Example usage for java.lang String codePointAt

Introduction

In this page you can find the example usage for java.lang String codePointAt.

Prototype

public int codePointAt(int index)

Source Link

Document

Returns the character (Unicode code point) at the specified index.

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>//from w  w  w  .j a  va  2s. c  om
 *  <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:StreamFlusher.java

public Object visit(ASTnet_explode_func_call node, Object data) {
    // just #^__explode(regexp) built-in
    // take a two-state, one arc acceptor, get the label 
    //    on the one arc
    //    (an int, typically mapping to a multichar name), 
    //      get the print name,
    //    make a new one-path network for the exploded 
    //      string of characters in that name

    // there should be just one daughter, acceptor,
    // one string (non-empty), two states, one arc
    node.jjtGetChild(0).jjtAccept(this, data);
    Fst fst = (Fst) stack.pop();/*from   w  ww  .  j  a v  a 2s.c o m*/

    // get the single arc label
    int label = lib.GetSingleArcLabel(fst);

    // get the print name of the symbol 
    //   (typically a multichar symbol name)
    String str = symmap.getsym(label);

    // KRB
    // the str will be composed of BMP Unicode characters 
    //      (keep an eye on this--it
    //       depends on what is allowed in a multichar symbol)
    int len = str.length();
    // create an array of ints (code point values)
    int[] cpvArray = new int[len];
    for (int index = 0; index < len; index++) {
        int cpv = str.codePointAt(index);
        symmap.putsym(String.valueOf((char) cpv));
        cpvArray[index] = cpv;
    }
    Fst resultFst = lib.FstFromCpvArray(cpvArray);
    stack.push(resultFst);

    return data;
}

From source file:StreamFlusher.java

public Object visit(ASTnet_to_string_func_call node, Object data) {
    // convert a number (Long or Float) to a string
    // just $^__toString(numexp) built-in
    // should be just one daughter: arg_list with one numexp
    node.jjtGetChild(0).jjtAccept(this, data);
    // leaves a Long or Double object on the stack
    Object obj = stack.pop();//from   w  w w .ja  v a  2 s.c om

    String str;

    // produce either Long or Double, according to the input
    if (obj instanceof Long) {
        str = Long.toString(((Long) obj).longValue());
    } else {
        str = Double.toString(((Double) obj).doubleValue());
    }

    // Because all digits in a number string are in the BMP,
    // this str will be composed of BMP Unicode characters
    // convert to an array of int
    int len = str.length();
    int[] cpvArray = new int[len];

    for (int index = 0; index < len; index++) {
        int cpv = str.codePointAt(index);
        symmap.putsym(String.valueOf((char) cpv));
        cpvArray[index] = cpv;
    }
    Fst resultFst = lib.FstFromCpvArray(cpvArray);
    stack.push(resultFst);

    return data;
}