Xerces2 Implementation: Class XMLEntityManager

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## org.apache.xerces.impl
Class XMLEntityManager

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

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

public class XMLEntityManager
extends java.lang.Object
implements org.apache.xerces.xni.parser.XMLComponent, org.apache.xerces.xni.parser.XMLEntityResolver

The entity manager handles the registration of general and parameter entities; resolves entities; and starts entities. The entity manager is a central component in a standard parser configuration and this class works directly with the entity scanner to manage the underlying xni.

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/external-general-entities
- http://xml.org/sax/features/external-parameter-entities
- http://apache.org/xml/features/allow-java-encodings
- http://apache.org/xml/properties/internal/symbol-table
- http://apache.org/xml/properties/internal/error-reporter
- http://apache.org/xml/properties/internal/entity-resolver

# INTERNAL:

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

Version:
  $Id: XMLEntityManager.java 572040 2007-09-02 17:24:29Z mrglavas $
Author:
  Andy Clark, IBM, Arnaud Le Hors, IBM

Inner Class Summary
`static class` | `XMLEntityManager.Entity` Entity information.
`protected static class` | `XMLEntityManager.ExternalEntity` External entity.
`protected static class` | `XMLEntityManager.InternalEntity` Internal entity.
`protected class` | `XMLEntityManager.RewindableInputStream` This class wraps the byte inputstreams we're presented with.
`class` | `XMLEntityManager.ScannedEntity` Entity state.

Field Summary
`protected static java.lang.String` | `ALLOW_JAVA_ENCODINGS` Feature identifier: allow Java encodings.
`protected static java.lang.String` | `BUFFER_SIZE` property identifier: buffer size.
`static int` | `DEFAULT_BUFFER_SIZE` Default buffer size (2048).
`static int` | `DEFAULT_INTERNAL_BUFFER_SIZE` Default internal entity buffer size (512).
`static int` | `DEFAULT_XMLDECL_BUFFER_SIZE` Default buffer size before we've finished with the XMLDecl:
`protected static java.lang.String` | `ENTITY_RESOLVER` Property identifier: entity resolver.
`protected static java.lang.String` | `ERROR_REPORTER` Property identifier: error reporter.
`protected static java.lang.String` | `EXTERNAL_GENERAL_ENTITIES` Feature identifier: external general entities.
`protected static java.lang.String` | `EXTERNAL_PARAMETER_ENTITIES` Feature identifier: external parameter entities.
`protected boolean` | `fAllowJavaEncodings` Allow Java encoding names.
`protected int` | `fBufferSize` Buffer size.
`protected XMLEntityManager.ScannedEntity` | `fCurrentEntity` Current entity.
`protected java.util.Hashtable` | `fDeclaredEntities` Shared declared entities.
`protected java.util.Hashtable` | `fEntities` Entities.
`protected int` | `fEntityExpansionCount`
`protected int` | `fEntityExpansionLimit`
`protected XMLEntityHandler` | `fEntityHandler` Entity handler.
`protected org.apache.xerces.xni.parser.XMLEntityResolver` | `fEntityResolver` Entity resolver.
`protected XMLEntityScanner` | `fEntityScanner` Current entity scanner.
`protected java.util.Stack` | `fEntityStack` Entity stack.
`protected XMLErrorReporter` | `fErrorReporter` Error reporter.
`protected boolean` | `fExternalGeneralEntities` External general entities.
`protected boolean` | `fExternalParameterEntities` External parameter entities.
`protected boolean` | `fHasPEReferences` True if the current document contains parameter entity references.
`protected boolean` | `fInExternalSubset`
`protected java.util.Stack` | `fReaderStack`
`protected SecurityManager` | `fSecurityManager`
`protected boolean` | `fStandalone` True if the document entity is standalone.
`protected boolean` | `fStrictURI` standard uri conformant (strict uri).
`protected SymbolTable` | `fSymbolTable` Symbol table.
`protected boolean` | `fValidation` Validation.
`protected ValidationManager` | `fValidationManager` Validation manager.
`protected boolean` | `fWarnDuplicateEntityDef` warn on duplicate Entity declaration.
`protected XMLEntityScanner` | `fXML10EntityScanner` XML 1.0 entity scanner.
`protected XMLEntityScanner` | `fXML11EntityScanner` XML 1.1 entity scanner.
`protected static java.lang.String` | `PARSER_SETTINGS`
`protected static java.lang.String` | `SECURITY_MANAGER` property identifier: security manager.
`protected static java.lang.String` | `STANDARD_URI_CONFORMANT` Feature identifier: standard uri conformant
`protected static java.lang.String` | `SYMBOL_TABLE` Property identifier: symbol table.
`protected static java.lang.String` | `VALIDATION` Feature identifier: validation.
`protected static java.lang.String` | `VALIDATION_MANAGER`
`protected static java.lang.String` | `WARN_ON_DUPLICATE_ENTITYDEF` Feature identifier: warn on duplicate EntityDef

