org.apache.xalan.xpath
Class XNull

java.lang.Object
  |
  +--org.apache.xpath.Expression
        |
        +--org.apache.xpath.objects.XObject
              |
              +--org.apache.xalan.xpath.XObject
                    |
                    +--org.apache.xalan.xpath.XNull

public class XNull
extends XObject

This class represents an XPath null object, and is capable of converting the null to other types, such as a string.

See Also:
Serialized Form

Fields inherited from class org.apache.xpath.objects.XObject
CLASS_BOOLEAN, CLASS_NODESET, CLASS_NULL, CLASS_NUMBER, CLASS_RTREEFRAG, CLASS_STRING, CLASS_UNKNOWN, CLASS_UNRESOLVEDVARIABLE
 
Constructor Summary
XNull()
          Create an XObject.
 
Method Summary
 boolean bool()
          Cast result object to a boolean.
 boolean equals(XObject obj2)
          Tell if two objects are functionally equal.
 int getType()
          Tell what kind of class this is.
 java.lang.String getTypeString()
          Given a request type, return the equivalent string.
 org.w3c.dom.traversal.NodeIterator nodeset()
          Cast result object to a nodelist.
 double num()
          Cast result object to a number.
 org.w3c.dom.DocumentFragment rtree(org.apache.xpath.XPathContext support)
          Cast result object to a result tree fragment.
 org.w3c.dom.DocumentFragment rtree(XPathSupport support)
          Cast result object to a result tree fragment.
 java.lang.String str()
          Cast result object to a string.
 
Methods inherited from class org.apache.xpath.objects.XObject
castToType, create, equals, execute, greaterThan, greaterThanOrEqual, lessThan, lessThanOrEqual, mutableNodeset, notEquals, object, rtree, toString
 
Methods inherited from class org.apache.xpath.Expression
assertion, canTraverseOutsideSubtree, error, setSourceLocator, warn
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

XNull

public XNull()
Create an XObject.
Method Detail

getType

public int getType()
Tell what kind of class this is.
Overrides:
getType in class org.apache.xpath.objects.XObject

getTypeString

public java.lang.String getTypeString()
Given a request type, return the equivalent string. For diagnostic purposes.
Overrides:
getTypeString in class org.apache.xpath.objects.XObject

num

public double num()
Cast result object to a number.
Overrides:
num in class org.apache.xpath.objects.XObject

bool

public boolean bool()
Cast result object to a boolean.
Overrides:
bool in class org.apache.xpath.objects.XObject

str

public java.lang.String str()
Cast result object to a string.
Overrides:
str in class org.apache.xpath.objects.XObject

rtree

public org.w3c.dom.DocumentFragment rtree(XPathSupport support)
Cast result object to a result tree fragment.

rtree

public org.w3c.dom.DocumentFragment rtree(org.apache.xpath.XPathContext support)
Cast result object to a result tree fragment.
Overrides:
rtree in class org.apache.xpath.objects.XObject
Parameters:
support - XPath context to use for the conversion
Returns:
The object as a result tree fragment.

nodeset

public org.w3c.dom.traversal.NodeIterator nodeset()
Cast result object to a nodelist.
Overrides:
nodeset in class org.apache.xpath.objects.XObject

equals

public boolean equals(XObject obj2)
Tell if two objects are functionally equal.


Copyright © 2000 Apache XML Project. All Rights Reserved.