xml11nsdocumentscannerimpl.java

java1.6众多例子参考

                    fCurrentElement.rawname,
                    fAttributeQName.rawname });
        }
        fEntityScanner.skipSpaces();

        // content
        int attrIndex;

        if (fBindNamespaces) {
            attrIndex = attributes.getLength();
            attributes.addAttributeNS(
                fAttributeQName,
                XMLSymbols.fCDATASymbol,
                null);
        } else {
            int oldLen = attributes.getLength();
            attrIndex =
                attributes.addAttribute(
                    fAttributeQName,
                    XMLSymbols.fCDATASymbol,
                    null);

            // WFC: Unique Att Spec
            if (oldLen == attributes.getLength()) {
                reportFatalError(
                    "AttributeNotUnique",
                    new Object[] {
                        fCurrentElement.rawname,
                        fAttributeQName.rawname });
            }
        }

        //REVISIT: one more case needs to be included: external PE and standalone is no
        boolean isVC = fHasExternalDTD && !fStandalone;

        // REVISIT: it seems that this function should not take attributes, and length
        scanAttributeValue(
            this.fTempString,
            fTempString2,
            fAttributeQName.rawname,
            isVC,
            fCurrentElement.rawname);
        String value = fTempString.toString();
        attributes.setValue(attrIndex, value);
        attributes.setNonNormalizedValue(attrIndex, fTempString2.toString());
        attributes.setSpecified(attrIndex, true);

        // record namespace declarations if any.
        if (fBindNamespaces) {

            String localpart = fAttributeQName.localpart;
            String prefix =
                fAttributeQName.prefix != null
                    ? fAttributeQName.prefix
                    : XMLSymbols.EMPTY_STRING;
            // when it's of form xmlns="..." or xmlns:prefix="...",
            // it's a namespace declaration. but prefix:xmlns="..." isn't.
            if (prefix == XMLSymbols.PREFIX_XMLNS
                || prefix == XMLSymbols.EMPTY_STRING
                && localpart == XMLSymbols.PREFIX_XMLNS) {

                // get the internalized value of this attribute
                String uri = fSymbolTable.addSymbol(value);

                // 1. "xmlns" can't be bound to any namespace
                if (prefix == XMLSymbols.PREFIX_XMLNS
                    && localpart == XMLSymbols.PREFIX_XMLNS) {
                    fErrorReporter.reportError(
                        XMLMessageFormatter.XMLNS_DOMAIN,
                        "CantBindXMLNS",
                        new Object[] { fAttributeQName },
                        XMLErrorReporter.SEVERITY_FATAL_ERROR);
                }

                // 2. the namespace for "xmlns" can't be bound to any prefix
                if (uri == NamespaceContext.XMLNS_URI) {
                    fErrorReporter.reportError(
                        XMLMessageFormatter.XMLNS_DOMAIN,
                        "CantBindXMLNS",
                        new Object[] { fAttributeQName },
                        XMLErrorReporter.SEVERITY_FATAL_ERROR);
                }

                // 3. "xml" can't be bound to any other namespace than it's own
                if (localpart == XMLSymbols.PREFIX_XML) {
                    if (uri != NamespaceContext.XML_URI) {
                        fErrorReporter.reportError(
                            XMLMessageFormatter.XMLNS_DOMAIN,
                            "CantBindXML",
                            new Object[] { fAttributeQName },
                            XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    }
                }
                // 4. the namespace for "xml" can't be bound to any other prefix
                else {
                    if (uri == NamespaceContext.XML_URI) {
                        fErrorReporter.reportError(
                            XMLMessageFormatter.XMLNS_DOMAIN,
                            "CantBindXML",
                            new Object[] { fAttributeQName },
                            XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    }
                }

                prefix =
                    localpart != XMLSymbols.PREFIX_XMLNS
                        ? localpart
                        : XMLSymbols.EMPTY_STRING;

                // Declare prefix in context. Removing the association between a prefix and a 
                // namespace name is permitted in XML 1.1, so if the uri value is the empty string, 
                // the prefix is being unbound. -- mrglavas
                fNamespaceContext.declarePrefix(
                    prefix,
                    uri.length() != 0 ? uri : null);
                // bind namespace attribute to a namespace
                attributes.setURI(
                    attrIndex,
                    fNamespaceContext.getURI(XMLSymbols.PREFIX_XMLNS));

            } else {
                // attempt to bind attribute
                if (fAttributeQName.prefix != null) {
                    attributes.setURI(
                        attrIndex,
                        fNamespaceContext.getURI(fAttributeQName.prefix));
                }
            }
        }

        if (DEBUG_START_END_ELEMENT)
            System.out.println("<<< scanAttribute()");
    } // scanAttribute(XMLAttributes)

    /**
     * Scans an end element.
     * <p>
     * <pre>
     * [42] ETag ::= '&lt;/' Name S? '>'
     * </pre>
     * <p>
     * <strong>Note:</strong> This method uses the fElementQName variable.
     * The contents of this variable will be destroyed. The caller should
     * copy the needed information out of this variable before calling
     * this method.
     *
     * @return The element depth.
     */
    protected int scanEndElement() throws IOException, XNIException {
        if (DEBUG_START_END_ELEMENT)
            System.out.println(">>> scanEndElement()");

        // pop context
        QName endElementName = fElementStack.popElement();
                
        // Take advantage of the fact that next string _should_ be "fElementQName.rawName",
        //In scanners most of the time is consumed on checks done for XML characters, we can
        // optimize on it and avoid the checks done for endElement,
        //we will also avoid symbol table lookup - [e-mail]

        // this should work both for namespace processing true or false...

