net.sf.saxon.pattern

Class PatternWithPredicate

java.lang.Object

net.sf.saxon.pattern.Pattern

net.sf.saxon.pattern.PatternWithPredicate

All Implemented Interfaces:

java.io.Serializable, javax.xml.transform.SourceLocator, Container, PatternFinder

public class PatternWithPredicate
extends Pattern

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PatternWithPredicate(Pattern basePattern, Expression predicate)

Method Summary

Modifier and Type	Method and Description
Pattern	analyze(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) Type-check the pattern.
double	getDefaultPriority() Determine the default priority to use if this pattern appears as a match pattern for a template with no explicit priority attribute.
ItemType	getItemType() Get an ItemType that all the items matching this pattern must satisfy
java.util.Iterator	iterateSubExpressions() Iterate over the subexpressions within this pattern
boolean	matches(Item item, XPathContext context) Determine whether this Pattern matches the given Node.

Methods inherited from class net.sf.saxon.pattern.Pattern

allocateSlots, getColumnNumber, getContainerGranularity, getDependencies, getExecutable, getFingerprint, getHostLanguage, getLineNumber, getLocationProvider, getNodeKind, getPublicId, getSystemId, internalMatches, make, matchesBeneathAnchor, promote, replaceSubExpression, resolveCurrent, selectNodes, setExecutable, setLineNumber, setOriginalText, setSystemId, setVariableBindingExpression, simplify, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PatternWithPredicate

public PatternWithPredicate(Pattern basePattern,
                            Expression predicate)

Method Detail

matches

public boolean matches(Item item,
                       XPathContext context)
                throws XPathException

Determine whether this Pattern matches the given Node. This is the main external interface for matching patterns: it sets current() to the node being tested

Specified by:

matches in class Pattern

Parameters:

item - The NodeInfo representing the Element or other node to be tested against the Pattern

context - The dynamic context. Only relevant if the pattern uses variables, or contains calls on functions such as document() or key().

Returns:

true if the node matches the Pattern, false otherwise

Throws:

XPathException - if a dynamic error occurs during pattern matching

getItemType

public ItemType getItemType()

Get an ItemType that all the items matching this pattern must satisfy

Specified by:

getItemType in class Pattern

Returns:

an ItemType, as specific as possible, which all the matching items satisfy

iterateSubExpressions

public java.util.Iterator iterateSubExpressions()

Iterate over the subexpressions within this pattern

Overrides:

iterateSubExpressions in class Pattern

Returns:

an iterator over the subexpressions. Default implementation returns an empty sequence

analyze

public Pattern analyze(ExpressionVisitor visitor,
                       ExpressionVisitor.ContextItemType contextItemType)
                throws XPathException

Type-check the pattern.

Overrides:

analyze in class Pattern

Parameters:

visitor - the expression visitor

contextItemType - the type of the context item at the point where the pattern is defined. Set to null if it is known that the context item is undefined.

Returns:

the optimised Pattern

Throws:

XPathException - if a static error is discovered

getDefaultPriority

public double getDefaultPriority()

Determine the default priority to use if this pattern appears as a match pattern for a template with no explicit priority attribute.

Overrides:

getDefaultPriority in class Pattern

Returns:

the default priority for the pattern