@Documented
@Constraint(validatedBy = UriTypeValidator.class)
public @interface UriType {

    /**
     * Specifies the protocol type to validate against.
     *
     * @return the protocol type
     */
    ProtocolType protocolType();

    /**
     * The validation error message.
     *
     * @return the error message
     */
    String message() default "{org.lastaflute.validator.constraints.UriType.message}";

    /**

    public void initialize(final UriType uriType) {
        protocols = switch (uriType.protocolType()) {
        case WEB -> ComponentUtil.getProtocolHelper().getWebProtocols();
        case FILE -> ComponentUtil.getProtocolHelper().getFileProtocols();
        default -> throw new ConstraintDefinitionException("protocolType is empty or invalid: " + uriType.protocolType());
        };
    }

    @Override

    @Size(max = 1000)
    public String description;

    /** The file paths to crawl (required, must be valid file URIs). */
    @Required
    @UriType(protocolType = ProtocolType.FILE)
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String paths;

    /** The paths to include during crawling (pattern-based). */
    @CustomSize(maxKey = "form.admin.max.input.size")

     */
    @Size(max = 1000)
    public String description;

    /**
     * The URLs to be crawled by this web configuration.
     */
    @Required
    @UriType(protocolType = ProtocolType.WEB)
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String urls;

    /**
     * URL patterns to include during crawling.
     */
    @CustomSize(maxKey = "form.admin.max.input.size")

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    public static final String PROTOCOL_TYPE = "file";

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    public static final String PROTOCOL_TYPE = "web";

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    public static final String PROTOCOL_TYPE = "test";

    @Override
    protected URLConnection openConnection(URL u) throws IOException {
        return null;
    }