        //REVISIT: if the string is not the same as expected.. we need to do better error handling..
        //We can skip this for now... In any case if the string doesn't match -- document is not well formed.
        
        if (!fEntityScanner.skipString(endElementName.rawname)) {
             reportFatalError(
                "ETagRequired",
                new Object[] { endElementName.rawname });
        }

        // end
        fEntityScanner.skipSpaces();
        if (!fEntityScanner.skipChar('>')) {
            reportFatalError(
                "ETagUnterminated",
                new Object[] { endElementName.rawname });
        }
        fMarkupDepth--;

        //we have increased the depth for two markup "<" characters
        fMarkupDepth--;

        // check that this element was opened in the same entity
        if (fMarkupDepth < fEntityStack[fEntityDepth - 1]) {
            reportFatalError(
                "ElementEntityMismatch", 
                new Object[] { endElementName.rawname });
        }
        
        // call handler
        if (fDocumentHandler != null) {
            fDocumentHandler.endElement(endElementName, null);
           
            /*if (fBindNamespaces) {
                fNamespaceContext.popContext();
            }*/
            
        }
        
        if(dtdGrammarUtil != null)
            dtdGrammarUtil.endElement(endElementName);
        
        return fMarkupDepth;

    } // scanEndElement():int

    public void reset(XMLComponentManager componentManager)
        throws XMLConfigurationException {

        super.reset(componentManager);
        fPerformValidation = false;
        fBindNamespaces = false;
    }

    /** Creates a content Driver. */
    protected Driver createContentDriver() {
        return new NS11ContentDriver();
    } // createContentDriver():Driver

    
    /** return the next state on the input
     *
     * @return int
     */
    
    public int next() throws IOException, XNIException {
        //since namespace context should still be valid when the parser is at the end element state therefore
        //we pop the context only when next() has been called after the end element state was encountered. - nb.
        
        if((fScannerLastState == XMLEvent.END_ELEMENT) && fBindNamespaces){
            fScannerLastState = -1;
            fNamespaceContext.popContext();
        }
        
        return fScannerLastState = super.next();
    }
    
    
    /**
     * Driver to handle content scanning.
     */
    protected final class NS11ContentDriver extends ContentDriver {
        /**
         * Scan for root element hook. This method is a hook for
         * subclasses to add code that handles scanning for the root
         * element. This method will also attempt to remove DTD validator
         * from the pipeline, if there is no DTD grammar. If DTD validator
         * is no longer in the pipeline bind namespaces in the scanner.
         *
         *
         * @return True if the caller should stop and return true which
         *          allows the scanner to switch to a new scanning
         *          Driver. A return value of false indicates that
         *          the content Driver should continue as normal.
         */
        protected boolean scanRootElementHook()
            throws IOException, XNIException {
            
            if (fExternalSubsetResolver != null && !fSeenDoctypeDecl 
                && !fDisallowDoctype && (fValidation || fLoadExternalDTD)) {
                scanStartElementName();
                resolveExternalSubsetAndRead();
                reconfigurePipeline();
                if (scanStartElementAfterName()) {
                    setScannerState(SCANNER_STATE_TRAILING_MISC);
                    setDriver(fTrailingMiscDriver);
                    return true;
                }
            }
            else {
                reconfigurePipeline();
                if (scanStartElement()) {
                    setScannerState(SCANNER_STATE_TRAILING_MISC);
                    setDriver(fTrailingMiscDriver);
                    return true;
                }
            }
            return false;

        } // scanRootElementHook():boolean
        
        /**
         * Re-configures pipeline by removing the DTD validator 
         * if no DTD grammar exists. If no validator exists in the
         * pipeline or there is no DTD grammar, namespace binding
         * is performed by the scanner in the enclosing class.
         */
        private void reconfigurePipeline() {
            if (fDTDValidator == null) {
                fBindNamespaces = true;
            }
            else if (!fDTDValidator.hasGrammar()) {
                fBindNamespaces = true;
                fPerformValidation = fDTDValidator.validate();
                // re-configure pipeline
                XMLDocumentSource source = fDTDValidator.getDocumentSource();
                XMLDocumentHandler handler = fDTDValidator.getDocumentHandler();
                source.setDocumentHandler(handler);
                if (handler != null)
                    handler.setDocumentSource(source);
                fDTDValidator.setDocumentSource(null);
                fDTDValidator.setDocumentHandler(null);
            }
        } // reconfigurePipeline()
    }
}