/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.layout.process;
import org.pentaho.reporting.engine.classic.core.layout.model.LayoutNodeTypes;
import org.pentaho.reporting.engine.classic.core.layout.model.RenderBox;
import org.pentaho.reporting.engine.classic.core.layout.model.RenderNode;
/**
* By keeping the shifting in a separate class, we can optimize it later without having to touch the other code.
* Remember: Recursive calls can be evil in complex documents..
*
* @author Thomas Morgner
*/
public final class CacheBoxShifter
{
private CacheBoxShifter()
{
}
public static void shiftBox(final RenderNode box, final long amount)
{
if (amount == 0)
{
return;
}
if (amount < 0)
{
throw new IllegalArgumentException("Cannot shift upwards: " + amount);
}
box.shiftCached(amount);
if ((box.getNodeType() & LayoutNodeTypes.MASK_BOX) == LayoutNodeTypes.MASK_BOX)
{
CacheBoxShifter.shiftBoxInternal((RenderBox) box, amount);
}
}
public static void shiftBoxUnchecked(final RenderNode box, final long amount)
{
if (amount == 0)
{
return;
}
box.shiftCached(amount);
if ((box.getNodeType() & LayoutNodeTypes.MASK_BOX) == LayoutNodeTypes.MASK_BOX)
{
CacheBoxShifter.shiftBoxInternal((RenderBox) box, amount);
}
}
public static void shiftBoxChilds(final RenderBox box, final long amount)
{
if (amount == 0)
{
return;
}
CacheBoxShifter.shiftBoxInternal(box, amount);
}
private static void shiftBoxInternal(final RenderBox box, final long amount)
{
RenderNode node = box.getFirstChild();
while (node != null)
{
node.shiftCached(amount);
if ((node.getNodeType() & LayoutNodeTypes.MASK_BOX) == LayoutNodeTypes.MASK_BOX)
{
CacheBoxShifter.shiftBoxInternal((RenderBox) node, amount);
}
node = node.getNext();
}
}
public static void extendHeight(final RenderNode node, final long amount)
{
if (amount < 0)
{
throw new IllegalArgumentException("Cannot shrink elements.");
}
if (node == null || amount == 0)
{
return;
}
node.setCachedHeight(node.getCachedHeight() + amount);
RenderBox parent = node.getParent();
while (parent != null)
{
parent.setCachedHeight(parent.getCachedHeight() + amount);
parent = parent.getParent();
}
}
}