org.apache.fop.util.HexEncoder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id: HexEncoder.java 1827168 2018-03-19 08:49:57Z ssteiner $ */
package org.apache.fop.util;
/**
* A helper class to create hex-encoded representations of numbers.
*/
public final class HexEncoder {
private HexEncoder() { }
/**
* Returns an hex encoding of the given number as a string of the given length,
* left-padded with zeros if necessary.
*
* @param n a number
* @param width required length of the string
* @return an hex-encoded representation of the number
*/
public static String encode(int n, int width) {
char[] digits = new char[width];
for (int i = width - 1; i >= 0; i--) {
int digit = n & 0xF;
digits[i] = (char) (digit < 10 ? '0' + digit : 'A' + digit - 10);
n >>= 4;
}
return new String(digits);
}
/**
* Returns an hex encoding of the given character as:
*
* - 4-character string in case of non-BMP character
* - 6-character string in case of BMP character
*
*
* @param c a character
* @return an hex-encoded representation of the character
*/
public static String encode(int c) {
if (CharUtilities.isBmpCodePoint(c)) {
return encode(c, 4);
} else {
return encode(c, 6);
}
}
}