org.opengis.cite.cat30.util

Class ValidationUtils

java.lang.Object

org.opengis.cite.cat30.util.ValidationUtils

public class ValidationUtils
extends Object

A utility class that provides convenience methods to support schema validation.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static String	FACTORY_RELAXNG_COMPACT
(package private) static String	ROOT_PKG

Constructor Summary

Constructors

Constructor and Description
ValidationUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static org.opengis.cite.validation.SchematronValidator	buildSchematronValidator(String schemaRef, String phase) Constructs a SchematronValidator that will check an XML resource against the rules defined in a Schematron schema.
static Schema	createAtomSchema() Creates a Schema object representing the constraints defined in RFC 4287 ("The Atom Syndication Format").
static Schema	createCSWSchema() Creates a Schema object representing the complete set of constraints defined in the CSW 3.0 schema.
static LSResourceResolver	createSchemaResolver(URI schemaLanguage) Creates a resource resolver suitable for locating schemas using an entity catalog.
static Set<URI>	extractSchemaReferences(Source source, String baseURI) Extracts a set of XML Schema references from a source XML document.

Methods inherited from class java.lang.Object

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

Field Detail

ROOT_PKG

static final String ROOT_PKG

See Also:

Constant Field Values

FACTORY_RELAXNG_COMPACT

static final String FACTORY_RELAXNG_COMPACT

See Also:

Constant Field Values

Constructor Detail

ValidationUtils

public ValidationUtils()

Method Detail

createSchemaResolver

public static LSResourceResolver createSchemaResolver(URI schemaLanguage)

Creates a resource resolver suitable for locating schemas using an entity catalog. In effect, local copies of standard schemas are returned instead of retrieving them from external repositories.

Parameters:

schemaLanguage - A URI that identifies a schema language by namespace name.

Returns:

A LSResourceResolver object that is configured to use an OASIS entity catalog.

buildSchematronValidator

public static org.opengis.cite.validation.SchematronValidator buildSchematronValidator(String schemaRef,
                                                                       String phase)

Constructs a SchematronValidator that will check an XML resource against the rules defined in a Schematron schema. An attempt is made to resolve the schema reference using an entity catalog; if this fails the reference is used as given.

Parameters:

schemaRef - A reference to a Schematron schema; this is expected to be a relative or absolute URI value, possibly matching the system identifier for some entry in an entity catalog.

phase - The name of the phase to invoke.

Returns:

A SchematronValidator instance, or null if the validator cannot be constructed (e.g. invalid schema reference or phase name).

extractSchemaReferences

public static Set<URI> extractSchemaReferences(Source source,
                               String baseURI)
                                        throws XMLStreamException

Extracts a set of XML Schema references from a source XML document. The document element is expected to include the standard xsi:schemaLocation attribute.

Parameters:

source - The source instance to read from; its base URI (systemId) should be set.

baseURI - An alternative base URI to use if the source does not have a system identifier set or if its system id is a file URI. This will usually be the URI used to retrieve the resource; it may be null.

Returns:

A Set containing absolute URI references that specify the locations of XML Schema resources.

Throws:

XMLStreamException - If an error occurs while reading the source instance.

createCSWSchema

public static Schema createCSWSchema()

Creates a Schema object representing the complete set of constraints defined in the CSW 3.0 schema. It incorporates schema components from all relevant namespaces.

Returns:

An immutable Schema object, or null if it cannot be constructed.

createAtomSchema

public static Schema createAtomSchema()

Creates a Schema object representing the constraints defined in RFC 4287 ("The Atom Syndication Format"). Appendix B provides an informative RELAX NG grammar (compact syntax); it can be used to validate either a feed or a stand-alone entry element.

Returns:

An immutable Schema object, or null if it cannot be constructed.

See Also:

RFC 4287, Appendix B