Constructor Summary
`XMLEntityManager()` Default constructor.
`XMLEntityManager(XMLEntityManager entityManager)` Constructs an entity manager that shares the specified entity declarations during each parse.

Method Summary
`static void` | `absolutizeAgainstUserDir(URI uri)` Absolutizes a URI using the current value of the "user.dir" property as the base URI.
`void` | `addExternalEntity(java.lang.String name, java.lang.String publicId, java.lang.String literalSystemId, java.lang.String baseSystemId)` Adds an external entity declaration.
`void` | `addInternalEntity(java.lang.String name, java.lang.String text)` Adds an internal entity declaration.
`void` | `addUnparsedEntity(java.lang.String name, java.lang.String publicId, java.lang.String systemId, java.lang.String baseSystemId, java.lang.String notation)` Adds an unparsed entity declaration.
`void` | `closeReaders()` Close all opened InputStreams and Readers opened by this parser.
`static java.io.OutputStream` | `createOutputStream(java.lang.String uri)`
`protected java.io.Reader` | `createReader(java.io.InputStream inputStream, java.lang.String encoding, java.lang.Boolean isBigEndian)` Creates a reader capable of reading the given input stream in the specified encoding.
`void` | `endExternalSubset()`
`static java.lang.String` | `expandSystemId(java.lang.String systemId, java.lang.String baseSystemId, boolean strict)` Expands a system id and returns the system id as a URI, if it can be expanded.
`protected static java.lang.String` | `fixURI(java.lang.String str)` Fixes a platform dependent filename to standard URI form.
`XMLEntityManager.ScannedEntity` | `getCurrentEntity()`
`org.apache.xerces.xni.XMLResourceIdentifier` | `getCurrentResourceIdentifier()`
`protected java.lang.Object[]` | `getEncodingName(byte[] b4, int count)` Returns the IANA encoding name that is auto-detected from the bytes specified, with the endian-ness of that encoding where appropriate.
`XMLEntityScanner` | `getEntityScanner()` Returns the entity scanner.
`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.
`boolean` | `isDeclaredEntity(java.lang.String entityName)` Checks whether an entity given by name is declared.
`boolean` | `isEntityDeclInExternalSubset(java.lang.String entityName)` Checks whether the declaration of an entity given by name is // in the external subset.
`boolean` | `isExternalEntity(java.lang.String entityName)` Checks whether an entity given by name is external.
`boolean` | `isStandalone()` Returns true if the document entity is standalone.
`boolean` | `isUnparsedEntity(java.lang.String entityName)` Checks whether an entity given by name is unparsed.
`void` | `reset()`
`void` | `reset(org.apache.xerces.xni.parser.XMLComponentManager componentManager)` Resets the component.
`org.apache.xerces.xni.parser.XMLInputSource` | `resolveEntity(org.apache.xerces.xni.XMLResourceIdentifier resourceIdentifier)` Resolves the specified public and system identifiers.
`void` | `setEntityHandler(XMLEntityHandler entityHandler)` Sets the entity handler.
`void` | `setFeature(java.lang.String featureId, boolean state)` Sets the state of a feature.
`static void` | `setInstanceFollowRedirects(java.net.HttpURLConnection urlCon, boolean followRedirects)` Attempt to set whether redirects will be followed for an `HttpURLConnection`.
`void` | `setProperty(java.lang.String propertyId, java.lang.Object value)` Sets the value of a property.
`void` | `setScannerVersion(short version)`
`void` | `setStandalone(boolean standalone)` Sets whether the document entity is standalone.
`java.lang.String` | `setupCurrentEntity(java.lang.String name, org.apache.xerces.xni.parser.XMLInputSource xmlInputSource, boolean literal, boolean isExternal)` This method uses the passed-in XMLInputSource to make fCurrentEntity usable for reading.
`void` | `startDocumentEntity(org.apache.xerces.xni.parser.XMLInputSource xmlInputSource)` Starts the document entity.
`void` | `startDTDEntity(org.apache.xerces.xni.parser.XMLInputSource xmlInputSource)` Starts the DTD entity.
`void` | `startEntity(java.lang.String entityName, boolean literal)` Starts a named entity.
`void` | `startEntity(java.lang.String name, org.apache.xerces.xni.parser.XMLInputSource xmlInputSource, boolean literal, boolean isExternal)` Starts an entity.
`void` | `startExternalSubset()`

