xmldocumentscannerimpl.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 1,359 行 · 第 1/4 页

         *
         * @return True if there is more to dispatch either from this
         *          or a another dispatcher.
         *
         * @throws IOException  Thrown on i/o error.
         * @throws XNIException Thrown on parse error.
         */
        public boolean dispatch(boolean complete)
            throws IOException, XNIException {

            // next dispatcher is prolog regardless of whether there
            // is an XMLDecl in this document
            setScannerState(SCANNER_STATE_PROLOG);
            setDispatcher(fPrologDispatcher);

            // scan XMLDecl
            try {
                if (fEntityScanner.skipString("<?xml")) {
                    fMarkupDepth++;
                    // NOTE: special case where document starts with a PI
                    //       whose name starts with "xml" (e.g. "xmlfoo")
                    if (XMLChar.isName(fEntityScanner.peekChar())) {
                        fStringBuffer.clear();
                        fStringBuffer.append("xml");
                        if (fNamespaces) {
                            while (XMLChar.isNCName(fEntityScanner.peekChar())) {
                                fStringBuffer.append((char)fEntityScanner.scanChar());
                            }
                        }
                        else {
                            while (XMLChar.isName(fEntityScanner.peekChar())) {
                                fStringBuffer.append((char)fEntityScanner.scanChar());
                            }
                        }
                        String target = fSymbolTable.addSymbol(fStringBuffer.ch, fStringBuffer.offset, fStringBuffer.length);
                        scanPIData(target, fString);
                    }

                    // standard XML declaration
                    else {
                        scanXMLDeclOrTextDecl(false);
                    }
                }
                fEntityManager.fCurrentEntity.mayReadChunks = true;

                // if no XMLDecl, then scan piece of prolog
                return true;
            }
            // encoding errors
            catch (MalformedByteSequenceException e) {
                fErrorReporter.reportError(e.getDomain(), e.getKey(), 
                    e.getArguments(), XMLErrorReporter.SEVERITY_FATAL_ERROR);
                return false;
            }
            catch (CharConversionException e) {
                reportFatalError("CharConversionFailure", null);
                return false;
            }
            // premature end of file
            catch (EOFException e) {
                reportFatalError("PrematureEOF", null);
                return false;
                //throw e;
            }


        } // dispatch(boolean):boolean

    } // class XMLDeclDispatcher

    /**
     * Dispatcher to handle prolog scanning.
     *
     * @author Andy Clark, IBM
     */
    protected final class PrologDispatcher
        implements Dispatcher {

        //
        // Dispatcher methods
        //

        /**
         * Dispatch an XML "event".
         *
         * @param complete True if this dispatcher is intended to scan
         *                 and dispatch as much as possible.
         *
         * @return True if there is more to dispatch either from this
         *          or a another dispatcher.
         *
         * @throws IOException  Thrown on i/o error.
         * @throws XNIException Thrown on parse error.
         */
        public boolean dispatch(boolean complete)
            throws IOException, XNIException {

