    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.lang3.text;
    018
    019import java.util.regex.Matcher;
    020import java.util.regex.Pattern;
    021
    022import org.apache.commons.lang3.ArrayUtils;
    023import org.apache.commons.lang3.StringUtils;
    024
    025/**
    026 * <p>Operations on Strings that contain words.</p>
    027 *
    028 * <p>This class tries to handle {@code null} input gracefully.
    029 * An exception will not be thrown for a {@code null} input.
    030 * Each method documents its behavior in more detail.</p>
    031 *
    032 * @since 2.0
    033 * @deprecated as of 3.6, use commons-text
    034 * <a href="https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/WordUtils.html">
    035 * WordUtils</a> instead
    036 */
    037@Deprecated
    038public class WordUtils {
    039
    040    /**
    041     * <p>{@code WordUtils} instances should NOT be constructed in
    042     * standard programming. Instead, the class should be used as
    043     * {@code WordUtils.wrap("foo bar", 20);}.</p>
    044     *
    045     * <p>This constructor is public to permit tools that require a JavaBean
    046     * instance to operate.</p>
    047     */
    048    public WordUtils() {
    049      super();
    050    }
    051
    052    // Wrapping
    053    //--------------------------------------------------------------------------
    054    /**
    055     * <p>Wraps a single line of text, identifying words by {@code ' '}.</p>
    056     *
    057     * <p>New lines will be separated by the system property line separator.
    058     * Very long words, such as URLs will <i>not</i> be wrapped.</p>
    059     *
    060     * <p>Leading spaces on a new line are stripped.
    061     * Trailing spaces are not stripped.</p>
    062     *
    063     * <table border="1">
    064     *  <caption>Examples</caption>
    065     *  <tr>
    066     *   <th>input</th>
    067     *   <th>wrapLength</th>
    068     *   <th>result</th>
    069     *  </tr>
    070     *  <tr>
    071     *   <td>null</td>
    072     *   <td>*</td>
    073     *   <td>null</td>
    074     *  </tr>
    075     *  <tr>
    076     *   <td>""</td>
    077     *   <td>*</td>
    078     *   <td>""</td>
    079     *  </tr>
    080     *  <tr>
    081     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    082     *   <td>20</td>
    083     *   <td>"Here is one line of\ntext that is going\nto be wrapped after\n20 columns."</td>
    084     *  </tr>
    085     *  <tr>
    086     *   <td>"Click here to jump to the commons website - https://commons.apache.org"</td>
    087     *   <td>20</td>
    088     *   <td>"Click here to jump\nto the commons\nwebsite -\nhttps://commons.apache.org"</td>
    089     *  </tr>
    090     *  <tr>
    091     *   <td>"Click here, https://commons.apache.org, to jump to the commons website"</td>
    092     *   <td>20</td>
    093     *   <td>"Click here,\nhttps://commons.apache.org,\nto jump to the\ncommons website"</td>
    094     *  </tr>
    095     * </table>
    096     *
    097     * (assuming that '\n' is the systems line separator)
    098     *
    099     * @param str  the String to be word wrapped, may be null
    100     * @param wrapLength  the column to wrap the words at, less than 1 is treated as 1
    101     * @return a line with newlines inserted, {@code null} if null input
    102     */
    103    public static String wrap(final String str, final int wrapLength) {
    104        return wrap(str, wrapLength, null, false);
    105    }
    106
    107    /**
    108     * <p>Wraps a single line of text, identifying words by {@code ' '}.</p>
    109     *
    110     * <p>Leading spaces on a new line are stripped.
