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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.esdt.common;

import org.bouncycastle.util.encoders.Hex;
import software.crldev.elrondspringbootstarterreactive.error.ErrorMessage;
import java.util.Arrays;
import java.util.Set;
import java.util.stream.Collectors;
import static io.netty.util.internal.StringUtil.isNullOrEmpty;

/**
 * Value object for ESDT token attributes
 *
 * @author carlo_stanciu
 */
public final class TokenAttributes {
    private final ESDTUri metadataUri;
    private final Set tags;

    private TokenAttributes(ESDTUri metadataUri, Set tags) {
        this.metadataUri = metadataUri;
        this.tags = tags;
    }

    /**
     * Creates a TokenName object from String inputs
     *
     * @return - an instance of TokenAttributes
     */
    public static TokenAttributes fromString(String metadata, String[] tags) {
        verifyNullEmpty(tags);
        var tagsW = Arrays.stream(tags).map(TokenAttributes::removeWhitespace).collect(Collectors.toSet());
        return new TokenAttributes(ESDTUri.fromString(metadata, ESDTUri.Type.METADATA), tagsW);
    }

    /**
     * Getter
     *
     * @return - hex value of the Token Attributes
     */
    public String getHex() {
        return Hex.toHexString(toString().getBytes());
    }

    /**
     * Returns the value
     *
     * @return - value in String format
     */
    @Override
    public String toString() {
        return "metadata:" + metadataUri.getValue() + ";tags:" + String.join(",", tags);
    }

    private static String removeWhitespace(String value) {
        return value.replaceAll("\\s+", "");
    }

    private static void verifyNullEmpty(String... value) {
        if (value == null || value.length == 0) throw new IllegalArgumentException(ErrorMessage.TOKEN_ATTRIBUTES.getValue());
        Arrays.stream(value).forEach(v -> {
            if (isNullOrEmpty(v)) throw new IllegalArgumentException(ErrorMessage.TOKEN_ATTRIBUTES.getValue());
        });
    }

    public ESDTUri getMetadataUri() {
        return this.metadataUri;
    }

    public Set getTags() {
        return this.tags;
    }

    @Override
    public boolean equals(final Object o) {
        if (o == this) return true;
        if (!(o instanceof TokenAttributes)) return false;
        final TokenAttributes other = (TokenAttributes) o;
        final Object this$metadataUri = this.getMetadataUri();
        final Object other$metadataUri = other.getMetadataUri();
        if (this$metadataUri == null ? other$metadataUri != null : !this$metadataUri.equals(other$metadataUri)) return false;
        final Object this$tags = this.getTags();
        final Object other$tags = other.getTags();
        if (this$tags == null ? other$tags != null : !this$tags.equals(other$tags)) return false;
        return true;
    }

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