            try {
                boolean again;
                do {
                    again = false;
                    switch (fScannerState) {
                        case SCANNER_STATE_PROLOG: {
                            fEntityScanner.skipSpaces();
                            if (fEntityScanner.skipChar('<')) {
                                setScannerState(SCANNER_STATE_START_OF_MARKUP);
                                again = true;
                            }
                            else if (fEntityScanner.skipChar('&')) {
                                setScannerState(SCANNER_STATE_REFERENCE);
                                again = true;
                            }
                            else {
                                setScannerState(SCANNER_STATE_CONTENT);
                                again = true;
                            }
                            break;
                        }
                        case SCANNER_STATE_START_OF_MARKUP: {
                            fMarkupDepth++;
                            if (fEntityScanner.skipChar('!')) {
                                if (fEntityScanner.skipChar('-')) {
                                    if (!fEntityScanner.skipChar('-')) {
                                        reportFatalError("InvalidCommentStart",
                                                         null);
                                    }
                                    setScannerState(SCANNER_STATE_COMMENT);
                                    again = true;
                                }
                                else if (fEntityScanner.skipString("DOCTYPE")) {
                                    setScannerState(SCANNER_STATE_DOCTYPE);
                                    again = true;
                                }
                                else {
                                    reportFatalError("MarkupNotRecognizedInProlog",
                                                     null);
                                }
                            }
                            else if (isValidNameStartChar(fEntityScanner.peekChar())) {
                                setScannerState(SCANNER_STATE_ROOT_ELEMENT);
                                setDispatcher(fContentDispatcher);
                                return true;
                            }
                            else if (fEntityScanner.skipChar('?')) {
                                setScannerState(SCANNER_STATE_PI);
                                again = true;
                            }
                            else if (isValidNameStartHighSurrogate(fEntityScanner.peekChar())) {
                                setScannerState(SCANNER_STATE_ROOT_ELEMENT);
                                setDispatcher(fContentDispatcher);
                                return true;
                            }
                            else {
                                reportFatalError("MarkupNotRecognizedInProlog",
                                                 null);
                            }
                            break;
                        }
                        case SCANNER_STATE_COMMENT: {
                            scanComment();
                            setScannerState(SCANNER_STATE_PROLOG);
                            break;
                        }
                        case SCANNER_STATE_PI: {
                            scanPI();
                            setScannerState(SCANNER_STATE_PROLOG);
                            break;
                        }
                        case SCANNER_STATE_DOCTYPE: {
                            if (fDisallowDoctype) {
                                reportFatalError("DoctypeNotAllowed", null);
                            }
                            if (fSeenDoctypeDecl) {
                                reportFatalError("AlreadySeenDoctype", null);
                            }
                            fSeenDoctypeDecl = true;

                            // scanDoctypeDecl() sends XNI doctypeDecl event that 
                            // in SAX is converted to startDTD() event.
                            if (scanDoctypeDecl()) {
                                setScannerState(SCANNER_STATE_DTD_INTERNAL_DECLS);
                                setDispatcher(fDTDDispatcher);
                                return true;
                            }
                            
                            // handle external subset
                            if (fDoctypeSystemId != null) {
                                if (((fValidation || fLoadExternalDTD) 
                                    && (fValidationManager == null || !fValidationManager.isCachedDTD()))) {
                                    setScannerState(SCANNER_STATE_DTD_EXTERNAL);
                                    setDispatcher(fDTDDispatcher);
                                    return true;
                                }
                            }
                            else if (fExternalSubsetSource != null) {
                                if (((fValidation || fLoadExternalDTD) 
                                    && (fValidationManager == null || !fValidationManager.isCachedDTD()))) {
                                    // This handles the case of a DOCTYPE that had neither an internal subset or an external subset.
                                    fDTDScanner.setInputSource(fExternalSubsetSource);
                                    fExternalSubsetSource = null;
                                    setScannerState(SCANNER_STATE_DTD_EXTERNAL_DECLS);
                                    setDispatcher(fDTDDispatcher);
                                    return true;
                                }                       	
                            }
                            
                            // Send endDTD() call if: 
                            // a) systemId is null or if an external subset resolver could not locate an external subset.
                            // b) "load-external-dtd" and validation are false
                            // c) DTD grammar is cached
                                
                            // in XNI this results in 3 events:  doctypeDecl, startDTD, endDTD
                            // in SAX this results in 2 events: startDTD, endDTD
                            fDTDScanner.setInputSource(null);
                            setScannerState(SCANNER_STATE_PROLOG);
                            break;
                        }
                        case SCANNER_STATE_CONTENT: {
                            reportFatalError("ContentIllegalInProlog", null);
                            fEntityScanner.scanChar();
                        }
                        case SCANNER_STATE_REFERENCE: {
                            reportFatalError("ReferenceIllegalInProlog", null);
                        }
                    }
                } while (complete || again);

