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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.instruct.Instruction net.sf.saxon.expr.instruct.ParentNodeConstructor net.sf.saxon.expr.instruct.ElementCreator net.sf.saxon.expr.instruct.Copy
public class Copy
Handler for xsl:copy elements in stylesheet.
Field Summary |
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Fields inherited from class net.sf.saxon.expr.instruct.ElementCreator |
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inheritNamespaces |
Fields inherited from class net.sf.saxon.expr.instruct.ParentNodeConstructor |
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content, preservingTypes |
Fields inherited from class net.sf.saxon.expr.Expression |
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EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
Constructor Summary | |
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Copy(Expression select,
boolean selectSpecified,
boolean copyNamespaces,
boolean inheritNamespaces,
SchemaType schemaType,
int validation)
Create a shallow copy instruction |
Method Summary | |
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Expression |
copy()
Copy an expression. |
Item |
evaluateItem(XPathContext context)
Evaluate as an expression. |
void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure. |
NamespaceBinding[] |
getActiveNamespaces()
Callback to get a list of the intrinsic namespaces that need to be generated for the element. |
NodeName |
getElementName(XPathContext context,
NodeInfo copiedNode)
Callback from ElementCreator when constructing an element |
int |
getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes |
int |
getIntrinsicDependencies()
Determine which aspects of the context the expression depends on. |
ItemType |
getItemType(TypeHierarchy th)
Get the item type of the result of this instruction. |
String |
getNewBaseURI(XPathContext context,
NodeInfo copiedNode)
Get the base URI of a copied element node (the base URI is retained in the new copy) |
Expression |
getSelectExpression()
Get the expression that selects the node or other item to be copied |
boolean |
isCopyNamespaces()
Ask whether namespace nodes are to be copied (in the case of an element) |
boolean |
isSelectSpecified()
Ask whether the select attribute was explicitly specified |
Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
protected void |
outputNamespaceNodes(XPathContext context,
Receiver receiver,
NodeName nameCode,
NodeInfo copiedNode)
Callback to output namespace nodes for the new element. |
TailCall |
processLeavingTail(XPathContext context)
Evaluate the instruction to produce a new element node. |
void |
processLeft(Stack<XPathContext> contextStack,
Stack<Object> state)
Process the first half of the instruction in streaming mode |
void |
processRight(Stack<XPathContext> contextStack,
Stack<Object> state)
Process the second half of the instruction in streaming mode |
protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites. |
boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression |
Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression. |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform type checking of an expression and its subexpressions. |
Methods inherited from class net.sf.saxon.expr.instruct.ElementCreator |
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checkContentSequence, computeSpecialProperties, getImplementationMethod, isInheritNamespaces, iterateEvents, iterateEvents, processLeavingTail, processLeft, suppressValidation |
Methods inherited from class net.sf.saxon.expr.instruct.ParentNodeConstructor |
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addToPathMap, computeCardinality, createsNewNodes, getBaseURI, getCardinality, getContentExpression, getSchemaType, getValidationAction, isLazyConstruction, isNamespaceSensitive, isPreservingTypes, setBaseURI, setContentExpression, setLazyConstruction, setNoNeedToStrip, setSchemaType, setValidationAction |
Methods inherited from class net.sf.saxon.expr.instruct.Instruction |
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assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, process, promote |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface javax.xml.transform.SourceLocator |
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getColumnNumber, getLineNumber, getPublicId, getSystemId |
Constructor Detail |
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public Copy(Expression select, boolean selectSpecified, boolean copyNamespaces, boolean inheritNamespaces, SchemaType schemaType, int validation)
select
- selects the node (or other item) to be copied. Never null.selectSpecified
- true if the select attribute of xsl:copy was specified explicitly (in which
case the context for evaluating the body will change)copyNamespaces
- true if namespace nodes are to be copied when copying an elementinheritNamespaces
- true if child elements are to inherit the namespace nodes of their parentschemaType
- the Schema type against which the content is to be validatedvalidation
- the schema validation modeMethod Detail |
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public Expression getSelectExpression()
public boolean isSelectSpecified()
public boolean isCopyNamespaces()
public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify
in class ParentNodeConstructor
visitor
- an expression visitor
XPathException
- if an error is discovered during expression rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
Expression
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 may not be accurately known if they have not been explicitly declared.
If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.
typeCheck
in class ParentNodeConstructor
visitor
- an expression visitorcontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression copy()
copy
in class Expression
public boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in class ParentNodeConstructor
original
- the original subexpressionreplacement
- the replacement subexpression
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class Expression
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public Iterator<Expression> iterateSubExpressions()
iterateSubExpressions
in class ParentNodeConstructor
public ItemType getItemType(TypeHierarchy th)
getItemType
in class ElementCreator
th
- the type hierarchy cache
public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
Expression
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize
in class ParentNodeConstructor
visitor
- an expression visitorcontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
- if an error is discovered during this phase
(typically a type error)protected void promoteInst(PromotionOffer offer) throws XPathException
ParentNodeConstructor
promoteInst
in class ParentNodeConstructor
offer
- The type of rewrite being offered
XPathException
- if an error occurspublic NodeName getElementName(XPathContext context, NodeInfo copiedNode) throws XPathException
getElementName
in class ElementCreator
context
- XPath dynamic evaluation contextcopiedNode
- the node being copied
XPathException
public String getNewBaseURI(XPathContext context, NodeInfo copiedNode)
getNewBaseURI
in class ElementCreator
context
- XPath dynamic evaluation contextcopiedNode
-
protected void outputNamespaceNodes(XPathContext context, Receiver receiver, NodeName nameCode, NodeInfo copiedNode) throws XPathException
outputNamespaceNodes
in class ElementCreator
context
- The execution contextreceiver
- the Receiver where the namespace nodes are to be writtennameCode
- copiedNode
-
XPathException
public NamespaceBinding[] getActiveNamespaces() throws XPathException
getActiveNamespaces
in class ElementCreator
XPathException
- if an error occurspublic TailCall processLeavingTail(XPathContext context) throws XPathException
ElementCreator
processLeavingTail
in interface TailCallReturner
processLeavingTail
in class ElementCreator
context
- XPath dynamic evaluation context
XPathException
- if a dynamic error occurs during the evaluation
of the instructionpublic Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in class ElementCreator
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void processLeft(Stack<XPathContext> contextStack, Stack<Object> state) throws XPathException
processLeft
in interface DivisibleInstruction
processLeft
in class ElementCreator
contextStack
- the dynamic evaluation contextstate
- a stack on which the instruction can save state information for use during the corresponding
XPathException
- if a dynamic error occurspublic void processRight(Stack<XPathContext> contextStack, Stack<Object> state) throws XPathException
processRight
in interface DivisibleInstruction
processRight
in class ElementCreator
contextStack
- the stack of XPath context objects for the current execution statestate
- a stack on which the instruction can save state information for use during the corresponding
XPathException
- if a dynamic error occurspublic void explain(ExpressionPresenter out)
explain
in class Expression
out
- the expression presenter used to display the structure
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