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

Field Detail

### DEFAULT_BUFFER_SIZE

    public static final int DEFAULT_BUFFER_SIZE

  Default buffer size (2048).

### DEFAULT_XMLDECL_BUFFER_SIZE

    public static final int DEFAULT_XMLDECL_BUFFER_SIZE

  Default buffer size before we've finished with the XMLDecl:

### DEFAULT_INTERNAL_BUFFER_SIZE

    public static final int DEFAULT_INTERNAL_BUFFER_SIZE

  Default internal entity buffer size (512).

### VALIDATION

    protected static final java.lang.String VALIDATION

  Feature identifier: validation.

### EXTERNAL_GENERAL_ENTITIES

    protected static final java.lang.String EXTERNAL_GENERAL_ENTITIES

  Feature identifier: external general entities.

### EXTERNAL_PARAMETER_ENTITIES

    protected static final java.lang.String EXTERNAL_PARAMETER_ENTITIES

  Feature identifier: external parameter entities.

### ALLOW_JAVA_ENCODINGS

    protected static final java.lang.String ALLOW_JAVA_ENCODINGS

  Feature identifier: allow Java encodings.

### WARN_ON_DUPLICATE_ENTITYDEF

    protected static final java.lang.String WARN_ON_DUPLICATE_ENTITYDEF

  Feature identifier: warn on duplicate EntityDef

### STANDARD_URI_CONFORMANT

    protected static final java.lang.String STANDARD_URI_CONFORMANT

  Feature identifier: standard uri conformant

### 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_RESOLVER

    protected static final java.lang.String ENTITY_RESOLVER

  Property identifier: entity resolver.

### VALIDATION_MANAGER

    protected static final java.lang.String VALIDATION_MANAGER

### BUFFER_SIZE

    protected static final java.lang.String BUFFER_SIZE

  property identifier: buffer size.

### SECURITY_MANAGER

    protected static final java.lang.String SECURITY_MANAGER

  property identifier: security manager.

### fValidation

    protected boolean fValidation

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

### fExternalGeneralEntities

    protected boolean fExternalGeneralEntities

  External general entities. This feature identifier is: http://xml.org/sax/features/external-general-entities

### fExternalParameterEntities

    protected boolean fExternalParameterEntities

  External parameter entities. This feature identifier is: http://xml.org/sax/features/external-parameter-entities

### fAllowJavaEncodings

    protected boolean fAllowJavaEncodings

  Allow Java encoding names. This feature identifier is: http://apache.org/xml/features/allow-java-encodings

### fWarnDuplicateEntityDef

    protected boolean fWarnDuplicateEntityDef

  warn on duplicate Entity declaration. http://apache.org/xml/features/warn-on-duplicate-entitydef

### fStrictURI

    protected boolean fStrictURI

  standard uri conformant (strict uri). http://apache.org/xml/features/standard-uri-conformant

### fSymbolTable

    protected SymbolTable fSymbolTable

  Symbol table. This property identifier is: http://apache.org/xml/properties/internal/symbol-table

### fErrorReporter

    protected XMLErrorReporter fErrorReporter

  Error reporter. This property identifier is: http://apache.org/xml/properties/internal/error-reporter

### fEntityResolver

    protected org.apache.xerces.xni.parser.XMLEntityResolver fEntityResolver

  Entity resolver. This property identifier is: http://apache.org/xml/properties/internal/entity-resolver

### fValidationManager

    protected ValidationManager fValidationManager

  Validation manager. This property identifier is: http://apache.org/xml/properties/internal/validation-manager

### fBufferSize

    protected int fBufferSize

  Buffer size. We get this value from a property. The default size is used if the input buffer size property is not specified. REVISIT: do we need a property for internal entity buffer size?

