org.eclipse.persistence.oxm.annotations.XmlClassExtractor Maven / Gradle / Ivy
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/*
* Copyright (c) 2011, 2024 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 java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* A ClassExtractor allows for a user defined class indicator in place of
* using xsi:type. The class has the following restrictions:
*
* - It must extend the {@linkplain org.eclipse.persistence.descriptors.ClassExtractor} class and implement the
* {@linkplain org.eclipse.persistence.descriptors.ClassExtractor#extractClassFromRow(org.eclipse.persistence.sessions.DataRecord, org.eclipse.persistence.sessions.Session)}
* method.
* - That method must take a database row (a {@linkplain org.eclipse.persistence.sessions.DataRecord}/Map) as an argument and
* must return the class to use for that row.
*
*
* This method will be used to decide which class to instantiate when
* unmarshalling an instance document.
*
* The ClassExtractor must only be set on the root of an entity class or
* sub-hierarchy in which a different inheritance strategy is applied.
*/
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface XmlClassExtractor {
/**
* Defines the name of the class extractor that should be
* applied to this entity's descriptor.
*/
Class value();
}