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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: AttrValueFunction.java 6489 2008-11-28 14:53:40Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.functions.values;
import java.awt.Color;
import java.net.URL;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.input.style.values.CSSColorValue;
import org.jfree.layouting.input.style.values.CSSFunctionValue;
import org.jfree.layouting.input.style.values.CSSValue;
import org.jfree.layouting.layouter.model.LayoutElement;
import org.jfree.layouting.layouter.style.functions.FunctionEvaluationException;
import org.jfree.layouting.layouter.style.functions.FunctionUtilities;
import org.jfree.layouting.layouter.style.values.CSSRawValue;
import org.jfree.layouting.layouter.style.values.CSSResourceValue;
import org.jfree.layouting.util.AttributeMap;
import org.jfree.layouting.util.ColorUtil;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.Resource;
/**
* Creation-Date: 15.04.2006, 18:33:56
*
* @author Thomas Morgner
*/
public class AttrValueFunction implements StyleValueFunction
{
public AttrValueFunction()
{
}
public CSSValue evaluate(final LayoutProcess layoutProcess,
final LayoutElement element,
final CSSFunctionValue function)
throws FunctionEvaluationException
{
final CSSValue[] params = function.getParameters();
if (params.length < 2)
{
throw new FunctionEvaluationException
("The parsed attr() function needs at least two parameters.");
}
final String namespace = FunctionUtilities.resolveString
(layoutProcess, element, params[0]);
final String name = FunctionUtilities.resolveString
(layoutProcess, element, params[1]);
String type = null;
if (params.length >= 3)
{
type = FunctionUtilities.resolveString(layoutProcess, element, params[2]);
}
final AttributeMap attributes = element.getLayoutContext().getAttributes();
if (namespace == null || "".equals(namespace))
{
final Object value = attributes.getAttribute
(element.getLayoutContext().getNamespace(), name);
return convertValue(layoutProcess, value, type);
}
else if ("*".equals(namespace))
{
// this is a lot of work. Query all attributes in all namespaces...
final Object value = attributes.getFirstAttribute(name);
return convertValue(layoutProcess, value, type);
}
else
{
// thats easy.
final Object value = attributes.getAttribute
(namespace, name);
return convertValue(layoutProcess, value, type);
}
}
private CSSValue convertValue(final LayoutProcess layoutProcess,
final Object value,
final String type)
throws FunctionEvaluationException
{
if (value instanceof CSSValue)
{
throw new FunctionEvaluationException();
}
if (value instanceof String)
{
final String strVal = (String) value;
if ("length".equals(type))
{
return FunctionUtilities.parseNumberValue(strVal);
}
else if ("url".equals(type))
{
return FunctionUtilities.loadResource(layoutProcess, strVal);
}
else if ("color".equals(type))
{
final CSSValue colorValue = ColorUtil.parseColor(strVal);
if (colorValue == null)
{
throw new FunctionEvaluationException();
}
return colorValue;
}
else
{
// auto-mode. We check for URLs, as this is required for images
return FunctionUtilities.parseValue(layoutProcess, strVal);
}
}
else if (value instanceof URL)
{
return FunctionUtilities.loadResource(layoutProcess, value);
}
else if (value instanceof Resource)
{
return new CSSResourceValue((Resource) value);
}
else if (value instanceof ResourceKey)
{
return FunctionUtilities.loadResource(layoutProcess, value);
}
else if (value instanceof Number)
{
return FunctionUtilities.parseNumberValue(value.toString(), type);
}
else if (value instanceof Color)
{
final Color color = (Color) value;
return new CSSColorValue
(color.getRed(), color.getGreen(),
color.getBlue(), color.getAlpha());
}
else
{
return new CSSRawValue(value);
}
}
}
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