/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.sld.bindings;
import java.util.Iterator;
import javax.xml.namespace.QName;
import org.geotools.xml.AbstractComplexBinding;
import org.geotools.xml.ElementInstance;
import org.geotools.xml.Node;
import org.opengis.filter.FilterFactory;
import org.opengis.filter.expression.Expression;
import org.picocontainer.MutablePicoContainer;
/**
* Binding object for the type http://www.opengis.net/sld:ParameterValueType.
*
* <p>
* <pre>
* <code>
* <xsd:complexType name="ParameterValueType" mixed="true">
* <xsd:annotation>
* <xsd:documentation> The "ParameterValueType"
* uses WFS-Filter expressions to give values for SLD
* graphic parameters. A "mixed" element-content
* model is used with textual substitution for values. </xsd:documentation>
* </xsd:annotation>
* <xsd:sequence minOccurs="0" maxOccurs="unbounded">
* <xsd:element ref="ogc:expression"/>
* </xsd:sequence>
* </xsd:complexType>
*
* </code>
* </pre>
* </p>
*
* @generated
*
* @source $URL$
*/
public class SLDParameterValueTypeBinding extends AbstractComplexBinding {
FilterFactory filterFactory;
public SLDParameterValueTypeBinding(FilterFactory filterFactory) {
this.filterFactory = filterFactory;
}
/**
* @generated
*/
public QName getTarget() {
return SLD.PARAMETERVALUETYPE;
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
*
* @generated modifiable
*/
public int getExecutionMode() {
return OVERRIDE;
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
*
* @generated modifiable
*/
public Class getType() {
return Expression.class;
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
*
* @generated modifiable
*/
public void initialize(ElementInstance instance, Node node, MutablePicoContainer context) {
}
/**
* <!-- begin-user-doc -->
* Even though the spec allows an instance of ParamterValueType to have
* multiple expressions as children, it is more often that there is only
* one. Therefore this binding returns the first expression it finds or
* null. If a subtype needs multiple expressions they should ovveride.
* <!-- end-user-doc -->
*
* @generated modifiable
*/
public Object parse(ElementInstance instance, Node node, Object value)
throws Exception {
//first look for an expresion in the child text
String text = instance.getText();
if ((text != null) && !"".equals(text)) {
return filterFactory.literal(text);
}
for (Iterator itr = node.getChildren().iterator(); itr.hasNext();) {
Node child = (Node) itr.next();
if (child.getValue() instanceof Expression) {
return child.getValue();
}
}
return null;
}
}