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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.UnaryExpression net.sf.saxon.expr.NegateExpression
public class NegateExpression
Negate Expression: implements the unary minus operator. This expression is initially created as an ArithmeticExpression (or in backwards compatibility mode, an ArithmeticExpression10) to take advantage of the type checking code. So we don't need to worry about type checking or argument conversion.
Field Summary |
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Fields inherited from class net.sf.saxon.expr.UnaryExpression |
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operand |
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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NegateExpression(Expression base)
Create a NegateExpression |
Method Summary | |
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Expression |
copy()
Copy an expression. |
protected String |
displayOperator(Configuration config)
Give a string representation of the operator for use in diagnostics |
Item |
evaluateItem(XPathContext context)
Evaluate the expression. |
String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user. |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if this is known statically |
boolean |
isBackwardsCompatible()
Ask whether the expression is to be evaluated in XPath 1.0 compatibility mode |
void |
setBackwardsCompatible(boolean compatible)
Set whether the expression is to be evaluated in XPath 1.0 compatibility mode |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression. |
Methods inherited from class net.sf.saxon.expr.UnaryExpression |
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computeCardinality, computeSpecialProperties, equals, explain, getBaseExpression, hashCode, iterateSubExpressions, optimize, promote, replaceSubExpression, simplify, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public NegateExpression(Expression base)
base
- the expression that computes the value whose sign is to be reversedMethod Detail |
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public void setBackwardsCompatible(boolean compatible)
compatible
- true if XPath 1.0 compatibility mode is enabledpublic boolean isBackwardsCompatible()
public Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
UnaryExpression
typeCheck
in class UnaryExpression
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)public ItemType getItemType(TypeHierarchy th)
getItemType
in class UnaryExpression
th
- the type hierarchy cache
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in class Expression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic Expression copy()
copy
in class Expression
protected String displayOperator(Configuration config)
UnaryExpression
displayOperator
in class UnaryExpression
config
- the Saxon configuration
public String getExpressionName()
getExpressionName
in class Expression
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