xmlscanner.java

java1.6众多例子参考

        } else if (NOTIFY_CHAR_REFS.equals(featureId)) {
            return fNotifyCharRefs;
        }
        throw new XMLConfigurationException(XMLConfigurationException.NOT_RECOGNIZED, featureId);
    }
    
    //
    // Protected methods
    //
    
    // anybody calling this had better have set Symtoltable!
    protected void reset() {
        init();

        // DTD preparsing defaults:
        fValidation = true;
        fNotifyCharRefs = false;

    }
    
    public void reset(PropertyManager propertyManager) {
        init();
        // Xerces properties
        fSymbolTable = (SymbolTable)propertyManager.getProperty(Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY);
        
        fErrorReporter = (XMLErrorReporter)propertyManager.getProperty(Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY);
        
        fEntityManager = (XMLEntityManager)propertyManager.getProperty(ENTITY_MANAGER);
        fEntityStore = fEntityManager.getEntityStore() ;
        fEntityScanner = (XMLEntityScanner)fEntityManager.getEntityScanner() ;
        //fEntityManager.reset();
        // DTD preparsing defaults:
        fValidation = false;
        fNotifyCharRefs = false;
        
    }
    // common scanning methods
    
    /**
     * Scans an XML or text declaration.
     * <p>
     * <pre>
     * [23] XMLDecl ::= '<?xml' VersionInfo EncodingDecl? SDDecl? S? '?>'
     * [24] VersionInfo ::= S 'version' Eq (' VersionNum ' | " VersionNum ")
     * [80] EncodingDecl ::= S 'encoding' Eq ('"' EncName '"' |  "'" EncName "'" )
     * [81] EncName ::= [A-Za-z] ([A-Za-z0-9._] | '-')*
     * [32] SDDecl ::= S 'standalone' Eq (("'" ('yes' | 'no') "'")
     *                 | ('"' ('yes' | 'no') '"'))
     *
     * [77] TextDecl ::= '<?xml' VersionInfo? EncodingDecl S? '?>'
     * </pre>
     *
     * @param scanningTextDecl True if a text declaration is to
     *                         be scanned instead of an XML
     *                         declaration.
     * @param pseudoAttributeValues An array of size 3 to return the version,
     *                         encoding and standalone pseudo attribute values
     *                         (in that order).
     *
     * <strong>Note:</strong> This method uses fString, anything in it
     * at the time of calling is lost.
     */
    protected void scanXMLDeclOrTextDecl(boolean scanningTextDecl,
            String[] pseudoAttributeValues)
            throws IOException, XNIException {
        
        // pseudo-attribute values
        String version = null;
        String encoding = null;
        String standalone = null;
        
        // scan pseudo-attributes
        final int STATE_VERSION = 0;
        final int STATE_ENCODING = 1;
        final int STATE_STANDALONE = 2;
        final int STATE_DONE = 3;
        int state = STATE_VERSION;
        
        boolean dataFoundForTarget = false;
        boolean sawSpace = fEntityScanner.skipSpaces();
        while (fEntityScanner.peekChar() != '?') {
            dataFoundForTarget = true;
            String name = scanPseudoAttribute(scanningTextDecl, fString);
            switch (state) {
                case STATE_VERSION: {
                    if (name.equals(fVersionSymbol)) {
                        if (!sawSpace) {
                            reportFatalError(scanningTextDecl
                                    ? "SpaceRequiredBeforeVersionInTextDecl"
                                    : "SpaceRequiredBeforeVersionInXMLDecl",
                                    null);
                        }
                        version = fString.toString();
                        state = STATE_ENCODING;
                        if (!versionSupported(version)) {
                            reportFatalError("VersionNotSupported",
                                    new Object[]{version});
                        }
                        
                        if (version.equals("1.1")) {
                            Entity.ScannedEntity top = fEntityManager.getTopLevelEntity();
                            if (top != null && (top.version == null || top.version.equals("1.0"))) {
                                reportFatalError("VersionMismatch", null);
                            }
                            fEntityManager.setScannerVersion(Constants.XML_VERSION_1_1);
                        }
                        
