net.sf.saxon.instruct
Class FixedElement

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.instruct.Instruction
          net.sf.saxon.instruct.ParentNodeConstructor
              net.sf.saxon.instruct.ElementCreator
                  net.sf.saxon.instruct.FixedElement

All Implemented Interfaces:

Serializable, SourceLocator, Container, EvaluableItem, SequenceIterable, TailCallReturner, InstructionInfoProvider

public class FixedElement
extends ElementCreator

An instruction that creates an element node whose name is known statically. Used for literal results elements in XSLT, for direct element constructors in XQuery, and for xsl:element in cases where the name and namespace are known statically.

See Also:

Serialized Form

Field Summary

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

FixedElement(int nameCode, int[] namespaceCodes, boolean inheritNamespaces, SchemaType schemaType, int validation)
Create an instruction that creates a new element node

Method Summary

void	checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type.
void	display(int level, PrintStream out, Configuration config) Display this instruction as an expression, for diagnostics
int[]	getActiveNamespaces() Callback to get a list of the intrinsic namespaces that need to be generated for the element.
InstructionInfo	getInstructionInfo() Get InstructionInfo for this expression
ItemType	getItemType(TypeHierarchy th) Get the type of the item returned by this instruction
int	getNameCode(XPathContext context) Callback from the superclass ElementCreator to get the nameCode for the element name
String	getNewBaseURI(XPathContext context) Get the base URI for the element being constructed
Expression	simplify(StaticContext env) Simplify an expression.

Methods inherited from class net.sf.saxon.instruct.ElementCreator

computeSpecialProperties, evaluateItem, getImplementationMethod, isInheritNamespaces, isValidating, processLeavingTail, setValidationMode, suppressValidation

Methods inherited from class net.sf.saxon.instruct.ParentNodeConstructor

computeCardinality, createsNewNodes, getBaseURI, getCardinality, getContentExpression, getSchemaType, getValidationMode, isLazyConstruction, isNamespaceSensitive, iterateSubExpressions, optimize, replaceSubExpression, setBaseURI, setContentExpression, setLazyConstruction, setSchemaType, typeCheck

Methods inherited from class net.sf.saxon.instruct.Instruction

appendItem, evaluateAsString, getInstructionNameCode, getSourceLocator, isXSLT, iterate, process, promote

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

adoptChildExpression, computeDependencies, computeStaticProperties, doPromotion, effectiveBooleanValue, getColumnNumber, getContainingProcedure, getDependencies, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, setParentExpression

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

Constructor Detail

FixedElement

public FixedElement(int nameCode,
                    int[] namespaceCodes,
                    boolean inheritNamespaces,
                    SchemaType schemaType,
                    int validation)

Create an instruction that creates a new element node

Parameters:

nameCode - Represents the name of the element node

namespaceCodes - List of namespaces to be added to the element node. May be null if none are required.

inheritNamespaces - true if the children of this element are to inherit its namespaces

schemaType - Type annotation for the new element node

Method Detail

getInstructionInfo

public InstructionInfo getInstructionInfo()

Description copied from class: Expression

Get InstructionInfo for this expression

Specified by:

getInstructionInfo in interface InstructionInfoProvider

Overrides:

getInstructionInfo in class Instruction

simplify

public Expression simplify(StaticContext env)
                    throws XPathException

Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression).

Overrides:

simplify in class ParentNodeConstructor

Returns:

the simplified expression

Throws:

XPathException - if an error is discovered during expression rewriting

getItemType

public ItemType getItemType(TypeHierarchy th)

Get the type of the item returned by this instruction

Overrides:

getItemType in class ElementCreator

Parameters:

th - The type hierarchy cache

Returns:

the item type

getNameCode

public int getNameCode(XPathContext context)

Callback from the superclass ElementCreator to get the nameCode for the element name

Specified by:

getNameCode in class ElementCreator

Parameters:

context - The evaluation context (not used)

Returns:

the name code for the element name

getNewBaseURI

public String getNewBaseURI(XPathContext context)

Description copied from class: ElementCreator

Get the base URI for the element being constructed

Specified by:

getNewBaseURI in class ElementCreator

checkPermittedContents

public void checkPermittedContents(SchemaType parentType,
                                   StaticContext env,
                                   boolean whole)
                            throws XPathException

Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. It's always OK to say yes, since the check will be repeated at run-time. The process of checking element and attribute constructors against the content model of a complex type also registers the type of content expected of those constructors, so the static validation can continue recursively.

Overrides:

checkPermittedContents in class Expression

Throws:

XPathException

getActiveNamespaces

public int[] getActiveNamespaces()

Callback to get a list of the intrinsic namespaces that need to be generated for the element. The result is an array of namespace codes, the codes either occupy the whole array or are terminated by a -1 entry. A result of null is equivalent to a zero-length array.

Overrides:

getActiveNamespaces in class ElementCreator

display

public void display(int level,
                    PrintStream out,
                    Configuration config)

Display this instruction as an expression, for diagnostics

Specified by:

display in class Expression

Parameters:

level - indentation level for this expression

out - Output destination