net.sf.saxon.functions
Class Concat
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.Concat
- All Implemented Interfaces:
- Expression, Serializable
- public class Concat
- extends SystemFunction
- See Also:
- Serialized Form
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Concat
public Concat()
getRequiredType
protected SequenceType getRequiredType(int arg)
- Get the required type of the nth argument
- Overrides:
getRequiredType
in class SystemFunction
evaluateAsString
public String evaluateAsString(XPathContext c)
throws XPathException
- Evaluate the function in a string context
- Specified by:
evaluateAsString
in interface Expression
- Overrides:
evaluateAsString
in class ComputedExpression
- Parameters:
c
- The context in which the expression is to be evaluated
- Returns:
- the value of the expression, evaluated in the current context.
The expression must return a string or (); if the value of the
expression is (), this method returns "".
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression
evaluateItem
public Item evaluateItem(XPathContext c)
throws XPathException
- Evaluate in a general context
- Specified by:
evaluateItem
in interface Expression
- Overrides:
evaluateItem
in class ComputedExpression
- Parameters:
c
- The context in which the expression is to be evaluated
- Returns:
- the node or atomic value that results from evaluating the
expression; or null to indicate that the result is an empty
sequence
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression