import com.sun.xml.internal.ws.util.MetadataUtil; //导入依赖的package包/类
public ClientSchemaValidationTube(WSBinding binding, WSDLPort port, Tube next) {
    super(binding, next);
    this.port = port;
    if (port != null) {
        String primaryWsdl = port.getOwner().getParent().getLocation().getSystemId();
        MetadataResolverImpl mdresolver = new MetadataResolverImpl();
        Map<String, SDDocument> docs = MetadataUtil.getMetadataClosure(primaryWsdl, mdresolver, true);
        mdresolver = new MetadataResolverImpl(docs.values());
        Source[] sources = getSchemaSources(docs.values(), mdresolver);
        for(Source source : sources) {
            LOGGER.fine("Constructing client validation schema from = "+source.getSystemId());
            //printDOM((DOMSource)source);
        }
        if (sources.length != 0) {
            noValidation = false;
            sf.setResourceResolver(mdresolver);
            try {
                schema = sf.newSchema(sources);
            } catch(SAXException e) {
                throw new WebServiceException(e);
            }
            validator = schema.newValidator();
            return;
        }
    }
    noValidation = true;
    schema = null;
    validator = null;
}