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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;
/**
* Transformation is an optional annotation for org.eclipse.persistence.mappings.oxm.XMLTransformationMapping.
* TransformationMapping allows to map an attribute to one or more database columns.
*
* Transformation annotation is an optional part of TransformationMapping definition.
* Unless the TransformationMapping is write-only, it should have a ReadTransformer,
* it defines transformation of xml data value(s)into attribute value.
* Also unless it's a read-only mapping, either WriteTransformer annotation or WriteTransformers annotation
* should be specified. Each WriteTransformer defines transformation of the attribute value to a single
* xml field value (XPath is specified in the WriteTransformer).
*
* @see org.eclipse.persistence.oxm.annotations.XmlReadTransformer
* @see org.eclipse.persistence.oxm.annotations.XmlWriteTransformer
* @see org.eclipse.persistence.oxm.annotations.XmlWriteTransformers
*
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface XmlTransformation {
/**
* (Optional) The optional element is a hint as to whether the value
* of the field or property may be null. It is disregarded
* for primitive types, which are considered non-optional.
*/
boolean optional() default true;
}