Example usage for java.lang Character isLowerCase

Introduction

In this page you can find the example usage for java.lang Character isLowerCase.

Prototype

public static boolean isLowerCase(int codePoint)

Source Link

Document

Determines if the specified character (Unicode code point) is a lowercase character.

Usage

From source file:bfile.util.StringUtils.java

/**
 * <p>Swaps the case of a String changing upper and title case to
 * lower case, and lower case to upper case.</p>
 *
 * <ul>//w w  w. j  a va 2s.  com
 *  <li>Upper case character converts to Lower case</li>
 *  <li>Title case character converts to Lower case</li>
 *  <li>Lower case character converts to Upper case</li>
 * </ul>
 *
 * <p>For a word based algorithm, see {@link org.apache.commons.lang3.text.WordUtils#swapCase(String)}.
 * A {@code null} input String returns {@code null}.</p>
 *
 * <pre>
 * StringUtils.swapCase(null)                 = null
 * StringUtils.swapCase("")                   = ""
 * StringUtils.swapCase("The dog has a BONE") = "tHE DOG HAS A bone"
 * </pre>
 *
 * <p>NOTE: This method changed in Lang version 2.0.
 * It no longer performs a word based algorithm.
 * If you only use ASCII, you will notice no change.
 * That functionality is available in org.apache.commons.lang3.text.WordUtils.</p>
 *
 * @param str  the String to swap case, may be null
 * @return the changed String, {@code null} if null String input
 */
public static String swapCase(final String str) {
    if (StringUtils.isEmpty(str)) {
        return str;
    }

    final int strLen = str.length();
    int newCodePoints[] = new int[strLen]; // cannot be longer than the char array
    int outOffset = 0;
    for (int i = 0; i < strLen;) {
        final int oldCodepoint = str.codePointAt(i);
        final int newCodePoint;
        if (Character.isUpperCase(oldCodepoint)) {
            newCodePoint = Character.toLowerCase(oldCodepoint);
        } else if (Character.isTitleCase(oldCodepoint)) {
            newCodePoint = Character.toLowerCase(oldCodepoint);
        } else if (Character.isLowerCase(oldCodepoint)) {
            newCodePoint = Character.toUpperCase(oldCodepoint);
        } else {
            newCodePoint = oldCodepoint;
        }
        newCodePoints[outOffset++] = newCodePoint;
        i += Character.charCount(newCodePoint);
    }
    return new String(newCodePoints, 0, outOffset);
}

From source file:bfile.util.StringUtils.java

/**
 * <p>Checks if the CharSequence contains only lowercase characters.</p>
 *
 * <p>{@code null} will return {@code false}.
 * An empty CharSequence (length()=0) will return {@code false}.</p>
 *
 * <pre>//from w ww  .j av a 2  s. c  o m
 * StringUtils.isAllLowerCase(null)   = false
 * StringUtils.isAllLowerCase("")     = false
 * StringUtils.isAllLowerCase("  ")   = false
 * StringUtils.isAllLowerCase("abc")  = true
 * StringUtils.isAllLowerCase("abC")  = false
 * StringUtils.isAllLowerCase("ab c") = false
 * StringUtils.isAllLowerCase("ab1c") = false
 * StringUtils.isAllLowerCase("ab/c") = false
 * </pre>
 *
 * @param cs  the CharSequence to check, may be null
 * @return {@code true} if only contains lowercase characters, and is non-null
 * @since 2.5
 * @since 3.0 Changed signature from isAllLowerCase(String) to isAllLowerCase(CharSequence)
 */
public static boolean isAllLowerCase(final CharSequence cs) {
    if (cs == null || isEmpty(cs)) {
        return false;
    }
    final int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (Character.isLowerCase(cs.charAt(i)) == false) {
            return false;
        }
    }
    return true;
}