org.jaxen.function
public class BooleanFunction extends Object implements Function
4.3 boolean boolean(object)
The boolean function converts its argument to a boolean as follows:
a number is true if and only if it is neither positive or negative zero nor NaN
a node-set is true if and only if it is non-empty
a string is true if and only if its length is non-zero
an object of a type other than the four basic types is converted to a boolean in a way that is dependent on that type
See Also: Section 4.3 of the XPath Specification
Constructor Summary | |
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BooleanFunction()
Create a new BooleanFunction object. |
Method Summary | |
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Object | call(Context context, List args) Convert the argument to a Boolean
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static Boolean | evaluate(Object obj, Navigator nav) Convert the argument
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BooleanFunction
object.Boolean
Parameters: context the context at the point in the
expression when the function is called args a list with exactly one item which will be converted to a
Boolean
Returns: the result of evaluating the function;
Boolean.TRUE
or Boolean.FALSE
Throws: FunctionCallException if args
has more or less than one item
Convert the argument obj
to a Boolean
according to the following rules:
Parameters: obj the object to convert to a boolean nav ignored
Returns: Boolean.TRUE
or Boolean.FALSE