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## org.apache.fop.fo.expr
Class FunctionBase

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

All Implemented Interfaces:
  Function

Direct Known Subclasses:
  AbsFunction, BodyStartFunction, FromNearestSpecifiedValueFunction, FromParentFunction, FromTableColumnFunction, InheritedPropFunction, LabelEndFunction, MaxFunction, MinFunction, ProportionalColumnWidthFunction

    public abstract class FunctionBase

extends java.lang.Object
implements Function

Abstract Base class for XSL-FO functions

Constructor Summary
`FunctionBase()`

Method Summary
`Property` | `getOptionalArgDefault(int index, PropertyInfo pi)`
`int` | `getOptionalArgsCount()`
`PercentBase` | `getPercentBase()`
`protected Property` | `getPropertyName(PropertyInfo pi)`
`boolean` | `hasVariableArgs()` Determine if function allows variable arguments.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.apache.fop.fo.expr.Function
`eval, getRequiredArgsCount`

Constructor Detail

### FunctionBase

    public FunctionBase()

Method Detail

### getOptionalArgsCount

    public int getOptionalArgsCount()

  Specified by:
    `getOptionalArgsCount` in interface `Function`
  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

  Specified by:
    `getOptionalArgDefault` in interface `Function`
  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

### hasVariableArgs

    public boolean hasVariableArgs()

  Determine if function allows variable arguments. If it does, then they must appear after required and optional arguments, and all optional arguments must be specified.

  Specified by:
    `hasVariableArgs` in interface `Function`
  Returns:
    true if function permits additional variable number of arguments after required and (completely specified) optional arguments

### getPercentBase

    public PercentBase getPercentBase()

  Specified by:
    `getPercentBase` in interface `Function`
  Returns:
    the basis for percentage calculations

### getPropertyName

    protected final Property getPropertyName(PropertyInfo pi)

  Parameters:
    `pi` - property information instance that applies to property being evaluated
  Returns:
    string property whose value is name of property being evaluated

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