                    } else if (name.equals(fEncodingSymbol)) {
                        if (!scanningTextDecl) {
                            reportFatalError("VersionInfoRequired", null);
                        }
                        if (!sawSpace) {
                            reportFatalError(scanningTextDecl
                                    ? "SpaceRequiredBeforeEncodingInTextDecl"
                                    : "SpaceRequiredBeforeEncodingInXMLDecl",
                                    null);
                        }
                        encoding = fString.toString();
                        state = scanningTextDecl ? STATE_DONE : STATE_STANDALONE;
                    } else {
                        if (scanningTextDecl) {
                            reportFatalError("EncodingDeclRequired", null);
                        } else {
                            reportFatalError("VersionInfoRequired", null);
                        }
                    }
                    break;
                }
                case STATE_ENCODING: {
                    if (name.equals(fEncodingSymbol)) {
                        if (!sawSpace) {
                            reportFatalError(scanningTextDecl
                                    ? "SpaceRequiredBeforeEncodingInTextDecl"
                                    : "SpaceRequiredBeforeEncodingInXMLDecl",
                                    null);
                        }
                        encoding = fString.toString();
                        state = scanningTextDecl ? STATE_DONE : STATE_STANDALONE;
                        // TODO: check encoding name; set encoding on
                        //       entity scanner
                    } else if (!scanningTextDecl && name.equals(fStandaloneSymbol)) {
                        if (!sawSpace) {
                            reportFatalError("SpaceRequiredBeforeStandalone",
                                    null);
                        }
                        standalone = fString.toString();
                        state = STATE_DONE;
                        if (!standalone.equals("yes") && !standalone.equals("no")) {
                            reportFatalError("SDDeclInvalid", null);
                        }
                    } else {
                        reportFatalError("EncodingDeclRequired", null);
                    }
                    break;
                }
                case STATE_STANDALONE: {
                    if (name.equals(fStandaloneSymbol)) {
                        if (!sawSpace) {
                            reportFatalError("SpaceRequiredBeforeStandalone",
                                    null);
                        }
                        standalone = fString.toString();
                        state = STATE_DONE;
                        if (!standalone.equals("yes") && !standalone.equals("no")) {
                            reportFatalError("SDDeclInvalid", null);
                        }
                    } else {
                        reportFatalError("EncodingDeclRequired", null);
                    }
                    break;
                }
                default: {
                    reportFatalError("NoMorePseudoAttributes", null);
                }
            }
            sawSpace = fEntityScanner.skipSpaces();
        }
        // REVISIT: should we remove this error reporting?
        if (scanningTextDecl && state != STATE_DONE) {
            reportFatalError("MorePseudoAttributes", null);
        }
        
        // If there is no data in the xml or text decl then we fail to report error
        // for version or encoding info above.
        if (scanningTextDecl) {
            if (!dataFoundForTarget && encoding == null) {
                reportFatalError("EncodingDeclRequired", null);
            }
        } else {
            if (!dataFoundForTarget && version == null) {
                reportFatalError("VersionInfoRequired", null);
            }
        }
        
        // end
        if (!fEntityScanner.skipChar('?')) {
            reportFatalError("XMLDeclUnterminated", null);
        }
        if (!fEntityScanner.skipChar('>')) {
            reportFatalError("XMLDeclUnterminated", null);
            
        }
        
        // fill in return array
        pseudoAttributeValues[0] = version;
        pseudoAttributeValues[1] = encoding;
        pseudoAttributeValues[2] = standalone;
        
    } // scanXMLDeclOrTextDecl(boolean)
    
    /**
     * Scans a pseudo attribute.
     *
     * @param scanningTextDecl True if scanning this pseudo-attribute for a
     *                         TextDecl; false if scanning XMLDecl. This
     *                         flag is needed to report the correct type of
     *                         error.
     * @param value            The string to fill in with the attribute
     *                         value.
     *
     * @return The name of the attribute
     *
     * <strong>Note:</strong> This method uses fStringBuffer2, anything in it
     * at the time of calling is lost.
     */
    public String scanPseudoAttribute(boolean scanningTextDecl,
            XMLString value)
            throws IOException, XNIException {
        
