/*
* @(#)Properties.java 1.84 04/05/18
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.util;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
/**
* The <code>Properties</code> class represents a persistent set of
* properties. The <code>Properties</code> can be saved to a stream
* or loaded from a stream. Each key and its corresponding value in
* the property list is a string.
* <p>
* A property list can contain another property list as its
* "defaults"; this second property list is searched if
* the property key is not found in the original property list.
* <p>
* Because <code>Properties</code> inherits from <code>Hashtable</code>, the
* <code>put</code> and <code>putAll</code> methods can be applied to a
* <code>Properties</code> object. Their use is strongly discouraged as they
* allow the caller to insert entries whose keys or values are not
* <code>Strings</code>. The <code>setProperty</code> method should be used
* instead. If the <code>store</code> or <code>save</code> method is called
* on a "compromised" <code>Properties</code> object that contains a
* non-<code>String</code> key or value, the call will fail.
* <p>
* <a name="encoding"></a>
* <p> The {@link #load load} and {@link #store store} methods load and store
* properties in a simple line-oriented format specified below. This format
* uses the ISO 8859-1 character encoding. Characters that cannot be directly
* represented in this encoding can be written using
* <a href="http://java.sun.com/docs/books/jls/html/3.doc.html#100850">Unicode escapes</a>
* ; only a single 'u' character is allowed in an escape
* sequence. The native2ascii tool can be used to convert property files to and
* from other character encodings.
* <p>
* <p> The {@link #loadFromXML(InputStream)} and {@link
* #storeToXML(OutputStream, String, String)} methods load and store properties
* in a simple XML format. By default the UTF-8 character encoding is used,
* however a specific encoding may be specified if required. An XML properties
* document has the following DOCTYPE declaration:
*
* <pre>
* <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
* </pre>
* Note that the system URI (http://java.sun.com/dtd/properties.dtd) is
* <i>not</i> accessed when exporting or importing properties; it merely
* serves as a string to uniquely identify the DTD, which is:
* <pre>
* <?xml version="1.0" encoding="UTF-8"?>
*
* <!-- DTD for properties -->
*
* <!ELEMENT properties ( comment?, entry* ) >
*
* <!ATTLIST properties version CDATA #FIXED "1.0">
*
* <!ELEMENT comment (#PCDATA) >
*
* <!ELEMENT entry (#PCDATA) >
*
* <!ATTLIST entry key CDATA #REQUIRED>
* </pre>
*
* @see <a href="../../../tooldocs/solaris/native2ascii.html">native2ascii tool for Solaris</a>
* @see <a href="../../../tooldocs/windows/native2ascii.html">native2ascii tool for Windows</a>
*
* @author Arthur van Hoff
* @author Michael McCloskey
* @version 1.84, 05/18/04
* @since JDK1.0
*/
public
class Properties extends Hashtable<Object,Object> {
/**
* use serialVersionUID from JDK 1.1.X for interoperability
*/
private static final long serialVersionUID = 4112578634029874840L;
/**
* A property list that contains default values for any keys not
* found in this property list.
*
* @serial
*/
protected Properties defaults;
/**
* Creates an empty property list with no default values.
*/
public Properties() {
this(null);
}
/**
* Creates an empty property list with the specified defaults.
*
* @param defaults the defaults.
*/
public Properties(Properties defaults) {
this.defaults = defaults;
}
/**
* Calls the <tt>Hashtable</tt> method <code>put</code>. Provided for
* parallelism with the <tt>getProperty</tt> method. Enforces use of
* strings for property keys and values. The value returned is the
* result of the <tt>Hashtable</tt> call to <code>put</code>.
*
* @param key the key to be placed into this property list.
* @param value the value corresponding to <tt>key</tt>.
* @return the previous value of the specified key in this property
* list, or <code>null</code> if it did not have one.
