Package net.sf.saxon.pattern
Class UnionPattern
java.lang.Object
net.sf.saxon.pattern.Pattern
net.sf.saxon.pattern.UnionPattern
- All Implemented Interfaces:
Serializable
,SourceLocator
,Container
,PatternFinder
A pattern formed as the union (or) of two other patterns
- See Also:
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Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionint
allocateSlots
(StaticContext env, SlotManager slotManager, int nextFree) Allocate slots to any variables used within the patternanalyze
(ExpressionVisitor visitor, ItemType contextItemType) Type-check the pattern.boolean
Determine whether this pattern is the same as another patternvoid
Gather the component (non-union) patterns of this union patternint
Get the dependencies of the pattern.getLHS()
Get the LHS of the unionint
Determine the types of nodes to which this pattern applies.Get a NodeTest that all the nodes matching this pattern must satisfygetRHS()
Get the RHS of the unionint
hashCode()
Hashcode supporting equals()Iterate over the subexpressions within this patternboolean
matches
(NodeInfo e, XPathContext context) Determine if the supplied node matches the patternvoid
promote
(PromotionOffer offer) Offer promotion for subexpressions within this pattern.boolean
replaceSubExpression
(Expression original, Expression replacement) Replace one subexpression by a replacement subexpressionvoid
setExecutable
(Executable executable) Set the executable containing this patternvoid
setLineNumber
(int lineNumber) Override method to set the system ID, so it's set on both halvesvoid
setOriginalText
(String pattern) Set the original textvoid
setSystemId
(String systemId) Override method to set the system ID, so it's set on both halvessimplify
(ExpressionVisitor visitor) Simplify the pattern: perform any context-independent optimisationsMethods inherited from class net.sf.saxon.pattern.Pattern
getColumnNumber, getDefaultPriority, getExecutable, getFingerprint, getHostLanguage, getLineNumber, getLocationProvider, getPublicId, getSystemId, internalMatches, make, makeSearchExpression, selectNodes, toString
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Field Details
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p1
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p2
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Constructor Details
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UnionPattern
Constructor- Parameters:
p1
- the left-hand operandp2
- the right-hand operand
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Method Details
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setExecutable
Set the executable containing this pattern- Overrides:
setExecutable
in classPattern
- Parameters:
executable
- the executable
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simplify
Simplify the pattern: perform any context-independent optimisations- Overrides:
simplify
in classPattern
- Parameters:
visitor
- an expression visitor- Returns:
- the optimised Pattern
- Throws:
XPathException
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analyze
Type-check the pattern. This is only needed for patterns that contain variable references or function calls.- Overrides:
analyze
in classPattern
- Parameters:
visitor
- the expression visitorcontextItemType
- the type of the context item, if known, at the point where the pattern is defined- Returns:
- the optimised Pattern
- Throws:
XPathException
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setOriginalText
Set the original text- Overrides:
setOriginalText
in classPattern
- Parameters:
pattern
- the original text of the pattern
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promote
Description copied from class:Pattern
Offer promotion for subexpressions within this pattern. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.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.- Overrides:
promote
in classPattern
- 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:
XPathException
- if any error is detected
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replaceSubExpression
Description copied from interface:Container
Replace one subexpression by a replacement subexpression- Specified by:
replaceSubExpression
in interfaceContainer
- Overrides:
replaceSubExpression
in classPattern
- Parameters:
original
- the original subexpressionreplacement
- the replacement subexpression- Returns:
- true if the original subexpression was found
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allocateSlots
Allocate slots to any variables used within the pattern- Overrides:
allocateSlots
in classPattern
- Parameters:
env
- the static context in the XSLT stylesheetslotManager
-nextFree
- the next slot that is free to be allocated @return the next slot that is free to be allocated
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gatherComponentPatterns
Gather the component (non-union) patterns of this union pattern- Parameters:
set
- the set into which the components will be added
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matches
Determine if the supplied node matches the pattern- Specified by:
matches
in classPattern
- Parameters:
e
- the node to be comparedcontext
- 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
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getNodeKind
public int getNodeKind()Determine the types of nodes to which this pattern applies. Used for optimisation. For patterns that match nodes of several types, return Node.NODE- Overrides:
getNodeKind
in classPattern
- Returns:
- the type of node matched by this pattern. e.g. Node.ELEMENT or Node.TEXT
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getNodeTest
Get a NodeTest that all the nodes matching this pattern must satisfy- Specified by:
getNodeTest
in classPattern
- Returns:
- a NodeTest, as specific as possible, which all the matching nodes satisfy
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getDependencies
public int getDependencies()Get the dependencies of the pattern. The only possible dependency for a pattern is on local variables. This is analyzed in those patterns where local variables may appear.- Overrides:
getDependencies
in classPattern
- Returns:
- the dependencies, as a bit-significant mask
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iterateSubExpressions
Iterate over the subexpressions within this pattern- Overrides:
iterateSubExpressions
in classPattern
- Returns:
- an iterator over the subexpressions.
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getLHS
Get the LHS of the union- Returns:
- the first operand of the union
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getRHS
Get the RHS of the union- Returns:
- the second operand of the union
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setSystemId
Override method to set the system ID, so it's set on both halves- Overrides:
setSystemId
in classPattern
- Parameters:
systemId
- the URI of the module containing the pattern
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setLineNumber
public void setLineNumber(int lineNumber) Override method to set the system ID, so it's set on both halves- Overrides:
setLineNumber
in classPattern
- Parameters:
lineNumber
- the line number of the pattern in the source module
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equals
Determine whether this pattern is the same as another pattern -
hashCode
public int hashCode()Hashcode supporting equals()
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