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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.instruct.Instruction
net.sf.saxon.instruct.ParentNodeConstructor
An abstract class to act as a common parent for instructions that create element nodes and document nodes.
Field Summary | |
protected Expression |
content
|
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
ParentNodeConstructor()
|
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
boolean |
createsNewNodes()
Determine whether this instruction creates new nodes. |
int |
getCardinality()
Determine the static cardinality of the expression. |
Expression |
getContentExpression()
Get the expression that constructs the content of the element |
int |
getValidationAction()
Get the validation mode for this instruction |
boolean |
isLazyConstruction()
Establish whether lazy construction is to be used |
java.util.Iterator |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites. |
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 |
Expression |
simplify(StaticContext env)
Simplify an expression. |
Methods inherited from class net.sf.saxon.instruct.Instruction |
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getImplementationMethod, getInstructionInfo, getInstructionNameCode, getItemType, getSourceLocator, isXSLT, iterate, process, processLeavingTail, promote |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface javax.xml.transform.SourceLocator |
getColumnNumber, getLineNumber, getPublicId, getSystemId |
Methods inherited from interface net.sf.saxon.expr.Expression |
display |
Field Detail |
protected Expression content
Constructor Detail |
public ParentNodeConstructor()
Method Detail |
public void setLazyConstruction(boolean lazy)
lazy
- set to true if lazy construction should be usedpublic final boolean isLazyConstruction()
public int getValidationAction()
Validation.STRICT
or Validation.PRESERVE
public void setContentExpression(Expression content)
public Expression getContentExpression()
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class Instruction
XPathException
- if an error is discovered during expression rewritingpublic Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
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 will only be accurately known if they have been explicitly declared.
analyze
in interface Expression
analyze
in class Instruction
env
- the static context of the expression
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 java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public final boolean createsNewNodes()
createsNewNodes
in class Instruction
public int getCardinality()
ComputedExpression
getCardinality
in interface Expression
getCardinality
in class ComputedExpression
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