org.apache.fop.fo.expr

## Class FromParentFunction

- java.lang.Object
- - org.apache.fop.fo.expr.FunctionBase
  - - org.apache.fop.fo.expr.FromParentFunction

- All Implemented Interfaces:
    Function

      public class FromParentFunction
      extends FunctionBase

  Class modelling the from-parent Property Value function. See Sec. 5.10.4 of the XSL-FO spec.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `FromParentFunction()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Property` | `eval(Property[] args, PropertyInfo pInfo)` Evaluate the function
    `Property` | `getOptionalArgDefault(int index, PropertyInfo pi)`
    `int` | `getOptionalArgsCount()`
    `int` | `getRequiredArgsCount()`

    - ### Methods inherited from class org.apache.fop.fo.expr.FunctionBase

      `getPercentBase, getPropertyName, hasVariableArgs`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### FromParentFunction

          public FromParentFunction()

  - ### Method Detail

    - #### getRequiredArgsCount

          public int getRequiredArgsCount()

      Returns:
        the number of required (non-optional) arguments that must be specified in the argument list

    - #### getOptionalArgsCount

          public int getOptionalArgsCount()

      Description copied from class: `FunctionBase`
      Specified by:
        `getOptionalArgsCount` in interface `Function`
      Overrides:
        `getOptionalArgsCount` in class `FunctionBase`
      Returns:
        the number of non-required (optional) arguments that may be specified in the argument list, which, if specified, must follow the required arguments

    - #### getOptionalArgDefault

          public Property getOptionalArgDefault(int index,
                                                PropertyInfo pi)
                                         throws PropertyException

      Description copied from class: `FunctionBase`
      Specified by:
        `getOptionalArgDefault` in interface `Function`
      Overrides:
        `getOptionalArgDefault` in class `FunctionBase`
      Parameters:
        `index` - of optional argument
        `pi` - property information instance that applies to property being evaluated
      Returns:
        the default property value for the optional argument at INDEX, where INDEX is with respect to optional arguments; i.e., the first optional argument position is index 0; if no default for a given index, then null is returned
      Throws:
        `PropertyException` - if index is greater than or equal to optional args count

    - #### eval

          public Property eval(Property[] args,
                               PropertyInfo pInfo)
                        throws PropertyException

      Evaluate the function
      Parameters:
        `args` - an array of Properties that should be evaluated
        `pInfo` - property information instance that applies to property being evaluated
      Returns:
        the Property satisfying the function
      Throws:
        `PropertyException` - for problems when evaluating the function

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