Xerces2 Implementation: Class XMLScanner

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## org.apache.xerces.impl
Class XMLScanner

    java.lang.Object
      |
      +--org.apache.xerces.impl.XMLScanner

All Implemented Interfaces:
  org.apache.xerces.xni.parser.XMLComponent

Direct Known Subclasses:
  XMLDocumentFragmentScannerImpl, XMLDTDScannerImpl

public abstract class XMLScanner
extends java.lang.Object
implements org.apache.xerces.xni.parser.XMLComponent

This class is responsible for holding scanning methods common to scanning the XML document structure and content as well as the DTD structure and content. Both XMLDocumentScanner and XMLDTDScanner inherit from this base class.

This component requires the following features and properties from the component manager that uses it:

- http://xml.org/sax/features/validation
- http://xml.org/sax/features/namespaces
- http://apache.org/xml/features/scanner/notify-char-refs
- http://apache.org/xml/properties/internal/symbol-table
- http://apache.org/xml/properties/internal/error-reporter
- http://apache.org/xml/properties/internal/entity-manager

# INTERNAL:

  Usage of this class is not supported. It may be altered or removed at any time.

Version:
  $Id: XMLScanner.java 572055 2007-09-02 17:55:43Z mrglavas $
Author:
  Andy Clark, IBM, Arnaud Le Hors, IBM, Eric Ye, IBM

Field Summary
`protected static boolean` | `DEBUG_ATTR_NORMALIZATION` Debug attribute normalization.
`protected static java.lang.String` | `ENTITY_MANAGER` Property identifier: entity manager.
`protected static java.lang.String` | `ERROR_REPORTER` Property identifier: error reporter.
`protected static java.lang.String` | `fAmpSymbol` Symbol: "amp".
`protected static java.lang.String` | `fAposSymbol` Symbol: "apos".
`protected java.lang.String` | `fCharRefLiteral` Literal value of the last character refence scanned.
`protected static java.lang.String` | `fEncodingSymbol` Symbol: "encoding".
`protected int` | `fEntityDepth` Entity depth.
`protected XMLEntityManager` | `fEntityManager` Entity manager.
`protected XMLEntityScanner` | `fEntityScanner` Entity scanner.
`protected XMLErrorReporter` | `fErrorReporter` Error reporter.
`protected static java.lang.String` | `fGtSymbol` Symbol: "gt".
`protected static java.lang.String` | `fLtSymbol` Symbol: "lt".
`protected boolean` | `fNamespaces` Namespaces.
`protected boolean` | `fNotifyCharRefs` Character references notification.
`protected boolean` | `fParserSettings` Internal parser-settings feature
`protected static java.lang.String` | `fQuotSymbol` Symbol: "quot".
`protected boolean` | `fReportEntity` Report entity boundary.
`protected XMLResourceIdentifierImpl` | `fResourceIdentifier`
`protected boolean` | `fScanningAttribute` Scanning attribute.
`protected static java.lang.String` | `fStandaloneSymbol` Symbol: "standalone".
`protected SymbolTable` | `fSymbolTable` Symbol table.
`protected boolean` | `fValidation` Validation.
`protected static java.lang.String` | `fVersionSymbol` Symbol: "version".
`protected static java.lang.String` | `NAMESPACES` Feature identifier: namespaces.
`protected static java.lang.String` | `NOTIFY_CHAR_REFS` Feature identifier: notify character references.
`protected static java.lang.String` | `PARSER_SETTINGS`
`protected static java.lang.String` | `SYMBOL_TABLE` Property identifier: symbol table.
`protected static java.lang.String` | `VALIDATION` Feature identifier: validation.

