public class Copy extends ElementCreator
inheritNamespaces, preservingTypes
content
EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
Constructor and Description |
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Copy(boolean copyNamespaces,
boolean inheritNamespaces,
SchemaType schemaType,
int validation)
Create a shallow copy instruction
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Modifier and Type | Method and Description |
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Expression |
copy()
Copy an expression.
|
Item |
evaluateItem(XPathContext context)
Evaluate as an expression.
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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int[] |
getActiveNamespaces()
Callback to get a list of the intrinsic namespaces that need to be generated for the element.
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int |
getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes
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ItemType |
getItemType(TypeHierarchy th)
Get the item type of the result of this instruction.
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int |
getNameCode(XPathContext context)
Callback from ElementCreator when constructing an element
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java.lang.String |
getNewBaseURI(XPathContext context)
Get the base URI of a copied element node (the base URI is retained in the new copy)
|
Expression |
optimize(ExpressionVisitor visitor,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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protected void |
outputNamespaceNodes(XPathContext context,
Receiver receiver)
Callback to output namespace nodes for the new element.
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TailCall |
processLeavingTail(XPathContext context)
Evaluate the instruction to produce a new element node.
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Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression.
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Expression |
typeCheck(ExpressionVisitor visitor,
ItemType contextItemType)
Perform type checking of an expression and its subexpressions.
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checkContentSequence, computeSpecialProperties, getImplementationMethod, isInheritNamespaces, isPreservingTypes, iterateEvents, setValidationMode, suppressValidation
addToPathMap, computeCardinality, createsNewNodes, getBaseURI, getCardinality, getContentExpression, getSchemaType, getValidationMode, isLazyConstruction, isNamespaceSensitive, iterateSubExpressions, promoteInst, replaceSubExpression, setBaseURI, setContentExpression, setLazyConstruction, setSchemaType
assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getSourceLocator, isXSLT, iterate, process, promote
adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, display, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, findParentOf, getColumnNumber, getColumnNumber, getContainer, getDependencies, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isUpdatingExpression, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, staticTypeCheck, toString, typeError
public Copy(boolean copyNamespaces, boolean inheritNamespaces, SchemaType schemaType, int validation)
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 modepublic Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify
in class ParentNodeConstructor
visitor
- an expression visitorXPathException
- if an error is discovered during expression rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ItemType 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 parent pointer and 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 int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public ItemType getItemType(TypeHierarchy th)
getItemType
in class ElementCreator
th
- the type hierarchy cachepublic Expression optimize(ExpressionVisitor visitor, ItemType 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)public int getNameCode(XPathContext context) throws XPathException
getNameCode
in class ElementCreator
context
- XPath dynamic evaluation contextXPathException
public java.lang.String getNewBaseURI(XPathContext context)
getNewBaseURI
in class ElementCreator
context
- XPath dynamic evaluation contextprotected void outputNamespaceNodes(XPathContext context, Receiver receiver) throws XPathException
outputNamespaceNodes
in class ElementCreator
context
- The execution contextreceiver
- the Receiver where the namespace nodes are to be writtenXPathException
public int[] getActiveNamespaces() throws XPathException
getActiveNamespaces
in class ElementCreator
XPathException
public TailCall processLeavingTail(XPathContext context) throws XPathException
ElementCreator
processLeavingTail
in interface TailCallReturner
processLeavingTail
in class ElementCreator
context
- XPath dynamic evaluation contextXPathException
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface EvaluableItem
evaluateItem
in class ElementCreator
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic void explain(ExpressionPresenter out)
explain
in class Expression
out
- the expression presenter used to display the structure