net.sf.saxon.functions
Class Subsequence
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.Subsequence
- All Implemented Interfaces:
- Serializable, Expression
public class Subsequence
- extends SystemFunction
Implements the XPath 2.0 subsequence() function
- See Also:
- Serialized Form
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SUBSEQUENCE
public static final int SUBSEQUENCE
- See Also:
- Constant Field Values
Subsequence
public Subsequence()
getItemType
public ItemType getItemType()
- Determine the data type of the items in the sequence
- Specified by:
getItemType
in interface Expression
- Overrides:
getItemType
in class SystemFunction
- Returns:
- the type of the argument
computeSpecialProperties
public int computeSpecialProperties()
- Get the static properties of this expression (other than its type). The result is
bit-significant. These properties are used for optimizations. In general, if
property bit is set, it is true, but if it is unset, the value is unknown.
- Overrides:
computeSpecialProperties
in class ComputedExpression
iterate
public SequenceIterator iterate(XPathContext context)
throws XPathException
- Evaluate the function to return an iteration of selected nodes.
- Specified by:
iterate
in interface Expression
- Overrides:
iterate
in class ComputedExpression
- Parameters:
context
- supplies the context for evaluation
- Returns:
- a SequenceIterator that can be used to iterate over the result
of the expression
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression