xmlnsdocumentscannerimpl.java

java1.6众多例子参考

                    fAttributeQName.uri = uri;
                    if (uri == null) {
                        fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                "AttributePrefixUnbound",
                                new Object[]{fElementQName.rawname,fAttributeQName.rawname,aprefix},
                                XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    }
                    fAttributes.setURI(i, uri);
                    // checkDuplicates(fAttributeQName, fAttributes);
                }
            }
            
            if (length > 1) {
                QName name = fAttributes.checkDuplicatesNS();
                if (name != null) {
                    if (name.uri != null) {
                        fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                "AttributeNSNotUnique",
                                new Object[]{fElementQName.rawname, name.localpart, name.uri},
                                XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    } else {
                        fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                "AttributeNotUnique",
                                new Object[]{fElementQName.rawname, name.rawname},
                                XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    }
                }
            }
        }
        
        
        if (fEmptyElement) {
            //decrease the markup depth..
            fMarkupDepth--;
            
            // check that this element was opened in the same entity
            if (fMarkupDepth < fEntityStack[fEntityDepth - 1]) {
                reportFatalError("ElementEntityMismatch",
                        new Object[]{fCurrentElement.rawname});
            }
            // call handler
            if (fDocumentHandler != null) {
                if(DEBUG)
                    System.out.println("emptyElement = " + fElementQName);
                
                fDocumentHandler.emptyElement(fElementQName, fAttributes, null);
            }
            
            //We should not be popping out the context here in endELement becaause the namespace context is still
            //valid when parser is at the endElement state.
            fScanEndElement = true;
            //if (fBindNamespaces) {
            //  fNamespaceContext.popContext();
            //}
            
            //pop the element off the stack..
            fElementStack.popElement();
            
        } else {
            
            if(dtdGrammarUtil != null)
                dtdGrammarUtil.startElement(fElementQName,fAttributes); 
            if(fDocumentHandler != null){
                //complete element and attributes are traversed in this function so we can send a callback
                //here.
                //<strong>we shouldn't be sending callback in scanDocument()</strong>                
                if(DEBUG)
                    System.out.println("startElement = " + fElementQName);
                fDocumentHandler.startElement(fElementQName, fAttributes, null);
            }
        }
        
        
        if (DEBUG_START_END_ELEMENT) System.out.println(this.getClass().toString() +"<<< scanStartElement(): "+fEmptyElement);
        return fEmptyElement;
        
    } // scanStartElement():boolean

    
        
    /**
     * Scans an attribute.
     * <p>
     * <pre>
     * [41] Attribute ::= Name Eq AttValue
     * </pre>
     * <p>
     * <strong>Note:</strong> This method assumes that the next
     * character on the stream is the first character of the attribute
     * name.
     * <p>
     * <strong>Note:</strong> This method uses the fAttributeQName and
     * fQName variables. The contents of these variables will be
     * destroyed.
     *
     * @param attributes The attributes list for the scanned attribute.
     */
    protected void scanAttribute(XMLAttributesImpl attributes)
    throws IOException, XNIException {
        if (DEBUG_START_END_ELEMENT) System.out.println(this.getClass().toString() +">>> scanAttribute()");
        
        // name
        fEntityScanner.scanQName(fAttributeQName);
        
        // equals
        fEntityScanner.skipSpaces();
        if (!fEntityScanner.skipChar('=')) {
            reportFatalError("EqRequiredInAttribute",
                    new Object[]{fCurrentElement.rawname,fAttributeQName.rawname});
        }
        fEntityScanner.skipSpaces();
        
        // content
        int attrIndex = 0 ;
        
        
        //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
        //fTempString would store attribute value
        ///fTempString2 would store attribute non-normalized value
        
        //this function doesn't use 'attIndex'. We are adding the attribute later
        //after we have figured out that current attribute is not namespace declaration
        //since scanAttributeValue doesn't use attIndex parameter therefore we
        //can safely add the attribute later..
        XMLString tmpStr = getString();
        scanAttributeValue(tmpStr, fTempString2,
                fAttributeQName.rawname, attributes,
                attrIndex, isVC);
        
        String value = null;
        //fTempString.toString();
        
        // 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(tmpStr.ch,tmpStr.offset,tmpStr.length);
                value = uri;
                // 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;
                //set it equal to XMLSymbols.PREFIX_XMLNS when namespace declaration
                // is of type xmlns = "..", in this case prefix = "" and localname = XMLSymbols.PREFIX_XMLNS
                //this special behavior is because of dependency on this behavior in DOM components
                if(prefix == XMLSymbols.EMPTY_STRING && localpart == XMLSymbols.PREFIX_XMLNS){
                    fAttributeQName.prefix = XMLSymbols.PREFIX_XMLNS;
                }
                // http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-prefix
                // We should only report an error if there is a prefix,
                // that is, the local part is not "xmlns". -SG
                if (uri == XMLSymbols.EMPTY_STRING && localpart != XMLSymbols.PREFIX_XMLNS) {
                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                            "EmptyPrefixedAttName",
                            new Object[]{fAttributeQName},
                            XMLErrorReporter.SEVERITY_FATAL_ERROR);
                }
                                
                // check for duplicate prefix bindings
                if (((com.sun.org.apache.xerces.internal.util.NamespaceSupport) fNamespaceContext).containsPrefixInCurrentContext(prefix)) {
                    reportFatalError("AttributeNotUnique",
                            new Object[]{fCurrentElement.rawname,
                            fAttributeQName.rawname});
                }

                // declare prefix in context
                boolean declared = fNamespaceContext.declarePrefix(prefix, uri.length() != 0 ? uri : null);
                
                // check for duplicate xmlns declarations
                if (!declared) { // by convention, prefix == "xmlns" | "xml"
                    // error if duplicate declaration
                    if (fXmlnsDeclared) {
                        reportFatalError("AttributeNotUnique",
                                new Object[]{fCurrentElement.rawname,
                                fAttributeQName.rawname});
                    }
                    
                    // xmlns declared
                    fXmlnsDeclared = true;
                }
        
                //xerces internals (XSAttributeChecker) has dependency on namespace declaration returned
                //as part of XMLAttributes.
                //addition of namespace declaration to the attribute list is controlled by fNotAddNSDeclAsAttribute
                //feature. This is required in Stax where namespace declarations are not considered as attribute

                if(fNotAddNSDeclAsAttribute){
                    return ;
                }
            }                
        }
        
        //add the attributes to the list of attributes
        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});
            }
        }
        
        attributes.setValue(attrIndex, value,tmpStr);
        //attributes.setNonNormalizedValue(attrIndex, fTempString2.toString());
        //removing  as we are not using non-normalized values . -Venu
        attributes.setSpecified(attrIndex, true);
        
        // attempt to bind attribute
        if (fAttributeQName.prefix != null) {
            attributes.setURI(attrIndex, fNamespaceContext.getURI(fAttributeQName.prefix));
        }
        
        if (DEBUG_START_END_ELEMENT) System.out.println(this.getClass().toString() +"<<< scanAttribute()");
    } // scanAttribute(XMLAttributes)
    
        
    
    
    
    /** Creates a content driver. */
    protected Driver createContentDriver() {
        return new NSContentDriver();
    } // createContentDriver():Driver
    
    /**
     * Driver to handle content scanning.
     */
    protected final class NSContentDriver
            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 {
            
            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() {
            //fDTDValidator will be null in Stax mode
            if (fNamespaces && fDTDValidator == null) {
                fBindNamespaces = true;
            }
            else if (fNamespaces && !fDTDValidator.hasGrammar() ) {
                fBindNamespaces = true;
                fPerformValidation = fDTDValidator.validate();
                // re-configure pipeline by removing DTDValidator
                XMLDocumentSource source = fDTDValidator.getDocumentSource();
                XMLDocumentHandler handler = fDTDValidator.getDocumentHandler();
                source.setDocumentHandler(handler);
                if (handler != null)
                    handler.setDocumentSource(source);
                fDTDValidator.setDocumentSource(null);
                fDTDValidator.setDocumentHandler(null);
            }
        } // reconfigurePipeline()        
    }
        
} // class XMLNSDocumentScannerImpl