org.eclipse.persistence.internal.helper.JPAConversionManager 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
The newest version!
/*
 * Copyright (c) 1998, 2021 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.internal.helper;

/**
 * 
 * Purpose: Extension to the existing conversion manager to support the
 * EJB 3.0 spec.
 * 

 * Responsibilities:
 * 

 *  Allow a null value default to be read into primitives. With the current
 * conversion manager, setting a null into a primitive causes and exception.
 * This conversion manager was added to avoid that exception and therefore, add
 * support for schemas that were built before the object model was mapped
 * (using a primitive). Therefore, EclipseLink will not change the null column value
 * in the database through this conversion. The value on the database will only
 * be changed if the user actually sets a new primitive value.
 * 
 Allows users to define their own set of default null values to be used
 * in the conversion.
 * 
 *
 * @author Guy Pelletier
 * @since TopLink 10.1.4 RI
 */
public class JPAConversionManager extends ConversionManager {
    public JPAConversionManager() {
        super();
    }

    /**
     * INTERNAL:
     */
    @Override
    public  T getDefaultNullValue(Class theClass) {
        Object defaultNullValue = null;
        if (this.defaultNullValues != null){
            defaultNullValue = getDefaultNullValues().get(theClass);
        }
        if (defaultNullValue == null && theClass.isPrimitive()) {
            if(Double.TYPE.equals(theClass)){
                return (T) Double.valueOf(0D);
            }  else if(Long.TYPE.equals(theClass)) {
                return (T) Long.valueOf(0L);
            } else if(Character.TYPE.equals(theClass)){
                return (T) Character.valueOf('\u0000');
            } else if(Float.TYPE.equals(theClass)){
                return (T)  Float.valueOf(0F);
            } else if(Short.TYPE.equals(theClass)){
                return (T) Short.valueOf((short) 0);
            } else if(Byte.TYPE.equals(theClass)){
                return (T)  Byte.valueOf((byte) 0);
            } else if(Boolean.TYPE.equals(theClass)){
                return (T) Boolean.FALSE;
            } else {
                return (T) Integer.valueOf(0);
            }
        } else {
            return (T) defaultNullValue;
        }
    }
}