/*
    *  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;
  
  /**
   * This field is not publicy exposed by ISOChronology, but rather it is used to
   * build the yearOfCentury and centuryOfEra fields. It merely drops the sign of
   * the year.
   *
   * @author Brian S O'Neill
   * @see GJYearOfEraDateTimeField
   * @since 1.0
   */
  class ISOYearOfEraDateTimeField extends DecoratedDateTimeField {
  
      private static final long serialVersionUID = 7037524068969447317L;
  
      /**
       * Singleton instance
       */
      static final DateTimeField INSTANCE = new ISOYearOfEraDateTimeField();
  
      /**
       * Restricted constructor.
       */
      private ISOYearOfEraDateTimeField() {
          super(GregorianChronology.getInstanceUTC().year(), DateTimeFieldType.yearOfEra());
      }
  
      public int get(long instant) {
          int year = getWrappedField().get(instant);
          return year < 0 ? -year : 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);
      }
  
      public long set(long instant, int year) {
          FieldUtils.verifyValueBounds(this, year, 0, getMaximumValue());
          if (getWrappedField().get(instant) < 0) {
              year = -year;
          }
          return super.set(instant, year);
      }
  
      public int getMinimumValue() {
          return 0;
      }
  
      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 INSTANCE;
     }
 }