Xerces2 Implementation: Class XMLDTDScannerImpl

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## org.apache.xerces.impl
Class XMLDTDScannerImpl

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

All Implemented Interfaces:
  org.apache.xerces.xni.parser.XMLComponent, org.apache.xerces.xni.parser.XMLDTDContentModelSource, org.apache.xerces.xni.parser.XMLDTDScanner, org.apache.xerces.xni.parser.XMLDTDSource, XMLEntityHandler

Direct Known Subclasses:
  XML11DTDScannerImpl

public class XMLDTDScannerImpl
extends XMLScanner
implements org.apache.xerces.xni.parser.XMLDTDScanner, org.apache.xerces.xni.parser.XMLComponent, XMLEntityHandler

This class is responsible for scanning the declarations found in the internal and external subsets of a DTD in an XML document. The scanner acts as the sources for the DTD information which is communicated to the DTD handlers.

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

- http://xml.org/sax/features/validation
- 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

Version:
  $Id: XMLDTDScannerImpl.java,v 1.47 2004/02/11 18:55:20 mrglavas Exp $
Author:
  Arnaud Le Hors, IBM, Andy Clark, IBM, Glenn Marcy, IBM, Eric Ye, IBM

Field Summary
`protected org.apache.xerces.xni.XMLDTDContentModelHandler` | `fDTDContentModelHandler` DTD content model handler.
`protected org.apache.xerces.xni.XMLDTDHandler` | `fDTDHandler` DTD handler.
`protected int` | `fScannerState` Scanner state.
`protected boolean` | `fSeenExternalDTD` Seen external DTD.
`protected boolean` | `fSeenExternalPE` Seen external parameter entity.
`protected boolean` | `fStandalone` Standalone.
`protected static int` | `SCANNER_STATE_END_OF_INPUT` Scanner state: end of input.
`protected static int` | `SCANNER_STATE_MARKUP_DECL` Scanner state: markup declaration.
`protected static int` | `SCANNER_STATE_TEXT_DECL` Scanner state: text declaration.

Fields inherited from class org.apache.xerces.impl.XMLScanner
`DEBUG_ATTR_NORMALIZATION, ENTITY_MANAGER, ERROR_REPORTER, fAmpSymbol, fAposSymbol, fCharRefLiteral, fEncodingSymbol, fEntityDepth, fEntityManager, fEntityScanner, fErrorReporter, fGtSymbol, fLtSymbol, fNamespaces, fNotifyCharRefs, fParserSettings, fQuotSymbol, fReportEntity, fResourceIdentifier, fScanningAttribute, fStandaloneSymbol, fSymbolTable, fValidation, fVersionSymbol, NAMESPACES, NOTIFY_CHAR_REFS, PARSER_SETTINGS, SYMBOL_TABLE, VALIDATION`

Constructor Summary
`XMLDTDScannerImpl()` Default constructor.
`XMLDTDScannerImpl(SymbolTable symbolTable, XMLErrorReporter errorReporter, XMLEntityManager entityManager)` Constructor for he use of non-XMLComponentManagers.

