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more impressive converter example

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Gavin 2023-05-10 20:07:33 +02:00 committed by Christian Beikov
parent 4697630eb9
commit e59ba209da
1 changed files with 19 additions and 5 deletions
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24
documentation/src/main/asciidoc/introduction/Entities.adoc
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@ -591,15 +591,29 @@ For example, the following converter will be automatically applied to any attrib
[source,java] [source,java]
---- ----
@Converter(autoApply = true) @Converter(autoApply = true)
public class BitSetConverter implements AttributeConverter<BitSet,byte[]> { public static class EnumSetConverter implements AttributeConverter<EnumSet<DayOfWeek>,Integer> {
@Override @Override
public byte[] convertToDatabaseColumn(BitSet bitSet) { public Integer convertToDatabaseColumn(EnumSet<DayOfWeek> enumSet) {
return bitSet.toByteArray(); int encoded = 0;
DayOfWeek[] values = DayOfWeek.values();
for (int i = 0; i<values.length; i++) {
if (enumSet.contains(values[i])) {
encoded |= 1<<i;
}
}
return encoded;
} }
@Override @Override
public BitSet convertToEntityAttribute(byte[] bytes) { public EnumSet<DayOfWeek> convertToEntityAttribute(Integer encoded) {
return BitSet.valueOf(bytes); EnumSet<DayOfWeek> set = EnumSet.noneOf(DayOfWeek.class);
DayOfWeek[] values = DayOfWeek.values();
for (int i = 0; i<values.length; i++) {
if (((1<<i) & encoded) != 0) {
set.add(values[i]);
}
}
return set;
} }
} }
---- ----