public class CopyOf extends Instruction
locationId, staticProperties
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
Constructor and Description |
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CopyOf(Expression select,
boolean copyNamespaces,
int validation,
SchemaType schemaType,
boolean rejectDuplicatAttributes) |
Modifier and Type | Method and Description |
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(package private) static void |
copyAttribute(NodeInfo source,
SchemaType schemaType,
int validation,
Instruction instruction,
XPathContext context,
boolean rejectDuplicates)
Method shared by xsl:copy and xsl:copy-of to copy an attribute node
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boolean |
createsNewNodes()
Determine whether this instruction creates new nodes.
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void |
display(int level,
java.io.PrintStream out,
Configuration config)
Diagnostic print of expression structure.
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Item |
evaluateItem(XPathContext context)
Return the first item if there is one, or null if not
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int |
getCardinality()
Determine the static cardinality of the expression.
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int |
getDependencies()
Determine which aspects of the context the expression depends on.
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int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
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int |
getInstructionNameCode()
Get the name of this instruction, for diagnostics and tracing
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ItemType |
getItemType(TypeHierarchy th)
Get the item type of the items returned by evaluating this instruction
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SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence.
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java.util.Iterator |
iterateSubExpressions()
Get the immediate sub-expressions of this expression.
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Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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TailCall |
processLeavingTail(XPathContext context)
Process this xsl:copy-of instruction
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protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites.
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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void |
setReadOnce(boolean b) |
void |
setRequireDocumentOrElement(boolean requireDocumentOrElement)
For XQuery, the operand (select) must be a single element or document node.
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Expression |
simplify(StaticContext env)
Simplify an expression.
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Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Perform type checking of an expression and its subexpressions.
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appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, evaluateAsString, getInstructionInfo, getSourceLocator, isXSLT, process, promote
adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, getColumnNumber, getConstructType, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation, typeError
public CopyOf(Expression select, boolean copyNamespaces, int validation, SchemaType schemaType, boolean rejectDuplicatAttributes)
public void setReadOnce(boolean b)
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 interface TailCallReturner
processLeavingTail
in class Instruction
context
- the dynamic context for the transformationXPathException
static void copyAttribute(NodeInfo source, SchemaType schemaType, int validation, Instruction instruction, XPathContext context, boolean rejectDuplicates) throws XPathException
source
- the node to be copiedschemaType
- the simple type against which the value is to be validated, if anyvalidation
- one of preserve, strip, strict, laxinstruction
- the calling instruction, used for diagnosticscontext
- the dynamic contextrejectDuplicates
- true if duplicate attributes with the same name are disallowed (XQuery)XPathException
public Expression simplify(StaticContext env) throws XPathException
Instruction
simplify
in interface Expression
simplify
in class Instruction
env
- the static contextXPathException
- if an error is discovered during expression
rewritingpublic ItemType getItemType(TypeHierarchy th)
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 offeredXPathException
public Expression typeCheck(StaticContext env, 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.
env
- the static context of the expressioncontextItemType
- 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
StaticError
- if an error is discovered during this phase
(typically a type error)XPathException
public Expression optimize(Optimizer opt, StaticContext env, 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.
opt
- the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.env
- the static context of the expressioncontextItemType
- 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
StaticError
- if an error is discovered during this phase
(typically a type error)XPathException
public void display(int level, java.io.PrintStream out, Configuration config)
level
- indentation level for this expressionout
- config
- public java.util.Iterator iterateSubExpressions()
ComputedExpression
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in interface Container
replaceSubExpression
in class ComputedExpression
original
- the original subexpressionreplacement
- the replacement subexpressionpublic 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 evaluationXPathException
- if any dynamic error occurs evaluating the
expression