Constructor Summary
`XMLScanner()`

Method Summary
`void` | `endEntity(java.lang.String name, org.apache.xerces.xni.Augmentations augs)` This method notifies the end of an entity.
`boolean` | `getFeature(java.lang.String featureId)`
`protected java.lang.String` | `getVersionNotSupportedKey()`
`protected boolean` | `isInvalid(int value)`
`protected boolean` | `isInvalidLiteral(int value)`
`protected int` | `isUnchangedByNormalization(org.apache.xerces.xni.XMLString value)` Checks whether this string would be unchanged by normalization.
`protected boolean` | `isValidNameChar(int value)`
`protected boolean` | `isValidNameStartChar(int value)`
`protected boolean` | `isValidNameStartHighSurrogate(int value)`
`protected boolean` | `isValidNCName(int value)`
`protected void` | `normalizeWhitespace(org.apache.xerces.xni.XMLString value)` Normalize whitespace in an XMLString converting all whitespace characters to space characters.
`protected void` | `normalizeWhitespace(org.apache.xerces.xni.XMLString value, int fromIndex)` Normalize whitespace in an XMLString converting all whitespace characters to space characters.
`protected void` | `reportFatalError(java.lang.String msgId, java.lang.Object[] args)` Convenience function used in all XML scanners.
`protected void` | `reset()`
`void` | `reset(org.apache.xerces.xni.parser.XMLComponentManager componentManager)` Resets the component.
`protected boolean` | `scanAttributeValue(org.apache.xerces.xni.XMLString value, org.apache.xerces.xni.XMLString nonNormalizedValue, java.lang.String atName, boolean checkEntities, java.lang.String eleName)` Scans an attribute value and normalizes whitespace converting all whitespace characters to space characters.
`protected int` | `scanCharReferenceValue(XMLStringBuffer buf, XMLStringBuffer buf2)` Scans a character reference and append the corresponding chars to the specified buffer.
`protected void` | `scanComment(XMLStringBuffer text)` Scans a comment.
`protected void` | `scanExternalID(java.lang.String[] identifiers, boolean optionalSystemId)` Scans External ID and return the public and system IDs.
`protected void` | `scanPI()` Scans a processing instruction.
`protected void` | `scanPIData(java.lang.String target, org.apache.xerces.xni.XMLString data)` Scans a processing data.
`java.lang.String` | `scanPseudoAttribute(boolean scanningTextDecl, org.apache.xerces.xni.XMLString value)` Scans a pseudo attribute.
`protected boolean` | `scanPubidLiteral(org.apache.xerces.xni.XMLString literal)` Scans public ID literal.
`protected boolean` | `scanSurrogates(XMLStringBuffer buf)` Scans surrogates and append them to the specified buffer.
`protected void` | `scanXMLDeclOrTextDecl(boolean scanningTextDecl, java.lang.String[] pseudoAttributeValues)` Scans an XML or text declaration.
`void` | `setFeature(java.lang.String featureId, boolean value)` Sets the state of a feature.
`void` | `setProperty(java.lang.String propertyId, java.lang.Object value)` Sets the value of a property during parsing.
`void` | `startEntity(java.lang.String name, org.apache.xerces.xni.XMLResourceIdentifier identifier, java.lang.String encoding, org.apache.xerces.xni.Augmentations augs)` This method notifies of the start of an entity.
`protected boolean` | `versionSupported(java.lang.String version)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.apache.xerces.xni.parser.XMLComponent
`getFeatureDefault, getPropertyDefault, getRecognizedFeatures, getRecognizedProperties`

Field Detail

### VALIDATION

    protected static final java.lang.String VALIDATION

  Feature identifier: validation.

### NAMESPACES

    protected static final java.lang.String NAMESPACES

  Feature identifier: namespaces.

### NOTIFY_CHAR_REFS

    protected static final java.lang.String NOTIFY_CHAR_REFS

  Feature identifier: notify character references.

### PARSER_SETTINGS

    protected static final java.lang.String PARSER_SETTINGS

### SYMBOL_TABLE

    protected static final java.lang.String SYMBOL_TABLE

  Property identifier: symbol table.

### ERROR_REPORTER

    protected static final java.lang.String ERROR_REPORTER

  Property identifier: error reporter.

### ENTITY_MANAGER

    protected static final java.lang.String ENTITY_MANAGER

  Property identifier: entity manager.

