net.sf.saxon.instruct
public class NumberInstruction extends Expression
Constructor Summary | |
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NumberInstruction(Configuration config, 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, boolean backwardsCompatible)
Construct a NumberInstruction |
Method Summary | |
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int | computeCardinality() |
Expression | copy()
Copy an expression. |
Item | evaluateItem(XPathContext context) |
void | explain(ExpressionPresenter out)
Diagnostic print of expression structure. |
int | getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived
from the dependencies of its subexpressions. |
ItemType | getItemType(TypeHierarchy th) |
Iterator<Expression> | iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
Expression | optimize(ExpressionVisitor visitor, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression | promote(PromotionOffer offer, Expression parent)
Offer promotion for this subexpression. |
boolean | replaceSubExpression(Expression original, Expression replacement)
Replace one subexpression by a replacement subexpression |
Expression | simplify(ExpressionVisitor visitor) |
Expression | typeCheck(ExpressionVisitor visitor, ItemType contextItemType)
Perform static analysis of an expression and its subexpressions.
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Parameters: config the Saxon configuration select the expression supplied in the select attribute level one of "single", "level", "multi" count the pattern supplied in the count attribute from the pattern supplied in the from attribute value the expression supplied in the value attribute format the expression supplied in the format attribute groupSize the expression supplied in the group-size attribute groupSeparator the expression supplied in the grouping-separator attribute letterValue the expression supplied in the letter-value attribute ordinal the expression supplied in the ordinal attribute lang the expression supplied in the lang attribute formatter A NumberFormatter to be used numberer A Numberer to be used for localization hasVariablesInPatterns true if one or more of the patterns contains variable references backwardsCompatible true if running in 1.0 compatibility mode
Returns: the copy of the original expression
Returns: a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty
Returns: an iterator containing the sub-expressions of this expression
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
Parameters: visitor an expression visitor contextItemType 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 ITEM_TYPE
Returns: the original expression, rewritten if appropriate to optimize execution
Throws: XPathException if an error is discovered during this phase (typically a type error)
Parameters: 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 parent
Returns: if the offer is not accepted, return this expression unchanged. Otherwise return the result of rewriting the expression to promote this subexpression
Throws: net.sf.saxon.trans.XPathException if any error is detected
Parameters: original the original subexpression replacement the replacement subexpression
Returns: true if the original subexpression is found
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.
Parameters: visitor an expression visitor contextItemType 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 ITEM_TYPE
Returns: the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations
Throws: XPathException if an error is discovered during this phase (typically a type error)