org.apache.xpath.objects
Class XNull
java.lang.Object
|
+--org.apache.xpath.Expression
|
+--org.apache.xpath.objects.XObject
|
+--org.apache.xpath.axes.NodeSequence
|
+--org.apache.xpath.objects.XNodeSet
|
+--org.apache.xpath.objects.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.
- See Also:
- Serialized Form
- Usage:
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. |
double |
num()
Cast result object to a number. |
int |
rtf(XPathContext 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.XNodeSet |
appendToFsb,
boolWithSideEffects,
compare,
dispatchCharactersEvents,
getFresh,
getNumberFromNode,
getStringFromNode,
greaterThan,
greaterThanOrEqual,
iter,
iterRaw,
lessThan,
lessThanOrEqual,
mutableNodeset,
nodelist,
nodeset,
notEquals,
numWithSideEffects,
object,
release,
xstr |
Methods inherited from class org.apache.xpath.axes.NodeSequence |
allowDetachToRelease,
clone,
cloneWithReset,
detach,
fixupVariables,
getAnalysisBits,
getAxis,
getContainedIter,
getCurrentNode,
getCurrentPos,
getDTM,
getDTMManager,
getExpandEntityReferences,
getLength,
getRoot,
getWhatToShow,
hasCache,
isDocOrdered,
isFresh,
isMutable,
item,
nextNode,
previousNode,
reset,
runTo,
setCurrentPos,
setItem,
setIter,
setRoot,
setShouldCacheNodes |
Methods inherited from class org.apache.xpath.objects.XObject |
callVisitors,
castToType,
create,
create,
deepEquals,
destruct,
execute,
rtf,
rtree,
rtree,
toString |
Methods inherited from class org.apache.xpath.Expression |
asIterator,
asIteratorRaw,
asNode,
assertion,
bool,
canTraverseOutsideSubtree,
error,
execute,
execute,
execute,
executeCharsToContentHandler,
exprAddChild,
exprGetChild,
exprGetNumChildren,
exprGetParent,
exprSetParent,
getColumnNumber,
getExpressionOwner,
getLineNumber,
getPublicId,
getSystemId,
isNodesetExpr,
isStableNumber,
num,
warn,
xstr |
Methods inherited from class java.lang.Object |
equals,
getClass,
hashCode,
notify,
notifyAll,
wait,
wait,
wait |
XNull
public XNull()
- Create an XObject.
getType
public int getType()
- Tell what kind of class this is.
- Returns:
- type CLASS_NULL
- Overrides:
- getType in class XNodeSet
getTypeString
public java.lang.String getTypeString()
- Given a request type, return the equivalent string.
For diagnostic purposes.
- Returns:
- type string "#CLASS_NULL"
- Overrides:
- getTypeString in class XNodeSet
num
public double num()
- Cast result object to a number.
- Returns:
- 0.0
- Overrides:
- num in class XNodeSet
bool
public boolean bool()
- Cast result object to a boolean.
- Returns:
- false
- Overrides:
- bool in class XNodeSet
str
public java.lang.String str()
- Cast result object to a string.
- Returns:
- empty string ""
- Overrides:
- str in class XNodeSet
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.
- Overrides:
- rtf in class XObject
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
- Overrides:
- equals in class XNodeSet
Copyright © 2005 Apache XML Project. All Rights Reserved.