ParentNodeExpression

java.lang.Object
- com.icl.saxon.expr.Expression
- - com.icl.saxon.expr.NodeSetExpression
  - - com.icl.saxon.expr.SingletonExpression
    - - com.icl.saxon.expr.ParentNodeExpression

```
public class ParentNodeExpression
extends SingletonExpression
```
Class ParentNodeExpression represents the XPath expression ".." or "parent::node()"

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

Constructor Summary

Constructors
Constructor Description

ParentNodeExpression()

Constructors
Constructor	Description
`ParentNodeExpression()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`display(int level)`	Diagnostic print of expression structure
`boolean`	`evaluateAsBoolean(Context context)`	Evaluate as a boolean.
`java.lang.String`	`evaluateAsString(Context context)`	Evaluate as a string.
`int`	`getDependencies()`	Determine which aspects of the context the expression depends on.
`NodeInfo`	`getNode(Context context)`	Return the node selected by this SingletonExpression
`Expression`	`reduce(int dependencies, Context context)`	Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

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

Methods inherited from class com.icl.saxon.expr.NodeSetExpression
evaluate, getDataType, outputStringValue

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

Methods inherited from class com.icl.saxon.expr.SingletonExpression
enumerate, evaluateAsNodeSet, isContextDocumentNodeSet, selectFirst

- Constructor Detail
  - ParentNodeExpression
```
public ParentNodeExpression()
```
- Method Detail
  - getNode
```
public NodeInfo getNode(Context context)
                 throws XPathException
```
    Return the node selected by this SingletonExpression
    
    Specified by:
    
    getNode in class SingletonExpression
    
    Parameters:
    
    context - The context for the evaluation
    
    Returns:
    
    the parent of the current node defined by the context
    
    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
  - evaluateAsString
```
public java.lang.String evaluateAsString(Context context)
                                  throws XPathException
```
    Evaluate as a string. Returns the string value of the parent node
    
    Overrides:
    
    evaluateAsString in class SingletonExpression
    
    Parameters:
    
    context - The context in which the expression is to be evaluated
    
    Returns:
    
    the value of the current node, identified by the context
    
    Throws:
    
    XPathException
  - evaluateAsBoolean
```
public boolean evaluateAsBoolean(Context context)
                          throws XPathException
```
    Evaluate as a boolean. Returns true if there are any nodes selected by the NodeSetExpression.
    
    Overrides:
    
    evaluateAsBoolean in class SingletonExpression
    
    Parameters:
    
    context - The context in which the expression is to be evaluated
    
    Returns:
    
    true unless the current node is the Document node
    
    Throws:
    
    XPathException
  - 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
  - display
```
public void display(int level)
```
    Diagnostic print of expression structure
    
    Specified by:
    
    display in class Expression

Class ParentNodeExpression

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

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

Constructor Detail

ParentNodeExpression

Method Detail

getNode

getDependencies

evaluateAsString

evaluateAsBoolean

reduce

display