/*!
* 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.content;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.resolver.FunctionEvaluationException;
import org.pentaho.reporting.libraries.css.resolver.function.ContentFunction;
import org.pentaho.reporting.libraries.css.resolver.function.FunctionUtilities;
import org.pentaho.reporting.libraries.css.resolver.tokens.ContentToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.statics.ExternalContentToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.statics.ResourceContentToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.statics.StaticTextToken;
import org.pentaho.reporting.libraries.css.util.ColorUtil;
import org.pentaho.reporting.libraries.css.values.CSSFunctionValue;
import org.pentaho.reporting.libraries.css.values.CSSNumericValue;
import org.pentaho.reporting.libraries.css.values.CSSResourceValue;
import org.pentaho.reporting.libraries.css.values.CSSStringValue;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import org.pentaho.reporting.libraries.resourceloader.Resource;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import java.net.URL;
import java.util.Date;
/**
* Creation-Date: 15.04.2006, 18:33:56
*
* @author Thomas Morgner
*/
public class AttrValueFunction implements ContentFunction {
public AttrValueFunction() {
}
public ContentToken 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 ) ) {
final Object value = element.getAttribute( element.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 = element.getAttribute( "*", name );
return convertValue( layoutProcess, value, type );
} else {
// thats easy.
final Object value = element.getAttribute( namespace, name );
return convertValue( layoutProcess, value, type );
}
}
private ContentToken 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 ) ) {
final CSSNumericValue cssNumericValue = FunctionUtilities.parseNumberValue( strVal );
return new StaticTextToken( cssNumericValue.getCSSText() );
} else if ( "url".equals( type ) ) {
final CSSResourceValue cssResourceValue = FunctionUtilities.loadResource( layoutProcess, strVal );
final Resource resource = cssResourceValue.getValue();
return new ResourceContentToken( resource );
} else if ( "color".equals( type ) ) {
final CSSValue colorValue = ColorUtil.parseColor( strVal );
if ( colorValue == null ) {
throw new FunctionEvaluationException();
}
return new StaticTextToken( colorValue.getCSSText() );
} else {
// auto-mode. We check for URLs, as this is required for images
final CSSValue cssValue = FunctionUtilities.parseValue( layoutProcess, strVal );
if ( cssValue instanceof CSSResourceValue ) {
final CSSResourceValue cssResourceValue = (CSSResourceValue) cssValue;
final Resource resource = cssResourceValue.getValue();
return new ResourceContentToken( resource );
} else if ( cssValue instanceof CSSStringValue ) {
final CSSStringValue sval = (CSSStringValue) cssValue;
return new StaticTextToken( sval.getValue() );
} else {
return new StaticTextToken( cssValue.getCSSText() );
}
}
} else if ( value instanceof URL ) {
final CSSResourceValue cssResourceValue = FunctionUtilities.loadResource( layoutProcess, value );
final Resource resource = cssResourceValue.getValue();
return new ResourceContentToken( resource );
} else if ( value instanceof Resource ) {
return new ResourceContentToken( (Resource) value );
} else if ( value instanceof ResourceKey ) {
final CSSResourceValue cssResourceValue = FunctionUtilities.loadResource( layoutProcess, value );
final Resource resource = cssResourceValue.getValue();
return new ResourceContentToken( resource );
} else if ( value instanceof Date ) {
return new StaticTextToken( String.valueOf( value ) );
} else if ( value instanceof Number ) {
return new StaticTextToken( String.valueOf( value ) );
} else {
return new ExternalContentToken( value );
}
}
}