Package net.sf.saxon.lib

Class StandardModuleURIResolver

java.lang.Object

net.sf.saxon.lib.StandardModuleURIResolver

All Implemented Interfaces:

ModuleURIResolver

public class StandardModuleURIResolver
extends Object
implements ModuleURIResolver

This class is the standard ModuleURIResolver used to implement the "import module" declaration in a Query Prolog. It is used when no user-defined ModuleURIResolver has been specified, or when the user-defined ModuleURIResolver decides to delegate to the standard ModuleURIResolver. It relies on location hints being supplied in the "import module" declaration, and attempts to locate a module by dereferencing the URI given as the location hint. It accepts standard URIs recognized by the Java URL class, including the jar URI scheme; it also accepts classpath URIs as defined in the Spring framework.

Constructor Summary

Constructors

Constructor	Description
StandardModuleURIResolver()	Create a StandardModuleURIResolver.
StandardModuleURIResolver(Configuration config)	Create a StandardModuleURIResolver, with a supplied configuration

Method Summary

Modifier and Type	Method	Description
StreamSource[]	resolve(String moduleURI, String baseURI, String[] locations)	Resolve a module URI and associated location hints.
protected StreamSource	resolveLocationHint(String baseURI, String locationHint)	Resolve a location hint appearing in an "import module" declaration
protected StreamSource	resolveModuleURI(String moduleURI, String baseURI)	Attempt to resolve the module namespace URI without the help of location hints.
void	setConfiguration(Configuration config)	Set the Configuration that this resolver uses.

Methods inherited from class java.lang.Object

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

Constructor Details

StandardModuleURIResolver

public StandardModuleURIResolver()

Create a StandardModuleURIResolver. If this constructor is used, a configuration must be supplied in a subsequent call. The constructor is provided to allow instantiation from a Configuration file.

StandardModuleURIResolver

public StandardModuleURIResolver(Configuration config)

Create a StandardModuleURIResolver, with a supplied configuration

Parameters:

config - the Saxon Configuration object

Method Details

setConfiguration

public void setConfiguration(Configuration config)

Set the Configuration that this resolver uses. Has no effect if the configuration has already been supplied by the constructor.

Parameters:

config - the Saxon Configuration object

resolve

public StreamSource[] resolve(String moduleURI,
 String baseURI,
 String[] locations)
                       throws XPathException

Resolve a module URI and associated location hints.

The logic of this is as follows:

1. First, call the configuration-level ResourceResolver to resolve the module URI as a namespace (via the method resolveModuleURI, which can be overridden in a subclass).
2. If this returns null and there are no location hints, throw XQST0059.
3. Otherwise attempt to resolve each of the supplied location hints in turn, using first the configuration-level ResourceResolver and then the fallback DirectResourceResolver, via the method resolveLocationHint, which can be overridden in a subclass. Return an array containing any non-null results; if there are none, throw XQST0059.

Specified by:

resolve in interface ModuleURIResolver

Parameters:

moduleURI - The module namespace URI of the module to be imported; or null when loading a non-library module.

baseURI - The base URI of the module containing the "import module" declaration; null if no base URI is known

locations - The set of URIs specified in the "at" clause of "import module", which serve as location hints for the module

Returns:

an array of StreamSource objects each identifying the contents of a module to be imported. Each StreamSource must contain a non-null absolute System ID which will be used as the base URI of the imported module, and either an InputSource or a Reader representing the text of the module.

Throws:

XPathException - (error XQST0059) if the module cannot be located

resolveModuleURI

protected StreamSource resolveModuleURI(String moduleURI,
 String baseURI)

Attempt to resolve the module namespace URI without the help of location hints.

Parameters:

moduleURI - the namespace URI of the module being imported

baseURI - the base URI of the module containing the "import module" declaration

Returns:

a StreamSource delivering the contents of the module.

resolveLocationHint

protected StreamSource resolveLocationHint(String baseURI,
 String locationHint)
                                    throws XPathException

Resolve a location hint appearing in an "import module" declaration

Parameters:

baseURI - the base URI of the "import module" declaration

locationHint - the location hint, as written

Returns:

either a StreamSource representing the content of the module, or null

Throws:

XPathException - if the URI is invalid or can't be resolved (but not if the module simply doesn't exist at that location)