### DEBUG_ATTR_NORMALIZATION

    protected static final boolean DEBUG_ATTR_NORMALIZATION

  Debug attribute normalization.

### fValidation

    protected boolean fValidation

  Validation. This feature identifier is: http://xml.org/sax/features/validation

### fNamespaces

    protected boolean fNamespaces

  Namespaces.

### fNotifyCharRefs

    protected boolean fNotifyCharRefs

  Character references notification.

### fParserSettings

    protected boolean fParserSettings

  Internal parser-settings feature

### fSymbolTable

    protected SymbolTable fSymbolTable

  Symbol table.

### fErrorReporter

    protected XMLErrorReporter fErrorReporter

  Error reporter.

### fEntityManager

    protected XMLEntityManager fEntityManager

  Entity manager.

### fEntityScanner

    protected XMLEntityScanner fEntityScanner

  Entity scanner.

### fEntityDepth

    protected int fEntityDepth

  Entity depth.

### fCharRefLiteral

    protected java.lang.String fCharRefLiteral

  Literal value of the last character refence scanned.

### fScanningAttribute

    protected boolean fScanningAttribute

  Scanning attribute.

### fReportEntity

    protected boolean fReportEntity

  Report entity boundary.

### fVersionSymbol

    protected static final java.lang.String fVersionSymbol

  Symbol: "version".

### fEncodingSymbol

    protected static final java.lang.String fEncodingSymbol

  Symbol: "encoding".

### fStandaloneSymbol

    protected static final java.lang.String fStandaloneSymbol

  Symbol: "standalone".

### fAmpSymbol

    protected static final java.lang.String fAmpSymbol

  Symbol: "amp".

### fLtSymbol

    protected static final java.lang.String fLtSymbol

  Symbol: "lt".

### fGtSymbol

    protected static final java.lang.String fGtSymbol

  Symbol: "gt".

### fQuotSymbol

    protected static final java.lang.String fQuotSymbol

  Symbol: "quot".

### fAposSymbol

    protected static final java.lang.String fAposSymbol

  Symbol: "apos".

### fResourceIdentifier

    protected final XMLResourceIdentifierImpl fResourceIdentifier

Constructor Detail

### XMLScanner

    public XMLScanner()

Method Detail

### reset

    public void reset(org.apache.xerces.xni.parser.XMLComponentManager componentManager)
               throws org.apache.xerces.xni.parser.XMLConfigurationException

  Description copied from interface: `org.apache.xerces.xni.parser.XMLComponent`
  Resets the component. The component can query the component manager about any features and properties that affect the operation of the component.
  Specified by:
    `reset` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Parameters:
    `componentManager` - The component manager.
  Throws:
    `SAXException` - Throws exception if required features and properties cannot be found.

### setProperty

    public void setProperty(java.lang.String propertyId,
                            java.lang.Object value)
                     throws org.apache.xerces.xni.parser.XMLConfigurationException

  Sets the value of a property during parsing.
  Specified by:
    `setProperty` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Parameters:
    `propertyId` -
    `value` -

### setFeature

    public void setFeature(java.lang.String featureId,
                           boolean value)
                    throws org.apache.xerces.xni.parser.XMLConfigurationException

  Description copied from interface: `org.apache.xerces.xni.parser.XMLComponent`
  Sets the state of a feature. This method is called by the component manager any time after reset when a feature changes state.

  Note: Components should silently ignore features that do not affect the operation of the component.

  Specified by:
    `setFeature` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Following copied from interface: `org.apache.xerces.xni.parser.XMLComponent`
  Parameters:
    `featureId` - The feature identifier.
    `state` - The state of the feature.
  Throws:
    `org.apache.xerces.xni.parser.XMLConfigurationException` - Thrown for configuration error. In general, components should only throw this exception if it is really a critical error.

### getFeature

    public boolean getFeature(java.lang.String featureId)
                       throws org.apache.xerces.xni.parser.XMLConfigurationException

### reset

    protected void reset()

### scanXMLDeclOrTextDecl

    protected void scanXMLDeclOrTextDecl(boolean scanningTextDecl,
                                         java.lang.String[] pseudoAttributeValues)
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Scans an XML or text declaration.

