📄 properties.java
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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();
}
/*
* Converts unicodes to encoded \uxxxx
* and writes out any of the characters in specialSaveChars
* with a preceding slash
*/
/**
* Description of the Method
*
*@param theString Description of the Parameter
*@param escapeSpace Description of the Parameter
*@return Description of the Return Value
*/
private String saveConvert(String theString, boolean escapeSpace) {
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();
}
/**
* Calls the <code>store(OutputStream out, String header)</code> method and
* suppresses IOExceptions that were thrown.
*
*@param out an output stream.
*@param header a description of the property list.
*@deprecated This method does not throw an IOException if an I/O error
* occurs while saving the property list. As of the Java 2 platform v1.2,
* the preferred way to save a properties list is via the <code>store(OutputStream out,
* String header)</code> method.
*/
public synchronized void save(OutputStream out, String header) {
try {
store(out, header);
}
catch (IOException e) {}
}
/**
* Writes this property list (key and element pairs) in this <code>Properties</code>
* table to the output stream in a format suitable for loading into a <code>Properties</code>
* table using the <code>load</code> method. The stream is written using the
* ISO 8859-1 character encoding. <p>
*
* Properties from the defaults table of this <code>Properties</code> table
* (if any) are <i>not</i> written out by this method. <p>
*
* If the header argument is not null, then an ASCII <code>#</code>
* character, the header string, and a line separator are first written to
* the output stream. Thus, the <code>header</code> can serve as an
* identifying comment. <p>
*
* Next, a comment line is always written, consisting of an ASCII <code>#</code>
* character, the current date and time (as if produced by the <code>toString</code>
* method of <code>Date</code> for the current time), and a line separator as
* generated by the Writer. <p>
*
* Then every entry in this <code>Properties</code> table is written out, one
* per line. For each entry the key string is written, then an ASCII <code>=</code>
* , then the associated element string. Each character of the element string
* is examined to see whether it should be rendered as an escape sequence.
* The ASCII characters <code>\</code>, tab, newline, and carriage return are
* written as <code>\\</code>, <code>\t</code>, <code>\n</code>, and <code>\r</code>
* , respectively. Characters less than <code>\u0020</code> and
* characters greater than <code>\u007E</code> are written as <code>\u</code>
* <i>xxxx</i> for the appropriate hexadecimal value <i>xxxx</i> . Leading
* space characters, but not embedded or trailing space characters, are
* written with a preceding <code>\</code>. The key and value characters
* <code>#</code>, <code>!</code> , <code>=</code>, and <code>:</code> are
* written with a preceding slash to ensure that they are properly loaded.
* <p>
*
* After the entries have been written, the output stream is flushed. The
* output stream remains open after this method returns.
*
*@param out an output stream.
*@param header a description of the property list.
*@exception IOException if writing this property list to the specified
* output stream throws an <tt>IOException</tt> .
*@since 1.2
*/
public synchronized void store(OutputStream out, String header) throws IOException {
BufferedWriter awriter;
awriter = new BufferedWriter(new OutputStreamWriter(out));
if (header != null) {
writeln(awriter, "#" + header);
}
writeln(awriter, "#" + new Date().toString());
for (Enumeration e = keys(); e.hasMoreElements();) {
String key = (String)e.nextElement();
String val = (String)get(key);
key = saveConvert(key, true);
/*
* No need to escape embedded and trailing spaces for value, hence
* pass false to flag.
*/
val = saveConvert(val, false);
writeln(awriter, key + "=" + val);
}
awriter.flush();
}
/**
* Description of the Method
*
*@param bw Description of the Parameter
*@param s Description of the Parameter
*@exception IOException Description of the Exception
*/
private static void writeln(BufferedWriter bw, String s) throws IOException {
bw.write(s);
bw.newLine();
}
/**
* Searches for the property with the specified key in this property list. If
* the key is not found in this property list, the default property list, and
* its defaults, recursively, are then checked. The method returns <code>null</code>
* if the property is not found.
*
*@param key the property key.
*@return the value in this property list with the specified key value.
*@see #setProperty
*@see #defaults
*/
public String getProperty(String key) {
Object oval = super.get(key);
String sval = (oval instanceof String) ? (String)oval : null;
return ((sval == null) && (defaults != null)) ? defaults.getProperty(key) : sval;
}
/**
* Searches for the property with the specified key in this property list. If
* the key is not found in this property list, the default property list, and
* its defaults, recursively, are then checked. The method returns the
* default value argument if the property is not found.
*
*@param key the hashtable key.
*@param defaultValue a default value.
*@return the value in this property list with the specified key
* value.
*@see #setProperty
*@see #defaults
*/
public String getProperty(String key, String defaultValue) {
String val = getProperty(key);
return (val == null) ? defaultValue : val;
}
/**
* Returns an enumeration of all the keys in this property list, including
* distinct keys in the default property list if a key of the same name has
* not already been found from the main properties list.
*
*@return an enumeration of all the keys in this property list, including
* the keys in the default property list.
*@see java.util.Enumeration
*@see java.util.Properties#defaults
*/
public Enumeration propertyNames() {
Hashtable h = new Hashtable();
enumerate(h);
return h.keys();
}
/**
* Prints this property list out to the specified output stream. This method
* is useful for debugging.
*
*@param out an output stream.
*/
public void list(PrintStream out) {
out.println("-- listing properties --");
Hashtable h = new Hashtable();
enumerate(h);
for (Enumeration e = h.keys(); e.hasMoreElements();) {
String key = (String)e.nextElement();
String val = (String)h.get(key);
if (val.length() > 40) {
val = val.substring(0, 37) + "...";
}
out.println(key + "=" + val);
}
}
/**
* Prints this property list out to the specified output stream. This method
* is useful for debugging.
*
*@param out an output stream.
*@since JDK1.1
*/
/*
* Rather than use an anonymous inner class to share common code, this
* method is duplicated in order to ensure that a non-1.1 compiler can
* compile this file.
*/
public void list(PrintWriter out) {
out.println("-- listing properties --");
Hashtable h = new Hashtable();
enumerate(h);
for (Enumeration e = h.keys(); e.hasMoreElements();) {
String key = (String)e.nextElement();
String val = (String)h.get(key);
if (val.length() > 40) {
val = val.substring(0, 37) + "...";
}
out.println(key + "=" + val);
}
}
/**
* Enumerates all key/value pairs in the specified hastable.
*
*@param h the hashtable
*/
private synchronized void enumerate(Hashtable h) {
if (defaults != null) {
defaults.enumerate(h);
}
for (Enumeration e = keys(); e.hasMoreElements();) {
String key = (String)e.nextElement();
h.put(key, get(key));
}
}
/**
* Convert a nibble to a hex character
*
*@param nibble the nibble to convert.
*@return Description of the Return Value
*/
private static char toHex(int nibble) {
return hexDigit[(nibble & 0xF)];
}
/**
* A table of hex digits
*/
private final static char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
}
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