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

There is a newer version: 1.10.0

package com.dslplatform.json.runtime;

import com.dslplatform.json.DslJson;
import com.dslplatform.json.JsonReader;
import com.dslplatform.json.JsonWriter;
import com.dslplatform.json.SerializationException;

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

public final class OptionalEncoder implements JsonWriter.WriteObject> {

	private final DslJson json;
	private final JsonWriter.WriteObject optWriter;

	public OptionalEncoder(
			final DslJson json,
			final JsonWriter.WriteObject writer) {
		if (json == null) throw new IllegalArgumentException("json can't be null");
		this.json = json;
		this.optWriter = writer;
	}

	@Override
	public void write(JsonWriter writer, Optional value) {
		if (value == null || !value.isPresent()) writer.writeNull();
		else if (optWriter != null) optWriter.write(writer, value.get());
		else {
			final T unpacked = value.get();
			if (unpacked == null) writer.writeNull();
			else {
				final JsonWriter.WriteObject jw = json.tryFindWriter(unpacked.getClass());
				if (jw == null) throw new SerializationException("Unable to find writer for " + unpacked.getClass());
				jw.write(writer, unpacked);
			}
		}
	}
}