001/*
002 * Copyright 2023 the original author or authors.
003 * <p>
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * https://www.apache.org/licenses/LICENSE-2.0
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package de.cuioss.test.valueobjects.util;
017
018import static de.cuioss.tools.string.MoreStrings.isEmpty;
019
020import de.cuioss.test.generator.Generators;
021import lombok.experimental.UtilityClass;
022
023/**
024 * Simple Helper that shuffle lower / uppercase for strings.
025 *
026 * @author Oliver Wolff
027 *
028 */
029@UtilityClass
030public class StringCaseShuffler {
031
032    /**
033     * Shuffles the case of a given string. Shuffling is done for every Character
034     * that is a {@link Character#isAlphabetic(int)}
035     *
036     * @param toShuffle if {@code null} or empty the given String will be returned
037     * @return the shuffled string
038     */
039    public static String shuffleCase(String toShuffle) {
040        if (isEmpty(toShuffle)) {
041            return toShuffle;
042        }
043        var result = new StringBuilder();
044        for (char c : toShuffle.toCharArray()) {
045            result.append(handleSingleCharacter(c));
046        }
047        return result.toString();
048    }
049
050    private static char handleSingleCharacter(char c) {
051        if (!Character.isAlphabetic(c)) {
052            return c;
053        }
054        if (Generators.booleans().next().booleanValue()) {
055            return Character.toUpperCase(c);
056        }
057        return Character.toLowerCase(c);
058    }
059}