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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.Assignation
net.sf.saxon.expr.ForExpression
public class ForExpression
A ForExpression maps an expression over a sequence. This version works with range variables, it doesn't change the context information
Field Summary |
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Fields inherited from class net.sf.saxon.expr.Assignation |
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action, declaration, sequence, slotNumber, variableName |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
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lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
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ForExpression()
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Method Summary | |
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Expression |
analyze(StaticContext env)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality of the expression |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure |
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 |
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 |
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evaluateVariable, getRequiredType, getSubExpressions, getVariableName, promote, setSequence, setSlotNumber, setVariableDeclaration, simplify |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
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computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, markTailFunctionCalls, setLineNumber, typeError |
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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public ForExpression()
Method Detail |
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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) throws XPathException
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)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 ItemType getItemType()
public int computeCardinality()
computeCardinality
in class ComputedExpression
public void display(int level, NamePool pool)
level
- indentation level for this expression
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