hydrograph.ui.common.util.ConvertHexValues.java Source code

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Here is the source code for hydrograph.ui.common.util.ConvertHexValues.java

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/*******************************************************************************
 * Copyright 2017 Capital One Services, LLC and Bitwise, Inc.
 * Licensed 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.
 *******************************************************************************/

package hydrograph.ui.common.util;

import org.apache.commons.lang.StringUtils;

/**
 * This class is used to convert hex-value into its equivalent character.
 * 
 * @author Bitwise
 * 
 */
public class ConvertHexValues {

    /**
     * This method converts input hex-value into its equivalent character.
     * 
     * @param input
     *            , hex-value e.g. \x21 for !
     * @return string, if given input is valid hex-value then its equivalent character is returned else input is
     *         returned as it is.
     */
    public static String parseHex(String input) {
        final int NO_OF_DIGITS = 2;

        if (StringUtils.isBlank(input) || StringUtils.length(input) < NO_OF_DIGITS + 2)
            return input;

        // Added support for \\t
        if (input.contains("\\t")) {
            input = input.replace("\\t", "\\x09");
        }

        String[] tokens = input.split("\\\\x");
        String hex;
        String temp;
        boolean startsWithHex = input.startsWith("\\x");

        for (int counter = 0; counter < tokens.length; counter++) {

            if (counter == 0 && !startsWithHex)
                continue;

            if (tokens[counter].equals(""))
                continue;

            temp = tokens[counter];
            hex = temp.substring(0, NO_OF_DIGITS);
            temp = temp.substring(NO_OF_DIGITS, temp.length());
            try {
                tokens[counter] = hexToChar(hex) + temp;
            } catch (NumberFormatException numberFormatException) {
                tokens[counter] = hex + temp;
            }
        }

        String result = "";
        for (String token : tokens) {
            result = result + token;
        }

        return result;

    }

    // Parses the string argument as a signed short in the radix specified by the second argument.
    private static char hexToChar(String hex) throws NumberFormatException {
        return (char) Short.parseShort(hex, 16);
    }
}