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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: ConstantsResolveHandler.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.resolver.computed;
import java.util.HashMap;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.input.style.StyleKey;
import org.jfree.layouting.input.style.values.CSSConstant;
import org.jfree.layouting.input.style.values.CSSValue;
import org.jfree.layouting.layouter.context.LayoutContext;
import org.jfree.layouting.layouter.model.LayoutElement;
import org.jfree.layouting.layouter.style.resolver.ResolveHandler;
/**
* Creation-Date: 11.12.2005, 23:15:57
*
* @author Thomas Morgner
*/
public abstract class ConstantsResolveHandler implements ResolveHandler
{
private static final StyleKey[] EMPTY_STYLE_KEYS = new StyleKey[0];
private HashMap constants;
private CSSValue fallback;
protected ConstantsResolveHandler()
{
constants = new HashMap();
}
public CSSValue getFallback()
{
return fallback;
}
protected void setFallback(final CSSValue fallback)
{
this.fallback = fallback;
}
protected CSSValue lookupValue(final CSSConstant value)
{
return (CSSValue) constants.get(value);
}
protected void addValue(final CSSConstant constant, final CSSValue value)
{
constants.put(constant, value);
}
protected void addNormalizeValue(final CSSConstant constant)
{
constants.put(constant, constant);
}
/**
* This indirectly defines the resolve order. The higher the order, the more
* dependent is the resolver on other resolvers to be complete.
*
* @return the array of required style keys.
*/
public StyleKey[] getRequiredStyles()
{
return EMPTY_STYLE_KEYS;
}
/**
* Resolves a single property.
*
* @param currentNode
* @param style
*/
public void resolve(final LayoutProcess process,
final LayoutElement currentNode,
final StyleKey key)
{
final CSSValue value = resolveValue(process, currentNode, key);
if (value != null)
{
currentNode.getLayoutContext().setValue(key, value);
}
}
protected CSSValue resolveValue (final LayoutProcess process,
final LayoutElement currentNode,
final StyleKey key)
{
final LayoutContext layoutContext = currentNode.getLayoutContext();
final CSSValue value = layoutContext.getValue(key);
if (value instanceof CSSConstant == false)
{
final CSSValue fallback = getFallback();
if (fallback != null)
{
return fallback;
}
return null;
}
final CSSConstant constant = (CSSConstant) value;
final CSSValue resolvedValue = lookupValue(constant);
if (resolvedValue != null)
{
// layoutContext.setValue(key, resolvedValue);
return resolvedValue;
}
final CSSValue fallback = getFallback();
if (fallback != null)
{
// layoutContext.setValue(key, fallback);
return fallback;
}
return null;
}
}
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