}

    /**
     * Stores (inserts or updates) a duplicate host configuration.
     *
     * <p>This method immediately refreshes the index to ensure the change is visible.
     * If the configuration already exists (based on ID), it will be updated;
     * otherwise, a new configuration will be created.</p>
     *
     * @param duplicateHost the duplicate host configuration to store

            @Override
            public void hook(final FwAssistantDirector assistantDirector) {
                try {
                    // Simulate a scenario where the method exists but invocation fails
                    Class<?> clazz = MockMultiThreadedHttpConnectionManager.class;
                    Method method = clazz.getMethod("shutdownAll", (Class<?>[]) null);

</div>

This means that it will **always have a value**, it's just that sometimes the value could be `None` (or `null` in JSON).

That means that, clients using your API don't have to check if the value exists or not, they can **assume the field will always be there**, but just that in some cases it will have the default value of `None`.

    <example>
      ${fe:base64(value)}
    </example>
  </function>

  <function>
    <description>
      Check if a file exists.
    </description>
    <name>fileExists</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>boolean fileExists(java.lang.String)</function-signature>
    <example>

  public TreeTraverser() {}

  /**
   * Returns a tree traverser that uses the given function to navigate from a node to its children.
   * This is useful if the function instance already exists, or so that you can supply a lambda
   * expressions. If those circumstances don't apply, you probably don't need to use this; subclass
   * {@code TreeTraverser} and implement its {@link #children} method directly.
   *

    /*
     * Open the file or fail if it does not exist
     * aka OPEN_EXISTING
     */

    static final int FILE_OPEN = 0x1;

    /*
     * Create the file or fail if it does not exist
     * aka CREATE_NEW
     */

    static final int FILE_CREATE = 0x2;

    /*
     * Open the file or create it if it does not exist
     * aka OPEN_ALWAYS
     */

    throw new InvalidObjectException("Use SerializedForm");
  }

  /**
   * Not supported. Use {@link #toImmutableBiMap} instead. This method exists only to hide {@link
   * ImmutableMap#toImmutableMap(Function, Function)} from consumers of {@code ImmutableBiMap}.
   *
   * @throws UnsupportedOperationException always

        if ((flags & SmbConstants.O_CREAT) == SmbConstants.O_CREAT) {
            // create it if necessary
            if ((flags & SmbConstants.O_EXCL) == SmbConstants.O_EXCL) {
                // fail if already exists
                this.openFunction = OPEN_FN_CREATE | OPEN_FN_FAIL_IF_EXISTS;
            } else {
                this.openFunction = OPEN_FN_CREATE | OPEN_FN_OPEN;
            }
        } else {

    return Float.hashCode(value);
  }

  /**
   * Compares the two specified {@code float} values using {@link Float#compare(float, float)}. You
   * may prefer to invoke that method directly; this method exists only for consistency with the
   * other utilities in this package.
   *
   * <p><b>Note:</b> this method simply delegates to the JDK method {@link Float#compare}. It is

     *
     * <p>This method encrypts sensitive handler parameters before storing
     * and immediately refreshes the index to ensure the change is visible.
     * If the configuration already exists (based on ID), it will be updated;
     * otherwise, a new configuration will be created.</p>
     *
     * @param dataConfig the data configuration to store
     * @throws IllegalArgumentException if dataConfig is null