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java.lang.Objectnet.sf.saxon.expr.Expression
net.sf.saxon.expr.UnaryExpression
com.saxonica.expr.CastableToList
public class CastableToList
Expression class for a cast to a List type
| Field Summary |
|---|
| Fields inherited from class net.sf.saxon.expr.UnaryExpression |
|---|
operand |
| Fields inherited from class net.sf.saxon.expr.Expression |
|---|
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 | |
|---|---|
CastableToList(Expression source,
ListType targetType,
boolean allowEmpty)
|
|
| Method Summary | |
|---|---|
int |
computeCardinality()
Get the static cardinality of the expression |
int |
computeSpecialProperties()
Determine the special properties of this expression |
Expression |
copy()
Copy an expression. |
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value of the expression. |
boolean |
equals(Object other)
Is this expression the same as another expression? |
Item |
evaluateItem(XPathContext context)
Evaluate the expression |
void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure. |
ItemType |
getItemType(TypeHierarchy th)
Get the static type of the expression |
NamespaceResolver |
getNamespaceResolver()
|
ListType |
getTargetType()
|
int |
hashCode()
get HashCode for comparing two expressions. |
boolean |
isAllowEmpty()
|
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
Expression |
simplify(ExpressionVisitor visitor)
Simplify the expression |
String |
toString()
The toString() method for an expression attempts to give a representation of the expression in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath. |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.UnaryExpression |
|---|
displayOperator, getBaseExpression, iterateSubExpressions, promote, replaceSubExpression |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public CastableToList(Expression source,
ListType targetType,
boolean allowEmpty)
| Method Detail |
|---|
public boolean isAllowEmpty()
public ListType getTargetType()
public NamespaceResolver getNamespaceResolver()
public Expression simplify(ExpressionVisitor visitor)
throws XPathException
simplify in class UnaryExpressionvisitor - an expression visitor
XPathException - if an error is discovered during expression
rewriting
public Expression typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
throws XPathException
typeCheck in class UnaryExpressionvisitor - 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)
public Expression optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
throws XPathException
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 UnaryExpressionvisitor - 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)public int computeCardinality()
computeCardinality in class UnaryExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic ItemType getItemType(TypeHierarchy th)
getItemType in class UnaryExpressionth - the type hierarchy cache
public int computeSpecialProperties()
computeSpecialProperties in class UnaryExpressionStaticProperty.NON_CREATIVE.public Expression copy()
copy in class Expression
public Item evaluateItem(XPathContext context)
throws XPathException
evaluateItem in class Expressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
public boolean effectiveBooleanValue(XPathContext context)
throws XPathException
Expression
effectiveBooleanValue in class Expressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expressionpublic boolean equals(Object other)
equals in class UnaryExpressionpublic int hashCode()
hashCode in class UnaryExpressionpublic String toString()
toString in class UnaryExpressionpublic void explain(ExpressionPresenter out)
explain in class UnaryExpressionout - the expression presenter used to display the structure
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