       [23] XMLDecl ::= ''
       [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 ::= ''

  Parameters:
    `scanningTextDecl` - True if a text declaration is to be scanned instead of an XML declaration.
    `pseudoAttributeValues` - An array of size 3 to return the version, encoding and standalone pseudo attribute values (in that order). Note: This method uses fString, anything in it at the time of calling is lost.

### scanPseudoAttribute

    public java.lang.String scanPseudoAttribute(boolean scanningTextDecl,
                                                org.apache.xerces.xni.XMLString value)
                                         throws java.io.IOException,
                                                org.apache.xerces.xni.XNIException

  Scans a pseudo attribute.
  Parameters:
    `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.
    `value` - The string to fill in with the attribute value.
  Returns:
    The name of the attribute Note: This method uses fStringBuffer2, anything in it at the time of calling is lost.

### scanPI

    protected void scanPI()
                   throws java.io.IOException,
                          org.apache.xerces.xni.XNIException

  Scans a processing instruction.

       [16] PI ::= '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
       [17] PITarget ::= Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))

  Note: This method uses fString, anything in it at the time of calling is lost.

### scanPIData

    protected void scanPIData(java.lang.String target,
                              org.apache.xerces.xni.XMLString data)
                       throws java.io.IOException,
                              org.apache.xerces.xni.XNIException

  Scans a processing data. This is needed to handle the situation where a document starts with a processing instruction whose target name starts with "xml". (e.g. xmlfoo) Note: This method uses fStringBuffer, anything in it at the time of calling is lost.
  Parameters:
    `target` - The PI target
    `data` - The string to fill in with the data

### scanComment

    protected void scanComment(XMLStringBuffer text)
                        throws java.io.IOException,
                               org.apache.xerces.xni.XNIException

  Scans a comment.

       [15] Comment ::= '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'

  Note: Called after scanning past '<!--' Note: This method uses fString, anything in it at the time of calling is lost.

  Parameters:
    `text` - The buffer to fill in with the text.

### scanAttributeValue

    protected boolean scanAttributeValue(org.apache.xerces.xni.XMLString value,
                                         org.apache.xerces.xni.XMLString nonNormalizedValue,
                                         java.lang.String atName,
                                         boolean checkEntities,
                                         java.lang.String eleName)
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Scans an attribute value and normalizes whitespace converting all whitespace characters to space characters. [10] AttValue ::= '"' ([^<&"] | Reference)* '"' | "'" ([^<&'] | Reference)* "'"
  Parameters:
    `value` - The XMLString to fill in with the value.
    `nonNormalizedValue` - The XMLString to fill in with the non-normalized value.
    `atName` - The name of the attribute being parsed (for error msgs).
    `checkEntities` - true if undeclared entities should be reported as VC violation, false if undeclared entities should be reported as WFC violation.
    `eleName` - The name of element to which this attribute belongs.
  Returns:
    true if the non-normalized and normalized value are the same Note: This method uses fStringBuffer2, anything in it at the time of calling is lost.

### scanExternalID

    protected void scanExternalID(java.lang.String[] identifiers,
                                  boolean optionalSystemId)
                           throws java.io.IOException,
                                  org.apache.xerces.xni.XNIException

  Scans External ID and return the public and system IDs.
  Parameters:
    `identifiers` - An array of size 2 to return the system id, and public id (in that order).
    `optionalSystemId` - Specifies whether the system id is optional. Note: This method uses fString and fStringBuffer, anything in them at the time of calling is lost.

### scanPubidLiteral

    protected boolean scanPubidLiteral(org.apache.xerces.xni.XMLString literal)
                                throws java.io.IOException,
                                       org.apache.xerces.xni.XNIException

  Scans public ID literal. [12] PubidLiteral ::= '"' PubidChar* '"' | "'" (PubidChar - "'")* "'" [13] PubidChar::= #x20 | #xD | #xA | [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%] The returned string is normalized according to the following rule, from http://www.w3.org/TR/REC-xml#dt-pubid: Before a match is attempted, all strings of white space in the public identifier must be normalized to single space characters (#x20), and leading and trailing white space must be removed.
  Parameters:
    `literal` - The string to fill in with the public ID literal.
  Returns:
    True on success. Note: This method uses fStringBuffer, anything in it at the time of calling is lost.

