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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: ContentFunction.java 2739 2007-04-02 11:41:22Z taqua $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.functions.content;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.input.style.values.CSSFunctionValue;
import org.jfree.layouting.layouter.content.ContentToken;
import org.jfree.layouting.layouter.model.LayoutElement;
import org.jfree.layouting.layouter.style.functions.FunctionEvaluationException;
/**
* A content function is only valid when evaluating either the 'content'
* property or the 'string-set' property. These functions produce ContentToken.
*
* ContentFunctions are only valid as first-level functions. That means, when
* evaluating nested function calls like 'url(attr(blah))', the URL function
* will be resolved as ContentFunction, but the attr-function will be resolved
* as ordinary CSSValue function.
*
* @author Thomas Morgner
*/
public interface ContentFunction
{
public ContentToken evaluate (final LayoutProcess layoutProcess,
final LayoutElement element,
final CSSFunctionValue function)
throws FunctionEvaluationException;
}
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