40 lines
1.1 KiB
Kotlin
40 lines
1.1 KiB
Kotlin
package ch.dissem.apps.abit.util
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import java.nio.ByteBuffer
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import java.util.UUID
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/**
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* SQLite has no UUID data type, and UUIDs are therefore best saved as BINARY[16]. This class
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* takes care of conversion between byte[16] and UUID.
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*
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*
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* Thanks to Brice Roncace on
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* [
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* Stack Overflow
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](http://stackoverflow.com/questions/17893609/convert-uuid-to-byte-that-works-when-using-uuid-nameuuidfrombytesb) *
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* for providing the UUID <-> byte[] conversions.
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*
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*/
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object UuidUtils {
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/**
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* @param bytes that represent a UUID, or null for a random UUID
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* @return the UUID from the given bytes, or a random UUID if bytes is null.
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*/
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fun asUuid(bytes: ByteArray?): UUID {
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if (bytes == null) {
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return UUID.randomUUID()
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}
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val bb = ByteBuffer.wrap(bytes)
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val firstLong = bb.long
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val secondLong = bb.long
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return UUID(firstLong, secondLong)
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}
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fun asBytes(uuid: UUID): ByteArray {
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val bb = ByteBuffer.wrap(ByteArray(16))
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bb.putLong(uuid.mostSignificantBits)
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bb.putLong(uuid.leastSignificantBits)
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return bb.array()
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}
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}
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