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# GVariant for Java
This library provides a [GVariant][] parser in pure Java.
## Overview
The two foundational classes are `Value` and `Decoder`.
`Value` is a sum type (sealed interface) that represents a
[GVariant][] value. Its subtypes represent the different types of
values that [GVariant][] supports.
Instances of `Decoder` read a given concrete subtype of `Value` from a
[ByteBuffer][]. The class also contains factory methods to create
those instances.
The various subclasses of `Decoder` together implement the [GVariant
serialization][] specification.
## Example
To parse a [GVariant][] value of type `"a(si)"`, which is an array of
pairs of [String][] and `int`, you can use the following code:
record ExampleRecord(String s, int i) {}
var decoder =
Decoder.ofArray(
Decoder.ofStructure(
ExampleRecord.class,
Decoder.ofString(StandardCharsets.UTF_8),
Decoder.ofInt().withByteOrder(ByteOrder.LITTLE_ENDIAN)));
byte[] bytes = ...;
List<ExampleRecord> example = decoder.decode(ByteBuffer.wrap(bytes));
[ByteBuffer]: https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/nio/ByteBuffer.html
[GVariant]: https://docs.gtk.org/glib/struct.Variant.html
[GVariant serialization]: https://people.gnome.org/~desrt/gvariant-serialisation.pdf
[String]: https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html
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