489 lines
18 KiB
Java
489 lines
18 KiB
Java
/* java.util.Properties
|
|
Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
As a special exception, if you link this library with other files to
|
|
produce an executable, this library does not by itself cause the
|
|
resulting executable to be covered by the GNU General Public License.
|
|
This exception does not however invalidate any other reasons why the
|
|
executable file might be covered by the GNU General Public License. */
|
|
|
|
|
|
package java.util;
|
|
import java.io.*;
|
|
|
|
/**
|
|
* An example of a properties file for the german language is given
|
|
* here. This extends the example given in ListResourceBundle.
|
|
* Create a file MyResource_de.properties with the following contents
|
|
* and put it in the CLASSPATH. (The character
|
|
* <code>\</code><code>u00e4</code> is the german ä)
|
|
*
|
|
* <pre>
|
|
* s1=3
|
|
* s2=MeineDisk
|
|
* s3=3. M\<code></code>u00e4rz 96
|
|
* s4=Die Diskette ''{1}'' enth\<code></code>u00e4lt {0} in {2}.
|
|
* s5=0
|
|
* s6=keine Dateien
|
|
* s7=1
|
|
* s8=eine Datei
|
|
* s9=2
|
|
* s10={0,number} Dateien
|
|
* s11=Das Formatieren schlug fehl mit folgender Exception: {0}
|
|
* s12=FEHLER
|
|
* s13=Ergebnis
|
|
* s14=Dialog
|
|
* s15=Auswahlkriterium
|
|
* s16=1,3
|
|
* </pre>
|
|
*
|
|
* Although this is a sub class of a hash table, you should never
|
|
* insert anything other than strings to this property, or several
|
|
* methods, that need string keys and values, will fail. To ensure
|
|
* this, you should use the <code>get/setProperty</code> method instead
|
|
* of <code>get/put</code>.
|
|
*
|
|
* @see PropertyResourceBundle
|
|
* @author Jochen Hoenicke */
|
|
public class Properties extends Hashtable {
|
|
/**
|
|
* The property list that contains default values for any keys not
|
|
* in this property list.
|
|
*/
|
|
protected Properties defaults;
|
|
|
|
private static final long serialVersionUID = 4112578634029874840L;
|
|
|
|
/**
|
|
* Creates a new empty property list.
|
|
*/
|
|
public Properties() {
|
|
this.defaults = null;
|
|
}
|
|
|
|
/**
|
|
* Create a new empty property list with the specified default values.
|
|
* @param defaults a Properties object containing the default values.
|
|
*/
|
|
public Properties(Properties defaults) {
|
|
this.defaults = defaults;
|
|
}
|
|
|
|
/**
|
|
* Reads a property list from an input stream. The stream should
|
|
* have the following format: <br>
|
|
*
|
|
* An empty line or a line starting with <code>#</code> or
|
|
* <code>!</code> is ignored. An backslash (<code>\</code>) at the
|
|
* end of the line makes the line continueing on the next line
|
|
* (but make sure there is no whitespace after the backslash).
|
|
* Otherwise, each line describes a key/value pair. <br>
|
|
*
|
|
* The chars up to the first whitespace, = or : are the key. You
|
|
* can include this caracters in the key, if you precede them with
|
|
* a backslash (<code>\</code>). The key is followed by optional
|
|
* whitespaces, optionally one <code>=</code> or <code>:</code>,
|
|
* and optionally some more whitespaces. The rest of the line is
|
|
* the resource belonging to the key. <br>
|
|
*
|
|
* Escape sequences <code>\t, \n, \r, \\, \", \', \!, \#, \ </code>(a
|
|
* space), and unicode characters with the
|
|
* <code>\</code><code>u</code>xxxx notation are detected, and
|
|
* converted to the corresponding single character. <br>
|
|
*
|
|
* <pre>
|
|
* # This is a comment
|
|
* key = value
|
|
* k\:5 \ a string starting with space and ending with newline\n
|
|
* # This is a multiline specification; note that the value contains
|
|
* # no white space.
