Package net.sf.saxon.expr.instruct
Class NamespaceConstructor
- java.lang.Object
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- net.sf.saxon.expr.Expression
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- net.sf.saxon.expr.instruct.Instruction
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- net.sf.saxon.expr.instruct.SimpleNodeConstructor
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- net.sf.saxon.expr.instruct.NamespaceConstructor
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- All Implemented Interfaces:
ExportAgent,TailCallReturner,Locatable,IdentityComparable,Traceable
public class NamespaceConstructor extends SimpleNodeConstructor
A namespace constructor instruction. (xsl:namespace in XSLT 2.0, or namespace{}{} in XQuery 1.1)
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Field Summary
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Fields inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor
selectOp
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Fields inherited from class net.sf.saxon.expr.Expression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_COST, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
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Constructor Summary
Constructors Constructor Description NamespaceConstructor(Expression name)Create an xsl:namespace instruction for dynamic construction of namespace nodes
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Expressioncopy(RebindingMap rebindings)Copy an expression.NodeInfoevaluateItem(XPathContext context)Evaluate as an expression.NodeNameevaluateNodeName(XPathContext context)Run-time method to compute the name of the node being constructed.voidexport(ExpressionPresenter out)Diagnostic print of expression structure.intgetCardinality()Determine the static cardinality of the expression.intgetInstructionNameCode()Set the name of this instruction for diagnostic and tracing purposesItemTypegetItemType()Get the item type of the items returned by evaluating this instructionExpressiongetNameExp()voidlocalTypeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextItemType)Method to perform type-checking specific to the kind of instructionjava.lang.Iterable<Operand>operands()Get the immediate sub-expressions of this expression, with information about the relationship of each expression to its parent expression.voidprocessValue(java.lang.CharSequence value, Outputter output, XPathContext context)Process the value of the node, to create the new node.voidsetNameExp(Expression nameExp)-
Methods inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor
allowExtractingCommonSubexpressions, alwaysCreatesNewNodes, checkContent, computeCardinality, computeSpecialProperties, getSelect, getStreamerName, isLocal, iterate, mayCreateNewNodes, optimize, processLeavingTail, setSelect, typeCheck
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Methods inherited from class net.sf.saxon.expr.instruct.Instruction
assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getExpressionName, getImplementationMethod, getNetCost, getSourceLocator, isInstruction, isXSLT, process, someOperandCreatesNewNodes
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Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeHashCode, computeStaticProperties, dynamicError, effectiveBooleanValue, equals, evaluatePendingUpdates, explain, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, getTracingTag, hasCompatibleStaticContext, hashCode, hasSpecialProperty, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isEqual, isIdentical, isLiftable, isMultiThreaded, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, toShortString, toString, typeCheckChildren, typeError, unordered, verifyParentPointers
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Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface net.sf.saxon.trace.Traceable
gatherProperties
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Constructor Detail
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NamespaceConstructor
public NamespaceConstructor(Expression name)
Create an xsl:namespace instruction for dynamic construction of namespace nodes- Parameters:
name- the expression to evaluate the name of the node (that is, the prefix)
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Method Detail
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getNameExp
public Expression getNameExp()
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setNameExp
public void setNameExp(Expression nameExp)
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operands
public java.lang.Iterable<Operand> operands()
Description copied from class:ExpressionGet the immediate sub-expressions of this expression, with information about the relationship of each expression to its parent expression. Default implementation works off the results of iterateSubExpressions()If the expression is a Callable, then it is required that the order of the operands returned by this function is the same as the order of arguments supplied to the corresponding call() method.
- Overrides:
operandsin classSimpleNodeConstructor- Returns:
- an iterator containing the sub-expressions of this expression
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getInstructionNameCode
public int getInstructionNameCode()
Set the name of this instruction for diagnostic and tracing purposes- Overrides:
getInstructionNameCodein classInstruction- Returns:
- a code identifying the instruction: typically but not always the fingerprint of a name in the XSLT namespace
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getItemType
public ItemType getItemType()
Description copied from class:InstructionGet the item type of the items returned by evaluating this instruction- Overrides:
getItemTypein classInstruction- Returns:
- the static item type of the instruction
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getCardinality
public int getCardinality()
Description copied from class:ExpressionDetermine 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.- Overrides:
getCardinalityin classExpression- 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).
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localTypeCheck
public void localTypeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextItemType) throws XPathException
Description copied from class:SimpleNodeConstructorMethod to perform type-checking specific to the kind of instruction- Specified by:
localTypeCheckin classSimpleNodeConstructor- Parameters:
visitor- an expression visitorcontextItemType- the static type of the context item- Throws:
XPathException- if a type error is detected
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copy
public Expression copy(RebindingMap rebindings)
Copy an expression. This makes a deep copy.- Specified by:
copyin classExpression- Parameters:
rebindings-- Returns:
- the copy of the original expression
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evaluateNodeName
public NodeName evaluateNodeName(XPathContext context) throws XPathException
Description copied from class:SimpleNodeConstructorRun-time method to compute the name of the node being constructed. This is overridden for nodes that have a name. The default implementation returns null, which is suitable for unnamed nodes such as comments- Overrides:
evaluateNodeNamein classSimpleNodeConstructor- Parameters:
context- the XPath dynamic evaluation context- Returns:
- the name pool nameCode identifying the name of the constructed node
- Throws:
XPathException- if any failure occurs
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processValue
public void processValue(java.lang.CharSequence value, Outputter output, XPathContext context) throws XPathExceptionDescription copied from class:SimpleNodeConstructorProcess the value of the node, to create the new node.- Specified by:
processValuein classSimpleNodeConstructor- Parameters:
value- the string value of the new nodeoutput- the destination for the resultcontext- the dynamic evaluation context- Throws:
XPathException- if a dynamic error occurs
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evaluateItem
public NodeInfo evaluateItem(XPathContext context) throws XPathException
Evaluate as an expression. We rely on the fact that when these instructions are generated by XQuery, there will always be a valueExpression to evaluate the content- Overrides:
evaluateItemin classSimpleNodeConstructor- Parameters:
context- The context in which the expression is to be evaluated- Returns:
- the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence
- Throws:
XPathException- if any dynamic error occurs evaluating the expression
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export
public void export(ExpressionPresenter out) throws XPathException
Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.- Specified by:
exportin interfaceExportAgent- Specified by:
exportin classExpression- Parameters:
out- the expression presenter used to display the structure- Throws:
XPathException- if the export fails, for example if an expression is found that won't work in the target environment.
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