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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.Assignation | +--net.sf.saxon.expr.ForExpression
A ForExpression maps an expression over a sequence. This version works with range variables, it doesn't change the context information
Field Summary |
Fields inherited from class net.sf.saxon.expr.Assignation |
action, declaration, nameCode, sequence, slotNumber, variableName |
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 | |
ForExpression()
|
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality of the expression |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
protected int |
getConstructType()
Get the type of this expression for use in tracing and diagnostics |
ItemType |
getItemType()
Determine the data type of the items returned by the expression, if possible |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
void |
process(XPathContext context)
Process this expression as an instruction, writing results to the current outputter |
void |
setAction(Expression action)
Add the "return" or "satisfies" expression, and fix up all references to the range variable that occur within that expression |
void |
setPositionVariable(RangeVariableDeclaration decl)
Set the reference to the position variable (XQuery only) |
Methods inherited from class net.sf.saxon.expr.Assignation |
evaluateVariable, getVariableFingerprint, getVariableName, getVariableNameCode, iterateSubExpressions, promote, setSequence, setSlotNumber, setVariableDeclaration, simplify |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ForExpression()
Method Detail |
public void setPositionVariable(RangeVariableDeclaration decl)
public void setAction(Expression action)
Assignation
setAction
in class Assignation
action
- the expression that occurs after the "return" keyword of a "for"
expression, the "satisfies" keyword of "some/every", or the ":=" operator of
a "let" expression.
This method must be called after calling setVariableDeclaration()
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 SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void process(XPathContext context) throws XPathException
process
in interface Expression
process
in class ComputedExpression
context
- The dynamic context, giving access to the current node,
the current variables, etc.
XPathException
public ItemType getItemType()
public int computeCardinality()
computeCardinality
in class ComputedExpression
public 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 destinationprotected int getConstructType()
getConstructType
in class ComputedExpression
Location
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