org.jaxen.function
Class StringFunction
java.lang.Object
org.jaxen.function.StringFunction
- Function
public class StringFunction
extends java.lang.Object
4.2 string string(object)
The string function converts
an object to a string as follows:
-
A node-set is converted to a string by returning the string-value of the node in the node-set
that is first in document order. If
the node-set is empty, an empty string is returned.
-
A number is converted to a string as follows
-
NaN is converted to the string
NaN
-
positive zero is converted to the string
0
-
negative zero is converted to the string
0
-
positive infinity is converted to the string
Infinity
-
negative infinity is converted to the string
-Infinity
-
if the number is an integer, the number is represented in decimal
form as a Number with no decimal point and
no leading zeros, preceded by a minus sign (
-
) if
the number is negative
-
otherwise, the number is represented in decimal form as a Number including a decimal point with at least
one digit before the decimal point and at least one digit after the
decimal point, preceded by a minus sign (
-
) if the
number is negative; there must be no leading zeros before the decimal
point apart possibly from the one required digit immediately before
the decimal point; beyond the one required digit after the decimal
point there must be as many, but only as many, more digits as are
needed to uniquely distinguish the number from all other IEEE 754
numeric values.
The boolean false value is converted to the string false
.
The boolean true value is converted to the string true
.
An object of a type other than the four basic types is converted to a
string in a way that is dependent on that type.
If the argument is omitted, it defaults to a node-set with the
context node as its only member.
- bob mcwhirter (bob @ werken.com)
private static DecimalFormat | format
|
Object | call(Context context, List args) - Returns the string-value of
args.get(0)
or of the context node if args is empty.
|
static String | evaluate(Object obj, Navigator nav) - Returns the XPath string-value of
obj .
|
private static String | stringValue(boolean value)
|
private static String | stringValue(double value)
|
format
private static DecimalFormat format
StringFunction
public StringFunction()
Create a new StringFunction
object.
call
public Object call(Context context,
List args)
throws FunctionCallException
Returns the string-value of args.get(0)
or of the context node if args
is empty.
- call in interface Function
context
- the context at the point in the
expression where the function is calledargs
- list with zero or one element
evaluate
public static String evaluate(Object obj,
Navigator nav)
Returns the XPath string-value of obj
.
This operation is only defined if obj is a node, node-set,
String
, Number
, or
Boolean
. For other types this function
returns the empty string.
obj
- the node, node-set, string, number, or boolean
whose string-value is calculatednav
- the navigator used to calculate the string-value
- a
String
. May be empty but is never null.
stringValue
private static String stringValue(boolean value)
stringValue
private static String stringValue(double value)