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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.instruct.Instruction net.sf.saxon.expr.instruct.ParentNodeConstructor
public abstract class ParentNodeConstructor
An abstract class to act as a common parent for instructions that create element nodes and document nodes.
Field Summary | |
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protected Expression |
content
|
protected boolean |
preservingTypes
Flag set to true if validation=preserve and no schema type supplied for validation; also true when validation="strip" if there is no need to physically strip type annotations |
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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ParentNodeConstructor()
Create a document or element node constructor instruction |
Method Summary | |
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PathMap.PathMapNodeSet |
addToPathMap(PathMap pathMap,
PathMap.PathMapNodeSet pathMapNodeSet)
Add a representation of this expression to a PathMap. |
protected abstract void |
checkContentSequence(StaticContext env)
Check that the child instructions don't violate any obvious constraints for this kind of node |
int |
computeCardinality()
Get the cardinality of the sequence returned by evaluating this instruction |
boolean |
createsNewNodes()
Determine whether this instruction creates new nodes. |
String |
getBaseURI()
Get the static base URI of the instruction |
int |
getCardinality()
Determine the static cardinality of the expression. |
Expression |
getContentExpression()
Get the expression that constructs the content of the element |
SchemaType |
getSchemaType()
Get the schema type chosen for validation; null if not defined |
int |
getValidationAction()
Get the validation mode for this instruction |
boolean |
isLazyConstruction()
Establish whether lazy construction is to be used |
boolean |
isNamespaceSensitive()
Determine whether the schema type is namespace sensitive. |
boolean |
isPreservingTypes()
Determine whether this elementCreator performs validation or strips type annotations |
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 |
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 |
void |
setBaseURI(String uri)
Set the static base URI of the instruction |
void |
setContentExpression(Expression content)
Set the expression that constructs the content of the element |
void |
setLazyConstruction(boolean lazy)
Indicate that lazy construction should (or should not) be used. |
void |
setNoNeedToStrip()
Set that the newly constructed node and everything underneath it will automatically be untyped, without any need to physically remove type annotations, even though validation=STRIP is set. |
void |
setSchemaType(SchemaType type)
Set the schema type to be used for validation |
void |
setValidationAction(int mode,
SchemaType schemaType)
Set the validation mode for the new document or element node |
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.Instruction |
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assembleParams, assembleTunnelParams, computeSpecialProperties, dynamicError, evaluateAsString, evaluateItem, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getInstructionNameCode, getItemType, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, process, processLeavingTail, 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 net.sf.saxon.expr.instruct.DivisibleInstruction |
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processLeft, processRight |
Methods inherited from interface javax.xml.transform.SourceLocator |
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getColumnNumber, getLineNumber, getPublicId, getSystemId |
Field Detail |
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protected Expression content
protected boolean preservingTypes
Constructor Detail |
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public ParentNodeConstructor()
Method Detail |
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public void setBaseURI(String uri)
uri
- the static base URIpublic String getBaseURI()
public void setLazyConstruction(boolean lazy)
lazy
- set to true if lazy construction should be usedpublic final boolean isLazyConstruction()
public void setSchemaType(SchemaType type)
type
- the type to be used for validation. (For a document constructor, this is the required
type of the document element)public SchemaType getSchemaType()
getSchemaType
in interface ValidatingInstruction
public boolean isNamespaceSensitive()
public void setValidationAction(int mode, SchemaType schemaType)
mode
- the validation mode, for example Validation.STRICT
schemaType
- the required type (for validation by type). Null if not
validating by typepublic int getValidationAction()
getValidationAction
in interface ValidatingInstruction
Validation.STRICT
or Validation.PRESERVE
public void setNoNeedToStrip()
public void setContentExpression(Expression content)
content
- the content expressionpublic Expression getContentExpression()
getContentExpression
in interface DivisibleInstruction
public int computeCardinality()
computeCardinality
in class Instruction
public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify
in class Instruction
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 Expression
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 abstract void checkContentSequence(StaticContext env) throws XPathException
env
- the static context
XPathException
- if the check failspublic 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 Expression
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
promoteInst
in class Instruction
offer
- The type of rewrite being offered
XPathException
public Iterator<Expression> iterateSubExpressions()
iterateSubExpressions
in class Expression
public boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in class Expression
original
- the original subexpressionreplacement
- the replacement subexpression
public final boolean createsNewNodes()
createsNewNodes
in class Instruction
public int getCardinality()
Expression
getCardinality
in class Expression
public PathMap.PathMapNodeSet addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet)
The default implementation of this method assumes that an expression does no navigation other than the navigation done by evaluating its subexpressions, and that the subexpressions are evaluated in the same context as the containing expression. The method must be overridden for any expression where these assumptions do not hold. For example, implementations exist for AxisExpression, ParentExpression, and RootExpression (because they perform navigation), and for the doc(), document(), and collection() functions because they create a new navigation root. Implementations also exist for PathExpression and FilterExpression because they have subexpressions that are evaluated in a different context from the calling expression.
addToPathMap
in class Expression
pathMap
- the PathMap to which the expression should be addedpathMapNodeSet
- the PathMapNodeSet to which the paths embodied in this expression should be added
public boolean isPreservingTypes()
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