HashExtractor (SSSOM-Java 1.11.2 API)

java.lang.Object
- org.incenp.obofoundry.sssom.extract.MappingValueExtractor
- - org.incenp.obofoundry.sssom.extract.HashExtractor

All Implemented Interfaces:

IValueExtractor
```
public class HashExtractor
extends MappingValueExtractor
```
Extracts the standard SSSOM hash for a mapping.
This is used by expressions of the form mapping(N).special(hash).

Field Summary
- Fields inherited from class org.incenp.obofoundry.sssom.extract.MappingValueExtractor
  mappingNo

Constructor Summary

Constructors
Constructor	Description
`HashExtractor(int mappingNo)`	Creates a new instance.
`HashExtractor(int mappingNo, HashType type)`	Creates a new instance to extract a specific type of hash.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected Object`	`extract(Mapping mapping)`	Extracts the desired value from the given mapping.
`Class<?>`	`getType()`	Gets the type of the value that would be returned by `IValueExtractor.extract(MappingSet)`.

Methods inherited from class org.incenp.obofoundry.sssom.extract.MappingValueExtractor
extract

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

- Constructor Detail
  - HashExtractor
```
public HashExtractor(int mappingNo)
```
    Creates a new instance.
    
    Parameters:
    
    mappingNo - The 0-based index of the mapping from which to extract the hash, or (if negative) the 1-based index starting from the last mapping.
  - HashExtractor
```
public HashExtractor(int mappingNo,
                     HashType type)
```
    Creates a new instance to extract a specific type of hash.
    
    Parameters:
    
    mappingNo - The 0-based index of the mapping from which to extract the hash, or (if negative) the 1-based index starting from the last mapping.
    
    type - The type of hash to extract.
- Method Detail
  - extract
```
protected Object extract(Mapping mapping)
```
    Description copied from class: MappingValueExtractor
    
    Extracts the desired value from the given mapping.
    
    Specified by:
    
    extract in class MappingValueExtractor
    
    Parameters:
    
    mapping - The mapping from which to extract the value.
    
    Returns:
    
    The desired value, or null if the mapping does not have a value at the specified location.
  - getType
```
public Class<?> getType()
```
    Description copied from interface: IValueExtractor
    
    Gets the type of the value that would be returned by IValueExtractor.extract(MappingSet).
    
    Returns:
    
    The actual Java class of the object representing the extracted value.