```
public interface ContentFunction
```
Interface for objects which implement a function which creates content (e.g. counter(pages))

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`calculate(LayoutContext c, FSFunction function)`
`java.lang.String`	`calculate(RenderingContext c, FSFunction function, InlineText text)`
`boolean`	`canHandle(LayoutContext c, FSFunction function)`
`java.lang.String`	`getLayoutReplacementText()`	If a function value can change at render time (i.e.
`boolean`	`isStatic()`	Whether or not the function value can change at render time.

isStatic
```
boolean isStatic()
```
Whether or not the function value can change at render time. If true, #calculate(LayoutContext, String, TextContent) will be called. If false, #calculate(RenderingContext, String, TextContent) will be called.

java.lang.String calculate(LayoutContext c,
                           FSFunction function)

java.lang.String calculate(RenderingContext c,
                           FSFunction function,
                           InlineText text)

getLayoutReplacementText
```
java.lang.String getLayoutReplacementText()
```
If a function value can change at render time (i.e. isStatic() returns false) use this text as an approximation at layout.

boolean canHandle(LayoutContext c,
                  FSFunction function)

Interface ContentFunction