org.apache.xpath.objects

Class XNull

public class XNull extends XNodeSet

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

UNKNOWN: general

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.
String	getTypeString() Given a request type, return the equivalent string.
double	num() Cast result object to a number.
int	rtf(XPathContext support) Cast result object to a result tree fragment.
String	str() Cast result object to a string.

Constructor Detail

XNull

public XNull()

Create an XObject.

Method Detail

bool

public boolean bool()

Cast result object to a boolean.

Returns: false

equals

public boolean equals(XObject obj2)

Tell if two objects are functionally equal.

Parameters: obj2 Object to compare this to

Returns: True if the given object is of type CLASS_NULL

getType

public int getType()

Tell what kind of class this is.

Returns: type CLASS_NULL

getTypeString

public String getTypeString()

Given a request type, return the equivalent string. For diagnostic purposes.

Returns: type string "#CLASS_NULL"

num

public double num()

Cast result object to a number.

Returns: 0.0

rtf

public int rtf(XPathContext support)

Cast result object to a result tree fragment.

Parameters: support XPath context to use for the conversion

Returns: The object as a result tree fragment.

str

public String str()

Cast result object to a string.

Returns: empty string ""

Copyright B) 2005 Apache XML Project. All Rights Reserved.