donaldp 02/04/25 19:53:21
Added: aut/src/java/org/apache/aut/jprocess
SysPropertiesRedirector.java
Log:
Add in a class that installs redirector
for System properties and redirects to
per thread proeprties object.
Revision Changes Path
1.1
jakarta-ant-myrmidon/aut/src/java/org/apache/aut/jprocess/SysPropertiesRedirector.java
Index: SysPropertiesRedirector.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.aut.jprocess;
import java.io.IOException;
import java.util.Properties;
/**
* This is a utility class that makes it easy to install redirecting
* Properties objects underlying System.getProeprties() object.
* The properties object will redirect to the properties object that is
* associated with the current thread. A properties object becomes
* associated with the current thread when a user calls one of the
* bind*() methods or by inheriting the parent threads properties object
* when thread is initially created. The default streams will redirect
* to the default System properties.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Peter Donald</a>
* @version $Revision: 1.1 $ $Date: 2002/04/26 02:53:21 $
*/
public final class SysPropertiesRedirector
{
private static final String NOT_INSTALLED_ERR =
"SysPropertiesRedirector not installed";
/**
* Cached version of original System Properties.
* (Or at least the properties that were installed in JVM
* when this class is loaded and resovled).
*/
private static final Properties c_systemProperties =
System.getProperties();
private static DemuxProperties c_properties;
/**
* Private constructor to block instantiation.
*/
private SysPropertiesRedirector()
{
}
/**
* Install the redirecting Properties object.
*
* @return true if installed, false if already installed
*/
public synchronized static boolean install()
throws IOException
{
if( c_properties == System.getProperties() )
{
//Already installed so lets ignore
return false;
}
c_properties = new DemuxProperties( c_systemProperties );
System.setProperties( c_properties );
return true;
}
/**
* Uninstall the redirecting streams and
* replace them with streams that point to
* FileDescriptor.in, FileDescriptor.out and
* FileDescriptor.err.
*
* @return true if uninstalled, false if already uninstalled
*/
public synchronized static boolean uninstall()
throws IOException
{
if( c_properties != System.getProperties() )
{
//Already uninstalled so lets ignore
return false;
}
c_properties = null;
System.setProperties( c_systemProperties );
return true;
}
/**
* Bind the specified Properties object to this thread.
*
* @param properties the stream to bind
* @throws SecurityException if don't have permission to bind to input
* @throws IllegalStateException if redirector not installed
*/
public static void bindProperties( final Properties properties )
throws SecurityException, IllegalStateException
{
if( null == properties )
{
throw new NullPointerException( "properties" );
}
if( null == c_properties )
{
throw new IllegalStateException( NOT_INSTALLED_ERR );
}
final SecurityManager manager = System.getSecurityManager();
if( null != manager )
{
final RuntimePermission permission =
new RuntimePermission(
"SysPropertiesRedirector.setProperties" );
manager.checkPermission( permission );
}
c_properties.bindProperties( properties );
}
}
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