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/*
* @(#)SysPropertiesUtil.java
*
* Copyright (C) 2002-2003 Matt Albrecht
* groboclown@users.sourceforge.net
* http://groboutils.sourceforge.net
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package net.sourceforge.groboutils.junit.v1;
import java.util.Properties;
import java.util.Vector;
import java.util.Enumeration;
//import java.lang.reflect.Method;
//import java.lang.reflect.InvocationTargetException;
/**
* Utility that allows for easy setting and reseting of System properties.
* Some classes that need testing may depend upon a System property setting,
* and this class will help testing that. This is JDK 1.1 and above
* compatible.
* <P>
* Each instance of this utility should be created in the <tt>setUp()</tt>
* method of the test case, then the utility should have its <tt>reset()</tt>
* method called in the <tt>tearDown()</tt> method. This ensures that the
* standard system properties have been set correctly.
*
* @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
* @version $Date: 2003/07/21 13:57:54 $
* @since December 26, 2002
*/
public class SysPropertiesUtil
{
private Properties originals;
private Properties newProps;
/**
* Each instance should be an instance variable for a test class, and
* it should be created in the <tt>setUp()</tt> method.
*/
public SysPropertiesUtil()
{
this.originals = System.getProperties();
restoreProps();
}
/**
* Sets the system property. If the new value is <tt>null</tt>, then
* the property, if it exists, will be removed. If the key is
* <tt>null</tt>, then an <tt>IllegalArgumentException</tt> will be thrown.
*/
public void setValue( String key, String newVal )
{
if (key == null)
{
throw new IllegalArgumentException( "No null keys." );
}
synchronized( this )
{
if (newVal == null)
{
this.newProps.remove( key );
}
else
{
this.newProps.setProperty( key, newVal );
}
setSystemProperties( this.newProps );
}
}
/**
* Resets the system properties to the way they were when this class was
* created.
*/
public synchronized void reset()
{
setSystemProperties( this.originals );
restoreProps();
}
private void setSystemProperties( Properties props )
{
System.setProperties( props );
}
private void restoreProps()
{
this.newProps = (Properties)this.originals.clone();
}
}
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