net.sf.saxon.pattern
public final class LocationPathPattern extends Pattern
Field Summary | |
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Pattern | ancestorPattern |
protected Expression | equivalentExpr |
protected Expression[] | filters |
protected boolean | firstElementPattern |
protected boolean | lastElementPattern |
NodeTest | nodeTest |
protected int | numberOfFilters |
Pattern | parentPattern |
protected boolean | specialFilter |
Method Summary | |
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void | addFilter(Expression filter)
Add a filter to the pattern (while under construction) |
Pattern | analyze(StaticContext env, ItemType contextItemType)
Type-check the pattern, performing any type-dependent optimizations. |
int | getDependencies()
Get the dependencies of the pattern. |
int | getFingerprint()
Determine the fingerprint of nodes to which this pattern applies.
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int | getNodeKind()
Determine the types of nodes to which this pattern applies. |
NodeTest | getNodeTest()
Get a NodeTest that all the nodes matching this pattern must satisfy |
protected boolean | internalMatches(NodeInfo node, XPathContext context)
Test whether the pattern matches, but without changing the current() node |
Iterator | iterateSubExpressions()
Iterate over the subexpressions within this pattern |
boolean | matches(NodeInfo node, XPathContext context)
Determine whether the pattern matches a given node. |
void | promote(PromotionOffer offer)
Offer promotion for subexpressions within this pattern. |
void | resolveCurrent(LetExpression let, PromotionOffer offer)
If the pattern contains any calls on current(), this method is called to modify such calls
to become variable references to a variable declared in a specially-allocated local variable |
Pattern | simplify(StaticContext env)
Simplify the pattern: perform any context-independent optimisations |
Parameters: filter The predicate (a boolean expression or numeric expression) to be added
Returns: the optimised Pattern
Returns: the fingerprint of nodes matched by this pattern.
Returns: the type of node matched by this pattern. e.g. Node.ELEMENT or Node.TEXT
Parameters: node the node to be tested
Returns: true if the pattern matches, else false
Unlike the corresponding method on Expression, this method does not return anything: it can make internal changes to the pattern, but cannot return a different pattern. Only certain kinds of promotion are applicable within a pattern: specifically, promotions affecting local variable references within the pattern.
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
Throws: net.sf.saxon.trans.XPathException if any error is detected
Parameters: let the expression that assigns the local variable. This returns a dummy result, and is executed just before evaluating the pattern, to get the value of the context item into the variable. offer A PromotionOffer used to process the expressions and change the call on current() into a variable reference
Throws: XPathException