### normalizeWhitespace

    protected void normalizeWhitespace(org.apache.xerces.xni.XMLString value)

  Normalize whitespace in an XMLString converting all whitespace characters to space characters.

### normalizeWhitespace

    protected void normalizeWhitespace(org.apache.xerces.xni.XMLString value,
                                       int fromIndex)

  Normalize whitespace in an XMLString converting all whitespace characters to space characters.

### isUnchangedByNormalization

    protected int isUnchangedByNormalization(org.apache.xerces.xni.XMLString value)

  Checks whether this string would be unchanged by normalization.
  Returns:
    -1 if the value would be unchanged by normalization, otherwise the index of the first whitespace character which would be transformed.

### startEntity

    public void startEntity(java.lang.String name,
                            org.apache.xerces.xni.XMLResourceIdentifier identifier,
                            java.lang.String encoding,
                            org.apache.xerces.xni.Augmentations augs)
                     throws org.apache.xerces.xni.XNIException

  This method notifies of the start of an entity. The document entity has the pseudo-name of "[xml]" the DTD has the pseudo-name of "[dtd]" parameter entity names start with '%'; and general entities are just specified by their name.
  Parameters:
    `name` - The name of the entity.
    `identifier` - The resource identifier.
    `encoding` - The auto-detected IANA encoding name of the entity stream. This value will be null in those situations where the entity encoding is not auto-detected (e.g. internal entities or a document entity that is parsed from a java.io.Reader).
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### endEntity

    public void endEntity(java.lang.String name,
                          org.apache.xerces.xni.Augmentations augs)
                   throws org.apache.xerces.xni.XNIException

  This method notifies the end of an entity. The document entity has the pseudo-name of "[xml]" the DTD has the pseudo-name of "[dtd]" parameter entity names start with '%'; and general entities are just specified by their name.
  Parameters:
    `name` - The name of the entity.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### scanCharReferenceValue

    protected int scanCharReferenceValue(XMLStringBuffer buf,
                                         XMLStringBuffer buf2)
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Scans a character reference and append the corresponding chars to the specified buffer.

       [66] CharRef ::= '&#' [0-9]+ ';' | '&#x' [0-9a-fA-F]+ ';'

  Note: This method uses fStringBuffer, anything in it at the time of calling is lost.
  Parameters:
    `buf` - the character buffer to append chars to
    `buf2` - the character buffer to append non-normalized chars to
  Returns:
    the character value or (-1) on conversion failure

### isInvalid

    protected boolean isInvalid(int value)

### isInvalidLiteral

    protected boolean isInvalidLiteral(int value)

### isValidNameChar

    protected boolean isValidNameChar(int value)

### isValidNameStartChar

    protected boolean isValidNameStartChar(int value)

### isValidNCName

    protected boolean isValidNCName(int value)

### isValidNameStartHighSurrogate

    protected boolean isValidNameStartHighSurrogate(int value)

### versionSupported

    protected boolean versionSupported(java.lang.String version)

### getVersionNotSupportedKey

    protected java.lang.String getVersionNotSupportedKey()

### scanSurrogates

    protected boolean scanSurrogates(XMLStringBuffer buf)
                              throws java.io.IOException,
                                     org.apache.xerces.xni.XNIException

  Scans surrogates and append them to the specified buffer.

  Note: This assumes the current char has already been identified as a high surrogate.

  Parameters:
    `buf` - The StringBuffer to append the read surrogates to.
  Returns:
    True if it succeeded.

### reportFatalError

    protected void reportFatalError(java.lang.String msgId,
                                    java.lang.Object[] args)
                             throws org.apache.xerces.xni.XNIException

  Convenience function used in all XML scanners.

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