
  }

  @Override public RelDataType createSqlType(RelDataTypeFactory typeFactory) {
    return typeFactory.createSqlType(getTypeName());
  }

  @Override public void unparse(
      SqlWriter writer,
      int leftPrec,
      int rightPrec) {
    writer.getDialect().unparseDateTimeLiteral(writer, this, leftPrec, rightPrec);
  }
}