/** List of duplicate host rules for URL conversion */
    protected List<DuplicateHost> duplicateHostList;

    /**
     * Default constructor for DuplicateHostHelper.
     * Creates a new duplicate host helper instance.
     */
    public DuplicateHostHelper() {
        // Default constructor
    }

    /**
     * Initializes the duplicate host helper after construction.

/**
 * The search form for Duplicate Host.
 */
public class SearchForm {

    /**
     * Default constructor for SearchForm.
     */
    public SearchForm() {
    }

    /**
     * The regular name field for duplicate host configuration.
     */
    public String regularName;

    /**
     * The duplicate host name field for searching duplicate hosts.
     */

    public final E[] elements;
    public final E duplicate;

    private ArrayWithDuplicate(E[] elements, E duplicate) {
      this.elements = elements;
      this.duplicate = duplicate;
    }
  }

  /**
   * @return an array of the proper size with a duplicate element. The size must be at least three.
   */

    /**
     * Displays the initial duplicate host management page.
     *
     * @param form the search form
     * @return HTML response for the duplicate host list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        return asListHtml();
    }

    /**
     * Displays the duplicate host list with pagination.
     *

/**
 * Pager for duplicate host management with standard paging functionality.
 * This class provides pagination support for duplicate host listings in the admin interface,
 * including navigation controls and search/filter parameters.
 *
 * <p>Duplicate hosts allow administrators to define hostname patterns that should
 * be treated as equivalent during crawling, helping to avoid duplicate content

import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.Size;

/**
 * Form class for creating new duplicate host configuration entries.
 * This form handles the creation of duplicate host mappings that redirect
 * crawling from duplicate hostnames to the regular canonical hostname.
 */
public class CreateForm {

    /**
     * Creates a new CreateForm instance.
     */

import jakarta.validation.constraints.Size;

/**
 * Form class for editing duplicate host configurations in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing duplicate host entries,
 * including tracking information for optimistic locking and audit trails.
 * Duplicate hosts are used to define which domains should be treated as the same site for crawling purposes.
 *
 */

/**
 * Service class for managing duplicate host configuration CRUD operations.
 * This service provides functionality to create, read, update, and delete
 * duplicate host configurations used by the Fess crawler system.
 *
 * <p>Duplicate host configurations allow administrators to define hostname patterns
 * that should be treated as equivalent during crawling. This helps avoid indexing

import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin duplicate host management.
 * Provides RESTful API endpoints for managing duplicate host settings in the Fess search engine.
 * Duplicate host settings help prevent indexing the same content from multiple similar URLs.
 *
 */
public class ApiAdminDuplicatehostAction extends FessApiAdminAction {

    collection = getSubjectGenerator().create(arrayAndDuplicate.elements);
    E duplicate = arrayAndDuplicate.duplicate;

    assertTrue(
        "removeAll(intersectingCollection) should return true",
        getList().removeAll(MinimalCollection.of(duplicate)));
    assertFalse(
        "after removeAll(e), a collection should not contain e even "