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A SpringBoot Starter solution designed to ensure easy and efficient integration with the Elrond Network using a Reactive API layer.

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package software.crldev.elrondspringbootstarterreactive.domain.transaction;

import software.crldev.elrondspringbootstarterreactive.error.exception.CannotCreateSignatureException;
import software.crldev.elrondspringbootstarterreactive.error.exception.SignatureEmptyException;
import software.crldev.elrondspringbootstarterreactive.util.HexValidator;
import org.bouncycastle.util.encoders.Hex;
import java.util.Arrays;
import static software.crldev.elrondspringbootstarterreactive.config.constants.TransactionConstants.SIGNATURE_LENGTH;
import static software.crldev.elrondspringbootstarterreactive.config.constants.TransactionConstants.SIGNATURE_LENGTH_HEX;

/**
 * Value object for Signature
 *
 * @author carlo_stanciu
 */
public final class Signature {
    private final String hex;

    private Signature(String hex) {
        this.hex = hex;
    }

    /**
     * used for creating an Signature using
     * a hex representation of an Signable object
     *
     * @param hexValue - hex value of Signable object buffer
     * @return - an instance of Signature
     */
    public static Signature fromHex(String hexValue) {
        if (!HexValidator.isHexValid(hexValue, SIGNATURE_LENGTH_HEX)) throw new CannotCreateSignatureException(hexValue);
        return new Signature(hexValue);
    }

    /**
     * used for creating an Signature using
     * a buffer representation of an Signable object
     *
     * @param buffer - buffer of Signable object buffer
     * @return - an instance of Signature
     */
    public static Signature fromBuffer(byte[] buffer) {
        if (buffer.length != SIGNATURE_LENGTH) throw new CannotCreateSignatureException(Arrays.toString(buffer));
        return new Signature(Hex.toHexString(buffer));
    }

    /**
     * Creates an empty Signature
     *
     * @return - an instance of Signature
     */
    public static Signature empty() {
        return new Signature("");
    }

    /**
     * Getter
     * Throws exception if empty
     *
     * @return - hex value of the Signature
     */
    public String getHex() {
        if (isEmpty()) throw new SignatureEmptyException();
        return hex;
    }

    /**
     * Checks if Signature is empty
     *
     * @return - boolean
     */
    public boolean isEmpty() {
        return hex.isEmpty();
    }

    @Override
    public boolean equals(final Object o) {
        if (o == this) return true;
        if (!(o instanceof Signature)) return false;
        final Signature other = (Signature) o;
        final Object this$hex = this.getHex();
        final Object other$hex = other.getHex();
        if (this$hex == null ? other$hex != null : !this$hex.equals(other$hex)) return false;
        return true;
    }

    @Override
    public int hashCode() {
        final int PRIME = 59;
        int result = 1;
        final Object $hex = this.getHex();
        result = result * PRIME + ($hex == null ? 43 : $hex.hashCode());
        return result;
    }

    @Override
    public String toString() {
        return "Signature(hex=" + this.getHex() + ")";
    }
}