Package net.sf.saxon.functions
Class Reverse
- 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.Reverse
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- All Implemented Interfaces:
Callable
,Function
,GroundedValue
,Item
,Sequence
public class Reverse extends SystemFunction
Implement XPath function fn:reverse()
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Constructor Summary
Constructors Constructor Description Reverse()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description Sequence
call(XPathContext context, Sequence[] arguments)
Invoke the functionstatic <T extends Item>
SequenceIteratorgetReverseIterator(SequenceIterator forwards)
int
getSpecialProperties(Expression[] arguments)
Determine the special properties of this function.java.lang.String
getStreamerName()
Get a name that identifies the class that can be used to evaluate this function in streaming mode, that is, supplying one item or event at a time as it is delivered by the parser.Expression
makeOptimizedFunctionCall(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments)
Allow the function to create an optimized call based on the values of the actual arguments-
Methods inherited from class net.sf.saxon.functions.SystemFunction
dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getCompilerName, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getStaticBaseUriString, importAttributes, isTrustedResultType, makeCall, makeFunction, makeFunctionCall, 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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getSpecialProperties
public int getSpecialProperties(Expression[] arguments)
Description copied from class:SystemFunction
Determine the special properties of this function. The general rule is that a system function call is non-creative unless more details are defined in a subclass.- Overrides:
getSpecialProperties
in classSystemFunction
- Parameters:
arguments
- the actual arguments supplied in a call to the function
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getReverseIterator
public static <T extends Item> SequenceIterator getReverseIterator(SequenceIterator forwards) throws XPathException
- Throws:
XPathException
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call
public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException
Description copied from interface:Function
Invoke the function- Parameters:
context
- the XPath dynamic evaluation contextarguments
- the actual arguments to be supplied- Returns:
- the result of invoking the function
- Throws:
XPathException
- if a dynamic error occurs within the function
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makeOptimizedFunctionCall
public Expression makeOptimizedFunctionCall(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments) throws XPathException
Allow the function to create an optimized call based on the values of the actual arguments- Overrides:
makeOptimizedFunctionCall
in classSystemFunction
- Parameters:
visitor
- the expression visitorcontextInfo
- information about the context itemarguments
- the supplied arguments to the function call. Note: modifying the contents of this array should not be attempted, it is likely to have no effect.- Returns:
- either a function call on this function, or an expression that delivers the same result, or null indicating that no optimization has taken place
- Throws:
XPathException
- if an error is detected
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getStreamerName
public java.lang.String getStreamerName()
Description copied from class:SystemFunction
Get a name that identifies the class that can be used to evaluate this function in streaming mode, that is, supplying one item or event at a time as it is delivered by the parser. Special streaming support is generally available in Saxon-EE for all system functions that take a sequence as their argument.- Overrides:
getStreamerName
in classSystemFunction
- Returns:
- a name that identifies a class that supports streamed evaluation of this system
function, or null if no such class is available. The mapping of names to classes is
defined in the Saxon-EE class
StreamerMap
. In non-streaming Saxon editions (HE and PE) the method always returns null.
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