org.eclipse.persistence.indirection.WeavedAttributeValueHolderInterface 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) 1998, 2018 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 - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.indirection;

/**
 * INTERNAL:
 * This interface defines functionality required by ValueHolders for OneToOneMappings that
 * have LAZY access weaved into them and use Property (method) based access
 *
 * The weaving feature adds a paralell valueholder to the class it weaves and uses that valueholder
 * to control the lazy loading.  The methods on this interface provide information about how that weaved
 * valueholder is related to the underlying value.
 * @author tware
 *
 */
public interface WeavedAttributeValueHolderInterface extends ValueHolderInterface {

    /**
     * When a valueholder is triggered, the weaved code will ensure its value is
     * coordinated with the underlying property.  This method allows TopLink to determine
     * if that has happened.
     * @return
     */
    public boolean isCoordinatedWithProperty();

    /**
     * TopLink will call this method when the triggering of a weaved valueholder causes it's
     * value to be coordinated with the underlying property
     */
    public void setIsCoordinatedWithProperty(boolean coordinated);

    /**
     * This method returns whether this valueholder has been newly instantiated by weaved code.
     * @return
     */
    public boolean isNewlyWeavedValueHolder();

    /**
     * TopLink weaving calls this method on any valueholder it weaves into a class to indicate
     * that it is new and it's value should not be considered.  The method is also called when coordination
     * with the underlying value occurs to indicate the value can now be trusted.
     * @param isNew
     */
    public void setIsNewlyWeavedValueHolder(boolean isNew);

    /**
     * INTERNAL:
     * Return if add/remove should trigger instantiation or avoid.
     * Current instantiation is avoided is using change tracking.
     */
    public boolean shouldAllowInstantiationDeferral();

}