net.sf.saxon.pattern

Class UnionPattern

java.lang.Object

net.sf.saxon.pattern.Pattern

net.sf.saxon.pattern.VennPattern

net.sf.saxon.pattern.UnionPattern

All Implemented Interfaces:

Serializable, SourceLocator, Container, PatternFinder

public class UnionPattern
extends VennPattern

A pattern formed as the union (or) of two other patterns

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.pattern.VennPattern

p1, p2

Constructor Summary

Constructors

Constructor and Description
UnionPattern(Pattern p1, Pattern p2) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object other) Determine whether this pattern is the same as another pattern
ItemType	getItemType() Get an ItemType that all the items matching this pattern must satisfy
int	hashCode() Hashcode supporting equals()
boolean	matches(Item item, XPathContext context) Determine if the supplied node matches the pattern
boolean	matchesBeneathAnchor(NodeInfo node, NodeInfo anchor, XPathContext context) Determine whether this pattern matches a given Node within the subtree rooted at a given anchor node.

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

allocateSlots, analyze, bindCurrent, gatherComponentPatterns, getDependencies, getLHS, getNodeKind, getRHS, isMotionless, iterateSubExpressions, promote, replaceSubExpression, setExecutable, setLineNumber, setOriginalText, setSystemId, simplify

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

getColumnNumber, getContainerGranularity, getDefaultPriority, getExecutable, getFingerprint, getHostLanguage, getLineNumber, getLocationProvider, getPublicId, getSystemId, make, replaceCurrent, selectNodes, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UnionPattern

public UnionPattern(Pattern p1,
            Pattern p2)

Constructor

Parameters:

p1 - the left-hand operand

p2 - the right-hand operand

Method Detail

getItemType

public ItemType getItemType()

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

Overrides:

getItemType in class VennPattern

Returns:

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

matches

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

Determine if the supplied node matches the pattern

Specified by:

matches in class Pattern

Parameters:

item - the node to be compared

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 either of the operand patterns

Throws:

XPathException - if an error occurs while matching the pattern (the caller will usually treat this the same as a false result)

matchesBeneathAnchor

public boolean matchesBeneathAnchor(NodeInfo node,
                           NodeInfo anchor,
                           XPathContext context)
                             throws XPathException

Determine whether this pattern matches a given Node within the subtree rooted at a given anchor node. This method is used when the pattern is used for streaming.

Overrides:

matchesBeneathAnchor in class Pattern

Parameters:

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

anchor - The anchor node, which must match any AnchorPattern subpattern

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 an error occurs while matching the pattern (the caller will usually treat this the same as a false result)

equals

public boolean equals(Object other)

Determine whether this pattern is the same as another pattern

Overrides:

equals in class VennPattern

Parameters:

other - the other object

hashCode

public int hashCode()

Hashcode supporting equals()

Overrides:

hashCode in class VennPattern