                if (complete) {
                    if (fEntityScanner.scanChar() != '<') {
                        reportFatalError("RootElementRequired", null);
                    }
                    setScannerState(SCANNER_STATE_ROOT_ELEMENT);
                    setDispatcher(fContentDispatcher);
                }
            }
            // encoding errors
            catch (MalformedByteSequenceException e) {
                fErrorReporter.reportError(e.getDomain(), e.getKey(), 
                    e.getArguments(), XMLErrorReporter.SEVERITY_FATAL_ERROR);
                return false;
            }
            catch (CharConversionException e) {
                reportFatalError("CharConversionFailure", null);
                return false;
            }
            // premature end of file
            catch (EOFException e) {
                reportFatalError("PrematureEOF", null);
                return false;
                //throw e;
            }

            return true;

        } // dispatch(boolean):boolean

    } // class PrologDispatcher

    /**
     * Dispatcher to handle the internal and external DTD subsets.
     *
     * @author Andy Clark, IBM
     */
    protected final class DTDDispatcher
        implements Dispatcher {

        //
        // Dispatcher methods
        //

        /**
         * Dispatch an XML "event".
         *
         * @param complete True if this dispatcher is intended to scan
         *                 and dispatch as much as possible.
         *
         * @return True if there is more to dispatch either from this
         *          or a another dispatcher.
         *
         * @throws IOException  Thrown on i/o error.
         * @throws XNIException Thrown on parse error.
         */
        public boolean dispatch(boolean complete)
            throws IOException, XNIException {
            fEntityManager.setEntityHandler(null);
            try {
                boolean again;
                XMLEntityDescriptionImpl entityDescription = new XMLEntityDescriptionImpl();
                do {
                    again = false;
                    switch (fScannerState) {
                        case SCANNER_STATE_DTD_INTERNAL_DECLS: {
                            // REVISIT: Should there be a feature for
                            //          the "complete" parameter?
                            boolean completeDTD = true;

                            boolean moreToScan = fDTDScanner.scanDTDInternalSubset(completeDTD, fStandalone, fHasExternalDTD && fLoadExternalDTD);
                            if (!moreToScan) {
                                // end doctype declaration
                                if (!fEntityScanner.skipChar(']')) {
                                    reportFatalError("EXPECTED_SQUARE_BRACKET_TO_CLOSE_INTERNAL_SUBSET",
                                                     null);
                                }
                                fEntityScanner.skipSpaces();
                                if (!fEntityScanner.skipChar('>')) {
                                    reportFatalError("DoctypedeclUnterminated", new Object[]{fDoctypeName});
                                }
                                fMarkupDepth--;

                                // scan external subset next
                                if (fDoctypeSystemId != null) {
                                    if ((fValidation || fLoadExternalDTD) 
                                        && (fValidationManager == null || !fValidationManager.isCachedDTD())) {
                                        setScannerState(SCANNER_STATE_DTD_EXTERNAL);
                                        break;
                                    }
                                }
                                else if (fExternalSubsetSource != null) {
                                    if ((fValidation || fLoadExternalDTD) 
                                        && (fValidationManager == null || !fValidationManager.isCachedDTD())) {
                                        // This handles the case of a DOCTYPE that only had an internal subset.
                                        fDTDScanner.setInputSource(fExternalSubsetSource);
                                        fExternalSubsetSource = null;
                                        setScannerState(SCANNER_STATE_DTD_EXTERNAL_DECLS);
                                        break;
                                    }
                                }
                                
                                // break out of this dispatcher.
                                setScannerState(SCANNER_STATE_PROLOG);
                                setDispatcher(fPrologDispatcher);
                                fEntityManager.setEntityHandler(XMLDocumentScannerImpl.this);
                                return true;
                            }
                            break;
                        }
                        case SCANNER_STATE_DTD_EXTERNAL: {
                            entityDescription.setDescription("[dtd]", fDoctypePublicId, fDoctypeSystemId, null, null);
                            XMLInputSource xmlInputSource =
                                fEntityManager.resolveEntity(entityDescription);