de.pentabyte.maven.i18n.format.java.NoTimestampProperties Maven / Gradle / Ivy

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package de.pentabyte.maven.i18n.format.java;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.Enumeration;
import java.util.Properties;

/**
 * Private Methods have been copied from Properties. Sole difference to the
 * original: no timestamp will be written, because this causes unecessary
 * conflicts with source control. Plus: the original "store" Method had a bug
 * related to the escaping of apostrophes.
 * 
 * @author Michael Höreth
 * 
 */
public class NoTimestampProperties extends Properties {
	private static final long serialVersionUID = -2620453710662538476L;

	@Override
	public void store(OutputStream out, String comments) throws IOException {
		// Latin1 is the JAVA standard for property files.
		store0(new BufferedWriter(new OutputStreamWriter(out, "8859_1")), comments, true);
	}

	private void store0(BufferedWriter bw, String comments, boolean escUnicode) throws IOException {
		if (comments != null) {
			writeComments(bw, comments);
		}

		synchronized (this) {
			for (Enumeration e = keys(); e.hasMoreElements();) {
				String key = (String) e.nextElement();
				String val = (String) get(key);
				key = saveConvert(key, true, escUnicode);
				/*
				 * No need to escape embedded and trailing spaces for value,
				 * hence pass false to flag.
				 */
				val = saveConvert(val, false, escUnicode);
				bw.write(key + "=" + val);
				bw.newLine();
			}
		}
		bw.flush();
	}

	private static void writeComments(BufferedWriter bw, String comments) throws IOException {
		bw.write("#");
		int len = comments.length();
		int current = 0;
		int last = 0;
		char[] uu = new char[6];
		uu[0] = '\\';
		uu[1] = 'u';
		while (current < len) {
			char c = comments.charAt(current);
			if (c > '\u00ff' || c == '\n' || c == '\r') {
				if (last != current)
					bw.write(comments.substring(last, current));
				if (c > '\u00ff') {
					uu[2] = toHex((c >> 12) & 0xf);
					uu[3] = toHex((c >> 8) & 0xf);
					uu[4] = toHex((c >> 4) & 0xf);
					uu[5] = toHex(c & 0xf);
					bw.write(new String(uu));
				} else {
					bw.newLine();
					if (c == '\r' && current != len - 1 && comments.charAt(current + 1) == '\n') {
						current++;
					}
					if (current == len - 1
							|| (comments.charAt(current + 1) != '#' && comments.charAt(current + 1) != '!'))
						bw.write("#");
				}
				last = current + 1;
			}
			current++;
		}
		if (last != current)
			bw.write(comments.substring(last, current));
		bw.newLine();
	}

	/**
	 * Convert a nibble to a hex character
	 * 
	 * @param nibble
	 *            the nibble to convert.
	 */
	private static char toHex(int nibble) {
		return hexDigit[(nibble & 0xF)];
	}

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

	/*
	 * Converts unicodes to encoded \uxxxx and escapes special characters
	 * with a preceding slash
	 */
	private String saveConvert(String theString, boolean escapeSpace, boolean escapeUnicode) {
		int len = theString.length();
		int bufLen = len * 2;
		if (bufLen < 0) {
			bufLen = Integer.MAX_VALUE;
		}
		StringBuffer outBuffer = new StringBuffer(bufLen);

		for (int x = 0; x < len; x++) {
			char aChar = theString.charAt(x);
			// Handle common case first, selecting largest block that
			// avoids the specials below
			if ((aChar > 61) && (aChar < 127)) {
				if (aChar == '\\') {
					outBuffer.append('\\');
					outBuffer.append('\\');
					continue;
				}
				outBuffer.append(aChar);
				continue;
			}
			switch (aChar) {
			case ' ':
				if (x == 0 || escapeSpace)
					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;
			case '=': // Fall through
			case ':': // Fall through
			case '#': // Fall through
			case '!':
				outBuffer.append('\\');
				outBuffer.append(aChar);
				break;
			default:
				if (((aChar < 0x0020) || (aChar > 0x007e)) & escapeUnicode) {
					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 {
					outBuffer.append(aChar);
				}
			}
		}
		return outBuffer.toString();
	}
}