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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.instruct.Instruction
net.sf.saxon.instruct.CopyOf
An xsl:copy-of element in the stylesheet.
Field Summary |
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 | |
CopyOf(Expression select,
boolean copyNamespaces,
int validation,
SchemaType schemaType)
|
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
protected static void |
copyAttribute(NodeInfo source,
SchemaType schemaType,
int validation,
int locationId,
XPathContext context)
|
boolean |
createsNewNodes()
Determine whether this instruction creates new nodes. |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure. |
Item |
evaluateItem(XPathContext context)
Return the first item if there is one, or null if not |
int |
getCardinality()
Determine the static cardinality of the expression. |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). |
int |
getInstructionNameCode()
Get the name of this instruction, for diagnostics and tracing |
ItemType |
getItemType()
Get the item type of the items returned by evaluating this instruction |
SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence. |
java.util.Iterator |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
java.lang.Object |
map(Item item,
XPathContext context,
java.lang.Object info)
Map one item to a sequence. |
TailCall |
processLeavingTail(XPathContext context)
Process this xsl:copy-of instruction |
protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites. |
void |
setRequireDocumentOrElement(boolean requireDocumentOrElement)
For XQuery, the operand (select) must be a single element or document node. |
Expression |
simplify(StaticContext env)
Simplify an expression. |
Methods inherited from class net.sf.saxon.instruct.Instruction |
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getInstructionInfo, getSourceLocator, isXSLT, process, promote |
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 |
public CopyOf(Expression select, boolean copyNamespaces, int validation, SchemaType schemaType)
Method Detail |
public final boolean createsNewNodes()
createsNewNodes
in class Instruction
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public void setRequireDocumentOrElement(boolean requireDocumentOrElement)
requireDocumentOrElement
- public int getImplementationMethod()
getImplementationMethod
in interface Expression
getImplementationMethod
in class Instruction
public TailCall processLeavingTail(XPathContext context) throws XPathException
processLeavingTail
in class Instruction
context
- the dynamic context for the transformation
XPathException
protected static void copyAttribute(NodeInfo source, SchemaType schemaType, int validation, int locationId, XPathContext context) throws XPathException
XPathException
public Expression simplify(StaticContext env) throws XPathException
Instruction
simplify
in interface Expression
simplify
in class Instruction
XPathException
- if an error is discovered during expression
rewritingpublic ItemType getItemType()
Instruction
getItemType
in interface Expression
getItemType
in class Instruction
public int getCardinality()
ComputedExpression
getCardinality
in interface Expression
getCardinality
in class ComputedExpression
public int getDependencies()
ComputedExpression
getDependencies
in interface Expression
getDependencies
in class ComputedExpression
protected void promoteInst(PromotionOffer offer) throws XPathException
Instruction
promoteInst
in class Instruction
offer
- The type of rewrite being offered
XPathException
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables will only be accurately known if they have been explicitly declared.
analyze
in interface Expression
analyze
in class Instruction
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public void display(int level, NamePool pool, java.io.PrintStream out)
display
in interface Expression
level
- indentation level for this expressionout
- pool
- NamePool used to expand any names appearing in the expressionpublic java.util.Iterator iterateSubExpressions()
ComputedExpression
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class Instruction
context
-
XPathException
public SequenceIterator iterate(XPathContext context) throws XPathException
Instruction
iterate
in interface Expression
iterate
in class Instruction
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic java.lang.Object map(Item item, XPathContext context, java.lang.Object info) throws XPathException
map
in interface MappingFunction
item
- The item to be mapped.
If context is supplied, this must be the same as context.currentItem().context
- The processing context. This is supplied only for mapping constructs that
set the context node, position, and size. Otherwise it is null.info
- Arbitrary information supplied by the creator of the MappingIterator. It must be
read-only and immutable for the duration of the iteration.
XPathException
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