Method Summary
`void` | `endEntity(java.lang.String name)` This method notifies the end of an entity.
`org.apache.xerces.xni.XMLDTDContentModelHandler` | `getDTDContentModelHandler()` getDTDContentModelHandler
`org.apache.xerces.xni.XMLDTDHandler` | `getDTDHandler()` getDTDHandler
`java.lang.Boolean` | `getFeatureDefault(java.lang.String featureId)` Returns the default state for a feature, or null if this component does not want to report a default value for this feature.
`java.lang.Object` | `getPropertyDefault(java.lang.String propertyId)` Returns the default state for a property, or null if this component does not want to report a default value for this property.
`java.lang.String[]` | `getRecognizedFeatures()` Returns a list of feature identifiers that are recognized by this component.
`java.lang.String[]` | `getRecognizedProperties()` Returns a list of property identifiers that are recognized by this component.
`void` | `reset()`
`void` | `reset(org.apache.xerces.xni.parser.XMLComponentManager componentManager)` reset
`protected java.lang.String` | `scanAttDefaultDecl(java.lang.String elName, java.lang.String atName, java.lang.String type, org.apache.xerces.xni.XMLString defaultVal, org.apache.xerces.xni.XMLString nonNormalizedDefaultVal)` Scans an attribute default declaration
`protected void` | `scanAttlistDecl()` Scans an attlist declaration
`protected void` | `scanComment()` Scans a comment.
`protected boolean` | `scanDecls(boolean complete)` Dispatch an XML "event".
`boolean` | `scanDTDExternalSubset(boolean complete)` Scans the external subset of the document.
`boolean` | `scanDTDInternalSubset(boolean complete, boolean standalone, boolean hasExternalSubset)` Scans the internal subset of the document.
`protected void` | `scanElementDecl()` Scans an element declaration
`protected void` | `scanEntityValue(org.apache.xerces.xni.XMLString value, org.apache.xerces.xni.XMLString nonNormalizedValue)` Scans an entity value.
`protected boolean` | `scanningInternalSubset()`
`protected void` | `scanPIData(java.lang.String target, org.apache.xerces.xni.XMLString data)` Scans a processing data.
`protected boolean` | `scanTextDecl()` Dispatch an XML "event".
`void` | `setDTDContentModelHandler(org.apache.xerces.xni.XMLDTDContentModelHandler dtdContentModelHandler)` setDTDContentModelHandler
`void` | `setDTDHandler(org.apache.xerces.xni.XMLDTDHandler dtdHandler)` setDTDHandler
`void` | `setInputSource(org.apache.xerces.xni.parser.XMLInputSource inputSource)` Sets the input source.
`protected void` | `setScannerState(int state)` Sets the scanner state.
`void` | `startEntity(java.lang.String name, org.apache.xerces.xni.XMLResourceIdentifier identifier, java.lang.String encoding)` This method notifies of the start of an entity.
`protected void` | `startPE(java.lang.String name, boolean literal)` start a parameter entity dealing with the textdecl if there is any

Methods inherited from class org.apache.xerces.impl.XMLScanner
`getFeature, getVersionNotSupportedKey, isInvalid, isInvalidLiteral, isValidNameChar, isValidNameStartChar, isValidNameStartHighSurrogate, isValidNCName, normalizeWhitespace, reportFatalError, scanAttributeValue, scanCharReferenceValue, scanComment, scanExternalID, scanPI, scanPseudoAttribute, scanPubidLiteral, scanSurrogates, scanXMLDeclOrTextDecl, setFeature, setProperty, versionSupported`

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
`setFeature, setProperty`

Field Detail

### SCANNER_STATE_END_OF_INPUT

    protected static final int SCANNER_STATE_END_OF_INPUT

  Scanner state: end of input.

### SCANNER_STATE_TEXT_DECL

    protected static final int SCANNER_STATE_TEXT_DECL

  Scanner state: text declaration.

### SCANNER_STATE_MARKUP_DECL

    protected static final int SCANNER_STATE_MARKUP_DECL

  Scanner state: markup declaration.

### fDTDHandler

    protected org.apache.xerces.xni.XMLDTDHandler fDTDHandler

  DTD handler.

### fDTDContentModelHandler

    protected org.apache.xerces.xni.XMLDTDContentModelHandler fDTDContentModelHandler

  DTD content model handler.

### fScannerState

    protected int fScannerState

  Scanner state.

### fStandalone

    protected boolean fStandalone

  Standalone.

### fSeenExternalDTD

    protected boolean fSeenExternalDTD

  Seen external DTD.

### fSeenExternalPE

    protected boolean fSeenExternalPE

  Seen external parameter entity.

Constructor Detail

### XMLDTDScannerImpl

    public XMLDTDScannerImpl()

  Default constructor.

### XMLDTDScannerImpl

    public XMLDTDScannerImpl(SymbolTable symbolTable,
                             XMLErrorReporter errorReporter,
                             XMLEntityManager entityManager)

  Constructor for he use of non-XMLComponentManagers.

Method Detail

### setInputSource

    public void setInputSource(org.apache.xerces.xni.parser.XMLInputSource inputSource)
                        throws java.io.IOException

  Sets the input source.
  Specified by:
    `setInputSource` in interface `org.apache.xerces.xni.parser.XMLDTDScanner`
  Parameters:
    `inputSource` - The input source or null.
  Throws:
    `java.io.IOException` - Thrown on i/o error.

