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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.IfExpression
An IfExpression returns the value of either the "then" part or the "else" part, depending on the value of the condition
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 | |
IfExpression(Expression condition,
Expression thenExp,
Expression elseExp)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
void |
checkPermittedContents(SchemaType parentType,
StaticContext env,
boolean whole)
Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. |
int |
computeCardinality()
Determine the static cardinality of the result |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
Item |
evaluateItem(XPathContext context)
Evaluate the conditional expression in a given context |
Expression |
getCondition()
|
Expression |
getElseExpression()
|
ItemType |
getItemType()
Get data type of items in sequence returned by expression |
Expression |
getThenExpression()
|
SequenceIterator |
iterate(XPathContext context)
Iterate the path-expression in a given context |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
boolean |
markTailFunctionCalls()
Mark tail calls on used-defined functions. |
void |
process(XPathContext context)
Process this expression as an instruction, writing results to the current receiver |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
void |
setCondition(Expression exp)
|
void |
setThenExpression(Expression exp)
|
Expression |
simplify(StaticContext env)
Simplify an expression |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public IfExpression(Expression condition, Expression thenExp, Expression elseExp)
Method Detail |
public Expression getCondition()
public Expression getThenExpression()
public Expression getElseExpression()
public void setCondition(Expression exp)
public void setThenExpression(Expression exp)
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if an error is discovered during expression
rewritingpublic 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 Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expression
XPathException
- if any error is detectedpublic java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public boolean markTailFunctionCalls()
markTailFunctionCalls
in class ComputedExpression
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException
checkPermittedContents
in interface Expression
checkPermittedContents
in class ComputedExpression
XPathException
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- the evaluation context
XPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- the evaluation context
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 int computeSpecialProperties()
computeSpecialProperties
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 destination
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