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'Databene Formats' is an open source software library for supporting data file and other formats like CSV, fixed width files, XLS, Properties and Regex. It is designed for multithreaded use and high performance.
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/*
 * Copyright (C) 2011-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 org.databene.formats.text;

import java.text.MessageFormat;

import org.databene.commons.ConversionException;
import org.databene.commons.Converter;
import org.databene.commons.StringUtil;
import org.databene.commons.converter.ThreadSafeConverter;

/**
 * {@link Converter} that transforms an object into its hexadecimal representation.
 * It works with integral numbers, characters and strings.
 * Created: 29.10.2009 08:44:53
 * @since 0.5.0
 * @author Volker Bergmann
 */
public class ToHexConverter extends ThreadSafeConverter {
	
	private boolean upperCase;
	private String pattern;
	private int length;

	public ToHexConverter() {
	    this(false);
    }

	public ToHexConverter(boolean upperCase) {
	    this(upperCase, null);
    }

	public ToHexConverter(boolean upperCase, String pattern) {
	    this(upperCase, pattern, -1);
    }

	public ToHexConverter(boolean upperCase, String pattern, int length) {
	    super(Object.class, String.class);
	    this.upperCase = upperCase;
	    this.pattern = pattern;
	    this.length = length;
    }

	@Override
	public String convert(Object sourceValue) throws ConversionException {
		if (sourceValue == null)
			return null;
		Class sourceType = sourceValue.getClass();
		if (sourceType == Long.class)
			return convertLong((Long) sourceValue, upperCase, pattern, length);
		else if (sourceType == Integer.class)
			return convertInt((Integer) sourceValue, upperCase, pattern, length);
		else if (sourceType == Short.class)
			return convertShort((Short) sourceValue, upperCase, pattern, length);
		else if (sourceType == Byte.class)
			return convertByte((Byte) sourceValue, upperCase, pattern, length);
		else if (sourceType == Character.class)
			return convertChar((Character) sourceValue, upperCase, pattern, length);
		else if (sourceType == String.class)
			return convertString((String) sourceValue, upperCase, pattern, length);
		else
			throw new IllegalArgumentException("Can't render '" + sourceType + "' in hex format.");
    }

	public static String convertLong(Long sourceValue, boolean upperCase, String pattern, int length) {
	    String base = Long.toHexString(sourceValue);
	    return postProcess(base, upperCase, pattern, length);
    }

	public static String convertInt(int sourceValue, boolean upperCase, String pattern, int length) {
	    String base = Integer.toHexString(sourceValue);
	    return postProcess(base, upperCase, pattern, length);
    }

	public static String convertShort(short sourceValue, boolean upperCase, String pattern, int length) {
	    String base = Integer.toHexString(sourceValue);
	    if (base.length() == 8)
	    	base = base.substring(4);
	    return postProcess(base, upperCase, pattern, length);
    }

	public static String convertByte(byte sourceValue, boolean upperCase, String pattern, int length) {
	    String base = Integer.toHexString(sourceValue);
	    if (base.length() == 8)
	    	base = base.substring(6);
	    return postProcess(base, upperCase, pattern, length);
    }

	public static String convertChar(Character sourceValue, boolean upperCase, String pattern, int length) {
		String base = convertInt(sourceValue, upperCase, null, 2);
		return postProcess(base, upperCase, pattern, length);
    }

	public static String convertString(String sourceValue, boolean upperCase, String pattern, int length) {
		StringBuilder builder = new StringBuilder(sourceValue.length() * 2);
		for (int i = 0; i < sourceValue.length() ; i++)
			builder.append(convertChar(sourceValue.charAt(i), upperCase, null, 2));
		return postProcess(builder.toString(), upperCase, pattern, length);
    }

	private static String postProcess(String base, boolean upperCase, String pattern, int length) {
	    if (upperCase)
	    	base = base.toUpperCase();
	    if (length > 0)
	    	base = StringUtil.padLeft(base, length, '0');
	    if (pattern != null)
	    	base = MessageFormat.format(pattern, base);
	    return base;
    }

}