|
|
* weekdays: Sunday,Monday,Tuesday,Wednesday,\
|
|
* Thursday,Friday,Saturday
|
|
* # The safest way to include a space at the end of a value:
|
|
* label = Name:\<code></code>u0020
|
|
* </pre>
|
|
*
|
|
* @param in the input stream
|
|
* @exception IOException if an error occured when reading
|
|
* from the input. */
|
|
public void load(InputStream inStream) throws IOException {
|
|
BufferedReader reader =
|
|
new BufferedReader(new InputStreamReader(inStream));
|
|
String line;
|
|
while ((line = reader.readLine()) != null) {
|
|
char c = 0;
|
|
int pos = 0;
|
|
while (pos < line.length()
|
|
&& Character.isWhitespace(c = line.charAt(pos)))
|
|
pos++;
|
|
|
|
// If line is empty or begins with a comment character,
|
|
// skip this line.
|
|
if (pos == line.length() || c == '#' || c == '!')
|
|
continue;
|
|
|
|
// The characaters up to the next Whitespace, ':', or '='
|
|
// describe the key. But look for escape sequences.
|
|
StringBuffer key = new StringBuffer();
|
|
while (pos < line.length()
|
|
&& !Character.isWhitespace(c = line.charAt(pos++))
|
|
&& c != '=' && c != ':') {
|
|
if (c == '\\') {
|
|
if (pos == line.length()) {
|
|
// The line continues on the next line.
|
|
line = reader.readLine();
|
|
pos = 0;
|
|
while (pos < line.length()
|
|
&& Character.isWhitespace(c = line.charAt(pos)))
|
|
pos++;
|
|
} else {
|
|
c = line.charAt(pos++);
|
|
switch (c) {
|
|
case 'n':
|
|
key.append('\n');
|
|
break;
|
|
case 't':
|
|
key.append('\t');
|
|
break;
|
|
case 'r':
|
|
key.append('\r');
|
|
break;
|
|
case 'u':
|
|
if (pos+4 <= line.length()) {
|
|
char uni = (char) Integer.parseInt
|
|
(line.substring(pos, pos+4), 16);
|
|
key.append(uni);
|
|
} // else throw exception?
|
|
break;
|
|
default:
|
|
key.append(c);
|
|
break;
|
|
}
|
|
}
|
|
} else
|
|
key.append(c);
|
|
}
|
|
|
|
boolean isDelim = (c == ':' || c == '=');
|
|
while (pos < line.length()
|
|
&& Character.isWhitespace(c = line.charAt(pos)))
|
|
pos++;
|
|
|
|
if (!isDelim && (c == ':' || c == '=')) {
|
|
pos++;
|
|
while (pos < line.length()
|
|
&& Character.isWhitespace(c = line.charAt(pos)))
|
|
pos++;
|
|
}
|
|
|
|
StringBuffer element = new StringBuffer(line.length()-pos);
|
|
while (pos < line.length()) {
|
|
c = line.charAt(pos++);
|
|
if (c == '\\') {
|
|
if (pos == line.length()) {
|
|
// The line continues on the next line.
|
|
line = reader.readLine();
|
|
pos = 0;
|
|
while (pos < line.length()
|
|
&& Character.isWhitespace(c = line.charAt(pos)))
|
|
pos++;
|
|
element.ensureCapacity(line.length()-pos+element.length());
|
|
} else {
|
|
c = line.charAt(pos++);
|
|
switch (c) {
|
|
case 'n':
|
|
element.append('\n');
|
|
break;
|
|
case 't':
|
|
element.append('\t');
|
|
break;
|
|
case 'r':
|
|
element.append('\r');
|
|
break;
|
|
case 'u':
|
|
if (pos+4 <= line.length()) {
|
|
char uni = (char) Integer.parseInt
|
|
(line.substring(pos, pos+4), 16);
|
|
element.append(uni);
|
|
} // else throw exception?
|
|
break;
|
|
default:
|
|
element.append(c);
|
|
break;
|
|
}
|
|
}
|
|
} else
|
|
element.append(c);
|
|
}
|
|
put(key.toString(), element.toString());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calls <code>store(OutputStream out, String header)</code> and
|
|
* ignores the IOException that may be thrown.
|
|
* @deprecated use store instead.
|
|
* @exception ClassCastException if this property contains any key or
|
|
* value that isn't a string.
