Package net.sf.saxon.pattern

Class UnionPattern

java.lang.Object

net.sf.saxon.expr.Expression

net.sf.saxon.expr.PseudoExpression

net.sf.saxon.pattern.Pattern

net.sf.saxon.pattern.VennPattern

net.sf.saxon.pattern.UnionPattern

All Implemented Interfaces:

ExportAgent, Locatable, IdentityComparable, Traceable

public class UnionPattern
extends VennPattern

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

Field Summary

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

p1, p2

Fields inherited from class net.sf.saxon.expr.Expression

EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_COST, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD

Constructor Summary

Constructors

Constructor	Description
UnionPattern(Pattern p1, Pattern p2)	Constructor

Method Summary

Modifier and Type	Method	Description
protected int	computeHashCode()	Hashcode supporting equals()
Pattern	convertToTypedPattern(String val)	Convert the pattern to a typed pattern, in which an element name is treated as schema-element(N)
Pattern	copy(RebindingMap rebindings)	Copy a pattern.
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
protected String	getOperatorName()	Get the relevant operator: "union", "intersect", or "except"
UType	getUType()	Get a UType indicating which kinds of items this Pattern can match.
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, bindCurrent, export, gatherComponentPatterns, getDependencies, getLHS, getRHS, isMotionless, matchesCurrentGroup, operands, reconstruct, simplify, typeCheck

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

effectiveBooleanValue, getDefaultPriority, getElaborator, getFingerprint, getHostLanguage, getOriginalText, handleDynamicError, isLiftable, isRecoverable, make, matchesItem, optimize, patternContainsVariable, replaceCurrent, selectNodes, setOriginalText, setPriority, setRecoverable, toPattern, toShortString, toString

Methods inherited from class net.sf.saxon.expr.PseudoExpression

computeCardinality, evaluateAsString, evaluateItem, getImplementationMethod, iterate, process

Methods inherited from class net.sf.saxon.expr.Expression

addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeSpecialProperties, computeStaticProperties, dispatchTailCall, dynamicError, explain, getCardinality, getConfiguration, getCost, getEvaluationMethod, getExpressionName, getExtraProperty, getIntegerBounds, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, getStreamerName, getTracingTag, hasCompatibleStaticContext, hashCode, hasSpecialProperty, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isEqual, isIdentical, isInstruction, isMultiThreaded, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, makeElaborator, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplifyChildren, staticTypeCheck, supportsLazyEvaluation, suppressValidation, typeCheckChildren, typeError, unordered, verifyParentPointers, withLocation

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.trace.Traceable

gatherProperties

Constructor Details

UnionPattern

public UnionPattern(Pattern p1,
 Pattern p2)

Constructor

Parameters:

p1 - the left-hand operand

p2 - the right-hand operand

Method Details

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

getUType

public UType getUType()

Get a UType indicating which kinds of items this Pattern can match.

Specified by:

getUType in class Pattern

Returns:

a UType indicating all the primitive types of item that the pattern can match.

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.

Returns:

true if the node matches either of the operand patterns

Throws:

XPathException - if an error occurs while matching the pattern

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)

convertToTypedPattern

public Pattern convertToTypedPattern(String val)
                              throws XPathException

Convert the pattern to a typed pattern, in which an element name is treated as schema-element(N)

Overrides:

convertToTypedPattern in class Pattern

Parameters:

val - either "strict" or "lax" depending on the value of xsl:mode/@typed

Returns:

either the original pattern unchanged, or a new pattern as the result of the conversion

Throws:

XPathException - if the pattern cannot be converted

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

Returns:

true if the other operand is an expression and if it can be determined that the two expressions are equivalent, in the sense that they will always return the same result.

computeHashCode

protected int computeHashCode()

Hashcode supporting equals()

Overrides:

computeHashCode in class VennPattern

Returns:

a computed hash code

getOperatorName

protected String getOperatorName()

Get the relevant operator: "union", "intersect", or "except"

Specified by:

getOperatorName in class VennPattern

Returns:

the operator, as a string

copy

public Pattern copy(RebindingMap rebindings)

Copy a pattern. This makes a deep copy.

Specified by:

copy in class Pattern

Parameters:

rebindings - variables that need to be re-bound

Returns:

the copy of the original pattern