content: /*
   * EnumTransform.java May 2007
   *
   * Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
   *
   * 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 com.aliyun.odps.simpleframework.xml.transform;
  
  /**
   * The <code>EnumTransform</code> represents a transform that is 
   * used to transform enumerations to strings and back again. This
   * is used when enumerations are used in comma separated arrays.
   * This may be created multiple times for different types.
   * 
   * @author Niall Gallagher
   */
  class EnumTransform implements Transform<Enum> {
     
     /**
      * This is the specific enumeration that this transforms.
      */
     private final Class type;
     
     /**
      * Constructor for the <code>EnumTransform</code> object. This
      * is used to create enumerations from strings and convert them
      * back again. This allows enumerations to be used in arrays.
      * 
      * @param type this is the enumeration type to be transformed
      */
     public EnumTransform(Class type) {
        this.type = type;
     }
  
     /**
      * This method is used to convert the string value given to an
      * appropriate representation. This is used when an object is
      * being deserialized from the XML document and the value for
      * the string representation is required.
      * 
      * @param value this is the string representation of the value
      * 
      * @return this returns an appropriate instanced to be used
      */
     public Enum read(String value) throws Exception {
        return Enum.valueOf(type, value);
     }
  
     /**
      * This method is used to convert the provided value into an XML
      * usable format. This is used in the serialization process when
      * there is a need to convert a field value in to a string so 
      * that that value can be written as a valid XML entity.
      * 
      * @param value this is the value to be converted to a string
      * 
      * @return this is the string representation of the given value
      */
     public String write(Enum value) throws Exception {
        return value.name();
     }
  }