/*
    * 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
    *
    *      https://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.commons.lang3.time;
  
  import java.time.ZoneId;
  import java.util.Date;
  import java.util.Locale;
  import java.util.Objects;
  import java.util.TimeZone;
  
  /**
   * An immutable {@link TimeZone}.
   */
  final class ImmutableTimeZone extends TimeZone {
  
      private static final long serialVersionUID = 1L;
      private final TimeZone timeZone;
  
      ImmutableTimeZone(final TimeZone timeZone) {
          this.timeZone = Objects.requireNonNull(timeZone, "timeZone");
      }
  
      @Override
      public Object clone() {
          // Immutable, so return this.
          return this;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public boolean equals(final Object obj) {
          if (this == obj) {
              return true;
          }
          if (!(obj instanceof TimeZone)) {
              return false;
          }
          final TimeZone other = (TimeZone) obj;
          return timeZone.equals(other instanceof ImmutableTimeZone ? ((ImmutableTimeZone) other).timeZone : other);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String getDisplayName(final boolean daylight, final int style, final Locale locale) {
          return timeZone.getDisplayName(daylight, style, locale);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int getDSTSavings() {
          return timeZone.getDSTSavings();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String getID() {
          return timeZone.getID();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int getOffset(final int era, final int year, final int month, final int day, final int dayOfWeek, final int milliseconds) {
          return timeZone.getOffset(era, year, month, day, dayOfWeek, milliseconds);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int getOffset(final long date) {
          return timeZone.getOffset(date);
      }
  
      /**
      * {@inheritDoc}
      */
     @Override
     public int getRawOffset() {
         return timeZone.getRawOffset();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public int hashCode() {
         return timeZone.hashCode();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean hasSameRules(final TimeZone other) {
         return timeZone.hasSameRules(other);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean inDaylightTime(final Date date) {
         return timeZone.inDaylightTime(date);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean observesDaylightTime() {
         return timeZone.observesDaylightTime();
     }
 
     /**
      * Sets no time zone property and always throws {@link UnsupportedOperationException}.
      */
     @Override
     public void setID(final String ID) {
         throw new UnsupportedOperationException("This class is immutable.");
     }
 
     /**
      * Sets no time zone property and always throws {@link UnsupportedOperationException}.
      */
     @Override
     public void setRawOffset(final int offsetMillis) {
         throw new UnsupportedOperationException("This class is immutable.");
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String toString() {
         return timeZone.toString();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public ZoneId toZoneId() {
         return timeZone.toZoneId();
     }
 
     TimeZone unwrap() {
         return timeZone;
     }
 
     @Override
     public boolean useDaylightTime() {
         return timeZone.useDaylightTime();
     }
 }