net.sf.saxon.style

Class ExpressionContext

java.lang.Object

net.sf.saxon.style.ExpressionContext

All Implemented Interfaces:

StaticContext, XSLTStaticContext

Direct Known Subclasses:

TextValueTemplateContext

public class ExpressionContext
extends java.lang.Object
implements XSLTStaticContext

An ExpressionContext represents the context for an XPath expression written in the stylesheet.

Constructor Summary

Constructors

Constructor and Description
ExpressionContext(StyleElement styleElement, StructuredQName attributeName) Create a static context for XPath expressions in an XSLT stylesheet

Method Summary

Modifier and Type	Method and Description
Expression	bindVariable(StructuredQName qName) Bind a variable to an object that can be used to refer to it
Configuration	getConfiguration() Get the system configuration
Location	getContainingLocation() Get the containing location of an XPath expression within the stylesheet
DecimalFormatManager	getDecimalFormatManager() Get a DecimalFormatManager to resolve the names of decimal formats used in calls to the format-number() function.
java.lang.String	getDefaultCollationName() Get the default collation.
java.lang.String	getDefaultElementNamespace() Get the default XPath namespace for elements and types Return NamespaceConstant.NULL for the non-namespace
java.lang.String	getDefaultFunctionNamespace() Get the default function namespace
FunctionLibrary	getFunctionLibrary() Get the function library containing all the in-scope functions available in this static context
java.util.Set<java.lang.String>	getImportedSchemaNamespaces() Get the set of imported schemas
KeyManager	getKeyManager() Get the KeyManager, containing definitions of keys available for use.
NamespaceResolver	getNamespaceResolver() Get a copy of the NamespaceResolver suitable for saving in the executable code
StylesheetPackage	getPackageData() Get information about the containing package (unit of compilation)
ItemType	getRequiredContextItemType() Get the required type of the context item.
java.lang.String	getStaticBaseURI() Get the Base URI of the element containing the expression, for resolving any relative URI's used in the expression.
StyleElement	getStyleElement() Get the stylesheet element containing this XPath expression
java.lang.String	getSystemId() Get the System ID of the entity containing the expression (used for diagnostics)
int	getXPathVersion() Get the XPath language level supported, as an integer.
boolean	isElementAvailable(java.lang.String qname) Determine if an extension element is available
boolean	isImportedSchema(java.lang.String namespace) Test whether a schema has been imported for a given namespace
boolean	isInBackwardsCompatibleMode() Determine whether Backwards Compatible Mode is used
boolean	isSchemaAware() Ask whether expressions compiled under this static context are schema-aware.
void	issueWarning(java.lang.String s, Location locator) Issue a compile-time warning
XPathContext	makeEarlyEvaluationContext() Construct a dynamic context for early evaluation of constant subexpressions
RetainedStaticContext	makeRetainedStaticContext() Construct a RetainedStaticContext, which extracts information from this StaticContext to provide the subset of static context information that is potentially needed during expression evaluation
ItemType	resolveTypeAlias(StructuredQName typeName) Get type alias.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionContext

public ExpressionContext(StyleElement styleElement,
                         StructuredQName attributeName)

Create a static context for XPath expressions in an XSLT stylesheet

Parameters:

styleElement - the element on which the XPath expression appears

attributeName - the name of the attribute in which the XPath expression appears; or null if the expression appears in a text node

Method Detail

getConfiguration

public Configuration getConfiguration()

Get the system configuration

Specified by:

getConfiguration in interface StaticContext

Returns:

the Saxon configuration

getPackageData

public StylesheetPackage getPackageData()

Description copied from interface: StaticContext

Get information about the containing package (unit of compilation)

Specified by:

getPackageData in interface StaticContext

Returns:

the package data

isSchemaAware

public boolean isSchemaAware()

Ask whether expressions compiled under this static context are schema-aware. They must be schema-aware if the expression is to handle typed (validated) nodes

Returns:

true if expressions are schema-aware

makeEarlyEvaluationContext

public XPathContext makeEarlyEvaluationContext()

Construct a dynamic context for early evaluation of constant subexpressions

Specified by:

makeEarlyEvaluationContext in interface StaticContext

Returns:

a newly constructed dynamic context

makeRetainedStaticContext

public RetainedStaticContext makeRetainedStaticContext()

Construct a RetainedStaticContext, which extracts information from this StaticContext to provide the subset of static context information that is potentially needed during expression evaluation

Specified by:

makeRetainedStaticContext in interface StaticContext

Returns:

a RetainedStaticContext object: either a newly created one, or one that is reused from a previous invocation.

getContainingLocation

public Location getContainingLocation()

Get the containing location of an XPath expression within the stylesheet

Specified by:

getContainingLocation in interface StaticContext

Returns:

a Location that identifies the containing element, together with the name of the attribute holding the XPath expression in question.

issueWarning

public void issueWarning(java.lang.String s,
                         Location locator)

Issue a compile-time warning

Specified by:

issueWarning in interface StaticContext

Parameters:

s - The warning message. This should not contain any prefix such as "Warning".

locator - the location of the construct in question. May be null.

getSystemId

public java.lang.String getSystemId()

Get the System ID of the entity containing the expression (used for diagnostics)

Specified by:

getSystemId in interface StaticContext

Returns:

the system ID

getStaticBaseURI

public java.lang.String getStaticBaseURI()

Get the Base URI of the element containing the expression, for resolving any relative URI's used in the expression. Used by the document() function.

