NodeListExpression

java.lang.Object
- com.icl.saxon.expr.Expression
- - com.icl.saxon.expr.NodeSetExpression
  - - com.icl.saxon.expr.NodeListExpression

```
public class NodeListExpression
extends NodeSetExpression
```
A NodeListExpression is an expression denoting a set of nodes sorted in document order.
It is not possible to write a NodeListExpression directly using XPath; however a node set expression is treated as a NodeListExpression when it appears in certain contexts, specifically the select attribute of xsl:apply-templates or xsl:for-each.

Field Summary
- Fields inherited from class com.icl.saxon.expr.Expression
  staticContext

Constructor Summary

Constructors
Constructor Description

NodeListExpression(Expression exp)
Constructor

Constructors
Constructor	Description
`NodeListExpression(Expression exp)`	Constructor

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`display(int level)`	Diagnostic print of expression structure
`NodeEnumeration`	`enumerate(Context c, boolean sort)`	Return an enumeration that returns the nodes in document order
`int`	`getDependencies()`	Determine which aspects of the context the expression depends on.
`Expression`	`reduce(int dependencies, Context context)`	Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
`Expression`	`simplify()`	Simplify the expression

Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, evaluateAsNumber, getStaticContext, indent, isContextDocumentNodeSet, make, setStaticContext, usesCurrent

Methods inherited from class com.icl.saxon.expr.NodeSetExpression
evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getDataType, outputStringValue, selectFirst

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - NodeListExpression
```
public NodeListExpression(Expression exp)
```
    Constructor
    
    Parameters:
    
    exp - The expression that delivers the unsorted node-set
- Method Detail
  - simplify
```
public Expression simplify()
                    throws XPathException
```
    Simplify the expression
    
    Overrides:
    
    simplify in class Expression
    
    Returns:
    
    the simplified expression
    
    Throws:
    
    XPathException
  - getDependencies
```
public int getDependencies()
```
    Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE
    
    Specified by:
    
    getDependencies in class Expression
  - reduce
```
public Expression reduce(int dependencies,
                         Context context)
                  throws XPathException
```
    Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
    
    Specified by:
    
    reduce in class Expression
    
    Parameters:
    
    dependencies - The dependencies to be removed
    
    context - The context to be used for the partial evaluation
    
    Returns:
    
    a new expression that does not have any of the specified dependencies
    
    Throws:
    
    XPathException
  - enumerate
```
public NodeEnumeration enumerate(Context c,
                                 boolean sort)
                          throws XPathException
```
    Return an enumeration that returns the nodes in document order
    
    Specified by:
    
    enumerate in class NodeSetExpression
    
    Parameters:
    
    c - the evaluation context
    
    sort - : ignored, this class is used because the enumeration is always in document order
    
    Throws:
    
    XPathException - when the expression does not return a nodeset.
  - display
```
public void display(int level)
```
    Diagnostic print of expression structure
    
    Specified by:
    
    display in class Expression

Class NodeListExpression

Field Summary

Fields inherited from class com.icl.saxon.expr.Expression

Constructor Summary

Method Summary

Methods inherited from class com.icl.saxon.expr.Expression

Methods inherited from class com.icl.saxon.expr.NodeSetExpression

Methods inherited from class java.lang.Object

Constructor Detail

NodeListExpression

Method Detail

simplify

getDependencies

reduce

enumerate

display