AuthorizationSummarizer (Apache Accumulo Core 2.0.0 API)

java.lang.Object
- org.apache.accumulo.core.client.summary.CountingSummarizer<ByteSequence>
- - org.apache.accumulo.core.client.summary.summarizers.AuthorizationSummarizer

All Implemented Interfaces:

Summarizer
```
public class AuthorizationSummarizer
extends CountingSummarizer<ByteSequence>
```
Counts unique authorizations in column visibility labels. Leverages super class to defend against too many. This class is useful for discovering what authorizations are present when the expected number of authorizations is small.
As an example, assume a data set of three keys with the column visibilities : (A&C)|(A&D), A&B, and C|E. For these input this summarizer would output : c:A=2, c:B=1, c:C=2, D:1, E:1. Notice that even though A occurred 3 times in total, its only counted once per column visibility.
See the superclass documentation for more information about usage and configuration.

Since:

2.0.0

See Also:

VisibilitySummarizer, TableOperations.addSummarizers(String, org.apache.accumulo.core.client.summary.SummarizerConfiguration...), TableOperations.summaries(String)

- Nested Class Summary
  - Nested classes/interfaces inherited from class org.apache.accumulo.core.client.summary.CountingSummarizer
    CountingSummarizer.Converter<K>
  - Nested classes/interfaces inherited from interface org.apache.accumulo.core.client.summary.Summarizer
    Summarizer.Collector, Summarizer.Combiner, Summarizer.StatisticConsumer
- Field Summary
  - Fields inherited from class org.apache.accumulo.core.client.summary.CountingSummarizer
    COUNTER_STAT_PREFIX, DELETES_IGNORED_STAT, EMITTED_STAT, INGNORE_DELETES_DEFAULT, INGNORE_DELETES_OPT, MAX_CKL_DEFAULT, MAX_COUNTER_DEFAULT, MAX_COUNTER_LEN_OPT, MAX_COUNTERS_OPT, SEEN_STAT, TOO_LONG_STAT, TOO_MANY_STAT
- Constructor Summary
  
  Constructors
  Constructor Description
  
  AuthorizationSummarizer()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  protected CountingSummarizer.Converter<ByteSequence> converter()
  - Methods inherited from class org.apache.accumulo.core.client.summary.CountingSummarizer
    collector, combiner, copier, encoder
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AuthorizationSummarizer
```
public AuthorizationSummarizer()
```
- Method Detail
  - converter
```
protected CountingSummarizer.Converter<ByteSequence> converter()
```
    Specified by:
    
    converter in class CountingSummarizer<ByteSequence>
    
    Returns:
    
    A function that is used to convert each key value to zero or more counter objects. Each function returned should be independent.