org.apache.xerces.jaxp.validation
Class XMLSchemaFactory

java.lang.Object
  javax.xml.validation.SchemaFactory
      org.apache.xerces.jaxp.validation.XMLSchemaFactory

public final class XMLSchemaFactory
extends SchemaFactory

SchemaFactory for XML Schema.

Version:

$Id: XMLSchemaFactory.java 542520 2007-05-29 13:55:53Z mrglavas $

Author:

Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)

Constructor Summary

XMLSchemaFactory()

Method Summary

ErrorHandler	getErrorHandler() Gets the current ErrorHandler set to this SchemaFactory.
boolean	getFeature(java.lang.String name) Look up the value of a feature flag.
java.lang.Object	getProperty(java.lang.String name) Look up the value of a property.
LSResourceResolver	getResourceResolver() Gets the current LSResourceResolver set to this SchemaFactory.
boolean	isSchemaLanguageSupported(java.lang.String schemaLanguage) Is specified schema supported by this SchemaFactory?
Schema	newSchema() Creates a special Schema object.
Schema	newSchema(Source[] schemas) Parses the specified source(s) as a schema and returns it as a schema.
void	setErrorHandler(ErrorHandler errorHandler) Sets the ErrorHandler to receive errors encountered during the newSchema method invocation.
void	setFeature(java.lang.String name, boolean value) Set the value of a feature flag.
void	setProperty(java.lang.String name, java.lang.Object object) Set the value of a property.
void	setResourceResolver(LSResourceResolver resourceResolver) Sets the LSResourceResolver to customize resource resolution when parsing schemas.

Methods inherited from class javax.xml.validation.SchemaFactory

newInstance, newSchema, newSchema, newSchema

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XMLSchemaFactory

public XMLSchemaFactory()

Method Detail

isSchemaLanguageSupported

public boolean isSchemaLanguageSupported(java.lang.String schemaLanguage)

Is specified schema supported by this SchemaFactory?

Specified by:

isSchemaLanguageSupported in class SchemaFactory

Parameters:

schemaLanguage - Specifies the schema language which the returned SchemaFactory will understand. schemaLanguage must specify a valid schema language.

Returns:

true if SchemaFactory supports schemaLanguage, else false.

Throws:

java.lang.NullPointerException - If schemaLanguage is null.

java.lang.IllegalArgumentException - If schemaLanguage.length() == 0 or schemaLanguage does not specify a valid schema language.

getResourceResolver

public LSResourceResolver getResourceResolver()

Description copied from class: SchemaFactory

Gets the current LSResourceResolver set to this SchemaFactory.

Specified by:

getResourceResolver in class SchemaFactory

Returns:

This method returns the object that was last set through the SchemaFactory.setResourceResolver(LSResourceResolver) method, or null if that method has never been called since this SchemaFactory has created.

See Also:

SchemaFactory.setErrorHandler(ErrorHandler)

setResourceResolver

public void setResourceResolver(LSResourceResolver resourceResolver)

Description copied from class: SchemaFactory

Sets the LSResourceResolver to customize resource resolution when parsing schemas.

SchemaFactory uses a LSResourceResolver when it needs to locate external resources while parsing schemas, although exactly what constitutes "locating external resources" is up to each schema language. For example, for W3C XML Schema, this includes files <include>d or <import>ed, and DTD referenced from schema files, etc.

Applications can call this method even during a Schema is being parsed.

When the LSResourceResolver is null, the implementation will behave as if the following LSResourceResolver is set:

 class DumbDOMResourceResolver implements LSResourceResolver {
     public LSInput resolveResource(
         String publicId, String systemId, String baseURI) {
         
         return null; // always return null
     }
 }
 

If a LSResourceResolver throws a RuntimeException (or instances of its derived classes), then the SchemaFactory will abort the parsing and the caller of the newSchema method will receive the same RuntimeException.

When a new SchemaFactory object is created, initially this field is set to null. This field will NOT be inherited to Schemas, Validators, or ValidatorHandlers that are created from this SchemaFactory.

Specified by:

setResourceResolver in class SchemaFactory

Parameters:

resourceResolver - A new resource resolver to be set. This parameter can be null.

getErrorHandler

public ErrorHandler getErrorHandler()

Description copied from class: SchemaFactory

Gets the current ErrorHandler set to this SchemaFactory.

