net.sf.saxon
Interface RelativeURIResolver
- URIResolver
- DotNetURIResolver
public interface RelativeURIResolver
extends URIResolver
The standard JAXP URIResolver is given a relative URI and a base URI and returns the resource
identified by this combination. However, to support a stable implementation of the doc() function,
Saxon needs to know what the absolute URI is before the resource is fetched, so it can determine whether
a document with that absolute URI actually exists.
This extended interface defines a URIResolver that separates the two functions of resolving a relative URI
against a base URI, and fetching a resource with that absolute URI. If the URI resolver supplied to Saxon
implements this interface, the absolute URI associated with a loaded document will be the URI returned by
this resolver.
The particular motivation for providing this interface is to allow a URIResolver to wrap a .NET XmlResolver,
which has additional capability not present in the JAXP interface.
Source | dereference(String uri) - Called by the processor when it encounters
an xsl:include, xsl:import, or document() function.
|
String | makeAbsolute(String href, String base) - Create an absolute URI from a relative URI and a base URI.
|
Source | resolve(String href, String base) - Called by the processor when it encounters
an xsl:include, xsl:import, or document() function.
|
void | setExpectedMediaType(String mediaType) - Specify the media type of the resource that is expected to be delivered.
|
dereference
public Source dereference(String uri)
throws TransformerException
Called by the processor when it encounters
an xsl:include, xsl:import, or document() function.
uri
- The absolute URI to be dereferenced
- A Source object, or null if the href cannot be dereferenced,
and the processor should try to resolve the URI itself.
makeAbsolute
public String makeAbsolute(String href,
String base)
throws TransformerException
Create an absolute URI from a relative URI and a base URI. This method performs the
process which is correctly called "URI resolution": this is purely a syntactic operation
on the URI strings, and does not retrieve any resources.
href
- A relative or absolute URI, to be resolved against the specified base URIbase
- The base URI against which the first argument will be made
absolute if the absolute URI is required.
- A string containing the absolute URI that results from URI resolution. If the resource
needs to be fetched, this absolute URI will be supplied as the href parameter in a subsequent
call to the
resolve
method.
resolve
public Source resolve(String href,
String base)
throws TransformerException
Called by the processor when it encounters
an xsl:include, xsl:import, or document() function.
Despite the name, the main purpose of this method is to dereference the URI, not merely
to resolve it.
This method is provided because it is required by the interface. When using a RelativeURIResolver,
the single-argument dereference() method is preferred. The result of calling this method should be the
same as the result of calling
dereference(makeAbsolute(href, base))
href
- An href attribute, which may be relative or absolute.base
- The base URI against which the first argument will be made
absolute if the absolute URI is required.
- A Source object, or null if the href cannot be resolved,
and the processor should try to resolve the URI itself.
setExpectedMediaType
public void setExpectedMediaType(String mediaType)
Specify the media type of the resource that is expected to be delivered. This information is
supplied by the processor primarily to indicate whether the URIResolver is allowed to return
an XML tree already parsed. If the value is "text/plain" then the Source returned by the
resolve() method should be a StreamSource.
mediaType
- the expected media type