FreqMapExtractor

Available since Gaffer version 1.0.0

Extracts a count from a frequency map for a given key.

Examples

Java

JSON

Full JSON

Python

final FreqMapExtractor function = new FreqMapExtractor("key1");

{
  "class" : "FreqMapExtractor",
  "key" : "key1"
}

{
  "class" : "uk.gov.gchq.gaffer.types.function.FreqMapExtractor",
  "key" : "key1"
}

g.FreqMapExtractor( 
  key="key1" 
)

Input type:

uk.gov.gchq.gaffer.types.FreqMap

Example inputs:

Input Type	Input	Result Type	Result
uk.gov.gchq.gaffer.types.FreqMap	{key1=1, key2=2, key3=3}	java.lang.Long	1
uk.gov.gchq.gaffer.types.FreqMap	{key2=2, key3=3}		null
java.util.HashMap	{key1=1, key2=2, key3=3}		ClassCastException: java.util.HashMap cannot be cast to uk.gov.gchq.gaffer.types.FreqMap
	null		null