Specified by:

getErrorHandler in class SchemaFactory

Returns:

This method returns the object that was last set through the SchemaFactory.setErrorHandler(ErrorHandler) method, or null if that method has never been called since this SchemaFactory has created.

See Also:

SchemaFactory.setErrorHandler(ErrorHandler)

setErrorHandler

public void setErrorHandler(ErrorHandler errorHandler)

Description copied from class: SchemaFactory

Sets the ErrorHandler to receive errors encountered during the newSchema method invocation.

Error handler can be used to customize the error handling process during schema parsing. When an ErrorHandler is set, errors found during the parsing of schemas will be first sent to the ErrorHandler.

The error handler can abort the parsing of a schema immediately by throwing SAXException from the handler. Or for example it can print an error to the screen and try to continue the processing by returning normally from the ErrorHandler

If any Throwable (or instances of its derived classes) is thrown from an ErrorHandler, the caller of the newSchema method will be thrown the same Throwable object.

SchemaFactory is not allowed to throw SAXException without first reporting it to ErrorHandler.

Applications can call this method even during a Schema is being parsed.

When the ErrorHandler is null, the implementation will behave as if the following ErrorHandler is set:

 class DraconianErrorHandler implements ErrorHandler {
     public void fatalError( SAXParseException e ) throws SAXException {
         throw e;
     }
     public void error( SAXParseException e ) throws SAXException {
         throw e;
     }
     public void warning( SAXParseException e ) throws SAXException {
         // noop
     }
 }
 

When a new SchemaFactory object is created, initially this field is set to null. This field will NOT be inherited to Schemas, Validators, or ValidatorHandlers that are created from this SchemaFactory.

Specified by:

setErrorHandler in class SchemaFactory

Parameters:

errorHandler - A new error handler to be set. This parameter can be null.

newSchema

public Schema newSchema(Source[] schemas)
                 throws SAXException

Description copied from class: SchemaFactory

Parses the specified source(s) as a schema and returns it as a schema.

The callee will read all the Sources and combine them into a single schema. The exact semantics of the combination depends on the schema language that this SchemaFactory object is created for.

When an ErrorHandler is set, the callee will report all the errors found in sources to the handler. If the handler throws an exception, it will abort the schema compilation and the same exception will be thrown from this method. Also, after an error is reported to a handler, the callee is allowed to abort the further processing by throwing it. If an error handler is not set, the callee will throw the first error it finds in the sources.

W3C XML Schema 1.0

The resulting schema contains components from the specified sources. The same result would be achieved if all these sources were imported, using appropriate values for schemaLocation and namespace, into a single schema document with a different targetNamespace and no components of its own, if the import elements were given in the same order as the sources. Section 4.2.3 of the XML Schema recommendation describes the options processors have in this regard. While a processor should be consistent in its treatment of JAXP schema sources and XML Schema imports, the behaviour between JAXP-compliant parsers may vary; in particular, parsers may choose to ignore all but the first <import> for a given namespace, regardless of information provided in schemaLocation.

If the parsed set of schemas includes error(s) as specified in the section 5.1 of the XML Schema spec, then the error must be reported to the ErrorHandler.

RELAX NG

For RELAX NG, this method must throw UnsupportedOperationException if schemas.length!=1.

Specified by:

newSchema in class SchemaFactory

Parameters:

schemas - inputs to be parsed. SchemaFactory is required to recognize SAXSource, StreamSource, and DOMSource.

Returns:

Always return a non-null valid Schema object. Note that when an error has been reported, there is no guarantee that the returned Schema object is meaningful.

Throws:

SAXException - If an error is found during processing the specified inputs. When an ErrorHandler is set, errors are reported to there first. See SchemaFactory.setErrorHandler(ErrorHandler).

newSchema

public Schema newSchema()
                 throws SAXException

Description copied from class: SchemaFactory

Creates a special Schema object.

The exact semantics of the returned Schema object depends on the schema language that this SchemaFactory is created for.

Also, implementations are allowed to use implementation-specific property/feature to alter the semantics of this method.

W3C XML Schema 1.0

For XML Schema, this method creates a Schema object that performs validation by using location hints specified in documents.

