org.apache.fop.util.HexEncoder Maven / Gradle / Ivy

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Tool to convert CSV and XLS to XML, to transform XML and to convert XML to CSV, HTML, other text files, PDF etc., useful as command line tool and integrated in other projects.

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/*
 * 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 1352986 2012-06-22 18:07:04Z vhennebert $ */

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 a four-character string.
     *
     * @param c a character
     * @return an hex-encoded representation of the character
     */
    public static String encode(char c) {
        return encode(c, 4);
    }

}