    111     * Trailing spaces are not stripped.</p>
    112     *
    113     * <table border="1">
    114     *  <caption>Examples</caption>
    115     *  <tr>
    116     *   <th>input</th>
    117     *   <th>wrapLength</th>
    118     *   <th>newLineString</th>
    119     *   <th>wrapLongWords</th>
    120     *   <th>result</th>
    121     *  </tr>
    122     *  <tr>
    123     *   <td>null</td>
    124     *   <td>*</td>
    125     *   <td>*</td>
    126     *   <td>true/false</td>
    127     *   <td>null</td>
    128     *  </tr>
    129     *  <tr>
    130     *   <td>""</td>
    131     *   <td>*</td>
    132     *   <td>*</td>
    133     *   <td>true/false</td>
    134     *   <td>""</td>
    135     *  </tr>
    136     *  <tr>
    137     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    138     *   <td>20</td>
    139     *   <td>"\n"</td>
    140     *   <td>true/false</td>
    141     *   <td>"Here is one line of\ntext that is going\nto be wrapped after\n20 columns."</td>
    142     *  </tr>
    143     *  <tr>
    144     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    145     *   <td>20</td>
    146     *   <td>"&lt;br /&gt;"</td>
    147     *   <td>true/false</td>
    148     *   <td>"Here is one line of&lt;br /&gt;text that is going&lt;br /&gt;to be wrapped after&lt;br /&gt;20 columns."</td>
    149     *  </tr>
    150     *  <tr>
    151     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    152     *   <td>20</td>
    153     *   <td>null</td>
    154     *   <td>true/false</td>
    155     *   <td>"Here is one line of" + systemNewLine + "text that is going" + systemNewLine + "to be wrapped after" + systemNewLine + "20 columns."</td>
    156     *  </tr>
    157     *  <tr>
    158     *   <td>"Click here to jump to the commons website - https://commons.apache.org"</td>
    159     *   <td>20</td>
    160     *   <td>"\n"</td>
    161     *   <td>false</td>
    162     *   <td>"Click here to jump\nto the commons\nwebsite -\nhttps://commons.apache.org"</td>
    163     *  </tr>
    164     *  <tr>
    165     *   <td>"Click here to jump to the commons website - https://commons.apache.org"</td>
    166     *   <td>20</td>
    167     *   <td>"\n"</td>
    168     *   <td>true</td>
    169     *   <td>"Click here to jump\nto the commons\nwebsite -\nhttp://commons.apach\ne.org"</td>
    170     *  </tr>
    171     * </table>
    172     *
    173     * @param str  the String to be word wrapped, may be null
    174     * @param wrapLength  the column to wrap the words at, less than 1 is treated as 1
    175     * @param newLineStr  the string to insert for a new line,
    176     *  {@code null} uses the system property line separator
    177     * @param wrapLongWords  true if long words (such as URLs) should be wrapped
    178     * @return a line with newlines inserted, {@code null} if null input
    179     */
    180    public static String wrap(final String str, final int wrapLength, final String newLineStr, final boolean wrapLongWords) {
    181        return wrap(str, wrapLength, newLineStr, wrapLongWords, " ");
    182    }
    183
    184    /**
    185     * <p>Wraps a single line of text, identifying words by {@code wrapOn}.</p>
    186     *
    187     * <p>Leading spaces on a new line are stripped.
    188     * Trailing spaces are not stripped.</p>
    189     *
    190     * <table border="1">
    191     *  <caption>Examples</caption>
    192     *  <tr>
    193     *   <th>input</th>
    194     *   <th>wrapLength</th>
    195     *   <th>newLineString</th>
    196     *   <th>wrapLongWords</th>
    197     *   <th>wrapOn</th>
    198     *   <th>result</th>
    199     *  </tr>
    200     *  <tr>
    201     *   <td>null</td>
    202     *   <td>*</td>
    203     *   <td>*</td>
    204     *   <td>true/false</td>
    205     *   <td>*</td>
    206     *   <td>null</td>
    207     *  </tr>
    208     *  <tr>
    209     *   <td>""</td>
    210     *   <td>*</td>
    211     *   <td>*</td>
    212     *   <td>true/false</td>
    213     *   <td>*</td>
    214     *   <td>""</td>
    215     *  </tr>
    216     *  <tr>
    217     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    218     *   <td>20</td>
    219     *   <td>"\n"</td>
    220     *   <td>true/false</td>
    221     *   <td>" "</td>
    222     *   <td>"Here is one line of\ntext that is going\nto be wrapped after\n20 columns."</td>
    223     *  </tr>
    224     *  <tr>
    225     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    226     *   <td>20</td>
    227     *   <td>"&lt;br /&gt;"</td>
    228     *   <td>true/false</td>
    229     *   <td>" "</td>
    230     *   <td>"Here is one line of&lt;br /&gt;text that is going&lt;br /&gt;to be wrapped after&lt;br /&gt;20 columns."</td>
