/**
* ===========================================
* 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: FlowContext.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.normalizer.displaymodel;
import org.jfree.layouting.layouter.context.LayoutContext;
import org.jfree.layouting.util.IntList;
import org.jfree.util.FastStack;
/**
* Creation-Date: Jan 5, 2007, 4:30:53 PM
*
* @author Thomas Morgner
*/
public class FlowContext implements Cloneable
{
public static final int STATE_OPEN = 0;
public static final int STATE_SUSPEND = 1;
public static final int STATE_CLOSE = 2;
private IntList displayModels;
private IntList displayRoles;
private IntList elementState;
private FastStack layoutContexts;
private int activeContext;
public FlowContext()
{
displayModels = new IntList(30);
displayRoles = new IntList(30);
elementState = new IntList(30);
layoutContexts = new FastStack();
}
public void addElement(final int model, final int role, final LayoutContext lc)
{
displayModels.push(model);
displayRoles.push(role);
elementState.push(STATE_OPEN);
layoutContexts.push(lc);
activeContext = displayModels.size() - 1;
}
public int getCurrentDisplayRole()
{
if (displayRoles.size() == 0)
{
return FastDisplayModelBuilder.TYPE_BLOCK;
}
return displayRoles.get(activeContext);
}
public int getCurrentDisplayModel()
{
if (displayModels.size() == 0)
{
return FastDisplayModelBuilder.MODEL_BLOCK_INSIDE;
}
return displayModels.get(activeContext);
}
public int getActiveDisplayModel()
{
if (displayModels.size() == 0)
{
return FastDisplayModelBuilder.MODEL_BLOCK_INSIDE;
}
int index = activeContext;
while (elementState.get(index) == STATE_SUSPEND)
{
index -= 1;
}
return displayModels.get(index);
}
public void suspend()
{
final int state = elementState.get(activeContext);
if (state != STATE_OPEN)
{
throw new IllegalStateException("Only open elements can be suspended.");
}
elementState.set(activeContext, STATE_SUSPEND);
// find the next non-suspended element.
while (elementState.get(activeContext) == STATE_SUSPEND)
{
activeContext -= 1;
}
}
public int close()
{
final int state = elementState.pop();
displayRoles.pop();
displayModels.pop();
layoutContexts.pop();
activeContext = Math.min (activeContext - 1, elementState.size());
return state;
}
public LayoutContext getCurrentLayoutContext()
{
return (LayoutContext) layoutContexts.peek();
}
public int getCurrentState()
{
return elementState.peek();
}
public Object clone () throws CloneNotSupportedException
{
final FlowContext c = (FlowContext) super.clone();
c.displayModels = (IntList) displayModels.clone();
c.displayRoles = (IntList) displayRoles.clone();
c.elementState = (IntList) elementState.clone();
c.layoutContexts = (FastStack) layoutContexts.clone();
return c;
}
public boolean isEmpty()
{
return layoutContexts.isEmpty();
}
}