        String name = fEntityScanner.scanName();
        // XMLEntityManager.print(fEntityManager.getCurrentEntity());
        
        if (name == null) {
            reportFatalError("PseudoAttrNameExpected", null);
        }
        fEntityScanner.skipSpaces();
        if (!fEntityScanner.skipChar('=')) {
            reportFatalError(scanningTextDecl ? "EqRequiredInTextDecl"
                    : "EqRequiredInXMLDecl", new Object[]{name});
        }
        fEntityScanner.skipSpaces();
        int quote = fEntityScanner.peekChar();
        if (quote != '\'' && quote != '"') {
            reportFatalError(scanningTextDecl ? "QuoteRequiredInTextDecl"
                    : "QuoteRequiredInXMLDecl" , new Object[]{name});
        }
        fEntityScanner.scanChar();
        int c = fEntityScanner.scanLiteral(quote, value);
        if (c != quote) {
            fStringBuffer2.clear();
            do {
                fStringBuffer2.append(value);
                if (c != -1) {
                    if (c == '&' || c == '%' || c == '<' || c == ']') {
                        fStringBuffer2.append((char)fEntityScanner.scanChar());
                    } else if (XMLChar.isHighSurrogate(c)) {
                        scanSurrogates(fStringBuffer2);
                    } else if (isInvalidLiteral(c)) {
                        String key = scanningTextDecl
                                ? "InvalidCharInTextDecl" : "InvalidCharInXMLDecl";
                        reportFatalError(key,
                                new Object[] {Integer.toString(c, 16)});
                                fEntityScanner.scanChar();
                    }
                }
                c = fEntityScanner.scanLiteral(quote, value);
            } while (c != quote);
            fStringBuffer2.append(value);
            value.setValues(fStringBuffer2);
        }
        if (!fEntityScanner.skipChar(quote)) {
            reportFatalError(scanningTextDecl ? "CloseQuoteMissingInTextDecl"
                    : "CloseQuoteMissingInXMLDecl",
                    new Object[]{name});
        }
        
        // return
        return name;
        
    } // scanPseudoAttribute(XMLString):String
    
    /**
     * Scans a processing instruction.
     * <p>
     * <pre>
     * [16] PI ::= '&lt;?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
     * [17] PITarget ::= Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))
     * </pre>
     */
    //CHANGED:
    //EARLIER: scanPI()
    //NOW: scanPI(XMLStringBuffer)
    //it makes things more easy if XMLStringBUffer is passed. Motivation for this change is same
    // as that for scanContent()
    
    protected void scanPI(XMLStringBuffer data) throws IOException, XNIException {
        
        // target
        fReportEntity = false;
        String target = fEntityScanner.scanName();
        if (target == null) {
            reportFatalError("PITargetRequired", null);
        }
        
        // scan data
        scanPIData(target, data);
        fReportEntity = true;
        
    } // scanPI(XMLStringBuffer)
    
    /**
     * Scans a processing data. This is needed to handle the situation
     * where a document starts with a processing instruction whose
     * target name <em>starts with</em> "xml". (e.g. xmlfoo)
     *
     * This method would always read the whole data. We have while loop and data is buffered
     * until delimeter is encountered.
     *
     * @param target The PI target
     * @param data The string to fill in with the data
     */
    
    //CHANGED:
    //Earlier:This method uses the fStringBuffer and later buffer values are set to
    //the supplied XMLString....
    //Now: Changed the signature of this function to pass XMLStringBuffer.. and data would
    //be appended to that buffer
    
    protected void scanPIData(String target, XMLStringBuffer data)
    throws IOException, XNIException {
        
        // check target
        if (target.length() == 3) {
            char c0 = Character.toLowerCase(target.charAt(0));
            char c1 = Character.toLowerCase(target.charAt(1));
            char c2 = Character.toLowerCase(target.charAt(2));
            if (c0 == 'x' && c1 == 'm' && c2 == 'l') {
                reportFatalError("ReservedPITarget", null);
            }
        }
        
        // spaces
        if (!fEntityScanner.skipSpaces()) {
            if (fEntityScanner.skipString("?>")) {
                // we found the end, there is no data just return
                return;
            } else {
                // if there is data there should be some space
                reportFatalError("SpaceRequiredInPI", null);
            }
        }
        
        // since scanData appends the parsed data to the buffer passed
        // a while loop would append the whole of parsed data to the buffer(data:XMLStringBuffer)
        //until all of the data is buffered.
        if (fEntityScanner.scanData("?>", data)) {
            do {
                int c = fEntityScanner.peekChar();
                if (c != -1) {
                    if (XMLChar.isHighSurrogate(c)) {
                        scanSurrogates(data);
                    } else if (isInvalidLiteral(c)) {
                        reportFatalError("InvalidCharInPI",