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.TimestampString;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A SQL literal representing a DATE, TIME or TIMESTAMP value.
   *
   * <p>Examples:
   *
   * <ul>
   * <li>DATE '2004-10-22'</li>
   * <li>TIME '14:33:44.567'</li>
   * <li><code>TIMESTAMP '1969-07-21 03:15 GMT'</code></li>
   * </ul>
   */
  public abstract class SqlAbstractDateTimeLiteral extends SqlLiteral {
    //~ Instance fields --------------------------------------------------------
  
    protected final boolean hasTimeZone;
    protected final int precision;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Constructs a datetime literal.
     */
    protected SqlAbstractDateTimeLiteral(Object d, boolean tz,
        SqlTypeName typeName, int precision, SqlParserPos pos) {
      super(d, typeName, pos);
      this.hasTimeZone = tz;
      this.precision = precision;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    /** Converts this literal to a {@link TimestampString}. */
    public TimestampString getTimestamp() {
      return (TimestampString) requireNonNull(value, "value");
    }
  
    public int getPrec() {
      return precision;
    }
  
    /**
     * Returns e.g. <code>DATE '1969-07-21'</code>.
     */
    @Override public abstract String toString();
  
    /**
     * Returns e.g. <code>1969-07-21</code>.
     */
    public abstract String toFormattedString();
  
    @Override public RelDataType createSqlType(RelDataTypeFactory typeFactory) {
      return typeFactory.createSqlType(
          getTypeName(),
          getPrec());
    }
  
    @Override public void unparse(
        SqlWriter writer,
        int leftPrec,
        int rightPrec) {
      writer.literal(this.toString());
    }
  }
  