    231     *  </tr>
    232     *  <tr>
    233     *   <td>"Here is one line of text that is going to be wrapped after 20 columns."</td>
    234     *   <td>20</td>
    235     *   <td>null</td>
    236     *   <td>true/false</td>
    237     *   <td>" "</td>
    238     *   <td>"Here is one line of" + systemNewLine + "text that is going" + systemNewLine + "to be wrapped after" + systemNewLine + "20 columns."</td>
    239     *  </tr>
    240     *  <tr>
    241     *   <td>"Click here to jump to the commons website - https://commons.apache.org"</td>
    242     *   <td>20</td>
    243     *   <td>"\n"</td>
    244     *   <td>false</td>
    245     *   <td>" "</td>
    246     *   <td>"Click here to jump\nto the commons\nwebsite -\nhttps://commons.apache.org"</td>
    247     *  </tr>
    248     *  <tr>
    249     *   <td>"Click here to jump to the commons website - https://commons.apache.org"</td>
    250     *   <td>20</td>
    251     *   <td>"\n"</td>
    252     *   <td>true</td>
    253     *   <td>" "</td>
    254     *   <td>"Click here to jump\nto the commons\nwebsite -\nhttp://commons.apach\ne.org"</td>
    255     *  </tr>
    256     *  <tr>
    257     *   <td>"flammable/inflammable"</td>
    258     *   <td>20</td>
    259     *   <td>"\n"</td>
    260     *   <td>true</td>
    261     *   <td>"/"</td>
    262     *   <td>"flammable\ninflammable"</td>
    263     *  </tr>
    264     * </table>
    265     * @param str  the String to be word wrapped, may be null
    266     * @param wrapLength  the column to wrap the words at, less than 1 is treated as 1
    267     * @param newLineStr  the string to insert for a new line,
    268     *  {@code null} uses the system property line separator
    269     * @param wrapLongWords  true if long words (such as URLs) should be wrapped
    270     * @param wrapOn regex expression to be used as a breakable characters,
    271     *               if blank string is provided a space character will be used
    272     * @return a line with newlines inserted, {@code null} if null input
    273     */
    274    public static String wrap(final String str, int wrapLength, String newLineStr, final boolean wrapLongWords, String wrapOn) {
    275        if (str == null) {
    276            return null;
    277        }
    278        if (newLineStr == null) {
    279            newLineStr = System.lineSeparator();
    280        }
    281        if (wrapLength < 1) {
    282            wrapLength = 1;
    283        }
    284        if (StringUtils.isBlank(wrapOn)) {
    285            wrapOn = " ";
    286        }
    287        final Pattern patternToWrapOn = Pattern.compile(wrapOn);
    288        final int inputLineLength = str.length();
    289        int offset = 0;
    290        final StringBuilder wrappedLine = new StringBuilder(inputLineLength + 32);
    291
    292        while (offset < inputLineLength) {
    293            int spaceToWrapAt = -1;
    294            Matcher matcher = patternToWrapOn.matcher(
    295                str.substring(offset, Math.min((int) Math.min(Integer.MAX_VALUE, offset + wrapLength + 1L), inputLineLength)));
    296            if (matcher.find()) {
    297                if (matcher.start() == 0) {
    298                    offset += matcher.end();
    299                    continue;
    300                }
    301                spaceToWrapAt = matcher.start() + offset;
    302            }
    303
    304            // only last line without leading spaces is left
    305            if (inputLineLength - offset <= wrapLength) {
    306                break;
    307            }
    308
    309            while (matcher.find()) {
    310                spaceToWrapAt = matcher.start() + offset;
    311            }
    312
    313            if (spaceToWrapAt >= offset) {
    314                // normal case
    315                wrappedLine.append(str, offset, spaceToWrapAt);
    316                wrappedLine.append(newLineStr);
    317                offset = spaceToWrapAt + 1;
    318
    319            } else {
    320                // really long word or URL
    321                if (wrapLongWords) {
    322                    // wrap really long word one line at a time
    323                    wrappedLine.append(str, offset, wrapLength + offset);
    324                    wrappedLine.append(newLineStr);
    325                    offset += wrapLength;
    326                } else {
    327                    // do not wrap really long word, just extend beyond limit
    328                    matcher = patternToWrapOn.matcher(str.substring(offset + wrapLength));
    329                    if (matcher.find()) {
    330                        spaceToWrapAt = matcher.start() + offset + wrapLength;
    331                    }
