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DSL Platform compatible Java JSON library (https://dsl-platform.com)

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package com.dslplatform.json.runtime;

import com.dslplatform.json.JsonReader;

import java.io.IOException;
import java.util.Optional;

public final class OptionalDecoder implements JsonReader.ReadObject> {

	private final JsonReader.ReadObject decoder;

	public OptionalDecoder(final JsonReader.ReadObject decoder) {
		if (decoder == null) throw new IllegalArgumentException("decoder can't be null");
		this.decoder = decoder;
	}

	@Override
	public Optional read(JsonReader reader) throws IOException {
		if (reader.wasNull()) return Optional.empty();
		return Optional.ofNullable(decoder.read(reader));
	}
}