/*
    *  Copyright 2001-2009 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.field;
  
  import java.io.Serializable;
  
  import org.joda.time.DurationField;
  import org.joda.time.DurationFieldType;
  
  /**
   * <code>DelegatedDurationField</code> delegates each method call to the
   * duration field it wraps.
   * <p>
   * DelegatedDurationField is thread-safe and immutable, and its subclasses must
   * be as well.
   *
   * @author Brian S O'Neill
   * @see DecoratedDurationField
   * @since 1.0
   */
  public class DelegatedDurationField extends DurationField implements Serializable {
  
      /** Serialization lock. */
      private static final long serialVersionUID = -5576443481242007829L;
  
      /** The DurationField being wrapped */
      private final DurationField iField;
      /** The field type */
      private final DurationFieldType iType;
  
      /**
       * Constructor.
       * 
       * @param field  the base field
       */
      protected DelegatedDurationField(DurationField field) {
          this(field, null);
      }
  
      /**
       * Constructor.
       * 
       * @param field  the base field
       * @param type  the field type to use
       */
      protected DelegatedDurationField(DurationField field, DurationFieldType type) {
          super();
          if (field == null) {
              throw new IllegalArgumentException("The field must not be null");
          }
          iField = field;
          iType = (type == null ? field.getType() : type);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the wrapped duration field.
       * 
       * @return the wrapped DurationField
       */
      public final DurationField getWrappedField() {
          return iField;
      }
  
      public DurationFieldType getType() {
          return iType;
      }
  
      public String getName() {
          return iType.getName();
      }
  
      /**
       * Returns true if this field is supported.
       */
      public boolean isSupported() {
          return iField.isSupported();
      }
  
      public boolean isPrecise() {
          return iField.isPrecise();
      }
      
      public int getValue(long duration) {
          return iField.getValue(duration);
      }
 
     public long getValueAsLong(long duration) {
         return iField.getValueAsLong(duration);
     }
 
     public int getValue(long duration, long instant) {
         return iField.getValue(duration, instant);
     }
 
     public long getValueAsLong(long duration, long instant) {
         return iField.getValueAsLong(duration, instant);
     }
 
     public long getMillis(int value) {
         return iField.getMillis(value);
     }
 
     public long getMillis(long value) {
         return iField.getMillis(value);
     }
 
     public long getMillis(int value, long instant) {
         return iField.getMillis(value, instant);
     }
 
     public long getMillis(long value, long instant) {
         return iField.getMillis(value, instant);
     }
 
     public long add(long instant, int value) {
         return iField.add(instant, value);
     }
 
     public long add(long instant, long value) {
         return iField.add(instant, value);
     }
 
     public int getDifference(long minuendInstant, long subtrahendInstant) {
         return iField.getDifference(minuendInstant, subtrahendInstant);
     }
 
     public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
         return iField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
     }
 
     public long getUnitMillis() {
         return iField.getUnitMillis();
     }
 
     public int compareTo(DurationField durationField) {
         return iField.compareTo(durationField);
     }
 
     public boolean equals(Object obj) {
         if (obj instanceof DelegatedDurationField) {
             return iField.equals(((DelegatedDurationField) obj).iField);
         }
         return false;
     }
 
     public int hashCode() {
         return iField.hashCode() ^ iType.hashCode();
     }
 
     public String toString() {
         return (iType == null) ? iField.toString() :
             ("DurationField[" + iType + ']');
     }
 
 }