### scanDTDExternalSubset

    public boolean scanDTDExternalSubset(boolean complete)
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Scans the external subset of the document.
  Specified by:
    `scanDTDExternalSubset` in interface `org.apache.xerces.xni.parser.XMLDTDScanner`
  Parameters:
    `complete` - True if the scanner should scan the document completely, pushing all events to the registered document handler. A value of false indicates that that the scanner should only scan the next portion of the document and return. A scanner instance is permitted to completely scan a document if it does not support this "pull" scanning model.
  Returns:
    True if there is more to scan, false otherwise.

### scanDTDInternalSubset

    public boolean scanDTDInternalSubset(boolean complete,
                                         boolean standalone,
                                         boolean hasExternalSubset)
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Scans the internal subset of the document.
  Specified by:
    `scanDTDInternalSubset` in interface `org.apache.xerces.xni.parser.XMLDTDScanner`
  Parameters:
    `complete` - True if the scanner should scan the document completely, pushing all events to the registered document handler. A value of false indicates that that the scanner should only scan the next portion of the document and return. A scanner instance is permitted to completely scan a document if it does not support this "pull" scanning model.
    `standalone` - True if the document was specified as standalone. This value is important for verifying certain well-formedness constraints.
    `hasExternalDTD` - True if the document has an external DTD. This allows the scanner to properly notify the handler of the end of the DTD in the absence of an external subset.
  Returns:
    True if there is more to scan, false otherwise.

### reset

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

  reset
  Specified by:
    `reset` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Overrides:
    `reset` in class `XMLScanner`
  Parameters:
    `componentManager` -

### reset

    public void reset()

  Overrides:
    `reset` in class `XMLScanner`

### getRecognizedFeatures

    public java.lang.String[] getRecognizedFeatures()

  Returns a list of feature identifiers that are recognized by this component. This method may return null if no features are recognized by this component.
  Specified by:
    `getRecognizedFeatures` in interface `org.apache.xerces.xni.parser.XMLComponent`

### getRecognizedProperties

    public java.lang.String[] getRecognizedProperties()

  Returns a list of property identifiers that are recognized by this component. This method may return null if no properties are recognized by this component.
  Specified by:
    `getRecognizedProperties` in interface `org.apache.xerces.xni.parser.XMLComponent`

### getFeatureDefault

    public java.lang.Boolean getFeatureDefault(java.lang.String featureId)

  Returns the default state for a feature, or null if this component does not want to report a default value for this feature.
  Specified by:
    `getFeatureDefault` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Parameters:
    `featureId` - The feature identifier.
  Since:
    Xerces 2.2.0

### getPropertyDefault

    public java.lang.Object getPropertyDefault(java.lang.String propertyId)

  Returns the default state for a property, or null if this component does not want to report a default value for this property.
  Specified by:
    `getPropertyDefault` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Parameters:
    `propertyId` - The property identifier.
  Since:
    Xerces 2.2.0

### setDTDHandler

    public void setDTDHandler(org.apache.xerces.xni.XMLDTDHandler dtdHandler)

  setDTDHandler
  Specified by:
    `setDTDHandler` in interface `org.apache.xerces.xni.parser.XMLDTDSource`
  Parameters:
    `dtdHandler` -

### getDTDHandler

    public org.apache.xerces.xni.XMLDTDHandler getDTDHandler()

  getDTDHandler
  Specified by:
    `getDTDHandler` in interface `org.apache.xerces.xni.parser.XMLDTDSource`
  Returns:
    the XMLDTDHandler

### setDTDContentModelHandler

    public void setDTDContentModelHandler(org.apache.xerces.xni.XMLDTDContentModelHandler dtdContentModelHandler)

  setDTDContentModelHandler
  Specified by:
    `setDTDContentModelHandler` in interface `org.apache.xerces.xni.parser.XMLDTDContentModelSource`
  Parameters:
    `dtdContentModelHandler` -

