StringConverterUtility.java

package com.idega.core.converter.util;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;

import org.apache.commons.io.IOUtils;

import com.idega.util.StringUtil;

/**
 * Command line utility to convert resource string files with native characters
 * into escape-based UTF strings Takes 2 parameters - first is the input file
 * name (with full path) which exists locally, second is the name of the result
 * output file.
 */
public class StringConverterUtility {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		if (args.length == 2) {
			String inputFile = args[0];
			String outputFile = args[1];

			BufferedReader in = null;
			try {
				String line;
				in = new BufferedReader(new FileReader(inputFile));
				FileWriter out = new FileWriter(outputFile);
				while ((line = in.readLine()) != null) {

					String UTF8Str = new String(line.getBytes(), "UTF-8");

					int index = UTF8Str.indexOf("=");
					if (index > 0) {
						String key = UTF8Str.substring(0, index);
						String value = UTF8Str.substring(index + 1, UTF8Str.length());
						value = saveConvert(value, false);

						out.write(key);
						out.write("=");
						out.write(value);
						out.write("\n");
					}
				}

				out.flush();
				out.close();
			}
			catch (FileNotFoundException e) {
				System.out.println("Input file not found: " + inputFile);
			}
			catch (Exception ex) {
				System.out.println("Error converting: " + ex.getMessage());
			}
			finally {
				IOUtils.closeQuietly(in);
			}
		}

	}

	public static String saveConvert(String theString, boolean escapeSpace) {
		if (theString == null) {
			theString = "";
		}

		int len = theString.length();
		StringBuffer outBuffer = new StringBuffer(len * 2);

		for (int x = 0; x < len; x++) {
			char aChar = theString.charAt(x);
			switch (aChar) {
			case ' ':
				if (x == 0 || escapeSpace) {
					outBuffer.append('\\');
				}

				outBuffer.append(' ');
				break;
			case '\\':
				outBuffer.append('\\');
				outBuffer.append('\\');
				break;
			case '\t':
				outBuffer.append('\\');
				outBuffer.append('t');
				break;
			case '\n':
				outBuffer.append('\\');
				outBuffer.append('n');
				break;
			case '\r':
				outBuffer.append('\\');
				outBuffer.append('r');
				break;
			case '\f':
				outBuffer.append('\\');
				outBuffer.append('f');
				break;
			default:
				if ((aChar < 0x0020) || (aChar > 0x007e)) {
					outBuffer.append('\\');
					outBuffer.append('u');
					outBuffer.append(toHex((aChar >> 12) & 0xF));
					outBuffer.append(toHex((aChar >> 8) & 0xF));
					outBuffer.append(toHex((aChar >> 4) & 0xF));
					outBuffer.append(toHex(aChar & 0xF));
				}
				else {
					if (specialSaveChars.indexOf(aChar) != -1) {
						outBuffer.append('\\');
					}
					outBuffer.append(aChar);
				}
			}
		}
		return outBuffer.toString();
	}

	private static char toHex(int nibble) {
		return hexDigit[(nibble & 0xF)];
	}

	private static final char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

	private static final String specialSaveChars = "=: \t\r\n\f#!";

	/**
	 * Converts encoded \\uxxxx to unicode chars and changes special saved chars
	 * to their original forms
	 */
	public static String loadConvert(String theString) {
		if (StringUtil.isEmpty(theString)) {
			return theString;
		}

		char aChar;
		int len = theString.length();
		StringBuffer outBuffer = new StringBuffer(len);

		for (int x = 0; x < len;) {

			aChar = theString.charAt(x++);

			if (aChar == '\\') {

				aChar = theString.charAt(x++);

				if (aChar == 'u') {

					// Read the xxxx

					int value = 0;

					for (int i = 0; i < 4; i++) {

						aChar = theString.charAt(x++);

						switch (aChar)

						{

						case '0':
						case '1':
						case '2':
						case '3':
						case '4':
						case '5':
						case '6':
						case '7':
						case '8':
						case '9':

							value = (value << 4) + aChar - '0';

							break;

						case 'a':
						case 'b':
						case 'c':
						case 'd':
						case 'e':
						case 'f':

							value = (value << 4) + 10 + aChar - 'a';

							break;

						case 'A':
						case 'B':
						case 'C':
						case 'D':
						case 'E':
						case 'F':

							value = (value << 4) + 10 + aChar - 'A';

							break;

						default:

							throw new IllegalArgumentException("Malformed \\uxxxx encoding.");

						}

					}

					outBuffer.append((char) value);

				}
				else {

					if (aChar == 't')
						aChar = '\t';

					else if (aChar == 'r')
						aChar = '\r';
					else if (aChar == 'n')
						aChar = '\n';
					else if (aChar == 'f')
						aChar = '\f';

					outBuffer.append(aChar);

				}

			}

			else

			{
				outBuffer.append(aChar);

			}

		}

		return outBuffer.toString();

	}

}