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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.instruct.NumberInstruction
public class 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 |
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Fields inherited from class net.sf.saxon.expr.Expression |
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EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
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()
Compute the static cardinality of this expression |
Expression |
copy()
Copy an expression. |
Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item. |
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)
Determine the data type of the expression, if possible. |
Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
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)
Simplify an expression. |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public 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)
config
- the Saxon configurationselect
- the expression supplied in the select attributelevel
- one of "single", "level", "multi"count
- the pattern supplied in the count attributefrom
- the pattern supplied in the from attributevalue
- the expression supplied in the value attributeformat
- the expression supplied in the format attributegroupSize
- the expression supplied in the group-size attributegroupSeparator
- the expression supplied in the grouping-separator attributeletterValue
- the expression supplied in the letter-value attributeordinal
- the expression supplied in the ordinal attributelang
- the expression supplied in the lang attributeformatter
- A NumberFormatter to be usednumberer
- A Numberer to be used for localizationhasVariablesInPatterns
- true if one or more of the patterns contains variable referencesbackwardsCompatible
- true if running in 1.0 compatibility modeMethod Detail |
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public Expression simplify(ExpressionVisitor visitor) throws XPathException
Expression
simplify
in class Expression
visitor
- an expression visitor
XPathException
- if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType 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.
typeCheck
in class Expression
visitor
- an expression visitorcontextItemType
- 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
- if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
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.
optimize
in class Expression
visitor
- an expression visitorcontextItemType
- 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
- if an error is discovered during this phase
(typically a type error)public Iterator<Expression> iterateSubExpressions()
iterateSubExpressions
in class Expression
public Expression copy()
copy
in class Expression
public boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in class Expression
original
- the original subexpressionreplacement
- the replacement subexpression
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class Expression
public ItemType getItemType(TypeHierarchy th)
Expression
This method should always return a result, though it may be the best approximation that is available at the time.
getItemType
in class Expression
th
- the type hierarchy cache
public int computeCardinality()
Expression
computeCardinality
in class Expression
StaticProperty.ALLOWS_ZERO_OR_ONE
,
StaticProperty.EXACTLY_ONE
, StaticProperty.ALLOWS_ONE_OR_MORE
,
StaticProperty.ALLOWS_ZERO_OR_MORE
public Expression promote(PromotionOffer offer, Expression parent) throws XPathException
promote
in class Expression
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 expressionparent
- the containing expression in the expression tree
XPathException
- if any error is detectedpublic Item evaluateItem(XPathContext context) throws XPathException
Expression
evaluateItem
in class Expression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void explain(ExpressionPresenter out)
explain
in class Expression
out
- the expression presenter used to display the structure
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