|
|
*/
|
|
public void save(OutputStream out, String header) {
|
|
try {
|
|
store(out,header);
|
|
} catch (IOException ex) {
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes the key/value pairs to the given output stream. <br>
|
|
*
|
|
* If header is not null, this method writes a comment containing
|
|
* the header as first line to the stream. The next line (or first
|
|
* line if header is null) contains a comment with the current date.
|
|
* Afterwards the key/value pairs are written to the stream in the
|
|
* following format. <br>
|
|
*
|
|
* Each line has the form <code>key = value</code>. Newlines,
|
|
* Returns and tabs are written as <code>\n,\t,\r</code> resp.
|
|
* The characters <code>\, !, #, =</code> and <code>:</code> are
|
|
* preceeded by a backslash. Spaces are preceded with a backslash,
|
|
* if and only if they are at the beginning of the key. Characters
|
|
* that are not in the ascii range 33 to 127 are written in the
|
|
* <code>\</code><code>u</code>xxxx Form.
|
|
*
|
|
* @param out the output stream
|
|
* @param header the header written in the first line, may be null.
|
|
* @exception ClassCastException if this property contains any key or
|
|
* value that isn't a string.
|
|
*/
|
|
public void store(OutputStream out, String header) throws IOException {
|
|
PrintWriter writer = new PrintWriter(out);
|
|
if (header != null)
|
|
writer.println("#"+header);
|
|
writer.println("#"+new Date().toString());
|
|
list(writer);
|
|
writer.flush();
|
|
}
|
|
|
|
/**
|
|
* Adds the given key/value pair to this properties. This calls
|
|
* the hashtable method put.
|
|
* @param key the key for this property
|
|
* @param value the value for this property
|
|
* @return The old value for the given key.
|
|
* @since JDK1.2 */
|
|
public Object setProperty(String key, String value) {
|
|
return put(key,value);
|
|
}
|
|
|
|
/**
|
|
* Gets the property with the specified key in this property list.
|
|
* If the key is not found, the default property list is searched.
|
|
* If the property is not found in default or the default of
|
|
* default, null is returned.
|
|
* @param key The key for this property.
|
|
* @param defaulValue A default value
|
|
* @return The value for the given key, or null if not found.
|
|
* @exception ClassCastException if this property contains any key or
|
|
* value that isn't a string.
|
|
*/
|
|
public String getProperty(String key) {
|
|
return getProperty(key, null);
|
|
}
|
|
|
|
/**
|
|
* Gets the property with the specified key in this property list. If
|
|
* the key is not found, the default property list is searched. If the
|
|
* property is not found in default or the default of default, the
|
|
* specified defaultValue is returned.
|
|
* @param key The key for this property.
|
|
* @param defaulValue A default value
|
|
* @return The value for the given key.
|
|
* @exception ClassCastException if this property contains any key or
|
|
* value that isn't a string.
|
|
*/
|
|
public String getProperty(String key, String defaultValue) {
|
|
Properties prop = this;
|
|
// Eliminate tail recursion.
|
|
do {
|
|
String value = (String) prop.get(key);
|
|
if (value != null)
|
|
return value;
|
|
prop = prop.defaults;
|
|
} while (prop != null);
|
|
return defaultValue;
|
|
}
|
|
|
|
private final void addHashEntries (Hashtable base) {
|
|
if (defaults != null)
|
|
defaults.addHashEntries(base);
|
|
Enumeration keys = keys ();
|
|
while (keys.hasMoreElements())
|
|
base.put(keys.nextElement(), base);
|
|
}
|
|
|
|
/**
|
|
* Returns an enumeration of all keys in this property list, including
|
|
* the keys in the default property list.
|
|
*/
|
|
public Enumeration propertyNames () {
|
|
// We make a new Hashtable that holds all the keys. Then we
|
|
// return an enumeration for this hash. We do this because we
|
|
// don't want modifications to be reflected in the enumeration
|
|
// (per JCL), and because there doesn't seem to be a
|
|
// particularly better way to ensure that duplicates are
|
|
// ignored.
|
|
Hashtable t = new Hashtable ();
|
|
addHashEntries (t);
|
|
return t.keys();
|
|
}
|
|
|
|
/**
|
|
* Formats a key/value pair for output in a properties file.
