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.util.format.postgresql.format.compiled;
  
  import org.apache.calcite.util.format.postgresql.ChronoUnitEnum;
  import org.apache.calcite.util.format.postgresql.PatternModifier;
  
  import java.text.ParseException;
  import java.text.ParsePosition;
  import java.time.ZonedDateTime;
  import java.util.Locale;
  import java.util.Set;
  
  /**
   * The date/time format compiled component for the hours and minutes of the timezone offset.
   * Can be just two digits plus sign if the UTC offset is a whole number of hours. Otherwise,
   * it is a value similar to "+07:30".
   */
  public class TimeZoneOffsetCompiledPattern extends CompiledPattern {
    public TimeZoneOffsetCompiledPattern(Set<PatternModifier> modifiers) {
      super(ChronoUnitEnum.TIMEZONE_MINUTES, modifiers);
    }
  
    @Override public String convertToString(ZonedDateTime dateTime, Locale locale) {
      final int offsetSeconds = dateTime.getOffset().getTotalSeconds();
      final int hours = offsetSeconds / 3600;
      final int minutes = (offsetSeconds % 3600) / 60;
  
      String formattedHours =
          String.format(Locale.ROOT, "%s%02d", hours < 0 ? "-" : "+", hours);
      if (minutes == 0) {
        return formattedHours;
      } else {
        return String.format(Locale.ROOT, "%s:%02d", formattedHours, minutes);
      }
    }
  
    @Override public int parseValue(ParsePosition inputPosition, String input, boolean enforceLength,
        Locale locale) throws ParseException {
      throw new ParseException("OF pattern is not supported in parsing datetime values",
          inputPosition.getIndex());
    }
  
    @Override protected int getBaseFormatPatternLength() {
      return 2;
    }
  
    @Override public boolean isNumeric() {
      return true;
    }
  }
  