### getDTDContentModelHandler

    public org.apache.xerces.xni.XMLDTDContentModelHandler getDTDContentModelHandler()

  getDTDContentModelHandler
  Specified by:
    `getDTDContentModelHandler` in interface `org.apache.xerces.xni.parser.XMLDTDContentModelSource`
  Returns:
    XMLDTDContentModelHandler

### startEntity

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

  This method notifies of the start of an entity. The DTD has the pseudo-name of "[dtd]" parameter entity names start with '%'; and general entities are just specified by their name.
  Specified by:
    `startEntity` in interface `XMLEntityHandler`
  Overrides:
    `startEntity` in class `XMLScanner`
  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).
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### endEntity

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

  This method notifies the end of an entity. The DTD has the pseudo-name of "[dtd]" parameter entity names start with '%'; and general entities are just specified by their name.
  Specified by:
    `endEntity` in interface `XMLEntityHandler`
  Overrides:
    `endEntity` in class `XMLScanner`
  Parameters:
    `name` - The name of the entity.
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### setScannerState

    protected final void setScannerState(int state)

  Sets the scanner state.
  Parameters:
    `state` - The new scanner state.

### scanningInternalSubset

    protected final boolean scanningInternalSubset()

### startPE

    protected void startPE(java.lang.String name,
                           boolean literal)
                    throws java.io.IOException,
                           org.apache.xerces.xni.XNIException

  start a parameter entity dealing with the textdecl if there is any
  Parameters:
    `name` - The name of the parameter entity to start (without the '%')
    `literal` - Whether this is happening within a literal

### scanTextDecl

    protected final boolean scanTextDecl()
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Dispatch an XML "event".
  Parameters:
    `complete` - True if this method is intended to scan and dispatch as much as possible.
  Returns:
    True if a TextDecl was scanned.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown on parse error.

### scanPIData

    protected final 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)
  Overrides:
    `scanPIData` in class `XMLScanner`
  Parameters:
    `target` - The PI target
    `data` - The string to fill in with the data

### scanComment

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

  Scans a comment.

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

  Note: Called after scanning past '<!--'

### scanElementDecl

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

  Scans an element declaration

       [45]    elementdecl    ::=    '<!ELEMENT' S Name S contentspec S? '>'
       [46]    contentspec    ::=    'EMPTY' | 'ANY' | Mixed | children

  Note: Called after scanning past '<!ELEMENT'

### scanAttlistDecl

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

  Scans an attlist declaration

       [52]  AttlistDecl    ::=   '<!ATTLIST' S Name AttDef* S? '>'
       [53]  AttDef         ::=   S Name S AttType S DefaultDecl

  Note: Called after scanning past '<!ATTLIST'

### scanAttDefaultDecl

    protected final java.lang.String scanAttDefaultDecl(java.lang.String elName,
                                                        java.lang.String atName,
                                                        java.lang.String type,
                                                        org.apache.xerces.xni.XMLString defaultVal,
                                                        org.apache.xerces.xni.XMLString nonNormalizedDefaultVal)
                                                 throws java.io.IOException,
                                                        org.apache.xerces.xni.XNIException

  Scans an attribute default declaration

       [60] DefaultDecl ::= '#REQUIRED' | '#IMPLIED' | (('#FIXED' S)? AttValue)

  Parameters:
    `name` - The name of the attribute being scanned.
    `defaultVal` - The string to fill in with the default value.

### scanEntityValue

    protected final void scanEntityValue(org.apache.xerces.xni.XMLString value,
                                         org.apache.xerces.xni.XMLString nonNormalizedValue)
                                  throws java.io.IOException,
                                         org.apache.xerces.xni.XNIException

  Scans an entity value.
  Parameters:
    `value` - The string to fill in with the value.
    `nonNormalizedValue` - The string to fill in with the non-normalized value. Note: This method uses fString, fStringBuffer (through the use of scanCharReferenceValue), and fStringBuffer2, anything in them at the time of calling is lost.

### scanDecls

    protected final boolean scanDecls(boolean complete)
                               throws java.io.IOException,
                                      org.apache.xerces.xni.XNIException

  Dispatch an XML "event".
  Parameters:
    `complete` - True if this method is intended to scan and dispatch as much as possible.
  Returns:
    True if there is more to scan.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown on parse error.

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