001    /*
002     * Created on Jul 25, 2010
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
005     * the License. You may obtain a copy of the License at
006     *
007     * http://www.apache.org/licenses/LICENSE-2.0
008     *
009     * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
010     * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
011     * specific language governing permissions and limitations under the License.
012     *
013     * Copyright @2010-2011 the original author or authors.
014     */
015    package org.fest.assertions.core;
016    
017    /**
018     * Assertions applicable to groups of values that can be enumerated (e.g. arrays, collections or strings.)
019     * @param <S> the "self" type of this assertion class. Please read
020     * &quot;<a href="http://bit.ly/anMa4g" target="_blank">Emulating 'self types' using Java Generics to simplify fluent
021     * API implementation</a>&quot; for more details.
022     *
023     * @author Yvonne Wang
024     * @author Alex Ruiz
025     */
026    public interface EnumerableAssert<S> {
027    
028      /**
029       * Verifies that the actual group of values is {@code null} or empty.
030       * @throws AssertionError if the actual group of values is not {@code null} or not empty.
031       */
032      void isNullOrEmpty();
033    
034      /**
035       * Verifies that the actual group of values is empty.
036       * @throws AssertionError if the actual group of values is not empty.
037       */
038      void isEmpty();
039    
040      /**
041       * Verifies that the actual group of values is not empty.
042       * @return {@code this} assertion object.
043       * @throws AssertionError if the actual group of values is empty.
044       */
045      S isNotEmpty();
046    
047      /**
048       * Verifies that the number of values in the actual group is equal to the given one.
049       * @param expected the expected number of values in the actual group.
050       * @return {@code this} assertion object.
051       * @throws AssertionError if the number of values of the actual group is not equal to the given one.
052       */
053      S hasSize(int expected);
054    }