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/**
* ===========================================
* LibLayout : a free Java layouting library
* ===========================================
*
* Project Info: http://reporting.pentaho.org/liblayout/
*
* (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: LayoutStylePool.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style;
import org.jfree.layouting.layouter.context.LayoutStyle;
/**
* This class does not work as expected as long as we have no clear life-cycle
* for the layout-style classes.
*/
public class LayoutStylePool
{
private static class LayoutStyleReference
{
private boolean inUse;
private LayoutStyle referent;
/**
* Creates a new soft reference that refers to the given object. The new reference is
* not registered with any queue.
*
* @param referent object the new soft reference will refer to
*/
private LayoutStyleReference (final LayoutStyle referent)
{
this.referent = referent;
inUse = true;
}
/**
* Returns this reference object's referent. If this reference object has been cleared,
* either by the program or by the garbage collector, then this method returns
* <code>null</code>.
*
* @return The object to which this reference refers, or <code>null</code> if this
* reference object has been cleared
*/
public Object get ()
{
return referent;
}
public boolean isInUse ()
{
return inUse;
}
public void setInUse (final boolean inUse)
{
this.inUse = inUse;
}
}
private static LayoutStylePool pool;
public static synchronized LayoutStylePool getPool ()
{
if (pool == null)
{
pool = new LayoutStylePool();
}
return pool;
}
// private LayoutStyleReference[] storage;
private int cursor;
private LayoutStylePool ()
{
// storage = new LayoutStyleReference[32];
}
public synchronized LayoutStyleImpl getStyle ()
{
return new LayoutStyleImpl();
//
// final int oldCursor = cursor;
// if (oldCursor == 0)
// {
// final LayoutStyleImpl retval = seekUpTo(storage.length);
// if (retval == null)
// {
// // return new LayoutStyle();
// // todo: This is a deadly stupid construct.
// throw new OutOfMemoryError("Pool was invalid.");
// }
// return retval;
// }
//
// final LayoutStyleImpl retval = seekUpTo(storage.length);
// if (retval != null)
// {
// return retval;
// }
// cursor = 0;
// final LayoutStyleImpl secondRun = seekUpTo(oldCursor - 1);
// if (secondRun == null)
// {
// throw new OutOfMemoryError("Pool was invalid.");
// }
// return secondRun;
}
//
// private LayoutStyleImpl seekUpTo (final int limit)
// {
// for (; cursor < limit; cursor++)
// {
// LayoutStyleReference reference = storage[cursor];
// if (reference == null)
// {
// final LayoutStyleImpl referent = new LayoutStyleImpl();
// storage[cursor] = new LayoutStyleReference(referent);
// referent.setReference(storage[cursor]);
// cursor += 1;
// return referent;
// }
// if (reference.isInUse())
// {
// continue;
// }
//
// final LayoutStyleImpl style = (LayoutStyleImpl) reference.get();
// if (style != null)
// {
// reference.setInUse(true);
// return style;
// }
// else
// {
// final LayoutStyleImpl referent = new LayoutStyleImpl();
// storage[cursor] = new LayoutStyleReference(referent);
// referent.setReference(storage[cursor]);
// cursor += 1;
// return referent;
// }
// }
// return null;
// }
public synchronized void reclaim (final LayoutStyle layoutStyle,
final Object reference)
{
final LayoutStyleReference ref = (LayoutStyleReference) reference;
ref.setInUse(false);
}
}
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