import org.codelibs.fess.mylasta.action.FessUserBean;
import org.lastaflute.web.login.credential.LoginCredential;
import org.lastaflute.web.response.ActionResponse;

/**
 * Interface for SSO (Single Sign-On) authenticator implementations.
 *
 * This interface defines the contract for SSO authentication providers that can be
 * integrated with Fess. Implementations handle specific SSO protocols like SAML,

import org.jspecify.annotations.Nullable;

/**
 * Extracts non-overlapping substrings from an input string, typically by recognizing appearances of
 * a <i>separator</i> sequence. This separator can be specified as a single {@linkplain #on(char)
 * character}, fixed {@linkplain #on(String) string}, {@linkplain #onPattern regular expression} or
 * {@link #on(CharMatcher) CharMatcher} instance. Or, instead of using a separator at all, a

   * {@code ExecutorService} imposes a small locking overhead on each task submission in order to
   * implement shutdown and termination behavior.
   *
   * <p>Because of the nature of single-thread execution, the methods {@code scheduleAtFixedRate}
   * and {@code scheduleWithFixedDelay} are not supported by this class and will throw an
   * UnsupportedOperationException.
   *

  }

  /**
   * Replaces the existing container under test with a new container. This is useful when a single
   * test method needs to create multiple containers while retaining the ability to use {@link
   * #expectContents(Object[]) expectContents(E...)} and other convenience methods. The creation of
   * multiple containers in a single method is discouraged in most cases, but it is vital to the
   * iterator tests.
   *

          public void onFailure(Throwable t) {}
        },
        directExecutor());
    return closingFuture;
  }

  /**
   * Starts specifying how to combine {@link ClosingFuture}s into a single pipeline.
   *
   * @throws IllegalStateException if a {@code ClosingFuture} has already been derived from any of
   *     the {@code futures}, or if any has already been {@linkplain #finishToFuture() finished}
   */

    assertEquals(20, counter.skip(30));
    assertEquals(20, counter.getCount());
    assertEquals(0, counter.skip(20));
    assertEquals(20, counter.getCount());

    // Test reading a single byte while we're in the right state
    assertEquals(-1, counter.read());
    assertEquals(20, counter.getCount());
  }

  public void testReadArrayEOF() throws IOException {

mvn jdeb:jdeb           # Build .deb package
```

### Testing
```bash
mvn test                                    # Run unit tests (*Test.java)
mvn test -Dtest=ClassName                   # Run single unit test

# To install fess jar for plugin dependency resolution:
# Change pom.xml <packaging>war</packaging> to <packaging>jar</packaging> first
mvn clean install -DskipTests               # Then revert packaging back to war

/**
 * Parse RFC 7235 challenges. This is awkward because we need to look ahead to know how to
 * interpret a token.
 *
 * For example, the first line has a parameter name/value pair and the second line has a single
 * token68:
 *
 * ```
 * WWW-Authenticate: Digest foo=bar
 * WWW-Authenticate: Digest foo=
 * ```
 *
 * Similarly, the first line has one challenge and the second line has two challenges:
 *
 * ```

  @SuppressWarnings("unchecked")
  public static <B> ImmutableClassToInstanceMap<B> of() {
    return (ImmutableClassToInstanceMap<B>) EMPTY;
  }

  /**
   * Returns an {@code ImmutableClassToInstanceMap} containing a single entry.
   *
   * @since 19.0
   */
  public static <B, T extends B> ImmutableClassToInstanceMap<B> of(Class<T> type, T value) {
    return new ImmutableClassToInstanceMap<>(ImmutableMap.of(type, value));
  }

import org.lastaflute.web.login.exception.LoginFailureException;
import org.lastaflute.web.response.ActionResponse;
import org.lastaflute.web.response.HtmlResponse;

/**
 * SSO (Single Sign-On) action controller.
 *
 * This action handles SSO authentication flows including login, logout, and metadata
 * operations. It coordinates with the SsoManager to perform authentication using