    332
    333                    if (spaceToWrapAt >= 0) {
    334                        wrappedLine.append(str, offset, spaceToWrapAt);
    335                        wrappedLine.append(newLineStr);
    336                        offset = spaceToWrapAt + 1;
    337                    } else {
    338                        wrappedLine.append(str, offset, str.length());
    339                        offset = inputLineLength;
    340                    }
    341                }
    342            }
    343        }
    344
    345        // Whatever is left in line is short enough to just pass through
    346        wrappedLine.append(str, offset, str.length());
    347
    348        return wrappedLine.toString();
    349    }
    350
    351    // Capitalizing
    352    //-----------------------------------------------------------------------
    353    /**
    354     * <p>Capitalizes all the whitespace separated words in a String.
    355     * Only the first character of each word is changed. To convert the
    356     * rest of each word to lowercase at the same time,
    357     * use {@link #capitalizeFully(String)}.</p>
    358     *
    359     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
    360     * A {@code null} input String returns {@code null}.
    361     * Capitalization uses the Unicode title case, normally equivalent to
    362     * upper case.</p>
    363     *
    364     * <pre>
    365     * WordUtils.capitalize(null)        = null
    366     * WordUtils.capitalize("")          = ""
    367     * WordUtils.capitalize("i am FINE") = "I Am FINE"
    368     * </pre>
    369     *
    370     * @param str  the String to capitalize, may be null
    371     * @return capitalized String, {@code null} if null String input
    372     * @see #uncapitalize(String)
    373     * @see #capitalizeFully(String)
    374     */
    375    public static String capitalize(final String str) {
    376        return capitalize(str, null);
    377    }
    378
    379    /**
    380     * <p>Capitalizes all the delimiter separated words in a String.
    381     * Only the first character of each word is changed. To convert the
    382     * rest of each word to lowercase at the same time,
    383     * use {@link #capitalizeFully(String, char[])}.</p>
    384     *
    385     * <p>The delimiters represent a set of characters understood to separate words.
    386     * The first string character and the first non-delimiter character after a
    387     * delimiter will be capitalized. </p>
    388     *
    389     * <p>A {@code null} input String returns {@code null}.
    390     * Capitalization uses the Unicode title case, normally equivalent to
    391     * upper case.</p>
    392     *
    393     * <pre>
    394     * WordUtils.capitalize(null, *)            = null
    395     * WordUtils.capitalize("", *)              = ""
    396     * WordUtils.capitalize(*, new char[0])     = *
    397     * WordUtils.capitalize("i am fine", null)  = "I Am Fine"
    398     * WordUtils.capitalize("i aM.fine", {'.'}) = "I aM.Fine"
    399     * </pre>
    400     *
    401     * @param str  the String to capitalize, may be null
    402     * @param delimiters  set of characters to determine capitalization, null means whitespace
    403     * @return capitalized String, {@code null} if null String input
    404     * @see #uncapitalize(String)
    405     * @see #capitalizeFully(String)
    406     * @since 2.1
    407     */
    408    public static String capitalize(final String str, final char... delimiters) {
    409        final int delimLen = delimiters == null ? -1 : delimiters.length;
    410        if (StringUtils.isEmpty(str) || delimLen == 0) {
    411            return str;
    412        }
    413        final char[] buffer = str.toCharArray();
    414        boolean capitalizeNext = true;
    415        for (int i = 0; i < buffer.length; i++) {
    416            final char ch = buffer[i];
    417            if (isDelimiter(ch, delimiters)) {
    418                capitalizeNext = true;
    419            } else if (capitalizeNext) {
    420                buffer[i] = Character.toTitleCase(ch);
    421                capitalizeNext = false;
    422            }
    423        }
    424        return new String(buffer);
    425    }
    426
    427    //-----------------------------------------------------------------------
    428    /**
    429     * <p>Converts all the whitespace separated words in a String into capitalized words,
    430     * that is each word is made up of a titlecase character and then a series of
    431     * lowercase characters.  </p>
    432     *
    433     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
    434     * A {@code null} input String returns {@code null}.