* @see #getProperty
* @since 1.2
*/
public synchronized Object setProperty(String key, String value) {
return put(key, value);
}
/**
* Reads a property list (key and element pairs) from the input
* stream. The stream is assumed to be using the ISO 8859-1
* character encoding; that is each byte is one Latin1 character.
* Characters not in Latin1, and certain special characters, can
* be represented in keys and elements using escape sequences
* similar to those used for character and string literals (see <a
* href="http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html#100850">§3.3</a>
* and <a
* href="http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html#101089">§3.10.6</a>
* of the <i>Java Language Specification</i>).
*
* The differences from the character escape sequences used for
* characters and strings are:
*
* <ul>
* <li> Octal escapes are not recognized.
*
* <li> The character sequence <code>\b</code> does <i>not</i>
* represent a backspace character.
*
* <li> The method does not treat a backslash character,
* <code>\</code>, before a non-valid escape character as an
* error; the backslash is silently dropped. For example, in a
* Java string the sequence <code>"\z"</code> would cause a
* compile time error. In contrast, this method silently drops
* the backslash. Therefore, this method treats the two character
* sequence <code>"\b"</code> as equivalent to the single
* character <code>'b'</code>.
*
* <li> Escapes are not necessary for single and double quotes;
* however, by the rule above, single and double quote characters
* preceded by a backslash still yield single and double quote
* characters, respectively.
*
* </ul>
*
* An <code>IllegalArgumentException</code> is thrown if a
* malformed Unicode escape appears in the input.
*
* <p>
* This method processes input in terms of lines. A natural line
* of input is terminated either by a set of line terminator
* characters (<code>\n</code> or <code>\r</code> or
* <code>\r\n</code>) or by the end of the file. A natural line
* may be either a blank line, a comment line, or hold some part
* of a key-element pair. The logical line holding all the data
* for a key-element pair may be spread out across several adjacent
* natural lines by escaping the line terminator sequence with a
* backslash character, <code>\</code>. Note that a comment line
* cannot be extended in this manner; every natural line that is a
* comment must have its own comment indicator, as described
* below. If a logical line is continued over several natural
* lines, the continuation lines receive further processing, also
* described below. Lines are read from the input stream until
* end of file is reached.
*
* <p>
* A natural line that contains only white space characters is
* considered blank and is ignored. A comment line has an ASCII
* <code>'#'</code> or <code>'!'</code> as its first non-white
* space character; comment lines are also ignored and do not
* encode key-element information. In addition to line
* terminators, this method considers the characters space
* (<code>' '</code>, <code>'\u0020'</code>), tab
* (<code>'\t'</code>, <code>'\u0009'</code>), and form feed
* (<code>'\f'</code>, <code>'\u000C'</code>) to be white
* space.
*
* <p>
* If a logical line is spread across several natural lines, the
* backslash escaping the line terminator sequence, the line
* terminator sequence, and any white space at the start the
* following line have no affect on the key or element values.
* The remainder of the discussion of key and element parsing will
* assume all the characters constituting the key and element
* appear on a single natural line after line continuation
* characters have been removed. Note that it is <i>not</i>
* sufficient to only examine the character preceding a line
* terminator sequence to see if the line terminator is
* escaped; there must be an odd number of contiguous backslashes
* for the line terminator to be escaped. Since the input is
* processed from left to right, a non-zero even number of
* 2<i>n</i> contiguous backslashes before a line terminator (or
* elsewhere) encodes <i>n</i> backslashes after escape
* processing.
*
* <p>
* The key contains all of the characters in the line starting
* with the first non-white space character and up to, but not
* including, the first unescaped <code>'='</code>,
* <code>':'</code>, or white space character other than a line
* terminator. All of these key termination characters may be
* included in the key by escaping them with a preceding backslash
* character; for example,<p>
*
* <code>\:\=</code><p>
*
* would be the two-character key <code>":="</code>. Line
* terminator characters can be included using <code>\r</code> and
* <code>\n</code> escape sequences. Any white space after the
* key is skipped; if the first non-white space character after
* the key is <code>'='</code> or <code>':'</code>, then it is
* ignored and any white space characters after it are also
* skipped. All remaining characters on the line become part of
* the associated element string; if there are no remaining
* characters, the element is the empty string
* <code>""</code>. Once the raw character sequences
* constituting the key and element are identified, escape
* processing is performed as described above.
