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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.SuppliedParameterReference
Supplied parameter reference: this is an internal expression used to refer to the value of the n'th parameter supplied on a template call (apply-templates). It is used within a type-checking expression designed to check the consistency of the supplied value with the required type. This type checking is all done at run-time, because the binding of apply-templates to actual template rules is entirely dynamic.
Field Summary |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
SuppliedParameterReference(int slot)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression. |
int |
computeCardinality()
Get the static cardinality |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
boolean |
equals(java.lang.Object other)
Test if this expression is the same as another expression. |
Item |
evaluateItem(XPathContext c)
Evaluate an expression as a single item. |
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
SequenceIterator |
iterate(XPathContext c)
Get the value of this expression in a given context. |
Expression |
simplify(StaticContext env)
Simplify the expression. |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public SuppliedParameterReference(int slot)
slot
- identifies this parameterMethod Detail |
public Expression simplify(StaticContext env)
simplify
in interface Expression
simplify
in class ComputedExpression
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
env
- the static context of the expressioncontextItemType
- 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
public ItemType getItemType()
public int computeCardinality()
computeCardinality
in class ComputedExpression
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
c
- the XPathContext which contains the relevant variable bindings
XPathException
- if the variable is undefinedpublic Item evaluateItem(XPathContext c) throws XPathException
ComputedExpression
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
c
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void display(int level, NamePool pool, java.io.PrintStream out)
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination
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