    435     * Capitalization uses the Unicode title case, normally equivalent to
    436     * upper case.</p>
    437     *
    438     * <pre>
    439     * WordUtils.capitalizeFully(null)        = null
    440     * WordUtils.capitalizeFully("")          = ""
    441     * WordUtils.capitalizeFully("i am FINE") = "I Am Fine"
    442     * </pre>
    443     *
    444     * @param str  the String to capitalize, may be null
    445     * @return capitalized String, {@code null} if null String input
    446     */
    447    public static String capitalizeFully(final String str) {
    448        return capitalizeFully(str, null);
    449    }
    450
    451    /**
    452     * <p>Converts all the delimiter separated words in a String into capitalized words,
    453     * that is each word is made up of a titlecase character and then a series of
    454     * lowercase characters. </p>
    455     *
    456     * <p>The delimiters represent a set of characters understood to separate words.
    457     * The first string character and the first non-delimiter character after a
    458     * delimiter will be capitalized. </p>
    459     *
    460     * <p>A {@code null} input String returns {@code null}.
    461     * Capitalization uses the Unicode title case, normally equivalent to
    462     * upper case.</p>
    463     *
    464     * <pre>
    465     * WordUtils.capitalizeFully(null, *)            = null
    466     * WordUtils.capitalizeFully("", *)              = ""
    467     * WordUtils.capitalizeFully(*, null)            = *
    468     * WordUtils.capitalizeFully(*, new char[0])     = *
    469     * WordUtils.capitalizeFully("i aM.fine", {'.'}) = "I am.Fine"
    470     * </pre>
    471     *
    472     * @param str  the String to capitalize, may be null
    473     * @param delimiters  set of characters to determine capitalization, null means whitespace
    474     * @return capitalized String, {@code null} if null String input
    475     * @since 2.1
    476     */
    477    public static String capitalizeFully(String str, final char... delimiters) {
    478        final int delimLen = delimiters == null ? -1 : delimiters.length;
    479        if (StringUtils.isEmpty(str) || delimLen == 0) {
    480            return str;
    481        }
    482        str = str.toLowerCase();
    483        return capitalize(str, delimiters);
    484    }
    485
    486    //-----------------------------------------------------------------------
    487    /**
    488     * <p>Uncapitalizes all the whitespace separated words in a String.
    489     * Only the first character of each word is changed.</p>
    490     *
    491     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
    492     * A {@code null} input String returns {@code null}.</p>
    493     *
    494     * <pre>
    495     * WordUtils.uncapitalize(null)        = null
    496     * WordUtils.uncapitalize("")          = ""
    497     * WordUtils.uncapitalize("I Am FINE") = "i am fINE"
    498     * </pre>
    499     *
    500     * @param str  the String to uncapitalize, may be null
    501     * @return uncapitalized String, {@code null} if null String input
    502     * @see #capitalize(String)
    503     */
    504    public static String uncapitalize(final String str) {
    505        return uncapitalize(str, null);
    506    }
    507
    508    /**
    509     * <p>Uncapitalizes all the whitespace separated words in a String.
    510     * Only the first character of each word is changed.</p>
    511     *
    512     * <p>The delimiters represent a set of characters understood to separate words.