*
* <p>
* As an example, each of the following three lines specifies the key
* <code>"Truth"</code> and the associated element value
* <code>"Beauty"</code>:
* <p>
* <pre>
* Truth = Beauty
* Truth:Beauty
* Truth :Beauty
* </pre>
* As another example, the following three lines specify a single
* property:
* <p>
* <pre>
* fruits apple, banana, pear, \
* cantaloupe, watermelon, \
* kiwi, mango
* </pre>
* The key is <code>"fruits"</code> and the associated element is:
* <p>
* <pre>"apple, banana, pear, cantaloupe, watermelon, kiwi, mango"</pre>
* Note that a space appears before each <code>\</code> so that a space
* will appear after each comma in the final result; the <code>\</code>,
* line terminator, and leading white space on the continuation line are
* merely discarded and are <i>not</i> replaced by one or more other
* characters.
* <p>
* As a third example, the line:
* <p>
* <pre>cheeses
* </pre>
* specifies that the key is <code>"cheeses"</code> and the associated
* element is the empty string <code>""</code>.<p>
*
* @param inStream the input stream.
* @exception IOException if an error occurred when reading from the
* input stream.
* @throws IllegalArgumentException if the input stream contains a
* malformed Unicode escape sequence.
*/
public synchronized void load(InputStream inStream) throws IOException {
char[] convtBuf = new char[1024];
LineReader lr = new LineReader(inStream);
int limit;
int keyLen;
int valueStart;
char c;
boolean hasSep;
boolean precedingBackslash;
while ((limit = lr.readLine()) >= 0) {
c = 0;
keyLen = 0;
valueStart = limit;
hasSep = false;
//System.out.println("line=<" + new String(lineBuf, 0, limit) + ">");
precedingBackslash = false;
while (keyLen < limit) {
c = lr.lineBuf[keyLen];
//need check if escaped.
if ((c == '=' || c == ':') && !precedingBackslash) {
valueStart = keyLen + 1;
hasSep = true;
break;
} else if ((c == ' ' || c == '\t' || c == '\f') && !precedingBackslash) {
valueStart = keyLen + 1;
break;
}
if (c == '\\') {
precedingBackslash = !precedingBackslash;
} else {
precedingBackslash = false;
}
keyLen++;
}
while (valueStart < limit) {
c = lr.lineBuf[valueStart];
if (c != ' ' && c != '\t' && c != '\f') {
if (!hasSep && (c == '=' || c == ':')) {
hasSep = true;
} else {
break;
}
}
valueStart++;
}
String key = loadConvert(lr.lineBuf, 0, keyLen, convtBuf);
String value = loadConvert(lr.lineBuf, valueStart, limit - valueStart, convtBuf);
put(key, value);
}
}
/* read in a "logical line" from input stream, skip all comment and
* blank lines and filter out those leading whitespace characters
* (\u0020, \u0009 and \u000c) from the beginning of a "natural line".
* Method returns the char length of the "logical line" and stores
* the line in "lineBuf".
