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Date: Mon, 12 Jun 2017 12:45:00 +0000 (UTC)
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Subject: [jira] [Commented] (TEXT-85) Create CaseUtils class. Add
 toCamelCase
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archived-at: Mon, 12 Jun 2017 12:45:09 -0000


    [ https://issues.apache.org/jira/browse/TEXT-85?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16046516#comment-16046516 ] 

ASF GitHub Bot commented on TEXT-85:
------------------------------------

Github user chtompki commented on a diff in the pull request:

    https://github.com/apache/commons-text/pull/46#discussion_r121380327
  
    --- Diff: src/main/java/org/apache/commons/text/CaseUtils.java ---
    @@ -0,0 +1,140 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You 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 org.apache.commons.text;
    +
    +import org.apache.commons.lang3.StringUtils;
    +
    +import java.util.HashSet;
    +import java.util.Set;
    +
    +/**
    + * <p>Case manipulation operations on Strings that contain words.</p>
    + *
    + * <p>This class tries to handle <code>null</code> input gracefully.
    + * An exception will not be thrown for a <code>null</code> input.
    + * Each method documents its behaviour in more detail.</p>
    + *
    + * @since 1.0
    + */
    +public class CaseUtils {
    +
    +    /**
    +     * <p><code>CaseUtils</code> instances should NOT be constructed in
    +     * standard programming. Instead, the class should be used as
    +     * <code>CaseUtils.toCamelCase("foo bar", true, new char[]{'-'});</code>.</p>
    +     * <p>
    +     * <p>This constructor is public to permit tools that require a JavaBean
    +     * instance to operate.</p>
    +     */
    +    public CaseUtils() {
    +        super();
    +    }
    +
    +    // Camel Case
    +    //-----------------------------------------------------------------------
    +    /**
    +     * <p>Converts all the delimiter separated words in a String into camelCase,
    +     * that is each word is made up of a titlecase character and then a series of
    +     * lowercase characters. The  </p>
    +     *
    +     * <p>The delimiters represent a set of characters understood to separate words.
    +     * The first non-delimiter character after a delimiter will be capitalized. The first String
    +     * character may or may not be capitalized and it's determined by the user input for capitalizeFirstLetter
    +     * variable.</p>
    +     *
    +     * <p>A <code>null</code> input String returns <code>null</code>.
    +     * Capitalization uses the Unicode title case, normally equivalent to
    +     * upper case.</p>
    +     *
    +     * <pre>
    +     * CaseUtils.toCamelCase(null, false)                                 = null
    +     * CaseUtils.toCamelCase("", false, *)                                = ""
    +     * CaseUtils.toCamelCase(*, false, null)                              = *
    +     * CaseUtils.toCamelCase(*, true, new char[0])                        = *
    +     * CaseUtils.toCamelCase("To.Camel.Case", false, new char[]{'.'})     = "toCamelCase"
    +     * CaseUtils.toCamelCase(" to @ Camel case", true, new char[]{'@'})   = "toCamelCase"
    +     * CaseUtils.toCamelCase(" @to @ Camel case", false, new char[]{'@'}) = "toCamelCase"
    +     * </pre>
    +     *
    +     * @param str  the String to be converted to camelCase, may be null
    +     * @param capitalizeFirstLetter boolean that determines if the first character of first word should be title case.
    +     * @param delimiters  set of characters to determine capitalization, null and/or empty array means whitespace
    +     * @return camelCase of String, <code>null</code> if null String input
    +     */
    +    public static String toCamelCase(String str, boolean capitalizeFirstLetter, final char... delimiters) {
    +        if (StringUtils.isEmpty(str)) {
    +            return str;
    +        }
    +        str = str.toLowerCase();
    +        int strLen = str.length();
    +        int [] newCodePoints = new int[strLen];
    +        int outOffset = 0;
    +        Set<Integer> delimiterSet = generateDelimiterSet(delimiters);
    +        boolean capitalizeNext = false;
    +        if (capitalizeFirstLetter) {
    +            capitalizeNext = true;
    +        }
    +        for (int index = 0; index < strLen;) {
    +            final int codePoint = str.codePointAt(index);
    +
    +            if (delimiterSet.contains(codePoint)) {
    +                capitalizeNext = true;
    +                if (outOffset == 0) {
    +                    capitalizeNext = false;
    +                }
    +                index += Character.charCount(codePoint);
    +            } else if (capitalizeNext || (outOffset == 0 && capitalizeFirstLetter)) {
    +                int titleCaseCodePoint = Character.toTitleCase(codePoint);
    --- End diff --
    
    +1 on operating on `int`s.


> Create CaseUtils class. Add toCamelCase
> ---------------------------------------
>
>                 Key: TEXT-85
>                 URL: https://issues.apache.org/jira/browse/TEXT-85
>             Project: Commons Text
>          Issue Type: Improvement
>            Reporter: Rob Tompkins
>            Assignee: Rob Tompkins
>
> Based on the conversation here:
> http://markmail.org/message/7nvizsbykvxpr7g5
> We wish to have a {{toCamelCase}} method. The suggestion is to create a {{CaseUtils}} class.
> I wonder if we should think about deprecating the case management in {{WordUtils}} and move it over? Maybe, maybe not.
> I would think our method signature would look something like:
> {code}
> String toCamelCase(String str, char delimiter, boolean capitalizeFirstLetter)
> {code}
> potentially with {{String}} replaced with {{CharSequence}}.
> Lastly, {{WordUtils.capitalizeFully(String str, final char... delimiters)}} might be a good starting point. https://github.com/apache/commons-text/blob/master/src/main/java/org/apache/commons/text/WordUtils.java#L467-L499


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