/*
* @(#)PropertyExpander.java 1.12 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package sun.security.util;
// Note that there are two versions of this class, this subsetted
// version for CDC (which does not support the java.net.URI class)
// and a version in FP. Be sure you're editting the right one!
import java.security.GeneralSecurityException;
/**
* A utility class to expand properties embedded in a string.
* Strings of the form ${some.property.name} are expanded to
* be the value of the property. Also, the special ${/} property
* is expanded to be the same as file.separator. If a property
* is not set, a GeneralSecurityException will be thrown.
*
* @version 1.4
* @author Roland Schemers
*/
public class PropertyExpander {
public static class ExpandException extends GeneralSecurityException {
public ExpandException(String msg) {
super(msg);
}
}
public static String expand(String value)
throws ExpandException
{
return expand(value, false);
}
public static String expand(String value, boolean encodeURL)
throws ExpandException
{
if (value == null)
return null;
int p = value.indexOf("${", 0);
// no special characters
if (p == -1) return value;
StringBuffer sb = new StringBuffer(value.length());
int max = value.length();
int i = 0; // index of last character we copied
scanner:
while (p < max) {
if (p > i) {
// copy in anything before the special stuff
sb.append(value.substring(i, p));
i = p;
}
int pe = p+2;
// do not expand ${{ ... }}
if (pe < max && value.charAt(pe) == '{') {
pe = value.indexOf("}}", pe);
if (pe == -1 || pe+2 == max) {
// append remaining chars
sb.append(value.substring(p));
break scanner;
} else {
// append as normal text
pe++;
sb.append(value.substring(p, pe+1));
}
} else {
while ((pe < max) && (value.charAt(pe) != '}')) {
pe++;
}
if (pe == max) {
// no matching '}' found, just add in as normal text
sb.append(value.substring(p, pe));
break scanner;
}
String prop = value.substring(p+2, pe);
if (prop.equals("/")) {
sb.append(java.io.File.separatorChar);
} else {
String val = System.getProperty(prop);
if (val != null) {
/* CDC does not support java.net.URI. Use the
* J2SE code branch which avoids invoking
* URI.isAbsolute()
if (encodeURL) {
// encode 'val' unless it's an absolute URI
// at the beginning of the string buffer
try {
if (sb.length() > 0 ||
!(new URI(val)).isAbsolute()) {
val = sun.net.www.ParseUtil.encodePath(val);
}
} catch (URISyntaxException use) {
val = sun.net.www.ParseUtil.encodePath(val);
}
}
*/
val = sun.net.www.ParseUtil.encodePath(val);
sb.append(val);
} else {
throw new ExpandException(
"unable to expand property " +
prop);
}
}
}
i = pe+1;
p = value.indexOf("${", i);
if (p == -1) {
// no more to expand. copy in any extra
if (i < max) {
sb.append(value.substring(i, max));
}
// break out of loop
break scanner;
}
}
return sb.toString();
}
public static void main(String args[]) throws Exception
{
System.out.println(expand(args[0]));
}
}