public class Copy extends ElementCreator
inheritNamespaces, preservingTypes
content, validation
EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD
Constructor and Description |
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Copy(Expression select,
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.
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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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int |
getIntrinsicDependencies()
Determine which aspects of the context the expression depends on.
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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,
NodeInfo copiedNode)
Callback from ElementCreator when constructing an element
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java.lang.String |
getNewBaseURI(XPathContext context,
NodeInfo copiedNode)
Get the base URI of a copied element node (the base URI is retained in the new copy)
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Expression |
getSelectExpression()
Get the expression that selects the node or other item to be copied
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java.util.Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression.
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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,
int nameCode,
NodeInfo copiedNode)
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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void |
processLeft(java.util.Stack<XPathContext> contextStack,
java.util.Stack state)
Process the first half of the instruction in streaming mode
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void |
processRight(java.util.Stack<XPathContext> contextStack,
java.util.Stack state)
Process the second half of the instruction in streaming mode
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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, iterateEvents, processLeavingTail, processLeft, setValidationMode, suppressValidation
addToPathMap, computeCardinality, createsNewNodes, getBaseURI, getCardinality, getContentExpression, getSchemaType, getValidationMode, isLazyConstruction, isNamespaceSensitive, promoteInst, replaceSubExpression, setBaseURI, setContentExpression, setLazyConstruction, setSchemaType, verifyLazyConstruction
assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, process, promote
adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateSameFocusSubExpressions, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, toString, typeError
public Copy(Expression select, boolean copyNamespaces, boolean inheritNamespaces, SchemaType schemaType, int validation)
select
- selects the node (or other item) to be copiedcopyNamespaces
- 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 getSelectExpression()
public 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 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 getIntrinsicDependencies()
getIntrinsicDependencies
in class Expression
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public java.util.Iterator<Expression> iterateSubExpressions()
iterateSubExpressions
in class ParentNodeConstructor
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, NodeInfo copiedNode) throws XPathException
getNameCode
in class ElementCreator
context
- XPath dynamic evaluation contextcopiedNode
- the node being copiedXPathException
public java.lang.String getNewBaseURI(XPathContext context, NodeInfo copiedNode)
getNewBaseURI
in class ElementCreator
context
- XPath dynamic evaluation contextcopiedNode
- protected void outputNamespaceNodes(XPathContext context, Receiver receiver, int 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 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 processLeft(java.util.Stack<XPathContext> contextStack, java.util.Stack 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 correspondingXPathException
public void processRight(java.util.Stack<XPathContext> contextStack, java.util.Stack state) throws XPathException
processRight
in interface DivisibleInstruction
processRight
in class ElementCreator
contextStack
- Stack of XPathContext objects. The instruction should use the one at the top of the stack.state
- a stack on which the instruction can save state information for use during the correspondingXPathException
public void explain(ExpressionPresenter out)
explain
in class Expression
out
- the expression presenter used to display the structure