### fSecurityManager

    protected SecurityManager fSecurityManager

### fStandalone

    protected boolean fStandalone

  True if the document entity is standalone. This should really only be set by the document source (e.g. XMLDocumentScanner).

### fHasPEReferences

    protected boolean fHasPEReferences

  True if the current document contains parameter entity references.

### fInExternalSubset

    protected boolean fInExternalSubset

### fEntityHandler

    protected XMLEntityHandler fEntityHandler

  Entity handler.

### fEntityScanner

    protected XMLEntityScanner fEntityScanner

  Current entity scanner.

### fXML10EntityScanner

    protected XMLEntityScanner fXML10EntityScanner

  XML 1.0 entity scanner.

### fXML11EntityScanner

    protected XMLEntityScanner fXML11EntityScanner

  XML 1.1 entity scanner.

### fEntityExpansionLimit

    protected int fEntityExpansionLimit

### fEntityExpansionCount

    protected int fEntityExpansionCount

### fEntities

    protected final java.util.Hashtable fEntities

  Entities.

### fEntityStack

    protected final java.util.Stack fEntityStack

  Entity stack.

### fCurrentEntity

    protected XMLEntityManager.ScannedEntity fCurrentEntity

  Current entity.

### fDeclaredEntities

    protected java.util.Hashtable fDeclaredEntities

  Shared declared entities.

### fReaderStack

    protected java.util.Stack fReaderStack

Constructor Detail

### XMLEntityManager

    public XMLEntityManager()

  Default constructor.

### XMLEntityManager

    public XMLEntityManager(XMLEntityManager entityManager)

  Constructs an entity manager that shares the specified entity declarations during each parse.

  REVISIT: We might want to think about the "right" way to expose the list of declared entities. For now, the knowledge how to access the entity declarations is implicit.

Method Detail

### setStandalone

    public void setStandalone(boolean standalone)

  Sets whether the document entity is standalone.
  Parameters:
    `standalone` - True if document entity is standalone.

### isStandalone

    public boolean isStandalone()

  Returns true if the document entity is standalone.

### setEntityHandler

    public void setEntityHandler(XMLEntityHandler entityHandler)

  Sets the entity handler. When an entity starts and ends, the entity handler is notified of the change.
  Parameters:
    `entityHandler` - The new entity handler.

### getCurrentResourceIdentifier

    public org.apache.xerces.xni.XMLResourceIdentifier getCurrentResourceIdentifier()

### getCurrentEntity

    public XMLEntityManager.ScannedEntity getCurrentEntity()

### addInternalEntity

    public void addInternalEntity(java.lang.String name,
                                  java.lang.String text)

  Adds an internal entity declaration.

  Note: This method ignores subsequent entity declarations.

  Note: The name should be a unique symbol. The SymbolTable can be used for this purpose.

  Parameters:
    `name` - The name of the entity.
    `text` - The text of the entity.
  See Also:
    `SymbolTable`

### addExternalEntity

    public void addExternalEntity(java.lang.String name,
                                  java.lang.String publicId,
                                  java.lang.String literalSystemId,
                                  java.lang.String baseSystemId)
                           throws java.io.IOException

  Adds an external entity declaration.

  Note: This method ignores subsequent entity declarations.

  Note: The name should be a unique symbol. The SymbolTable can be used for this purpose.

  Parameters:
    `name` - The name of the entity.
    `publicId` - The public identifier of the entity.
    `literalSystemId` - The system identifier of the entity.
    `baseSystemId` - The base system identifier of the entity. This is the system identifier of the entity where the entity being added and is used to expand the system identifier when the system identifier is a relative URI. When null the system identifier of the first external entity on the stack is used instead.
  See Also:
    `SymbolTable`

### isExternalEntity

    public boolean isExternalEntity(java.lang.String entityName)

  Checks whether an entity given by name is external.
  Parameters:
    `entityName` - The name of the entity to check.
  Returns:
    True if the entity is external, false otherwise (including when the entity is not declared).

### isEntityDeclInExternalSubset

    public boolean isEntityDeclInExternalSubset(java.lang.String entityName)

  Checks whether the declaration of an entity given by name is // in the external subset.
  Parameters:
    `entityName` - The name of the entity to check.
  Returns:
    True if the entity was declared in the external subset, false otherwise (including when the entity is not declared).