    513     * The first string character and the first non-delimiter character after a
    514     * delimiter will be uncapitalized. </p>
    515     *
    516     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
    517     * A {@code null} input String returns {@code null}.</p>
    518     *
    519     * <pre>
    520     * WordUtils.uncapitalize(null, *)            = null
    521     * WordUtils.uncapitalize("", *)              = ""
    522     * WordUtils.uncapitalize(*, null)            = *
    523     * WordUtils.uncapitalize(*, new char[0])     = *
    524     * WordUtils.uncapitalize("I AM.FINE", {'.'}) = "i AM.fINE"
    525     * </pre>
    526     *
    527     * @param str  the String to uncapitalize, may be null
    528     * @param delimiters  set of characters to determine uncapitalization, null means whitespace
    529     * @return uncapitalized String, {@code null} if null String input
    530     * @see #capitalize(String)
    531     * @since 2.1
    532     */
    533    public static String uncapitalize(final String str, final char... delimiters) {
    534        final int delimLen = delimiters == null ? -1 : delimiters.length;
    535        if (StringUtils.isEmpty(str) || delimLen == 0) {
    536            return str;
    537        }
    538        final char[] buffer = str.toCharArray();
    539        boolean uncapitalizeNext = true;
    540        for (int i = 0; i < buffer.length; i++) {
    541            final char ch = buffer[i];
    542            if (isDelimiter(ch, delimiters)) {
    543                uncapitalizeNext = true;
    544            } else if (uncapitalizeNext) {
    545                buffer[i] = Character.toLowerCase(ch);
    546                uncapitalizeNext = false;
    547            }
    548        }
    549        return new String(buffer);
    550    }
    551
    552    //-----------------------------------------------------------------------
    553    /**
    554     * <p>Swaps the case of a String using a word based algorithm.</p>
    555     *
    556     * <ul>
    557     *  <li>Upper case character converts to Lower case</li>
    558     *  <li>Title case character converts to Lower case</li>
    559     *  <li>Lower case character after Whitespace or at start converts to Title case</li>
    560     *  <li>Other Lower case character converts to Upper case</li>
    561     * </ul>
    562     *
    563     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
    564     * A {@code null} input String returns {@code null}.</p>
    565     *
    566     * <pre>
    567     * StringUtils.swapCase(null)                 = null
    568     * StringUtils.swapCase("")                   = ""
    569     * StringUtils.swapCase("The dog has a BONE") = "tHE DOG HAS A bone"
    570     * </pre>
    571     *
    572     * @param str  the String to swap case, may be null
    573     * @return the changed String, {@code null} if null String input
    574     */
    575    public static String swapCase(final String str) {
    576        if (StringUtils.isEmpty(str)) {
    577            return str;
    578        }
    579        final char[] buffer = str.toCharArray();
    580
    581        boolean whitespace = true;
    582
    583        for (int i = 0; i < buffer.length; i++) {
    584            final char ch = buffer[i];
    585            if (Character.isUpperCase(ch) || Character.isTitleCase(ch)) {
    586                buffer[i] = Character.toLowerCase(ch);
    587                whitespace = false;
    588            } else if (Character.isLowerCase(ch)) {
    589                if (whitespace) {
    590                    buffer[i] = Character.toTitleCase(ch);
    591                    whitespace = false;
    592                } else {
    593                    buffer[i] = Character.toUpperCase(ch);
    594                }
    595            } else {
    596                whitespace = Character.isWhitespace(ch);
    597            }
    598        }
    599        return new String(buffer);
    600    }
    601
    602    //-----------------------------------------------------------------------
    603    /**
    604     * <p>Extracts the initial characters from each word in the String.</p>
    605     *
    606     * <p>All first characters after whitespace are returned as a new string.
    607     * Their case is not changed.</p>
    608     *
    609     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
    610     * A {@code null} input String returns {@code null}.</p>
    611     *
    612     * <pre>
    613     * WordUtils.initials(null)             = null
    614     * WordUtils.initials("")               = ""
    615     * WordUtils.initials("Ben John Lee")   = "BJL"
    616     * WordUtils.initials("Ben J.Lee")      = "BJ"
    617     * </pre>
    618     *
    619     * @param str  the String to get initials from, may be null
    620     * @return String of initial letters, {@code null} if null String input
    621     * @see #initials(String,char[])
    622     * @since 2.2
    623     */
    624    public static String initials(final String str) {
    625        return initials(str, null);
    626    }
    627
    628    /**
    629     * <p>Extracts the initial characters from each word in the String.</p>
    630     *
    631     * <p>All first characters after the defined delimiters are returned as a new string.
