/*!
* 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) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.libraries.css.resolver.function.values;
import java.net.URL;
import java.awt.Color;
import org.pentaho.reporting.libraries.css.resolver.function.FunctionUtilities;
import org.pentaho.reporting.libraries.css.resolver.function.StyleValueFunction;
import org.pentaho.reporting.libraries.css.resolver.FunctionEvaluationException;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import org.pentaho.reporting.libraries.css.values.CSSFunctionValue;
import org.pentaho.reporting.libraries.css.values.CSSColorValue;
import org.pentaho.reporting.libraries.css.values.CSSResourceValue;
import org.pentaho.reporting.libraries.css.values.CSSRawValue;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.util.ColorUtil;
import org.pentaho.reporting.libraries.resourceloader.Resource;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
public class AttrValueFunction implements StyleValueFunction
{
public AttrValueFunction()
{
}
public boolean isAutoResolveable()
{
return true;
}
public CSSValue evaluate(final DocumentContext 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]);
}
if (namespace == null || "".equals(namespace) || "*".equals(namespace))
{
final Object value = element.getAttribute(element.getNamespace(), name);
return convertValue(layoutProcess, value, type);
}
else
{
// thats easy.
final Object value = element.getAttribute(namespace, name);
return convertValue(layoutProcess, value, type);
}
}
private CSSValue convertValue(final DocumentContext 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);
}
}
}