Java String Uncapitalize uncapitalize(String str)

Description

Uncapitalizes all the whitespace separated words in a String.

License

Apache License

Parameter

Parameter	Description
str	the String to uncapitalize, may be null

Return

uncapitalized String, null if null String input

Declaration

public static String uncapitalize(String str) 

Method Source Code

//package com.java2s;
/*//w ww. j a v a 2  s.  c o m
 * Copyright 2002-2004 The Apache Software Foundation.
 * 
 * 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.
 */

public class Main {
    /**
     * <p>Uncapitalizes all the whitespace separated words in a String.
     * Only the first letter of each word is changed.</p>
     *
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
     * A <code>null</code> input String returns <code>null</code>.</p>
     *
     * <pre>
     * WordUtils.uncapitalize(null)        = null
     * WordUtils.uncapitalize("")          = ""
     * WordUtils.uncapitalize("I Am FINE") = "i am fINE"
     * </pre>
     * 
     * @param str  the String to uncapitalize, may be null
     * @return uncapitalized String, <code>null</code> if null String input
     * @see #capitalize(String)
     */
    public static String uncapitalize(String str) {
        return uncapitalize(str, null);
    }

    /**
     * <p>Uncapitalizes all the whitespace separated words in a String.
     * Only the first letter of each word is changed.</p>
     *
     * <p>The delimiters represent a set of characters understood to separate words.
     * The first string character and the first non-delimiter character after a
     * delimiter will be uncapitalized. </p>
     *
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.
     * A <code>null</code> input String returns <code>null</code>.</p>
     *
     * <pre>
     * WordUtils.uncapitalize(null)        = null
     * WordUtils.uncapitalize("")          = ""
     * WordUtils.uncapitalize("I Am FINE") = "i am fINE"
     * </pre>
     * 
     * @param str  the String to uncapitalize, may be null
     * @param delimiters  set of characters to determine uncapitalization
     * @return uncapitalized String, <code>null</code> if null String input
     * @see #capitalize(String)
     */
    public static String uncapitalize(String str, char[] delimiters) {
        if (str == null || str.length() == 0) {
            return str;
        }
        int strLen = str.length();

        int delimitersLen = 0;
        if (delimiters != null) {
            delimitersLen = delimiters.length;
        }

        StringBuffer buffer = new StringBuffer(strLen);
        boolean uncapitalizeNext = true;
        for (int i = 0; i < strLen; i++) {
            char ch = str.charAt(i);

            boolean isDelimiter = false;
            if (delimiters == null) {
                isDelimiter = Character.isWhitespace(ch);
            } else {
                for (int j = 0; j < delimitersLen; j++) {
                    if (ch == delimiters[j]) {
                        isDelimiter = true;
                        break;
                    }
                }
            }

            if (isDelimiter) {
                buffer.append(ch);
                uncapitalizeNext = true;
            } else if (uncapitalizeNext) {
                buffer.append(Character.toLowerCase(ch));
                uncapitalizeNext = false;
            } else {
                buffer.append(ch);
            }
        }
        return buffer.toString();
    }
}

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