net.sf.saxon.instruct

Class FixedElement

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.
Field Summary
protected int[]namespaceCodes
Constructor Summary
FixedElement(int nameCode, int[] namespaceCodes, boolean inheritNamespaces, SchemaType schemaType, int validation)
Create an instruction that creates a new element node
Method Summary
voidcheckPermittedContents(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.
voiddisplay(int level, NamePool pool, PrintStream out)
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.
InstructionInfogetInstructionInfo()
ItemTypegetItemType(TypeHierarchy th)
Get the type of the item returned by this instruction
intgetNameCode(XPathContext context)
Callback from the superclass ElementCreator to get the nameCode for the element name
SchemaTypegetXSIType(StaticContext env)
Determine whether the element constructor creates a fixed xsi:type attribute, and if so, return the relevant type.
protected voidoutputNamespaceNodes(XPathContext context, Receiver out)
Callback from the superclass ElementCreator to output the namespace nodes
Expressionsimplify(StaticContext env)
Simplify an expression.

Field Detail

namespaceCodes

protected int[] namespaceCodes

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

checkPermittedContents

public 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. 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.

display

public void display(int level, NamePool pool, PrintStream out)
Display this instruction as an expression, for diagnostics

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.

getInstructionInfo

public InstructionInfo getInstructionInfo()

getItemType

public ItemType getItemType(TypeHierarchy th)
Get the type of the item returned by this instruction

Parameters: th

Returns: the item type

getNameCode

public int getNameCode(XPathContext context)
Callback from the superclass ElementCreator to get the nameCode for the element name

Parameters: context The evaluation context (not used)

Returns: the name code for the element name

getXSIType

public SchemaType getXSIType(StaticContext env)
Determine whether the element constructor creates a fixed xsi:type attribute, and if so, return the relevant type.

Returns: the type denoted by the constructor's xsi:type attribute if there is one. Return null if there is no xsi:type attribute, or if the value of the xsi:type attribute is a type that is not statically known (this is allowed)

Throws: XPathException if there is an xsi:type attribute and its value is not a QName.

outputNamespaceNodes

protected void outputNamespaceNodes(XPathContext context, Receiver out)
Callback from the superclass ElementCreator to output the namespace nodes

Parameters: context The evaluation context (not used) out The receiver to handle the output

simplify

public Expression simplify(StaticContext env)
Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression).

Returns: the simplified expression

Throws: net.sf.saxon.trans.XPathException if an error is discovered during expression rewriting