net.sf.saxon.functions

Class ResolveURI

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.ResolveURI

All Implemented Interfaces:

PullEvent, Callable, Function, GroundedValue, Item, Sequence

public class ResolveURI
extends SystemFunction

This class supports the resolve-uri() function in XPath 2.0

Constructor Summary

Constructors

Constructor and Description
ResolveURI()

Method Summary

Methods

Modifier and Type	Method and Description
ZeroOrOne<AnyURIValue>	call(XPathContext context, Sequence[] arguments) Evaluate the expression
static String	escapeSpaces(String s) Replace spaces by %20
static URI	makeAbsolute(String relativeURI, String base) Construct an absolute URI from a relative URI and a base URI.
static String	tryToExpand(String systemId) If a system ID can't be parsed as a URL, try to expand it as a relative URI using the current directory as the base URI.
static String	unescapeSpaces(String uri) Replace %20 by space

Methods inherited from class net.sf.saxon.functions.SystemFunction

equals, export, exportAttributes, getArity, getCardinality, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getExpressionCompiler, getFunctionItemType, getFunctionName, getIntegerBounds, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamingAdjunct, importAttributes, makeCall, makeFunction, makeFunctionCall, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, typeCheckCaller

Methods inherited from class net.sf.saxon.functions.AbstractFunction

atomize, deepEquals, effectiveBooleanValue, getStringValue, getStringValueCS, isArray, isMap, optimize, simplify, typeCheck

Methods inherited from class net.sf.saxon.om.AbstractItem

getLength, head, itemAt, iterate, reduce, subsequence

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.om.Function

iterate

Methods inherited from interface net.sf.saxon.om.Item

head

Methods inherited from interface net.sf.saxon.om.GroundedValue

getLength, head, itemAt, reduce, subsequence

Constructor Detail

ResolveURI

public ResolveURI()

Method Detail

call

public ZeroOrOne<AnyURIValue> call(XPathContext context,
                          Sequence[] arguments)
                            throws XPathException

Evaluate the expression

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as SequenceIterators

Returns:

the result of the evaluation, in the form of a SequenceIterator

Throws:

XPathException - if a dynamic error occurs during the evaluation of the expression

tryToExpand

public static String tryToExpand(String systemId)

If a system ID can't be parsed as a URL, try to expand it as a relative URI using the current directory as the base URI.

Parameters:

systemId - the supplied systemId. Null is treated as equivalent to ""

Returns:

the systemId itself if it is a valid URL; otherwise the result of resolving the systemId as a relative file name in the current working directory; or if the current working directory is not available (e.g. in an applet) the supplied systemId unchanged (except that null is treated as "").

makeAbsolute

public static URI makeAbsolute(String relativeURI,
               String base)
                        throws URISyntaxException

Construct an absolute URI from a relative URI and a base URI. The method uses the resolve method of the java.net.URI class, except where the base URI uses the (non-standard) "jar:" scheme, in which case the method used is new URL(baseURL, relativeURL).

Spaces in either URI are converted to %20

If no base URI is available, and the relative URI is not an absolute URI, then the current directory is used as a base URI.

Parameters:

relativeURI - the relative URI. Null is permitted provided that the base URI is an absolute URI

base - the base URI. Null is permitted provided that relativeURI is an absolute URI

Returns:

the absolutized URI

Throws:

URISyntaxException - if either of the strings is not a valid URI or if the resolution fails

escapeSpaces

public static String escapeSpaces(String s)

Replace spaces by %20

Parameters:

s - the input string

Returns:

the input string with each space replaced by %20

unescapeSpaces

public static String unescapeSpaces(String uri)

Replace %20 by space

Parameters:

uri - the input uri

Returns:

the input URI with each %20 replaced by space