/*
    *  Copyright 2001-2005 Stephen Colebourne
    *
    *  Licensed 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.joda.time.chrono;
  
  import org.joda.time.DateTimeField;
  import org.joda.time.DateTimeFieldType;
  import org.joda.time.ReadablePartial;
  import org.joda.time.field.DecoratedDateTimeField;
  import org.joda.time.field.FieldUtils;
  
  /**
   * Provides time calculations for the year of era component of time.
   * 
   * @author Brian S O'Neill
   * @since 1.0
   */
  final class GJYearOfEraDateTimeField extends DecoratedDateTimeField {
  
      private static final long serialVersionUID = -5961050944769862059L;
  
      private final BasicChronology iChronology;
  
      /**
       * Restricted constructor.
       */
      GJYearOfEraDateTimeField(DateTimeField yearField, BasicChronology chronology) {
          super(yearField, DateTimeFieldType.yearOfEra());
          iChronology = chronology;
      }
  
      public int get(long instant) {
          int year = getWrappedField().get(instant);
          if (year <= 0) {
              year = 1 - year;
          }
          return year;
      }
  
      public long add(long instant, int years) {
          return getWrappedField().add(instant, years);
      }
  
      public long add(long instant, long years) {
          return getWrappedField().add(instant, years);
      }
  
      public long addWrapField(long instant, int years) {
          return getWrappedField().addWrapField(instant, years);
      }
  
      public int[] addWrapField(ReadablePartial instant, int fieldIndex, int[] values, int years) {
          return getWrappedField().addWrapField(instant, fieldIndex, values, years);
      }
  
      public int getDifference(long minuendInstant, long subtrahendInstant) {
          return getWrappedField().getDifference(minuendInstant, subtrahendInstant);
      }
  
      public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
          return getWrappedField().getDifferenceAsLong(minuendInstant, subtrahendInstant);
      }
  
      /**
       * Set the year component of the specified time instant.
       * 
       * @param instant  the time instant in millis to update.
       * @param year  the year (0,292278994) to update the time to.
       * @return the updated time instant.
       * @throws IllegalArgumentException  if year is invalid.
       */
      public long set(long instant, int year) {
          FieldUtils.verifyValueBounds(this, year, 1, getMaximumValue());
          if (iChronology.getYear(instant) <= 0) {
              year = 1 - year;
          }
          return super.set(instant, year);
      }
  
      public int getMinimumValue() {
          return 1;
      }
  
      public int getMaximumValue() {
          return getWrappedField().getMaximumValue();
      }
  
     public long roundFloor(long instant) {
         return getWrappedField().roundFloor(instant);
     }
 
     public long roundCeiling(long instant) {
         return getWrappedField().roundCeiling(instant);
     }
 
     public long remainder(long instant) {
         return getWrappedField().remainder(instant);
     }
 
     /**
      * Serialization singleton
      */
     private Object readResolve() {
         return iChronology.yearOfEra();
     }
 }