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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.FunctionCall net.sf.saxon.functions.SystemFunction net.sf.saxon.functions.Subsequence
public class Subsequence
Implements the XPath 2.0 subsequence() function
Field Summary |
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Fields inherited from class net.sf.saxon.functions.SystemFunction |
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operation |
Fields inherited from class net.sf.saxon.expr.FunctionCall |
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argument |
Fields inherited from class net.sf.saxon.expr.Expression |
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EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
Constructor Summary | |
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Subsequence()
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Method Summary | |
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SequenceIterator |
call(SequenceIterator[] arguments,
XPathContext context)
Evaluate the expression |
int |
computeCardinality()
Determine the cardinality of the function. |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items in the sequence |
SequenceIterator |
iterate(XPathContext context)
Evaluate the function to return an iteration of selected nodes. |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
static SequenceIterator |
subSequence(SequenceIterator seq,
NumericValue startVal,
NumericValue lengthVal,
XPathContext context)
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Methods inherited from class net.sf.saxon.functions.SystemFunction |
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addContextDocumentArgument, addDocToPathMap, checkArguments, copy, equals, getDetails, getErrorCodeForTypeErrors, getImplementationMethod, getOperation, getRequiredType, makeSystemFunction, setDetails, useContextItemAsDefault |
Methods inherited from class net.sf.saxon.expr.FunctionCall |
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addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheck |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface net.sf.saxon.expr.CallableExpression |
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getArguments |
Constructor Detail |
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public Subsequence()
Method Detail |
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public ItemType getItemType(TypeHierarchy th)
getItemType
in class SystemFunction
th
- the type hierarchy cache
public int computeSpecialProperties()
computeSpecialProperties
in class SystemFunction
public int computeCardinality()
computeCardinality
in class SystemFunction
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize
in class SystemFunction
visitor
- an expression visitorcontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
- if an error is discovered during this phase
(typically a type error)public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in class Expression
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator call(SequenceIterator[] arguments, XPathContext context) throws XPathException
CallableExpression
call
in interface CallableExpression
arguments
- the values of the arguments, supplied as SequenceIteratorscontext
- the dynamic evaluation context
XPathException
- if a dynamic error occurs during the evaluation of the expressionpublic static SequenceIterator subSequence(SequenceIterator seq, NumericValue startVal, NumericValue lengthVal, XPathContext context) throws XPathException
XPathException
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