Package net.sf.saxon.functions.hof
Class FunctionLookup
- java.lang.Object
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- net.sf.saxon.functions.AbstractFunction
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- net.sf.saxon.functions.SystemFunction
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- net.sf.saxon.functions.ContextAccessorFunction
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- net.sf.saxon.functions.hof.FunctionLookup
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- All Implemented Interfaces:
Callable,Function,GroundedValue,Item,Sequence
public class FunctionLookup extends ContextAccessorFunction
This class supports the function-lookup() function in XPath 3.0. It takes as arguments a function name (QName) and arity, and returns a function item representing that function if found, or an empty sequence if not found.
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Constructor Summary
Constructors Constructor Description FunctionLookup()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description FunctionbindContext(XPathContext context)Bind a context item to appear as part of the function's closure.ZeroOrOnecall(XPathContext context, Sequence[] arguments)Evaluate the expressionbooleanequals(java.lang.Object o)Determine whether two expressions are equivalentFunctionlookup(StructuredQName name, int arity, XPathContext context)ExpressionmakeFunctionCall(Expression... arguments)Make an expression that either calls this function, or that is equivalent to a call on this function-
Methods inherited from class net.sf.saxon.functions.SystemFunction
dependsOnContextItem, dynamicCall, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getCompilerName, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, importAttributes, isTrustedResultType, makeCall, makeFunction, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCaller
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Methods inherited from class net.sf.saxon.functions.AbstractFunction
atomize, deepEquals, effectiveBooleanValue, getAnnotations, getStringValue, getStringValueCS, isArray, isMap, makeNewContext, simplify, typeCheck
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Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface net.sf.saxon.om.GroundedValue
asIterable, concatenate, containsNode, materialize
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Methods inherited from interface net.sf.saxon.om.Item
getLength, head, isStreamed, itemAt, iterate, reduce, subsequence
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Methods inherited from interface net.sf.saxon.om.Sequence
makeRepeatable
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Method Detail
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makeFunctionCall
public Expression makeFunctionCall(Expression... arguments)
Description copied from class:SystemFunctionMake an expression that either calls this function, or that is equivalent to a call on this function- Overrides:
makeFunctionCallin classSystemFunction- Parameters:
arguments- the supplied arguments to the function call- Returns:
- either a function call on this function, or an expression that delivers the same result
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equals
public boolean equals(java.lang.Object o)
Determine whether two expressions are equivalent- Overrides:
equalsin classSystemFunction
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bindContext
public Function bindContext(XPathContext context)
Bind a context item to appear as part of the function's closure. If this method has been called, the supplied context item will be used in preference to the context item at the point where the function is actually called.- Specified by:
bindContextin classContextAccessorFunction- Parameters:
context- the context to which the function applies. Must not be null.
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lookup
public Function lookup(StructuredQName name, int arity, XPathContext context) throws XPathException
- Throws:
XPathException
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call
public ZeroOrOne call(XPathContext context, Sequence[] arguments) throws XPathException
Evaluate the expression- Specified by:
callin interfaceCallable- Specified by:
callin interfaceFunction- Overrides:
callin classContextAccessorFunction- Parameters:
context- the dynamic evaluation contextarguments- 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
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