storage-units-eclipselink/src/main/java/wtf/metio/storageunits/eclipselink/AbstractStorageUnitConverter.java

   1 /*
   2  * SPDX-FileCopyrightText: The Storage-Units Authors
   3  * SPDX-License-Identifier: 0BSD
   4  */
   5 package wtf.metio.storageunits.eclipselink;
   6
   7 import org.eclipse.persistence.internal.helper.DatabaseField;
   8 import org.eclipse.persistence.mappings.DatabaseMapping;
   9 import org.eclipse.persistence.mappings.DirectCollectionMapping;
  10 import org.eclipse.persistence.mappings.converters.Converter;
  11 import org.eclipse.persistence.sessions.Session;
  12 import wtf.metio.storageunits.model.StorageUnit;
  13
  14 import java.io.Serial;
  15 import java.math.BigInteger;
  16
  17 /**
  18  * Abstract implementation of a EclipseLink {@link Converter} for {@link StorageUnit StorageUnits}.
  19  *
  20  * @see <a href=
  21  * "https://www.eclipse.org/eclipselink/documentation/2.6/jpa/extensions/annotations_ref.htm#CHDEHJEB">EclipseLink
  22  * documentation</a>
  23  */
  24 abstract class AbstractStorageUnitConverter implements Converter {
  25
  26     @Serial
  27     private static final long serialVersionUID = 1696764872656233871L;
  28
  29     @Override
  30     public Object convertObjectValueToDataValue(final Object objectValue, final Session session) {
  31         return ((StorageUnit<?>) objectValue).inByte();
  32     }
  33
  34     @Override
  35     public Object convertDataValueToObjectValue(final Object dataValue, final Session session) {
  36         return convertToStorageUnit(new BigInteger(dataValue.toString()));
  37     }
  38
  39     protected abstract StorageUnit<?> convertToStorageUnit(BigInteger value);
  40
  41     @Override
  42     public boolean isMutable() {
  43         return false;
  44     }
  45
  46     @Override
  47     public void initialize(final DatabaseMapping mapping, final Session session) {
  48         final DatabaseField field;
  49         if (mapping instanceof DirectCollectionMapping) {
  50             field = ((DirectCollectionMapping) mapping).getDirectField();
  51         } else {
  52             field = mapping.getField();
  53         }
  54         field.setSqlType(java.sql.Types.BIGINT);
  55     }
  56
  57 }