AppearanceStreamGenerator

All Implemented Interfaces:
```
public interface AppearanceStreamGenerator

                    
```
Interface for custom annotation appearance stream generators.
Instances can be set on Annotation via setAppearanceStreamGenerator to replace default PSPDFKit provided appearance stream.
The annotation will use the first page of the PDF opened from DataProvider returned by getDataProviderForAnnotation as its appearance and this content will be embedded into the PDF.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`public enum`	`AppearanceStreamGenerator.AppearanceStreamGenerationOptions`	Options for appearance stream generation.

Field Summary

Fields
Modifier and Type	Field	Description

Constructor Summary

Constructors
Constructor	Description

Enum Constant Summary

Enum Constants
Enum Constant	Description

Method Summary

Modifier and Type	Method	Description
`abstract DataProvider`	`getDataProviderForAnnotation(@NonNull() Annotation annotation, @NonNull() EnumSet<AppearanceStreamGenerator.AppearanceStreamGenerationOptions> options)`	Called when the appearance stream data for the given annotation is needed.
`abstract boolean`	`shouldUseGeneratorForAnnotation(@NonNull() Annotation annotation)`	Asks the generator whether it should be used to generate the appearance stream for `annotation`.

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

- Constructor Detail
- Method Detail
  - getDataProviderForAnnotation
```
@Nullable() abstract DataProvider getDataProviderForAnnotation(@NonNull() Annotation annotation, @NonNull() EnumSet<AppearanceStreamGenerator.AppearanceStreamGenerationOptions> options)
```
    Called when the appearance stream data for the given annotation is needed.
    The data represented by the DataProvider must be a validly formed PDF. The contents of the first page of that PDF file will be embedded in the annotation as its appearance stream.
    
    Parameters:
    
    annotation - Annotation for which the AP stream is being generated.
    
    options - Enum set of AP stream generation options.
    
    Returns:
    
    DataProvider representing a validly formed PDF or null to use annotation's default AP stream.
  - shouldUseGeneratorForAnnotation
```
 abstract boolean shouldUseGeneratorForAnnotation(@NonNull() Annotation annotation)
```
    Asks the generator whether it should be used to generate the appearance stream for annotation.
    
    Parameters:
    
    annotation - Annotation for which the AP stream is being generated.