/**
 * SwitchableHttpClient is a switchable HTTP client that can use either Apache HttpComponents 4.x or 5.x.
 * The client implementation is selected based on the system property {@code fess.crawler.http.client}.
 *
 * <p>Supported values:</p>
 * <ul>
 *   <li>{@code hc4} - Use Apache HttpComponents 4.x ({@link Hc4HttpClient})</li>
 *   <li>{@code hc5} or not set - Use Apache HttpComponents 5.x ({@link Hc5HttpClient}) - default</li>
 * </ul>

 *
 * <p>Most subclasses can just use {@link SimpleForwardingListenableFuture}.
 *
 * @author Shardul Deo
 * @since 4.0
 */
@GwtCompatible
public abstract class ForwardingListenableFuture<V extends @Nullable Object>
    extends ForwardingFuture<V> implements ListenableFuture<V> {

  /** Constructor for use by subclasses. */
  protected ForwardingListenableFuture() {}

  @Override

    }

    /**
     * Escapes special characters in a value for use in LDAP search filters.
     * This method escapes characters that have special meaning in LDAP filter expressions
     * to prevent LDAP injection attacks.
     *
     * @param value the value to escape (null is treated as empty string)
     * @return the escaped value safe for use in LDAP search filters

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License

   *
   * @throws UnsupportedOperationException always
   * @deprecated Use {@link ImmutableSortedSet#toImmutableSortedSet}.
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @DoNotCall("Use toImmutableSortedSet")
  @Deprecated
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  public static <E> Collector<E, ?, ImmutableSet<E>> toImmutableSet() {

 *  Fix: Timeouts throw `SocketTimeoutException`, not `InterruptedIOException`.
 *  Fix: Change `MockWebServer` to use the same logic as OkHttp when determining
    whether an HTTP request permits a body.
 *  Fix: `HttpUrl` now uses the canonical form for IPv6 addresses.
 *  Fix: Use `HttpUrl` internally.
 *  Fix: Recover from Android 4.2.2 EBADF crashes.
 *  Fix: Don't crash with an `IllegalStateException` if an HTTP/2 or SPDY

  /**
   * Returns the unsigned {@code int} value represented by a string with the given radix.
   *
   * <p><b>Java 8+ users:</b> use {@link Integer#parseUnsignedInt(String, int)} instead.
   *
   * @param string the string containing the unsigned integer representation to be parsed.
   * @param radix the radix to use while parsing {@code s}; must be between {@link
   *     Character#MIN_RADIX} and {@link Character#MAX_RADIX}.

It's all based on standard **Python type** declarations (thanks to Pydantic). No new syntax to learn. Just standard modern Python.

If you need a 2 minute refresher of how to use Python types (even if you don't use FastAPI), check the short tutorial: [Python Types](python-types.md).

You write standard Python with types:

```Python
from datetime import date

from pydantic import BaseModel

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,