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/*
* Copyright (c) 2011, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle = 2.2 - Initial contribution
package org.eclipse.persistence.oxm.annotations;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import org.eclipse.persistence.mappings.transformers.FieldTransformer;
/**
* Annotation for org.eclipse.persistence.mappings.oxm.XMLTransformationMapping.
* WriteTransformer defines transformation of the attribute value to a single
* XML value (XPath is specified in the WriteTransformer).
*
* A single XmlWriteTransformer may be specified directly on the method or
* attribute. Multiple XmlWriteTransformers should be wrapped into
* XmlWriteTransformers annotation. No XmlWriteTransformers specified for read-only
* mapping. Unless the XMLTransformationMapping is write-only, it should have a
* ReadTransformer, it defines transformation of XML value(s)
* into attribute value.
*
* @see org.eclipse.persistence.oxm.annotations.XmlReadTransformer
* @see org.eclipse.persistence.oxm.annotations.XmlTransformation
* @see org.eclipse.persistence.oxm.annotations.XmlWriteTransformers
*
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface XmlWriteTransformer {
/**
* User-defined class that must implement the
* org.eclipse.persistence.mappings.transformers.FieldTransformer interface.
* The class will be instantiated, its buildFieldValue will be used to
* create the value to be written into XML document.
* Either transformerClass or method must be specified, but not both.
*/
Class<? extends FieldTransformer> transformerClass() default FieldTransformer.class;
/**
* The mapped class must have a method with this name which returns a value
* to be written into the XML document.
* The method may require an XmlTransient annotation to avoid being mapped as
* an XmlElement by default.
* Either transformerClass or method must be specified, but not both.
*/
String method() default "";
/**
* Specify here the XPath into which the value should be written.
* The only case when this could be skipped is if a single WriteTransformer
* annotates an attribute - the attribute's name will be
* used as an element name.
*/
String xmlPath();
}