uk.org.retep.util.misc.Support Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2007, Peter T Mount
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the retep.org.uk nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package uk.org.retep.util.misc;
/** This class provides some utility methods. These include alternatives to
* Class.forName() etc. However because of problems when running under
* different environments (NetBeans is the main one), the actual calls are
* delegated to an alternative class.
*
* @author peter
*/
public final class Support
{
// The global singleton instance
private static final Support SINGLETON = new Support();
// The current delegate
private Delegate del;
/** Private constructor - use getInstance() to retrieve the instance.
*/
private Support()
{
}
public static Support getInstance()
{
return SINGLETON;
}
/** Return the delegate in use, auto detecting it if not set
*/
public Delegate getDelegate()
{
if(del==null)
{
synchronized(this)
{
if(del==null)
{
try
{
setDelegate((Support.Delegate) Class.forName("uk.org.retep.nb.NBSupport").newInstance());
}
catch(Exception ex)
{
// Not found, so use default implementation
setDelegate(new Support.Delegate());
}
}
}
}
return del;
}
/** Set the Support.Delegate to use. Normally this is detected automatically,
* but you can overide it by using this method. Setting it to null will force
* it to be re-detected.
*/
public void setDelegate(Support.Delegate aDelegate)
{
del = aDelegate;
}
public Class forName(String aName) throws ClassNotFoundException
{
return getDelegate().forName(aName);
}
public Object newInstance(Class aClass) throws InstantiationException, IllegalAccessException
{
return getDelegate().newInstance(aClass);
}
public Object newInstance(String aName) throws ClassNotFoundException,InstantiationException, IllegalAccessException
{
return newInstance(forName(aName));
}
/** Default implementation of the delegate. Sub classes may overide individual
* methods for special purposes.
*/
public static class Delegate
{
/** Constructor. Sub classes must call super() to cover future versions of this
* class.
*/
public Delegate()
{
}
public Class forName(String aName) throws ClassNotFoundException
{
return Class.forName(aName);
}
public Object newInstance(Class aClass) throws InstantiationException, IllegalAccessException
{
return aClass.newInstance();
}
public ClassLoader getLoader()
{
return ClassLoader.getSystemClassLoader();
}
}
}
/*
* $Log: Support.java,v $
* Revision 1.4 2007/01/06 16:56:25 peter
* Fixed copyright to account for 2007
*
* Revision 1.3 2006/09/10 22:24:35 peter
* Code cleanup and some changes to new package layout
*
* Revision 1.2 2003/06/26 11:18:10 petermount
* Added license to classes. Added TreeNode
*
* Revision 1.1 2003/06/26 11:01:22 petermount
* This class was missing from the CVS, althoug it's been here for at least 9 month! oops...
*
*/