*/
class LineReader {
public LineReader(InputStream inStream) {
this.inStream = inStream;
}
byte[] inBuf = new byte[8192];
char[] lineBuf = new char[1024];
int inLimit = 0;
int inOff = 0;
InputStream inStream;
int readLine() throws IOException {
int len = 0;
char c = 0;
boolean skipWhiteSpace = true;
boolean isCommentLine = false;
boolean isNewLine = true;
boolean appendedLineBegin = false;
boolean precedingBackslash = false;
boolean skipLF = false;
while (true) {
if (inOff >= inLimit) {
inLimit = inStream.read(inBuf);
inOff = 0;
if (inLimit <= 0) {
if (len == 0 || isCommentLine) {
return -1;
}
return len;
}
}
//The line below is equivalent to calling a
//ISO8859-1 decoder.
c = (char) (0xff & inBuf[inOff++]);
if (skipLF) {
skipLF = false;
if (c == '\n') {
continue;
}
}
if (skipWhiteSpace) {
if (c == ' ' || c == '\t' || c == '\f') {
continue;
}
if (!appendedLineBegin && (c == '\r' || c == '\n')) {
continue;
}
skipWhiteSpace = false;
appendedLineBegin = false;
}
if (isNewLine) {
isNewLine = false;
if (c == '#' || c == '!') {
isCommentLine = true;
continue;
}
}
if (c != '\n' && c != '\r') {
lineBuf[len++] = c;
if (len == lineBuf.length) {
int newLength = lineBuf.length * 2;
if (newLength < 0) {
newLength = Integer.MAX_VALUE;
}
char[] buf = new char[newLength];
System.arraycopy(lineBuf, 0, buf, 0, lineBuf.length);
lineBuf = buf;
}
//flip the preceding backslash flag
if (c == '\\') {
precedingBackslash = !precedingBackslash;
} else {
precedingBackslash = false;
}
}
else {
// reached EOL
if (isCommentLine || len == 0) {
isCommentLine = false;
isNewLine = true;
skipWhiteSpace = true;
len = 0;
continue;
}
if (inOff >= inLimit) {
inLimit = inStream.read(inBuf);
inOff = 0;
if (inLimit <= 0) {
return len;
}
}
if (precedingBackslash) {
len -= 1;
//skip the leading whitespace characters in following line
skipWhiteSpace = true;
appendedLineBegin = true;
precedingBackslash = false;
if (c == '\r') {
skipLF = true;
}
} else {
return len;
}
}
}
}
}
/*
* Converts encoded \uxxxx to unicode chars
* and changes special saved chars to their original forms
*/
private String loadConvert (char[] in, int off, int len, char[] convtBuf) {
if (convtBuf.length < len) {
int newLen = len * 2;
if (newLen < 0) {
newLen = Integer.MAX_VALUE;
}
convtBuf = new char[newLen];
}
char aChar;
char[] out = convtBuf;
int outLen = 0;
int end = off + len;
while (off < end) {
aChar = in[off++];
if (aChar == '\\') {
aChar = in[off++];
if(aChar == 'u') {
// Read the xxxx
int value=0;
for (int i=0; i<4; i++) {
aChar = in[off++];
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.");
}
}
out[outLen++] = (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';
out[outLen++] = aChar;
}
} else {
out[outLen++] = (char)aChar;
}
}
return new String (out, 0, outLen);
}
/*
* Converts unicodes to encoded \uxxxx and escapes
* special characters with a preceding slash
*/
private String saveConvert(String theString, boolean escapeSpace) {
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)) {
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();
}
/**
* Calls the <code>store(OutputStream out, String comments)</code> method
* and suppresses IOExceptions that were thrown.
*
* @deprecated This method does not throw an IOException if an I/O error
* occurs while saving the property list. The preferred way to save a
* properties list is via the <code>store(OutputStream out,
* String comments)</code> method or the
* <code>storeToXML(OutputStream os, String comment)</code> method.
*
* @param out an output stream.
* @param comments a description of the property list.
* @exception ClassCastException if this <code>Properties</code> object
* contains any keys or values that are not
* <code>Strings</code>.
