Marker

All Known Implementing Classes:

MarkerImpl
```
public interface Marker
```
An object obtained from the CAS that is used to query when FSs were created or modified with respect to the marker.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isModified(FeatureStructure fs)`	Test if a FeatureStructure in a CAS represented by this `Marker` existed before the mark was set, and has been modified.
`boolean`	`isNew(FeatureStructure fs)`
`boolean`	`isValid()`	A Marker becomes invalid when the `CAS` from which it was obtained is reset.

- Method Detail
  - isNew
```
boolean isNew(FeatureStructure fs)
```
    Parameters:
    
    fs - -
    
    Returns:
    
    true if a FeatureStructure was created after the mark represented by this Marker object.
  - isModified
```
boolean isModified(FeatureStructure fs)
```
    Test if a FeatureStructure in a CAS represented by this Marker existed before the mark was set, and has been modified. isModified(fs) == true implies that isNew(fs) == false.
    
    Parameters:
    
    fs - -
    
    Returns:
    
    true if a FeatureStructure that existed prior to the mark being set has been modified
  - isValid
```
boolean isValid()
```
    A Marker becomes invalid when the CAS from which it was obtained is reset.
    
    Returns:
    
    true if the Marker is still valid.