The returned Schema object assumes that if documents refer to the same URL in the schema location hints, they will always resolve to the same schema document. This asusmption allows implementations to reuse parsed results of schema documents so that multiple validations against the same schema will run faster.

Note that the use of schema location hints introduces a vulnerability to denial-of-service attacks.

RELAX NG

RELAX NG does not support this operation.

Specified by:

newSchema in class SchemaFactory

Returns:

Always return non-null valid Schema object.

Throws:

SAXException - If this operation is supported but failed for some reason.

getFeature

public boolean getFeature(java.lang.String name)
                   throws SAXNotRecognizedException,
                          SAXNotSupportedException

Description copied from class: SchemaFactory

Look up the value of a feature flag.

The feature name is any fully-qualified URI. It is possible for a SchemaFactory to recognize a feature name but temporarily be unable to return its value.

Implementors are free (and encouraged) to invent their own features, using names built on their own URIs.

Overrides:

getFeature in class SchemaFactory

Parameters:

name - The feature name, which is a non-null fully-qualified URI.

Returns:

The current value of the feature (true or false).

Throws:

SAXNotRecognizedException - If the feature value can't be assigned or retrieved.

SAXNotSupportedException - When the SchemaFactory recognizes the feature name but cannot determine its value at this time.

See Also:

SchemaFactory.setFeature(String, boolean)

getProperty

public java.lang.Object getProperty(java.lang.String name)
                             throws SAXNotRecognizedException,
                                    SAXNotSupportedException

Description copied from class: SchemaFactory

Look up the value of a property.

The property name is any fully-qualified URI. It is possible for a SchemaFactory to recognize a property name but temporarily be unable to return its value.

SchemaFactorys are not required to recognize any specific property names.

Implementors are free (and encouraged) to invent their own properties, using names built on their own URIs.

Overrides:

getProperty in class SchemaFactory

Parameters:

name - The property name, which is a non-null fully-qualified URI.

Returns:

The current value of the property.

Throws:

SAXNotRecognizedException - If the property value can't be assigned or retrieved.

SAXNotSupportedException - When the XMLReader recognizes the property name but cannot determine its value at this time.

See Also:

SchemaFactory.setProperty(String, Object)

setFeature

public void setFeature(java.lang.String name,
                       boolean value)
                throws SAXNotRecognizedException,
                       SAXNotSupportedException

Description copied from class: SchemaFactory

Set the value of a feature flag.

Feature can be used to control the way a SchemaFactory parses schemas, although SchemaFactorys are not required to recognize any specific feature names.

The feature name is any fully-qualified URI. It is possible for a SchemaFactory to expose a feature value but to be unable to change the current value.

All implementations are required to support the XMLConstants.FEATURE_SECURE_PROCESSING feature. When the feature is:

• true: the implementation will limit XML processing to conform to implementation limits. Examples include enity expansion limits and XML Schema constructs that would consume large amounts of resources. If XML processing is limited for security reasons, it will be reported via a call to the registered ErrorHandler.fatalError(SAXParseException exception). See SchemaFactory.setErrorHandler(ErrorHandler errorHandler).
• false: the implementation will processing XML according to the XML specifications without regard to possible implementation limits.

Overrides:

setFeature in class SchemaFactory

Parameters:

name - The feature name, which is a non-null fully-qualified URI.

value - The requested value of the feature (true or false).

Throws:

SAXNotRecognizedException - If the feature value can't be assigned or retrieved.

SAXNotSupportedException - When the SchemaFactory recognizes the feature name but cannot set the requested value.

See Also:

SchemaFactory.getFeature(String)

setProperty

public void setProperty(java.lang.String name,
                        java.lang.Object object)
                 throws SAXNotRecognizedException,
                        SAXNotSupportedException

Description copied from class: SchemaFactory

Set the value of a property.

The property name is any fully-qualified URI. It is possible for a SchemaFactory to recognize a property name but to be unable to change the current value.

SchemaFactorys are not required to recognize setting any specific property names.

Overrides:

setProperty in class SchemaFactory

Parameters:

name - The property name, which is a non-null fully-qualified URI.

object - The requested value for the property.

Throws:

SAXNotRecognizedException - If the property value can't be assigned or retrieved.

SAXNotSupportedException - When the SchemaFactory recognizes the property name but cannot set the requested value.