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ValueMapping.java
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/**
* Copyright 2012-2016 Gunnar Morling (http://www.gunnarmorling.de/)
* and/or other contributors as indicated by the @authors tag. See the
* copyright.txt file in the distribution for a full listing of all
* contributors.
*
* 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.mapstruct;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Configures the mapping of source constant value to target constant value.
* <p>
* Supported mappings are
* <ol>
* <li>Enumeration to Enumeration</li>
* </ol>
* <p>
* <B>Example 1:</B>
*
* <pre>
* <code>
* public enum OrderType { RETAIL, B2B, EXTRA, STANDARD, NORMAL }
*
* public enum ExternalOrderType { RETAIL, B2B, SPECIAL, DEFAULT }
*
* @ValueMappings({
* @ValueMapping(source = "EXTRA", target = "SPECIAL"),
* @ValueMapping(source = "STANDARD", target = "DEFAULT"),
* @ValueMapping(source = "NORMAL", target = "DEFAULT")
* })
* ExternalOrderType orderTypeToExternalOrderType(OrderType orderType);
* </code>
* Mapping result:
* +---------------------+----------------------------+
* | OrderType | ExternalOrderType |
* +---------------------+----------------------------+
* | null | null |
* | OrderType.EXTRA | ExternalOrderType.SPECIAL |
* | OrderType.STANDARD | ExternalOrderType.DEFAULT |
* | OrderType.NORMAL | ExternalOrderType.DEFAULT |
* | OrderType.RETAIL | ExternalOrderType.RETAIL |
* | OrderType.B2B | ExternalOrderType.B2B |
* +---------------------+----------------------------+
* </pre>
*
* MapStruct will <B>WARN</B> on incomplete mappings. However, if for some reason no match is found an
* {@link java.lang.IllegalStateException} will be thrown.
* <p>
* <B>Example 2:</B>
*
* <pre>
* <code>
* @ValueMappings({
* @ValueMapping( source = "<NULL>", target = "DEFAULT" ),
* @ValueMapping( source = "STANDARD", target = "<NULL>" ),
* @ValueMapping( source = "<ANY_REMAINING>", target = "SPECIAL" )
* })
* ExternalOrderType orderTypeToExternalOrderType(OrderType orderType);
* </code>
* Mapping result:
* +---------------------+----------------------------+
* | OrderType | ExternalOrderType |
* +---------------------+----------------------------+
* | null | ExternalOrderType.DEFAULT |
* | OrderType.STANDARD | null |
* | OrderType.RETAIL | ExternalOrderType.RETAIL |
* | OrderType.B2B | ExternalOrderType.B2B |
* | OrderType.NORMAL | ExternalOrderType.SPECIAL |
* | OrderType.EXTRA | ExternalOrderType.SPECIAL |
* +---------------------+----------------------------+
* </pre>
*
* @author Sjaak Derksen
*/
@Retention(RetentionPolicy.CLASS)
@Target(ElementType.METHOD)
public @interface ValueMapping {
/**
* The source value constant to use for this mapping.
*
* <p>
* <b>Valid values:</b>
* <ol>
* <li>enum constant name</li>
* <li>{@link MappingConstants#NULL}</li>
* <li>{@link MappingConstants#ANY_REMAINING}</li>
* <li>{@link MappingConstants#ANY_UNMAPPED}</li>
* </ol>
* <p>
* <b>NOTE:</b>When using <ANY_REMAINING>, MapStruct will perform the normal name based mapping, in which
* source is mapped to target based on enum identifier equality. Using <ANY_UNMAPPED> will not apply name
* based mapping.
*
* @return The source value.
*/
String source();
/**
* The target value constant to use for this mapping.
*
* <p>
* <b>Valid values:</b>
* <ol>
* <li>enum constant name</li>
* <li>{@link MappingConstants#NULL}</li>
* </ol>
*
* @return The target value.
*/
String target();
}