ByteDecoder.java

/*
 * SPDX-FileCopyrightText: 2023-2025 Lucimber UG
 * SPDX-License-Identifier: Apache-2.0
 */
package com.lucimber.dbus.codec.decoder;

import com.lucimber.dbus.type.DBusByte;
import com.lucimber.dbus.util.LoggerUtils;
import java.nio.ByteBuffer;
import java.util.Objects;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A decoder which unmarshals a byte from the byte stream format used by D-Bus.
 *
 * @see Decoder
 * @see DBusByte
 */
public final class ByteDecoder implements Decoder<ByteBuffer, DBusByte> {

    private static final Logger LOGGER = LoggerFactory.getLogger(ByteDecoder.class);

    @Override
    public DecoderResult<DBusByte> decode(ByteBuffer buffer, int offset) {
        Objects.requireNonNull(buffer, "buffer must not be null");
        try {
            int consumedBytes = 1;

            byte rawValue = buffer.get();
            DBusByte value = DBusByte.valueOf(rawValue);

            DecoderResult<DBusByte> result = new DecoderResultImpl<>(consumedBytes, value);

            LOGGER.debug(
                    LoggerUtils.MARSHALLING,
                    "BYTE: {}; Offset: {}; Padding: {}; Consumed bytes: {};",
                    value,
                    offset,
                    0,
                    result.getConsumedBytes());

            return result;
        } catch (Throwable t) {
            throw new DecoderException("Could not decode BYTE.", t);
        }
    }
}