FreqMap (uk.gov.gchq.gaffer:gaffer2 2.2.0 API)

java.lang.Object
- java.util.AbstractMap<K,V>
- - java.util.HashMap<String,Long>
  - - uk.gov.gchq.gaffer.types.FreqMap

All Implemented Interfaces:

Serializable, Cloneable, Map<String,Long>
```
public class FreqMap
extends HashMap<String,Long>
```
FreqMap extends HashMap with String keys and Long values, adding an upsert operation.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class java.util.AbstractMap
  AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors
Constructor	Description
`FreqMap()`
`FreqMap(int initialCapacity)`
`FreqMap(int initialCapacity, float loadFactor)`
`FreqMap(String initialKey)`
`FreqMap(Map<? extends String,? extends Long> m)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Long`	`getTotal()`
`void`	`upsert(String key)`	Increments the value of an existing key by 1.
`void`	`upsert(String key, Long value)`	Adds a new key and value to the map if the key is not already there.

Methods inherited from class java.util.HashMap
clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap
equals, hashCode, toString

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map
equals, hashCode

- Constructor Detail
  - FreqMap
```
public FreqMap(Map<? extends String,? extends Long> m)
```
  - FreqMap
```
public FreqMap()
```
  - FreqMap
```
public FreqMap(int initialCapacity)
```
  - FreqMap
```
public FreqMap(int initialCapacity,
               float loadFactor)
```
  - FreqMap
```
public FreqMap(String initialKey)
```
- Method Detail
  - upsert
```
public void upsert(String key,
                   Long value)
```
    Adds a new key and value to the map if the key is not already there. If the key is already there, the value supplied is added to the existing value for the key and the result is inserted into the map.
    
    Parameters:
    
    key - The key in the map to increment or insert.
    
    value - The value to increment by or initialise to.
  - upsert
```
public void upsert(String key)
```
    Increments the value of an existing key by 1. If the key doesn't exist, initialises the value to 1.
    
    Parameters:
    
    key - The key to increment or insert.
  - getTotal
```
public Long getTotal()
```
    Returns:
    
    the total frequency.