import com.sun.org.apache.xerces.internal.util.ErrorHandlerProxy; //导入依赖的package包/类
/**
 * @param validatorHandler may not be null.
 */
public JAXPValidatorComponent( ValidatorHandler validatorHandler ) {
    this.validator = validatorHandler;
    TypeInfoProvider tip = validatorHandler.getTypeInfoProvider();
    if(tip==null)   tip = noInfoProvider;
    this.typeInfoProvider = tip;

    // configure wiring between internal components.
    xni2sax.setContentHandler(validator);
    validator.setContentHandler(sax2xni);
    this.setSide(xni2sax);

    // configure validator with proper EntityResolver/ErrorHandler.
    validator.setErrorHandler(new ErrorHandlerProxy() {
        protected XMLErrorHandler getErrorHandler() {
            XMLErrorHandler handler = fErrorReporter.getErrorHandler();
            if(handler!=null)   return handler;
            return new ErrorHandlerWrapper(DraconianErrorHandler.getInstance());
        }
    });
    validator.setResourceResolver(new LSResourceResolver() {
        public LSInput resolveResource(String type,String ns, String publicId, String systemId, String baseUri) {
            if(fEntityResolver==null)   return null;
            try {
                XMLInputSource is = fEntityResolver.resolveEntity(
                    new XMLResourceIdentifierImpl(publicId,systemId,baseUri,null));
                if(is==null)    return null;

                LSInput di = new DOMInputImpl();
                di.setBaseURI(is.getBaseSystemId());
                di.setByteStream(is.getByteStream());
                di.setCharacterStream(is.getCharacterStream());
                di.setEncoding(is.getEncoding());
                di.setPublicId(is.getPublicId());
                di.setSystemId(is.getSystemId());

                return di;
            } catch( IOException e ) {
                // erors thrown by the callback is not supposed to be
                // reported to users.
                throw new XNIException(e);
            }
        }
    });
}