/*
* This file is part of FFMQ.
*
* FFMQ is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFMQ 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with FFMQ; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.timewalker.ffmq4.utils;
/**
* SystemTools
*/
public class SystemTools
{
/**
* Replace system properties in the given string value
* @param value a string value
* @return the expanded value
*/
public static String replaceSystemProperties( String value )
{
// Dumb case
if (value == null || value.length() == 0)
return value;
StringBuilder sb = new StringBuilder();
int pos = 0;
int start;
while ((start = value.indexOf("${",pos)) != -1)
{
if (start > pos)
sb.append(value.substring(pos,start));
int end = value.indexOf('}',start+2);
if (end == -1)
{
pos = start;
break;
}
String varName = value.substring(start+2,end);
String varValue = System.getProperty(varName,"${"+varName+"}");
sb.append(varValue);
pos = end+1;
}
// Append remaining
if (pos < value.length())
sb.append(value.substring(pos));
return sb.toString();
}
}