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java.lang.Object net.sf.saxon.lib.ExtensionFunctionCall com.saxonica.functions.extfn.Evaluate.EvaluateCall
protected static class Evaluate.EvaluateCall
Constructor Summary | |
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protected |
Evaluate.EvaluateCall()
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Method Summary | |
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SequenceIterator |
call(SequenceIterator[] arguments,
XPathContext context)
Evaluate this function call at run-time |
void |
copyLocalData(ExtensionFunctionCall destination)
Copy local data from one copy of the function to another. |
protected Executable |
obtainExecutable(StaticContext env)
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protected Evaluate.PreparedExpression |
prepareExpression(String exprText,
NodeInfo namespaceOrigin,
String functionName,
XPathContext context)
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void |
supplyStaticContext(StaticContext env,
int locationId,
Expression[] arguments)
Supply static context information. |
Methods inherited from class net.sf.saxon.lib.ExtensionFunctionCall |
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effectiveBooleanValue, getContainer, getDefinition, getExecutable, rewrite, setDefinition |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected Evaluate.EvaluateCall()
Method Detail |
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public void supplyStaticContext(StaticContext env, int locationId, Expression[] arguments) throws XPathException
This method is called during compilation to provide information about the static context in which the function call appears. If the implementation of the function needs information from the static context, then it should save it now, as it will not be available later at run-time.
The implementation also has the opportunity to examine the expressions that appear in the arguments to the function call at this stage. These might already have been modified from the original expressions as written by the user. The implementation should not modify any of these expressions.
The default implementation of this method does nothing.
supplyStaticContext
in class ExtensionFunctionCall
env
- The static context in which the function call appears. The method must not modify
the static context.locationId
- An integer code representing the location of the call to the extension function
in the stylesheet; can be used in conjunction with the locationMap held in the static context for diagnosticsarguments
- The XPath expressions supplied in the call to this function. The method must not
modify this array, or any of the expressions contained in the array. @throws net.sf.saxon.trans.XPathException
if the implementation is able to detect a static error in the way the
function is being called (for example it might require that the types of the arguments are
consistent with each other).
XPathException
- if the implementation is able to detect a static error in the way the
function is being called (for example it might require that the types of the arguments are
consistent with each other).protected Executable obtainExecutable(StaticContext env)
public void copyLocalData(ExtensionFunctionCall destination)
copyLocalData
in class ExtensionFunctionCall
destination
- the function to which the local data must be copied. This will always
be an instance of the same function class as the source function.protected Evaluate.PreparedExpression prepareExpression(String exprText, NodeInfo namespaceOrigin, String functionName, XPathContext context) throws XPathException
XPathException
public SequenceIterator call(SequenceIterator[] arguments, XPathContext context) throws XPathException
call
in class ExtensionFunctionCall
arguments
- The values of the arguments to the function call. Each argument value (which is in general
a sequence) is supplied in the form of an iterator over the items in the sequence. If required, the
supplied sequence can be materialized by calling, for example, new SequenceExtent(arguments[i])
.
If the argument is always a singleton, then the single item may be obtained by calling
arguments[i].next()
. The implementation is not obliged to read all the items in each
SequenceIterator
if they are not required to compute the result; but if any SequenceIterator is not read
to completion, it is good practice to call its close() method.context
- The XPath dynamic evaluation context
SingletonIterator
. If the result is an empty sequence,
the method should return EmptyIterator.getInstance()
XPathException
- if a dynamic error occurs during evaluation of the function. The Saxon run-time
code will add information about the error location.
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