COSNull (com.pd4ml 4.1.1 API Documentation)

java.lang.Object
- com.pd4ml.pdf.cos.COSBase
- - com.pd4ml.pdf.cos.COSNull

All Implemented Interfaces:

COSObjectable
```
public final class COSNull
extends COSBase
```
The PDF null object. Also used by this API as the well-defined result of a failed/absent lookup (e.g. a dictionary key that isn't present, or a COS path that cannot be resolved), instead of a bare Java null, so callers can keep chaining without a null check at every step.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static COSNull NULL
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  <T> T accept(ICOSVisitor<T> visitor)
  
  java.lang.String toString()
  - Methods inherited from class com.pd4ml.pdf.cos.COSBase
    getCOSObject, getGenerationNumber, getKey, getObjectNumber, isDirect, resolve, setKey
  - Methods inherited from class java.lang.Object
    equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail
- NULL
```
public static final COSNull NULL
```

Method Detail
- toString
```
public java.lang.String toString()
```
  Overrides:
  
  toString in class java.lang.Object
- accept
```
public <T> T accept(ICOSVisitor<T> visitor)
             throws COSException
```
  Specified by:
  
  accept in class COSBase
  
  Throws:
  
  COSException