content: /*
   * 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;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeFactory;
  import org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.calcite.sql.type.SqlTypeName;
  import org.apache.calcite.util.DateString;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A SQL literal representing a DATE value, such as <code>DATE
   * '2004-10-22'</code>.
   *
   * <p>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) 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);
    }
  }
  