net.sf.saxon.functions
Class ResolveURI

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.expr.FunctionCall
          net.sf.saxon.functions.SystemFunction
              net.sf.saxon.functions.ResolveURI

All Implemented Interfaces:

Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, SequenceIterable, InstructionInfo, Locator

public class ResolveURI
extends SystemFunction

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

See Also:

Serialized Form

Field Summary

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

operation

Fields inherited from class net.sf.saxon.expr.FunctionCall

argument

Fields inherited from class net.sf.saxon.expr.Expression

EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD

Constructor Summary

ResolveURI()

Method Summary

void	checkArguments(ExpressionVisitor visitor) Method called during static type checking
Expression	copy() Copy an expression.
static String	escapeSpaces(String s) Replace spaces by %20
Item	evaluateItem(XPathContext context) Evaluate the function at run-time
String	getStaticBaseURI() Get the static base URI of the expression
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.

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

addContextDocumentArgument, addDocToPathMap, computeCardinality, computeSpecialProperties, getDetails, getErrorCodeForTypeErrors, getImplementationMethod, getItemType, getRequiredType, makeSystemFunction, optimize, setDetails, useContextItemAsDefault

Methods inherited from class net.sf.saxon.expr.FunctionCall

addExternalFunctionCallToPathMap, checkArgumentCount, equals, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheck

Methods inherited from class net.sf.saxon.expr.Expression

addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, typeError

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ResolveURI

public ResolveURI()

Method Detail

checkArguments

public void checkArguments(ExpressionVisitor visitor)
                    throws XPathException

Description copied from class: SystemFunction

Method called during static type checking

Overrides:

checkArguments in class SystemFunction

Parameters:

visitor - the expression visitor

Throws:

XPathException

getStaticBaseURI

public String getStaticBaseURI()

Get the static base URI of the expression

copy

public Expression copy()

Copy an expression. This makes a deep copy.

Overrides:

copy in class SystemFunction

Returns:

the copy of the original expression

evaluateItem

public Item evaluateItem(XPathContext context)
                  throws XPathException

Evaluate the function at run-time

Specified by:

evaluateItem in interface EvaluableItem

Overrides:

evaluateItem in class Expression

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

Throws:

XPathException - if any dynamic error occurs evaluating 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.

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