| /* |
| * Copyright (c) 1998, 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 - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.mappings.transformers; |
| |
| import org.eclipse.persistence.sessions.Session; |
| |
| /** |
| * <p><b>Purpose</b>: Allows a field to always be mapped to a constant value. |
| * This allows default values to be provided for un-mapped fields. |
| * @see FieldTransformer |
| * @author James Sutherland |
| * @since 10.1.3 |
| */ |
| public class ConstantTransformer extends FieldTransformerAdapter { |
| protected Object value; |
| |
| public ConstantTransformer() { |
| super(); |
| } |
| |
| /** |
| * PUBLIC: |
| * Return a constant transformer for the constant value. |
| */ |
| public ConstantTransformer(Object value) { |
| this.value = value; |
| } |
| |
| /** |
| * PUBLIC: |
| * Return the value of the constant. |
| */ |
| public Object getValue() { |
| return value; |
| } |
| |
| /** |
| * PUBLIC: |
| * Set the value of the constant. |
| */ |
| public void setValue(Object value) { |
| this.value = value; |
| } |
| |
| /** |
| * INTERNAL: |
| * Always return the constant value. |
| */ |
| @Override |
| public Object buildFieldValue(Object object, String fieldName, Session session) { |
| return value; |
| } |
| } |