net.sf.saxon.expr
Class StaticProperty

java.lang.Object
  net.sf.saxon.expr.StaticProperty

public abstract class StaticProperty
extends Object

This class contains constants identifying dependencies that an XPath expression might have on its context.

Field Summary

static int	ALLOWS_MANY Bit set if multiple values are allowed
static int	ALLOWS_ONE Bit set if a single value is allowed
static int	ALLOWS_ONE_OR_MORE Occurence indicator for "one or more" (+)
static int	ALLOWS_ZERO
static int	ALLOWS_ZERO_OR_MORE Occurence indicator for "zero or more" (*)
static int	ALLOWS_ZERO_OR_ONE Occurence indicator for "zero or one" (?)
static int	ATTRIBUTE_NS_NODESET Expression property: this bit is set by getProperties() in the case of an expression that delivers a set of nodes with the guarantee that every node in the result will be an attribute or namespace of the context node
static int	CARDINALITY_MASK Mask for all cardinality bits
static int	CONTEXT_DOCUMENT_NODESET Expression property: this bit is set by getProperties() in the case of an expression whose item type is node, when the nodes in the result are guaranteed all to be in the same document as the context node.
static int	DEPENDENCY_MASK Mask to select all the dependency bits
static int	DEPENDS_ON_ASSIGNABLE_GLOBALS Bit setting: Expression depends on assignable global variables
static int	DEPENDS_ON_CONTEXT_DOCUMENT Bit setting: Expression depends on the document containing the context node
static int	DEPENDS_ON_CONTEXT_ITEM Bit setting: Expression depends on context item
static int	DEPENDS_ON_CURRENT_GROUP Bit setting: Expression depends on current-group() and/or current-grouping-key()
static int	DEPENDS_ON_CURRENT_ITEM Bit setting: Expression depends on current() item
static int	DEPENDS_ON_FOCUS Combination of bits representing dependencies on the focus
static int	DEPENDS_ON_LAST Bit setting: Expression depends on last()
static int	DEPENDS_ON_LOCAL_VARIABLES Bit setting: Expression depends on local variables
static int	DEPENDS_ON_NON_DOCUMENT_FOCUS Combination of bits representing dependencies on the focus, but excluding dependencies on the current document
static int	DEPENDS_ON_POSITION Bit setting: Expression depends on position()
static int	DEPENDS_ON_REGEX_GROUP Bit setting: Expression depends on regex-group()
static int	DEPENDS_ON_RUNTIME_ENVIRONMENT Bit setting: Expression can't be evaluated at compile time for reasons other than the above
static int	DEPENDS_ON_USER_FUNCTIONS Bit setting: Expression depends on user-defined functions
static int	DEPENDS_ON_XSLT_CONTEXT Combination of bits representing dependencies on the XSLT context
static int	EMPTY Occurence indicator when an empty sequence is required
static int	EXACTLY_ONE Occurence indicator for "exactly one" (default occurrence indicator)
static int	HAS_SIDE_EFFECTS Expression property: this bit indicates that an expression has (or might have) side-effects.
static int	NON_CREATIVE Expression property: this bit is set in the case of an expression that will never return newly created nodes, nor a value that depends on the identity of newly created nodes (for example generate-id(new-node())).
static int	NOT_UNTYPED Expression property: this bit indicates that although the static type of the expression permits untyped values, it is known that the value will not be untyped.
static int	ORDERED_NODESET Expression property: this bit is set by getProperties() in the case of an expression whose item type is node, when the nodes in the result are in document order.
static int	PEER_NODESET Expression property: this bit is set by getProperties() in the case of an expression that delivers a set of nodes with the guarantee that no node in the set will be an ancestor of any other.
static int	REVERSE_DOCUMENT_ORDER Expression property: this bit is set by getProperties() in the case of an expression that delivers items in the reverse of the correct order, when unordered retrieval is requested.
static int	SINGLE_DOCUMENT_NODESET Expression property: this bit is set in the case of an expression that delivers a set of nodes that are all in the same document (not necessarily the same document as the context node).
static int	SPECIAL_PROPERTY_MASK Mask for "special properties": that is, all properties other than cardinality and dependencies
static int	SUBTREE_NODESET Expression property: this bit is set by getProperties() in the case of an expression that delivers a set of nodes with the guarantee that every node in the result will be a descendant or self, or attribute or namespace, of the context node

Method Summary

static int	getCardinalityCode(int cardinality) Reduce the cardinality value to an integer in the range 0-7
static String	getCardinalityDescription(int cardinality) Display the cardinality value as a string (used for diagnostics)

Methods inherited from class java.lang.Object

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

Field Detail

DEPENDS_ON_CURRENT_ITEM

public static final int DEPENDS_ON_CURRENT_ITEM

Bit setting: Expression depends on current() item

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Constant Field Values

DEPENDS_ON_CONTEXT_ITEM

public static final int DEPENDS_ON_CONTEXT_ITEM

Bit setting: Expression depends on context item

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DEPENDS_ON_POSITION

public static final int DEPENDS_ON_POSITION

Bit setting: Expression depends on position()

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DEPENDS_ON_LAST

public static final int DEPENDS_ON_LAST

Bit setting: Expression depends on last()

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DEPENDS_ON_CONTEXT_DOCUMENT

public static final int DEPENDS_ON_CONTEXT_DOCUMENT

Bit setting: Expression depends on the document containing the context node

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DEPENDS_ON_CURRENT_GROUP

public static final int DEPENDS_ON_CURRENT_GROUP

Bit setting: Expression depends on current-group() and/or current-grouping-key()

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DEPENDS_ON_REGEX_GROUP

public static final int DEPENDS_ON_REGEX_GROUP

Bit setting: Expression depends on regex-group()

