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public class MyDataConnector extends BaseDataConnector {

	private String lookupUrl; //This is an example custom field, yours may vary (if any)

	public MyDataConnector(String url) {
		this.lookupUrl = url;
	}

	public Map<String, BaseAttribute> resolve(ShibbolethResolutionContext resolutionContext) 
				throws AttributeResolutionException {
		Map<String, BaseAttribute> result = new HashMap<String, BaseAttribute>();
		String username = resolutionContext.getAttributeRequestContext().getPrincipalName();
		// add BasicAttributes to the result here.
		return result;
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="urn:example.org:shibboleth:2.0:resolver" 
        xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:resolver="urn:mace:shibboleth:2.0:resolver" 
        elementFormDefault="qualified">

    <import namespace="urn:mace:shibboleth:2.0:resolver"
        schemaLocation="classpath:/schema/shibboleth-2.0-attribute-resolver.xsd" />

    <complexType name="UserLookup">
        <annotation>
            <documentation>
               Description of your data connector.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="resolver:BaseDataConnectorType">
                <attribute name="lookupUrl" type="string" use="required">
                    <annotation>
                        <documentation>
                            This is an example of a custom attribute called "lookupUrl". 
                            Look in the shib-common.jar at schema/shibboleth-2.0-attribute-resolver-dc.xml 
                            for more examples of how to define custom attributes and elements.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
</schema>

public class MyDataConnectorBeanDefinitionParser  extends BaseDataConnectorBeanDefinitionParser {

    public static final QName QNAME = new QName(MyDataConnectorNamespaceHandler.NAMESPACE, "UserLookup");

    protected Class getBeanClass(Element element) {
        return MyDataConnectorFactoryBean.class;
    }


    protected void doParse(Element element, BeanDefinitionBuilder builder) {
        super.doParse(element, builder);
        String lookupUrl = pluginConfig.getAttributeNS(null, "lookupUrl");
        builder.addPropertyValue("lookupUrl", lookupUrl);
    }
}

public class MyDataConnectorFactoryBean extends BaseDataConnectorFactoryBean {

    private String lookupUrl;

    public Class getObjectType() {
        return MyDataConnector.class;
    }

    protected Object createInstance() throws Exception {
    	MyDataConnector connector = new MyDataConnector(getLookupUrl());
        populateDataConnector(connector);
        return connector;
    }

    public void setLookupUrl(String url) { this.lookupUrl = url; }
    public String getLookupUrl() { return this.lookupUrl; }

}

public class MyDataConnectorNamespaceHandler extends BaseSpringNamespaceHandler {

    public static String NAMESPACE = "urn:example.org:shibboleth:2.0:resolver";

    public void init() {
        registerBeanDefinitionParser(MyDataConnectorBeanDefinitionParser.QNAME,
                                    new MyDataConnectorBeanDefinitionParser());
    }
}

urn\:example.org\:shibboleth\:2.0\:resolver = schema/myConnectors.xsd

urn\:example.org\:shibboleth\:2.0\:resolver =  com.example.shibboleth.MyDataConnectorNamespaceHandler