Package com.adobe.xmp.schema.service

Interface SchemaService

public interface SchemaService

Interface for a service to provide schema information for XMP schemas and properties. A simple property path of QNames, '/' separators and array indices '[xxx]' can be used to determine a properties type.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	SchemaService.INamespaceCallback	An interface to report prefix/namespace bindings during Relax NG parsing.

Method Summary

Modifier and Type	Method	Description
PropertyDescription	getProperty(XMPPath propertyPath)	Retrieves the property description for all kinds of properties for a given XMP path.
SchemaDescription	getSchemaForURI(String ns)	Request the schema information for a namespace.
PropertyType	getType(XMPPath propertyPath)	Provides the type information for a single property (simple, array (and item type), struct or qualifier) for a given XMP path.
SchemaDescription	parseRelaxNG(InputStream input, SchemaService.INamespaceCallback namespaceCallback)	Parses a RelaxNG file from the inputstream and reports namespaces with corresponding prefixes to the callback interface.

Method Details

getSchemaForURI

SchemaDescription getSchemaForURI(String ns)
                           throws SchemaServiceException

Request the schema information for a namespace.

Parameters:

ns - a namespace URI, e.g. "http://purl.org/dc/elements/1.1/" for Dublin Core

Returns:

Returns a SchemaDescription or null if it is not available.

Throws:

SchemaServiceException - Forwards exceptions that occur during schema file loading and parsing.

getType

PropertyType getType(XMPPath propertyPath)
              throws SchemaServiceException

Provides the type information for a single property (simple, array (and item type), struct or qualifier) for a given XMP path. Note: Qualifiers are currently not supported. The prefixes used in the property paths are resolved using the NamespaceUtil.

Examples:

• dc:Rating -- a simple property type
• exif:Flash/exif:Fired -- a "struct" containing a simple "boolean" property
• dc:subject -- an "Alt-array" with item type "Text"
• dc:subject[3] -- the item type of the array, which is "Text". Note The array index is ignored and can also be left out "[]"

Parameters:

propertyPath - XMPPath which identifies the property

Returns:

Returns the property type for the requested property, or null if the property is not part of the schema and no type information is available. An exception is thrown, if the path is syntactically not correct. null is returned if path is not accessible (e.g. child property of a simple property).

Throws:

SchemaServiceException - Reports errors during the retrieval of schema or type information.

getProperty

PropertyDescription getProperty(XMPPath propertyPath)
                         throws SchemaServiceException

Retrieves the property description for all kinds of properties for a given XMP path. Note: Qualifiers are currently not supported.

Parameters:

propertyPath - XMPPath which identifies the property

Returns:

Returns the property description for the requested property, or null if the property is not part of the schema and no type information is available. An exception is thrown, if the path is syntactically not correct. null is returned if path is not accessible (e.g. child property of a simple property).

Throws:

SchemaServiceException - Reports errors during the retrieval of schema or type information.

parseRelaxNG

SchemaDescription parseRelaxNG(InputStream input,
 SchemaService.INamespaceCallback namespaceCallback)
                        throws SchemaServiceException

Parses a RelaxNG file from the inputstream and reports namespaces with corresponding prefixes to the callback interface.

Parameters:

input - a RelaxNG file

namespaceCallback - a callback function to report the namespaces found during parsing

Returns:

Returns a SchemaDescription

Throws:

SchemaServiceException - Reports errors during the retrieval of schema or type information.