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/*******************************************************************************
 * Copyright (c) 2011, 2013 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 v1.0 and Eclipse Distribution License v. 1.0 
 * which accompanies this distribution. 
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at 
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * 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;    
}