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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.UnaryExpression | +--net.sf.saxon.expr.ConvertToString
A ConvertToString expression performs the string conversion required for string arguments in backwards compatibility mode. If given an empty sequence, it returns an empty string; otherwise, it returns the string value of the first item in the sequence.
Field Summary |
Fields inherited from class net.sf.saxon.expr.UnaryExpression |
operand |
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 | |
ConvertToString(Expression base)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Get the static cardinality |
java.lang.String |
displayOperator(NamePool pool)
Diagnostic print of expression structure |
Item |
evaluateItem(XPathContext context)
Evaluate the expression |
ItemType |
getItemType()
Get the data type of the items returned |
Methods inherited from class net.sf.saxon.expr.UnaryExpression |
computeSpecialProperties, display, equals, getBaseExpression, hashCode, iterateSubExpressions, promote, simplify |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ConvertToString(Expression base)
base
- A sequence expression denoting sequence whose first item is to be returnedMethod Detail |
public ItemType getItemType()
getItemType
in interface Expression
getItemType
in class UnaryExpression
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
analyze
in interface Expression
analyze
in class UnaryExpression
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
public int computeCardinality()
computeCardinality
in class UnaryExpression
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic java.lang.String displayOperator(NamePool pool)
displayOperator
in class UnaryExpression
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