### addUnparsedEntity

    public void addUnparsedEntity(java.lang.String name,
                                  java.lang.String publicId,
                                  java.lang.String systemId,
                                  java.lang.String baseSystemId,
                                  java.lang.String notation)

  Adds an unparsed entity declaration.

  Note: This method ignores subsequent entity declarations.

  Note: The name should be a unique symbol. The SymbolTable can be used for this purpose.

  Parameters:
    `name` - The name of the entity.
    `publicId` - The public identifier of the entity.
    `systemId` - The system identifier of the entity.
    `notation` - The name of the notation.
  See Also:
    `SymbolTable`

### isUnparsedEntity

    public boolean isUnparsedEntity(java.lang.String entityName)

  Checks whether an entity given by name is unparsed.
  Parameters:
    `entityName` - The name of the entity to check.
  Returns:
    True if the entity is unparsed, false otherwise (including when the entity is not declared).

### isDeclaredEntity

    public boolean isDeclaredEntity(java.lang.String entityName)

  Checks whether an entity given by name is declared.
  Parameters:
    `entityName` - The name of the entity to check.
  Returns:
    True if the entity is declared, false otherwise.

### resolveEntity

    public org.apache.xerces.xni.parser.XMLInputSource resolveEntity(org.apache.xerces.xni.XMLResourceIdentifier resourceIdentifier)
                                                              throws java.io.IOException,
                                                                     org.apache.xerces.xni.XNIException

  Resolves the specified public and system identifiers. This method first attempts to resolve the entity based on the EntityResolver registered by the application. If no entity resolver is registered or if the registered entity handler is unable to resolve the entity, then default entity resolution will occur.
  Specified by:
    `resolveEntity` in interface `org.apache.xerces.xni.parser.XMLEntityResolver`
  Parameters:
    `resourceIdentifier` - The XMLResourceIdentifier for the resource to resolve.
  Returns:
    Returns an input source that wraps the resolved entity. This method will never return null.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown by entity resolver to signal an error.

### startEntity

    public void startEntity(java.lang.String entityName,
                            boolean literal)
                     throws java.io.IOException,
                            org.apache.xerces.xni.XNIException

  Starts a named entity.
  Parameters:
    `entityName` - The name of the entity to start.
    `literal` - True if this entity is started within a literal value.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown by entity handler to signal an error.

### startDocumentEntity

    public void startDocumentEntity(org.apache.xerces.xni.parser.XMLInputSource xmlInputSource)
                             throws java.io.IOException,
                                    org.apache.xerces.xni.XNIException

  Starts the document entity. The document entity has the "[xml]" pseudo-name.
  Parameters:
    `xmlInputSource` - The input source of the document entity.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown by entity handler to signal an error.

### startDTDEntity

    public void startDTDEntity(org.apache.xerces.xni.parser.XMLInputSource xmlInputSource)
                        throws java.io.IOException,
                               org.apache.xerces.xni.XNIException

  Starts the DTD entity. The DTD entity has the "[dtd]" pseudo-name.
  Parameters:
    `xmlInputSource` - The input source of the DTD entity.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown by entity handler to signal an error.

### startExternalSubset

    public void startExternalSubset()

### endExternalSubset

    public void endExternalSubset()

### startEntity

    public void startEntity(java.lang.String name,
                            org.apache.xerces.xni.parser.XMLInputSource xmlInputSource,
                            boolean literal,
                            boolean isExternal)
                     throws java.io.IOException,
                            org.apache.xerces.xni.XNIException

  Starts an entity.

  This method can be used to insert an application defined XML entity stream into the parsing stream.

  Parameters:
    `name` - The name of the entity.
    `xmlInputSource` - The input source of the entity.
    `literal` - True if this entity is started within a literal value.
    `isExternal` - whether this entity should be treated as an internal or external entity.
  Throws:
    `java.io.IOException` - Thrown on i/o error.
    `org.apache.xerces.xni.XNIException` - Thrown by entity handler to signal an error.

