org.eclipse.persistence.oxm.annotations.XmlTransformation Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation

EclipseLink build based upon Git transaction f2b9fc5

There is a newer version: 5.0.0-B03

/*
 * 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;
}