JAVA properties保留注释

public class SafeProperties extends Properties {
private static final long serialVersionUID = 5011694856722313621L;

private static final String keyValueSeparators = "=: \t\r\n\f";

private static final String strictKeyValueSeparators = "=:";

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

private static final String whiteSpaceChars = " \t\r\n\f";

private PropertiesContext context = new PropertiesContext();

public PropertiesContext getContext() {
return context;
}

public synchronized void load(InputStream inStream) throws IOException {

BufferedReader in;

in = new BufferedReader(new InputStreamReader(inStream, "8859_1"));
while (true) {
// Get next line
String line = in.readLine();
// intract property/comment string
String intactLine = line;
if (line == null)
return;

if (line.length() > 0) {

// Find start of key
int len = line.length();
int keyStart;
for (keyStart = 0; keyStart < len; keyStart++)
if (whiteSpaceChars.indexOf(line.charAt(keyStart)) == -1)
break;

// Blank lines are ignored
if (keyStart == len)
continue;

// Continue lines that end in slashes if they are not comments
char firstChar = line.charAt(keyStart);

if ((firstChar != '#') && (firstChar != '!')) {
while (continueLine(line)) {
String nextLine = in.readLine();
intactLine = intactLine + "\n" + nextLine;
if (nextLine == null)
nextLine = "";
String loppedLine = line.substring(0, len - 1);
// Advance beyond whitespace on new line
int startIndex;
for (startIndex = 0; startIndex < nextLine.length(); startIndex++)
if (whiteSpaceChars.indexOf(nextLine.charAt(startIndex)) == -1)
break;
nextLine = nextLine.substring(startIndex, nextLine.length());
line = new String(loppedLine + nextLine);
len = line.length();
}

// Find separation between key and value
int separatorIndex;
for (separatorIndex = keyStart; separatorIndex < len; separatorIndex++) {
char currentChar = line.charAt(separatorIndex);
if (currentChar == '\\')
separatorIndex++;
else if (keyValueSeparators.indexOf(currentChar) != -1)
break;
}

// Skip over whitespace after key if any
int valueIndex;
for (valueIndex = separatorIndex; valueIndex < len; valueIndex++)
if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
break;

// Skip over one non whitespace key value separators if any
if (valueIndex < len)
if (strictKeyValueSeparators.indexOf(line.charAt(valueIndex)) != -1)
valueIndex++;

// Skip over white space after other separators if any
while (valueIndex < len) {
if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
break;
valueIndex++;
}
String key = line.substring(keyStart, separatorIndex);
String value = (separatorIndex < len) ? line.substring(valueIndex, len) : "";

// Convert then store key and value
key = loadConvert(key);
value = loadConvert(value);
//memorize the property also with the whold string
put(key, value, intactLine);
} else {
//memorize the comment string
context.addCommentLine(intactLine);
}
} else {
//memorize the string even the string is empty
context.addCommentLine(intactLine);
}
}
}

/*
* Converts encoded \uxxxx to unicode chars and changes special saved
* chars to their original forms
*/
private String loadConvert(String 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')
outBuffer.append('\t'); /* ibm@7211 */

else if (aChar == 'r')
outBuffer.append('\r'); /* ibm@7211 */
else if (aChar == 'n') {
/*
* ibm@8897 do not convert a \n to a line.separator
* because on some platforms line.separator is a String
* of "\r\n". When a Properties class is saved as a file
* (store()) and then restored (load()) the restored
* input MUST be the same as the output (so that
* Properties.equals() works).
*
*/
outBuffer.append('\n'); /* ibm@8897 ibm@7211 */
} else if (aChar == 'f')
outBuffer.append('\f'); /* ibm@7211 */
else
/* ibm@7211 */
outBuffer.append(aChar); /* ibm@7211 */
}
} else
outBuffer.append(aChar);
}
return outBuffer.toString();
}

public synchronized void store(OutputStream out, String header) throws IOException {
BufferedWriter awriter;
awriter = new BufferedWriter(new OutputStreamWriter(out, "8859_1"));
if (header != null)
writeln(awriter, "#" + header);
List entrys = context.getCommentOrEntrys();
for (Iterator iter = entrys.iterator(); iter.hasNext();) {
Object obj = iter.next();
if (obj.toString() != null) {
writeln(awriter, obj.toString());
}
}
awriter.flush();
}

private static void writeln(BufferedWriter bw, String s) throws IOException {
bw.write(s);
bw.newLine();
}

private boolean continueLine(String line) {
int slashCount = 0;
int index = line.length() - 1;
while ((index >= 0) && (line.charAt(index--) == '\\'))
slashCount++;
return (slashCount % 2 == 1);
}