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/*
* EnumTransform.java May 2007
*
* Copyright (C) 2007, Niall Gallagher
*
* 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.simpleframework.xml.transform;
/**
* The EnumTransform
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 {
/**
* This is the specific enumeration that this transforms.
*/
private final Class type;
/**
* Constructor for the EnumTransform
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();
}
}