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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
import java.util.Locale;
/**
* The lower casing method to use in Vespa when doing string processing of data
* which is not to be handled as natural language data, e.g. field names or
* configuration paramaters.
*
* @author Steinar Knutsen
*/
public final class Lowercase {
private static final char[] lowercase = new char[123];
static {
lowercase[0x41] = 'a';
lowercase[0x42] = 'b';
lowercase[0x43] = 'c';
lowercase[0x44] = 'd';
lowercase[0x45] = 'e';
lowercase[0x46] = 'f';
lowercase[0x47] = 'g';
lowercase[0x48] = 'h';
lowercase[0x49] = 'i';
lowercase[0x4A] = 'j';
lowercase[0x4B] = 'k';
lowercase[0x4C] = 'l';
lowercase[0x4D] = 'm';
lowercase[0x4E] = 'n';
lowercase[0x4F] = 'o';
lowercase[0x50] = 'p';
lowercase[0x51] = 'q';
lowercase[0x52] = 'r';
lowercase[0x53] = 's';
lowercase[0x54] = 't';
lowercase[0x55] = 'u';
lowercase[0x56] = 'v';
lowercase[0x57] = 'w';
lowercase[0x58] = 'x';
lowercase[0x59] = 'y';
lowercase[0x5A] = 'z';
lowercase[0x61] = 'a';
lowercase[0x62] = 'b';
lowercase[0x63] = 'c';
lowercase[0x64] = 'd';
lowercase[0x65] = 'e';
lowercase[0x66] = 'f';
lowercase[0x67] = 'g';
lowercase[0x68] = 'h';
lowercase[0x69] = 'i';
lowercase[0x6A] = 'j';
lowercase[0x6B] = 'k';
lowercase[0x6C] = 'l';
lowercase[0x6D] = 'm';
lowercase[0x6E] = 'n';
lowercase[0x6F] = 'o';
lowercase[0x70] = 'p';
lowercase[0x71] = 'q';
lowercase[0x72] = 'r';
lowercase[0x73] = 's';
lowercase[0x74] = 't';
lowercase[0x75] = 'u';
lowercase[0x76] = 'v';
lowercase[0x77] = 'w';
lowercase[0x78] = 'x';
lowercase[0x79] = 'y';
lowercase[0x7A] = 'z';
}
/**
* Return a lowercased version of the given string. Since this is language
* independent, this is more of a case normalization operation than
* lowercasing. Vespa code should <i>never</i> do lowercasing with implicit
* locale.
*
* @param in
* a string to lowercase
* @return a string containing only lowercase character
*/
public static String toLowerCase(String in) {
// def is picked from http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#toLowerCase%28%29
String lower = toLowerCasePrintableAsciiOnly(in);
return (lower == null) ? in.toLowerCase(Locale.ENGLISH) : lower;
}
public static String toUpperCase(String in) {
// def is picked from http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#toLowerCase%28%29
return in.toUpperCase(Locale.ENGLISH);
}
private static String toLowerCasePrintableAsciiOnly(String in) {
boolean anyUpper = false;
for (int i = 0; i < in.length(); i++) {
char c = in.charAt(i);
if (c < 0x41) { //lower than A-Z
return null;
}
if (c > 0x5A && c < 0x61) { //between A-Z and a-z
return null;
}
if (c > 0x7A) { //higher than a-z
return null;
}
if (c != lowercase[c]) {
anyUpper = true;
}
}
if (!anyUpper) {
return in;
}
StringBuilder builder = new StringBuilder(in.length());
for (int i = 0; i < in.length(); i++) {
builder.append((char) (in.charAt(i) | ((char) 0x20)));
}
return builder.toString();
}
}
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