### setupCurrentEntity

    public java.lang.String setupCurrentEntity(java.lang.String name,
                                               org.apache.xerces.xni.parser.XMLInputSource xmlInputSource,
                                               boolean literal,
                                               boolean isExternal)
                                        throws java.io.IOException,
                                               org.apache.xerces.xni.XNIException

  This method uses the passed-in XMLInputSource to make fCurrentEntity usable for reading.
  Parameters:
    `name` - name of the entity (XML is it's the document entity)
    `xmlInputSource` - the input source, with sufficient information to begin scanning characters.
    `literal` - True if this entity is started within a literal value.
    `isExternal` - whether this entity should be treated as an internal or external entity.
  Returns:
    the encoding of the new entity or null if a character stream was employed
  Throws:
    `java.io.IOException` - if anything can't be read XNIException If any parser-specific goes wrong.

### setScannerVersion

    public void setScannerVersion(short version)

### getEntityScanner

    public XMLEntityScanner getEntityScanner()

  Returns the entity scanner.

### closeReaders

    public void closeReaders()

  Close all opened InputStreams and Readers opened by this parser.

### reset

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

  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` - Thrown by component on initialization error. For example, if a feature or property is required for the operation of the component, the component manager may throw a SAXNotRecognizedException or a SAXNotSupportedException.

### reset

    public void reset()

### 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`

### setFeature

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

  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`
  Parameters:
    `featureId` - The feature identifier.
    `state` - The state of the feature.
  Throws:
    `SAXNotRecognizedException` - The component should not throw this exception.
    `SAXNotSupportedException` - The component should not throw this exception.

### 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`

### 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. This method is called by the component manager any time after reset when a property changes value.

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

  Specified by:
    `setProperty` in interface `org.apache.xerces.xni.parser.XMLComponent`
  Parameters:
    `propertyId` - The property identifier.
    `value` - The value of the property.
  Throws:
    `SAXNotRecognizedException` - The component should not throw this exception.
    `SAXNotSupportedException` - The component should not throw this exception.

### 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

### absolutizeAgainstUserDir

    public static void absolutizeAgainstUserDir(URI uri)
                                         throws URI.MalformedURIException

  Absolutizes a URI using the current value of the "user.dir" property as the base URI. If the URI is already absolute, this is a no-op.
  Parameters:
    `uri` - the URI to absolutize

### expandSystemId

    public static java.lang.String expandSystemId(java.lang.String systemId,
                                                  java.lang.String baseSystemId,
                                                  boolean strict)
                                           throws URI.MalformedURIException

  Expands a system id and returns the system id as a URI, if it can be expanded. A return value of null means that the identifier is already expanded. An exception thrown indicates a failure to expand the id.
  Parameters:
    `systemId` - The systemId to be expanded.
  Returns:
    Returns the URI string representing the expanded system identifier. A null value indicates that the given system identifier is already expanded.

### setInstanceFollowRedirects

    public static void setInstanceFollowRedirects(java.net.HttpURLConnection urlCon,
                                                  boolean followRedirects)

  Attempt to set whether redirects will be followed for an `HttpURLConnection`. This may fail on earlier JDKs which do not support setting this preference.

### createOutputStream

    public static java.io.OutputStream createOutputStream(java.lang.String uri)
                                                   throws java.io.IOException

### getEncodingName

    protected java.lang.Object[] getEncodingName(byte[] b4,
                                                 int count)

  Returns the IANA encoding name that is auto-detected from the bytes specified, with the endian-ness of that encoding where appropriate.
  Parameters:
    `b4` - The first four bytes of the input.
    `count` - The number of bytes actually read.
  Returns:
    a 2-element array: the first element, an IANA-encoding string, the second element a Boolean which is true iff the document is big endian, false if it's little-endian, and null if the distinction isn't relevant.

### createReader

    protected java.io.Reader createReader(java.io.InputStream inputStream,
                                          java.lang.String encoding,
                                          java.lang.Boolean isBigEndian)
                                   throws java.io.IOException

  Creates a reader capable of reading the given input stream in the specified encoding.
  Parameters:
    `inputStream` - The input stream.
    `encoding` - The encoding name that the input stream is encoded using. If the user has specified that Java encoding names are allowed, then the encoding name may be a Java encoding name; otherwise, it is an ianaEncoding name.
    `isBigEndian` - For encodings (like uCS-4), whose names cannot specify a byte order, this tells whether the order is bigEndian. null menas unknown or not relevant.
  Returns:
    Returns a reader.

### fixURI

    protected static java.lang.String fixURI(java.lang.String str)

  Fixes a platform dependent filename to standard URI form.
  Parameters:
    `str` - The string to fix.
  Returns:
    Returns the fixed URI string.

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