Class StringFunction

java.lang.Object
org.jaxen.function.StringFunction
All Implemented Interfaces:
Function

public class StringFunction extends Object implements Function

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.

See Also:
  • Field Details

  • Constructor Details

    • StringFunction

      public StringFunction()
      Create a new StringFunction object.
  • Method Details

    • 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.
      Specified by:
      call in interface Function
      Parameters:
      context - the context at the point in the expression where the function is called
      args - list with zero or one element
      Returns:
      a String
      Throws:
      FunctionCallException - if args has more than one item
    • 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.
      Parameters:
      obj - the node, node-set, string, number, or boolean whose string-value is calculated
      nav - the navigator used to calculate the string-value
      Returns:
      a String. May be empty but is never null.
    • stringValue

      private static String stringValue(double value)
    • stringValue

      private static String stringValue(boolean value)