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DEPENDS_ON_LOCAL_VARIABLES

public static final int DEPENDS_ON_LOCAL_VARIABLES

Bit setting: Expression depends on local variables

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DEPENDS_ON_USER_FUNCTIONS

public static final int DEPENDS_ON_USER_FUNCTIONS

Bit setting: Expression depends on user-defined functions

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DEPENDS_ON_ASSIGNABLE_GLOBALS

public static final int DEPENDS_ON_ASSIGNABLE_GLOBALS

Bit setting: Expression depends on assignable global variables

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DEPENDS_ON_RUNTIME_ENVIRONMENT

public static final int DEPENDS_ON_RUNTIME_ENVIRONMENT

Bit setting: Expression can't be evaluated at compile time for reasons other than the above

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DEPENDS_ON_XSLT_CONTEXT

public static final int DEPENDS_ON_XSLT_CONTEXT

Combination of bits representing dependencies on the XSLT context

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DEPENDS_ON_FOCUS

public static final int DEPENDS_ON_FOCUS

Combination of bits representing dependencies on the focus

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DEPENDS_ON_NON_DOCUMENT_FOCUS

public static final int DEPENDS_ON_NON_DOCUMENT_FOCUS

Combination of bits representing dependencies on the focus, but excluding dependencies on the current document

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Constant Field Values

ALLOWS_ZERO

public static final int ALLOWS_ZERO

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ALLOWS_ONE

public static final int ALLOWS_ONE

Bit set if a single value is allowed

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ALLOWS_MANY

public static final int ALLOWS_MANY

Bit set if multiple values are allowed

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CARDINALITY_MASK

public static final int CARDINALITY_MASK

Mask for all cardinality bits

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ALLOWS_ONE_OR_MORE

public static final int ALLOWS_ONE_OR_MORE

Occurence indicator for "one or more" (+)

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ALLOWS_ZERO_OR_MORE

public static final int ALLOWS_ZERO_OR_MORE

Occurence indicator for "zero or more" (*)

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ALLOWS_ZERO_OR_ONE

public static final int ALLOWS_ZERO_OR_ONE

Occurence indicator for "zero or one" (?)

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EXACTLY_ONE

public static final int EXACTLY_ONE

Occurence indicator for "exactly one" (default occurrence indicator)

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EMPTY

public static final int EMPTY

Occurence indicator when an empty sequence is required

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CONTEXT_DOCUMENT_NODESET

public static final int CONTEXT_DOCUMENT_NODESET

Expression property: this bit is set by getProperties() in the case of an expression whose item type is node, when the nodes in the result are guaranteed all to be in the same document as the context node. For expressions that return values other than nodes, the setting is undefined.

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ORDERED_NODESET

public static final int ORDERED_NODESET

Expression property: this bit is set by getProperties() in the case of an expression whose item type is node, when the nodes in the result are in document order.

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REVERSE_DOCUMENT_ORDER

public static final int REVERSE_DOCUMENT_ORDER

Expression property: this bit is set by getProperties() in the case of an expression that delivers items in the reverse of the correct order, when unordered retrieval is requested.

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PEER_NODESET

public static final int PEER_NODESET

Expression property: this bit is set by getProperties() in the case of an expression that delivers a set of nodes with the guarantee that no node in the set will be an ancestor of any other. This property is useful in deciding whether the results of a path expression are pre-sorted. The property is only used in the case where the NATURALLY_SORTED property is true, so there is no point in setting it in other cases.

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SUBTREE_NODESET

public static final int SUBTREE_NODESET

Expression property: this bit is set by getProperties() in the case of an expression that delivers a set of nodes with the guarantee that every node in the result will be a descendant or self, or attribute or namespace, of the context node

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ATTRIBUTE_NS_NODESET

public static final int ATTRIBUTE_NS_NODESET

Expression property: this bit is set by getProperties() in the case of an expression that delivers a set of nodes with the guarantee that every node in the result will be an attribute or namespace of the context node

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NON_CREATIVE

public static final int NON_CREATIVE

Expression property: this bit is set in the case of an expression that will never return newly created nodes, nor a value that depends on the identity of newly created nodes (for example generate-id(new-node())). Expressions that do create new nodes cannot be moved out of loops as this could cause too few nodes to be created: for example if f() creates a new node, then count(for $i in 1 to 5 return f()) must be 5.

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SINGLE_DOCUMENT_NODESET

public static final int SINGLE_DOCUMENT_NODESET

Expression property: this bit is set in the case of an expression that delivers a set of nodes that are all in the same document (not necessarily the same document as the context node).

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HAS_SIDE_EFFECTS

public static final int HAS_SIDE_EFFECTS

Expression property: this bit indicates that an expression has (or might have) side-effects. This property is applied to calls on extension functions and to certain instructions such as xsl:result-document and xsl:message.

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NOT_UNTYPED

public static final int NOT_UNTYPED

Expression property: this bit indicates that although the static type of the expression permits untyped values, it is known that the value will not be untyped.

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DEPENDENCY_MASK

public static final int DEPENDENCY_MASK

Mask to select all the dependency bits

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SPECIAL_PROPERTY_MASK

public static final int SPECIAL_PROPERTY_MASK

Mask for "special properties": that is, all properties other than cardinality and dependencies

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Method Detail

getCardinalityCode

public static int getCardinalityCode(int cardinality)

Reduce the cardinality value to an integer in the range 0-7

Parameters:

cardinality - the result of calling getCardinality() on an expression

Returns:

the cardinality code

getCardinalityDescription

public static String getCardinalityDescription(int cardinality)

Display the cardinality value as a string (used for diagnostics)

Parameters:

cardinality - the cardinality as returned by getCardinality() applied to an expression

Returns:

a string describing the cardinality