|
|
* See store for a description of the format.
|
|
* @param key the key.
|
|
* @param value the value.
|
|
* @see #store
|
|
*/
|
|
private String formatForOutput(String key, String value) {
|
|
// This is a simple approximation of the expected line size.
|
|
StringBuffer result = new StringBuffer(key.length()+value.length()+16);
|
|
boolean head = true;
|
|
for (int i=0; i< key.length(); i++) {
|
|
char c = key.charAt(i);
|
|
switch (c) {
|
|
case '\n':
|
|
result.append("\\n");
|
|
break;
|
|
case '\r':
|
|
result.append("\\r");
|
|
break;
|
|
case '\t':
|
|
result.append("\\t");
|
|
break;
|
|
case '\\':
|
|
result.append("\\\\");
|
|
break;
|
|
case '!':
|
|
result.append("\\!");
|
|
break;
|
|
case '#':
|
|
result.append("\\#");
|
|
break;
|
|
case '=':
|
|
result.append("\\=");
|
|
break;
|
|
case ':':
|
|
result.append("\\:");
|
|
break;
|
|
case ' ':
|
|
result.append("\\ ");
|
|
break;
|
|
default:
|
|
if (c < 32 || c > '~') {
|
|
String hex = Integer.toHexString(c);
|
|
result.append("\\u0000".substring(0, 6-hex.length()));
|
|
result.append(hex);
|
|
} else
|
|
result.append(c);
|
|
}
|
|
if (c != 32)
|
|
head = false;
|
|
}
|
|
result.append('=');
|
|
head=true;
|
|
for (int i=0; i< value.length(); i++) {
|
|
char c = value.charAt(i);
|
|
switch (c) {
|
|
case '\n':
|
|
result.append("\\n");
|
|
break;
|
|
case '\r':
|
|
result.append("\\r");
|
|
break;
|
|
case '\t':
|
|
result.append("\\t");
|
|
break;
|
|
case '\\':
|
|
result.append("\\\\");
|
|
break;
|
|
case '!':
|
|
result.append("\\!");
|
|
break;
|
|
case '#':
|
|
result.append("\\#");
|
|
break;
|
|
case ' ':
|
|
result.append(head ? "\\ ": " ");
|
|
break;
|
|
default:
|
|
if (c < 32 || c > '~') {
|
|
String hex = Integer.toHexString(c);
|
|
result.append("\\u0000".substring(0, 6-hex.length()));
|
|
result.append(hex);
|
|
} else
|
|
result.append(c);
|
|
}
|
|
if (c != 32)
|
|
head = false;
|
|
}
|
|
return result.toString();
|
|
}
|
|
|
|
/**
|
|
* Writes the key/value pairs to the given print stream. They are
|
|
* written in the way, described in the method store.
|
|
* @param out the stream, where the key/value pairs are written to.
|
|
* @exception ClassCastException if this property contains any key or
|
|
* value that isn't a string.
|
|
* @see #store
|
|
*/
|
|
public void list(PrintStream out) {
|
|
Enumeration keys = keys();
|
|
Enumeration elts = elements();
|
|
while (keys.hasMoreElements()) {
|
|
String key = (String) keys.nextElement();
|
|
String elt = (String) elts.nextElement();
|
|
String output = formatForOutput(key,elt);
|
|
out.println(output);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes the key/value pairs to the given print writer. They are
|
|
* written in the way, described in the method store.
|
|
* @param out the writer, where the key/value pairs are written to.
|
|
* @exception ClassCastException if this property contains any key or
|
|
* value that isn't a string.
|
|
* @see #store
|
|
* @see #list(java.io.PrintStream)
|
|
* @since JDK1.1
|
|
*/
|
|
public void list(PrintWriter out) {
|
|
Enumeration keys = keys();
|
|
Enumeration elts = elements();
|
|
while (keys.hasMoreElements()) {
|
|
String key = (String) keys.nextElement();
|
|
String elt = (String) elts.nextElement();
|
|
String output = formatForOutput(key,elt);
|
|
out.println(output);
|
|
}
|
|
}
|
|
}
|