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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.instruct.NumberInstruction
An xsl:number element in the stylesheet. Although this is an XSLT instruction, it is compiled
into an expression, evaluated using xsl:value-of to create the resulting text node.
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 | |
NumberInstruction(Expression select,
int level,
Pattern count,
Pattern from,
Expression value,
Expression format,
Expression groupSize,
Expression groupSeparator,
Expression letterValue,
Expression ordinal,
Expression lang,
NumberFormatter formatter,
Numberer numberer,
boolean hasVariablesInPatterns)
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Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
int |
computeCardinality()
|
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure. |
Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item. |
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
java.util.Iterator |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
static Numberer |
makeNumberer(java.lang.String language)
Load a Numberer class for a given language and check it is OK. |
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 NumberInstruction(Expression select, int level, Pattern count, Pattern from, Expression value, Expression format, Expression groupSize, Expression groupSeparator, Expression letterValue, Expression ordinal, Expression lang, NumberFormatter formatter, Numberer numberer, boolean hasVariablesInPatterns)
Method Detail |
public Expression simplify(StaticContext env) throws XPathException
ComputedExpression
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
This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables will only be accurately known if they have been explicitly declared.
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
StaticError
- if an error is discovered during this phase
(typically a type error)
XPathException
public java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public ItemType getItemType()
Expression
This method should always return a result, though it may be the best approximation that is available at the time.
public int computeCardinality()
computeCardinality
in class ComputedExpression
public Item evaluateItem(XPathContext context) throws XPathException
ComputedExpression
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic static Numberer makeNumberer(java.lang.String language)
language
- the language for which a Numberer is required
public void display(int level, NamePool pool, java.io.PrintStream out)
level
- indentation level for this expressionout
- pool
- NamePool used to expand any names appearing in the expression
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