    632     * Their case is not changed.</p>
    633     *
    634     * <p>If the delimiters array is null, then Whitespace is used.
    635     * Whitespace is defined by {@link Character#isWhitespace(char)}.
    636     * A {@code null} input String returns {@code null}.
    637     * An empty delimiter array returns an empty String.</p>
    638     *
    639     * <pre>
    640     * WordUtils.initials(null, *)                = null
    641     * WordUtils.initials("", *)                  = ""
    642     * WordUtils.initials("Ben John Lee", null)   = "BJL"
    643     * WordUtils.initials("Ben J.Lee", null)      = "BJ"
    644     * WordUtils.initials("Ben J.Lee", [' ','.']) = "BJL"
    645     * WordUtils.initials(*, new char[0])         = ""
    646     * </pre>
    647     *
    648     * @param str  the String to get initials from, may be null
    649     * @param delimiters  set of characters to determine words, null means whitespace
    650     * @return String of initial characters, {@code null} if null String input
    651     * @see #initials(String)
    652     * @since 2.2
    653     */
    654    public static String initials(final String str, final char... delimiters) {
    655        if (StringUtils.isEmpty(str)) {
    656            return str;
    657        }
    658        if (delimiters != null && delimiters.length == 0) {
    659            return StringUtils.EMPTY;
    660        }
    661        final int strLen = str.length();
    662        final char[] buf = new char[strLen / 2 + 1];
    663        int count = 0;
    664        boolean lastWasGap = true;
    665        for (int i = 0; i < strLen; i++) {
    666            final char ch = str.charAt(i);
    667
    668            if (isDelimiter(ch, delimiters)) {
    669                lastWasGap = true;
    670            } else if (lastWasGap) {
    671                buf[count++] = ch;
    672                lastWasGap = false;
    673            } else {
    674                continue; // ignore ch
    675            }
    676        }
    677        return new String(buf, 0, count);
    678    }
    679
    680    //-----------------------------------------------------------------------
    681    /**
    682     * <p>Checks if the String contains all words in the given array.</p>
    683     *
    684     * <p>
    685     * A {@code null} String will return {@code false}. A {@code null}, zero
    686     * length search array or if one element of array is null will return {@code false}.
    687     * </p>
    688     *
    689     * <pre>
    690     * WordUtils.containsAllWords(null, *)            = false
    691     * WordUtils.containsAllWords("", *)              = false
    692     * WordUtils.containsAllWords(*, null)            = false
    693     * WordUtils.containsAllWords(*, [])              = false
    694     * WordUtils.containsAllWords("abcd", "ab", "cd") = false
    695     * WordUtils.containsAllWords("abc def", "def", "abc") = true
    696     * </pre>
    697     *
    698     *
    699     * @param word The CharSequence to check, may be null
    700     * @param words The array of String words to search for, may be null
    701     * @return {@code true} if all search words are found, {@code false} otherwise
    702     * @since 3.5
    703     */
    704    public static boolean containsAllWords(final CharSequence word, final CharSequence... words) {
    705        if (StringUtils.isEmpty(word) || ArrayUtils.isEmpty(words)) {
    706            return false;
    707        }
    708        for (final CharSequence w : words) {
    709            if (StringUtils.isBlank(w)) {
    710                return false;
    711            }
    712            final Pattern p = Pattern.compile(".*\\b" + w + "\\b.*");
    713            if (!p.matcher(word).matches()) {
    714                return false;
    715            }
    716        }
    717        return true;
    718    }
    719
    720    //-----------------------------------------------------------------------
    721    /**
    722     * Is the character a delimiter.
    723     *
    724     * @param ch  the character to check
    725     * @param delimiters  the delimiters
    726     * @return true if it is a delimiter
    727     */
    728    private static boolean isDelimiter(final char ch, final char[] delimiters) {
    729        if (delimiters == null) {
    730            return Character.isWhitespace(ch);
    731        }
    732        for (final char delimiter : delimiters) {
    733            if (ch == delimiter) {
    734                return true;
    735            }
    736        }
    737        return false;
    738    }
    739
    740}