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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.Assignation
net.sf.saxon.expr.LetExpression
net.sf.saxon.expr.EagerLetExpression
An EagerLetExpression is the same as a LetExpression except that the variable is evaluated using eager evaluation rather than lazy evaluation. This is used when performing diagnostic tracing.
Field Summary |
Fields inherited from class net.sf.saxon.expr.Assignation |
action, declaration, nameCode, sequence, slotNumber, variableName |
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 | |
EagerLetExpression()
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Method Summary | |
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
Methods inherited from class net.sf.saxon.expr.LetExpression |
checkPermittedContents, computeCardinality, computeSpecialProperties, display, eval, evaluateItem, getItemType, iterate, markTailFunctionCalls, process, processLeavingTail, promote, setIndexedVariable, typeCheck |
Methods inherited from class net.sf.saxon.expr.Assignation |
evaluateVariable, extendBindingList, getAction, getLocalSlotNumber, getRequiredSlots, getSequence, getVariableDeclaration, getVariableFingerprint, getVariableName, getVariableNameCode, isAssignable, isGlobal, iterateSubExpressions, promoteWhereClause, replaceSubExpression, setAction, setSequence, setSlotNumber, setVariableDeclaration, simplify, suppressValidation |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public EagerLetExpression()
Method Detail |
public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException
LetExpression
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 interface Expression
optimize
in class LetExpression
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
XPathException
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