content: /**
   * 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,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.fernandocejas.arrow.functions;
  
  import org.jetbrains.annotations.Nullable;
  
  /**
   * Determines a true or false value for a given input.
   *
   * <p>The {@link Predicates} class provides common predicates and related utilities.
   *
   * <p>See the Guava User Guide article on <a href=
   * "http://code.google.com/p/guava-libraries/wiki/FunctionalExplained">the use of {@code
   * Predicate}</a>.
   *
   * @author Kevin Bourrillion
   * @since 2.0 (imported from Google Collections Library)
   */
  public interface Predicate<T> {
    /**
     * Returns the result of applying this predicate to {@code input}. This method is <i>generally
     * expected</i>, but not absolutely required, to have the following properties:
     *
     * <ul>
     * <li>Its execution does not cause any observable side effects.
     * <li>The computation is <i>consistent with equals</i>.
     * Objects.equal}{@code (a, b)} implies that {@code predicate.apply(a) ==
     * predicate.apply(b))}.
     * </ul>
     *
     * @throws NullPointerException if {@code input} is null and this predicate does not accept null
     * arguments
     */
    boolean apply(@Nullable T input);
  
    /**
     * Indicates whether another object is equal to this predicate.
     *
     * <p>Most implementations will have no reason to override the behavior of {@link Object#equals}.
     * However, an implementation may also choose to return {@code true} whenever {@code object} is a
     * {@link Predicate} that it considers <i>interchangeable</i> with this one. "Interchangeable"
     * <i>typically</i> means that {@code this.apply(t) == that.apply(t)} for all {@code t} of type
     * {@code T}). Note that a {@code false} result from this method does not imply that the
     * predicates are known <i>not</i> to be interchangeable.
     */
    @Override boolean equals(@Nullable Object object);
  }
  