net.sf.saxon.instruct
Class Namespace

java.lang.Object
  |
  +--net.sf.saxon.expr.ComputedExpression
        |
        +--net.sf.saxon.instruct.Instruction
              |
              +--net.sf.saxon.instruct.InstructionWithChildren
                    |
                    +--net.sf.saxon.instruct.SimpleNodeConstructor
                          |
                          +--net.sf.saxon.instruct.Namespace
All Implemented Interfaces:
Container, Expression, InstructionInfoProvider, java.io.Serializable, javax.xml.transform.SourceLocator

public class Namespace
extends SimpleNodeConstructor

An xsl:namespace element in the stylesheet. (XSLT 2.0)

See Also:
Serialized Form

Field Summary
 
Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
select, separator
 
Fields inherited from class net.sf.saxon.instruct.InstructionWithChildren
children
 
Fields inherited from class net.sf.saxon.expr.ComputedExpression
locationId, staticProperties
 
Fields inherited from interface net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
 
Constructor Summary
Namespace(Expression name)
           
 
Method Summary
 void display(int level, NamePool pool, java.io.PrintStream out)
          Display this instruction as an expression, for diagnostics
 int getCardinality()
          Determine the static cardinality of the expression.
 int getInstructionNameCode()
          Set the name of this instruction for diagnostic and tracing purposes
 ItemType getItemType()
          Get the item type of the items returned by evaluating this instruction
 java.util.Iterator iterateSubExpressions()
          Get the immediate sub-expressions of this expression.
 TailCall processLeavingTail(XPathContext context)
          ProcessLeavingTail: called to do the real work of this instruction.
protected  void promoteInst(PromotionOffer offer)
          Offer promotion for subexpressions.
 void typeCheck(StaticContext env, ItemType contextItemType)
           
 
Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
analyze, checkContent, evaluateItem, evaluateNameCode, expandChildren, iterate, setSelect, setSeparator, simplify
 
Methods inherited from class net.sf.saxon.instruct.InstructionWithChildren
displayChildren, getChildren, processChildren, processChildrenLeavingTail, setChildren
 
Methods inherited from class net.sf.saxon.instruct.Instruction
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, process, promote
 
Methods inherited from class net.sf.saxon.expr.ComputedExpression
adoptChildExpression, computeDependencies, computeStaticProperties, dynamicError, dynamicError, getColumnNumber, getConstructType, getDependencies, getExecutable, getIntrinsicDependencies, getLineNumber, getLocationId, getParentExpression, getPublicId, getSpecialProperties, getSystemId, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, typeError
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface javax.xml.transform.SourceLocator
getColumnNumber, getLineNumber, getPublicId, getSystemId
 

Constructor Detail

Namespace

public Namespace(Expression name)
Method Detail

getInstructionNameCode

public int getInstructionNameCode()
Set the name of this instruction for diagnostic and tracing purposes

Overrides:
getInstructionNameCode in class Instruction

getItemType

public ItemType getItemType()
Description copied from class: Instruction
Get the item type of the items returned by evaluating this instruction

Specified by:
getItemType in interface Expression
Overrides:
getItemType in class Instruction
Returns:
the static item type of the instruction

getCardinality

public int getCardinality()
Description copied from class: ComputedExpression
Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.

Specified by:
getCardinality in interface Expression
Overrides:
getCardinality in class ComputedExpression
Returns:
one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).

promoteInst

protected void promoteInst(PromotionOffer offer)
Description copied from class: SimpleNodeConstructor
Offer promotion for subexpressions. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.

Overrides:
promoteInst in class SimpleNodeConstructor
Parameters:
offer - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression

typeCheck

public void typeCheck(StaticContext env,
                      ItemType contextItemType)
Specified by:
typeCheck in class SimpleNodeConstructor

iterateSubExpressions

public java.util.Iterator iterateSubExpressions()
Description copied from class: InstructionWithChildren
Get the immediate sub-expressions of this expression.

Specified by:
iterateSubExpressions in interface Expression
Overrides:
iterateSubExpressions in class SimpleNodeConstructor
Returns:
an iterator containing the sub-expressions of this expression

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws XPathException
Description copied from class: Instruction
ProcessLeavingTail: called to do the real work of this instruction. This method must be implemented in each subclass. The results of the instruction are written to the current Receiver, which can be obtained via the Controller.

Specified by:
processLeavingTail in class Instruction
Parameters:
context - The dynamic context of the transformation, giving access to the current node, the current variables, etc.
Returns:
null if the instruction has completed execution; or a TailCall indicating a function call or template call that is delegated to the caller, to be made after the stack has been unwound so as to save stack space.
XPathException

display

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

Specified by:
display in interface Expression
Overrides:
display in class SimpleNodeConstructor
Parameters:
level - indentation level for this expression
pool - NamePool used to expand any names appearing in the expression
out - Output destination