*/
@Deprecated
public synchronized void save(OutputStream out, String comments) {
try {
store(out, comments);
} 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
* {@link #load(InputStream) load} 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 comments argument is not null, then an ASCII <code>#</code>
* character, the comments string, and a line separator are first written
* to the output stream. Thus, the <code>comments</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 key and element strings
* is examined to see whether it should be rendered as an escape
* sequence. The ASCII characters <code>\</code>, tab, form feed,
* newline, and carriage return are written as <code>\\</code>,
* <code>\t</code>, <code>\f</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>. For the key, all space characters are
* written with a preceding <code>\</code> character. For the
* element, leading space characters, but not embedded or trailing
* space characters, are written with a preceding <code>\</code>
* character. The key and element characters <code>#</code>,
* <code>!</code>, <code>=</code>, and <code>:</code> are written
* with a preceding backslash 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 comments a description of the property list.
* @exception IOException if writing this property list to the specified
* output stream throws an <tt>IOException</tt>.
* @exception ClassCastException if this <code>Properties</code> object
* contains any keys or values that are not <code>Strings</code>.
* @exception NullPointerException if <code>out</code> is null.
* @since 1.2
*/
public synchronized void store(OutputStream out, String comments)
throws IOException
{
BufferedWriter awriter;
awriter = new BufferedWriter(new OutputStreamWriter(out, "8859_1"));
if (comments != null)
writeln(awriter, "#" + comments);
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();
}
private static void writeln(BufferedWriter bw, String s) throws IOException {
bw.write(s);
bw.newLine();
}
/**
* Loads all of the properties represented by the XML document on the
* specified input stream into this properties table.
*
* <p>The XML document must have the following DOCTYPE declaration:
* <pre>
* <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
* </pre>
* Furthermore, the document must satisfy the properties DTD described
* above.
*
* <p>The specified stream remains open after this method returns.
*
* @param in the input stream from which to read the XML document.
* @throws IOException if reading from the specified input stream
* results in an <tt>IOException</tt>.
* @throws InvalidPropertiesFormatException Data on input stream does not
* constitute a valid XML document with the mandated document type.
* @throws NullPointerException if <code>in</code> is null.
* @see #storeToXML(OutputStream, String, String)
* @since 1.5
*/
public synchronized void loadFromXML(InputStream in)
throws IOException, InvalidPropertiesFormatException
{
if (in == null)
throw new NullPointerException();
XMLUtils.load(this, in);
}
/**
* Emits an XML document representing all of the properties contained
* in this table.
*
* <p> An invocation of this method of the form <tt>props.storeToXML(os,
* comment)</tt> behaves in exactly the same way as the invocation
* <tt>props.storeToXML(os, comment, "UTF-8");</tt>.
*
* @param os the output stream on which to emit the XML document.
* @param comment a description of the property list, or <code>null</code>
* if no comment is desired.
* @throws IOException if writing to the specified output stream
* results in an <tt>IOException</tt>.
* @throws NullPointerException if <code>os</code> is null.
* @see #loadFromXML(InputStream)
* @since 1.5
*/
public synchronized void storeToXML(OutputStream os, String comment)
throws IOException
{
if (os == null)
throw new NullPointerException();
storeToXML(os, comment, "UTF-8");
}
/**
* Emits an XML document representing all of the properties contained
* in this table, using the specified encoding.
*
* <p>The XML document will have the following DOCTYPE declaration:
* <pre>
* <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
* </pre>
*
*<p>If the specified comment is <code>null</code> then no comment
* will be stored in the document.
*
* <p>The specified stream remains open after this method returns.
*
* @param os the output stream on which to emit the XML document.
* @param comment a description of the property list, or <code>null</code>
* if no comment is desired.
* @throws IOException if writing to the specified output stream
* results in an <tt>IOException</tt>.
* @throws NullPointerException if <code>os</code> is <code>null</code>,
* or if <code>encoding</code> is <code>null</code>.
* @see #loadFromXML(InputStream)
* @since 1.5
*/
public synchronized void storeToXML(OutputStream os, String comment,
String encoding)
throws IOException
{
if (os == null)
throw new NullPointerException();
XMLUtils.save(this, os, comment, encoding);
}
/**
* 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 hashtable.
* @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.
*/
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'
};
}
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