Specified by:

getStaticBaseURI in interface StaticContext

Returns:

the static base URI, or null if not known

getNamespaceResolver

public NamespaceResolver getNamespaceResolver()

Get a copy of the NamespaceResolver suitable for saving in the executable code

Specified by:

getNamespaceResolver in interface StaticContext

Returns:

a NamespaceResolver

getRequiredContextItemType

public ItemType getRequiredContextItemType()

Get the required type of the context item. If no type has been explicitly declared for the context item, an instance of AnyItemType (representing the type item()) is returned.

Specified by:

getRequiredContextItemType in interface StaticContext

Returns:

the required type of the context item

Since:

9.3

getDecimalFormatManager

public DecimalFormatManager getDecimalFormatManager()

Get a DecimalFormatManager to resolve the names of decimal formats used in calls to the format-number() function.

Specified by:

getDecimalFormatManager in interface StaticContext

Returns:

the decimal format manager for this static context, or null if named decimal formats are not supported in this environment.

bindVariable

public Expression bindVariable(StructuredQName qName)
                        throws XPathException

Bind a variable to an object that can be used to refer to it

Specified by:

bindVariable in interface StaticContext

Parameters:

qName - the name of the variable

Returns:

a VariableDeclaration object that can be used to identify it in the Bindery,

Throws:

XPathException - if the variable has not been declared

getFunctionLibrary

public FunctionLibrary getFunctionLibrary()

Get the function library containing all the in-scope functions available in this static context

Specified by:

getFunctionLibrary in interface StaticContext

Returns:

the function library

isElementAvailable

public boolean isElementAvailable(java.lang.String qname)
                           throws XPathException

Determine if an extension element is available

Specified by:

isElementAvailable in interface XSLTStaticContext

Throws:

XPathException - if the name is invalid or the prefix is not declared

getDefaultCollationName

public java.lang.String getDefaultCollationName()

Get the default collation. Return null if no default collation has been defined

Specified by:

getDefaultCollationName in interface StaticContext

Returns:

the name of the default collation; or the name of the codepoint collation if no default collation has been defined

getDefaultElementNamespace

public java.lang.String getDefaultElementNamespace()

Get the default XPath namespace for elements and types Return NamespaceConstant.NULL for the non-namespace

Specified by:

getDefaultElementNamespace in interface StaticContext

Returns:

the default namespace, or NamespaceConstant.NULL for the non-namespace

getDefaultFunctionNamespace

public java.lang.String getDefaultFunctionNamespace()

Get the default function namespace

Specified by:

getDefaultFunctionNamespace in interface StaticContext

Returns:

the default namespace for function names

isInBackwardsCompatibleMode

public boolean isInBackwardsCompatibleMode()

Determine whether Backwards Compatible Mode is used

Specified by:

isInBackwardsCompatibleMode in interface StaticContext

Returns:

true if 1.0 compaibility mode is in force.

getXPathVersion

public int getXPathVersion()

Get the XPath language level supported, as an integer. From Saxon 9.8 this is always 3.1 (returned as 31)

Specified by:

getXPathVersion in interface StaticContext

Returns:

the XPath language level; from Saxon 9.8 the return value will be 31.

Since:

9.3

isImportedSchema

public boolean isImportedSchema(java.lang.String namespace)

Test whether a schema has been imported for a given namespace

Specified by:

isImportedSchema in interface StaticContext

Parameters:

namespace - the target namespace of the required schema

Returns:

true if a schema for this namespace has been imported

getImportedSchemaNamespaces

public java.util.Set<java.lang.String> getImportedSchemaNamespaces()

Get the set of imported schemas

Specified by:

getImportedSchemaNamespaces in interface StaticContext

Returns:

a Set, the set of URIs representing the names of imported schemas

getKeyManager

public KeyManager getKeyManager()

Get the KeyManager, containing definitions of keys available for use.

Specified by:

getKeyManager in interface StaticContext

Returns:

the KeyManager. This is used to resolve key names, both explicit calls on key() used in XSLT, and system-generated calls on key() which may also appear in XQuery and XPath

getStyleElement

public StyleElement getStyleElement()

Get the stylesheet element containing this XPath expression

Returns:

the element in the tree representation of the source stylesheet

resolveTypeAlias

public ItemType resolveTypeAlias(StructuredQName typeName)

Get type alias. This is a Saxon extension. A type alias is a QName which can be used as a shorthand for an itemtype, using the syntax ~typename anywhere that an item type is permitted.

Specified by:

resolveTypeAlias in interface StaticContext

Parameters:

typeName - the name of the type alias

Returns:

the corresponding item type, if the name is recognised; otherwise null.