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java.lang.Object
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+--net.sf.saxon.value.Value
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+--net.sf.saxon.value.SequenceValue
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+--net.sf.saxon.value.EmptySequence
An EmptySequence object represents a sequence containing no members.
| Field Summary |
| Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
| Method Summary | |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value - always false |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
int |
getCardinality()
Determine the static cardinality |
static EmptySequence |
getInstance()
Get the implicit instance of this class |
ItemType |
getItemType()
Determine the item type |
int |
getSpecialProperties()
Get the static properties of this expression (other than its type). |
int |
hashCode()
Return a hash code to support the equals() function |
SequenceIterator |
iterate(XPathContext context)
Return an iteration over the sequence |
| Methods inherited from class net.sf.saxon.value.SequenceValue |
convertToJava, evaluateAsString, evaluateItem, getImplementationMethod, getStringValue, itemAt, materialize, process |
| Methods inherited from class net.sf.saxon.value.Value |
analyze, asItem, asValue, collapseWhitespace, convertJavaObjectToXPath, getDependencies, getParentExpression, inverse, iterateSubExpressions, normalizeWhitespace, promote, simplify, stringToNumber, toString, trimWhitespace |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Method Detail |
public static EmptySequence getInstance()
public SequenceIterator iterate(XPathContext context)
throws XPathException
context - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expressionpublic ItemType getItemType()
getItemType in interface ExpressiongetItemType in class SequenceValuepublic int getCardinality()
getCardinality in interface ExpressiongetCardinality in class SequenceValuepublic int getSpecialProperties()
getSpecialProperties in interface ExpressiongetSpecialProperties in class Valuepublic boolean equals(java.lang.Object other)
equals in class SequenceValuejava.lang.ClassCastException - if the values are not comparablepublic int hashCode()
SequenceValue
hashCode in class SequenceValuepublic boolean effectiveBooleanValue(XPathContext context)
effectiveBooleanValue in interface ExpressioneffectiveBooleanValue in class SequenceValuecontext - The context in which the expression is to be evaluated
public void display(int level,
NamePool pool,
java.io.PrintStream out)
display in interface Expressiondisplay in class SequenceValuelevel - indentation level for this expressionpool - NamePool used to expand any names appearing in the expressionout - Output destination
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