# HashGroupify (ARX Developer Documentation)

org.deidentifier.arx.framework.check.groupify

## Class HashGroupify

- java.lang.Object
- - org.deidentifier.arx.framework.check.groupify.HashGroupify

-     public class HashGroupify
      extends java.lang.Object

  A hash groupify operator. It implements a hash table with chaining and keeps track of additional properties per equivalence class

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `HashGroupify(int capacity, ARXConfiguration.ARXConfigurationInternal config)` Constructs a new hash groupify operator.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addFromBuffer(int[] generalized, int[] other, int representative, int count, int pcount)` Adds a tuple from the buffer
    `void` | `addFromGroupify(int[] generalized, Distribution[] distributions, int representative, int count, int pcount)` Adds an entry from another groupify operator
    `void` | `addFromSnapshot(int[] generalized, int[][] elements, int[][] frequencies, int representative, int count, int pcount)` Adds a class from a snapshot
    `HashGroupifyEntry` | `getEntry(int[] tuple)` Returns the entry for the given tuple
    `HashGroupifyEntry` | `getFirstEquivalenceClass()` Returns the first entry
    `int` | `getNumberOfEquivalenceClasses()` Returns the current size in terms of classes
    `boolean` | `isMinimalClassSizeFulfilled()` Returns whether the current state of the dataset fulfills the minimal class-size property
    `boolean` | `isPrivacyModelFulfilled()` Returns whether the current state of the dataset fulfills the privacy model
    `Data` | `performMicroaggregation(int[][] data, int start, int num, DistributionAggregateFunction[] functions, int[] map, java.lang.String[] header, Dictionary dictionary)` Microaggregates all according attributes
    `void` | `performSuppression(int[][] data)` Marks all outliers in the given (generalized subset of the) input datasets
    `void` | `stateAnalyze(Transformation transformation, boolean force)` Analyzes the current state
    `void` | `stateClear()` Clears all entries
    `void` | `stateResetSuppression()` This method will reset all flags that indicate that equivalence classes are suppressed.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### HashGroupify

          public HashGroupify(int capacity,
                      ARXConfiguration.ARXConfigurationInternal config)

      Constructs a new hash groupify operator.
      Parameters:
        `capacity` - The capacity
        `config` - The config

  - ### Method Detail

    - #### addFromBuffer

          public void addFromBuffer(int[] generalized,
                           int[] other,
                           int representative,
                           int count,
                           int pcount)

      Adds a tuple from the buffer
      Parameters:
        `generalized` -
        `other` -
        `representative` -
        `count` -
        `pcount` -

    - #### addFromGroupify

          public void addFromGroupify(int[] generalized,
                             Distribution[] distributions,
                             int representative,
                             int count,
                             int pcount)

      Adds an entry from another groupify operator
      Parameters:
        `generalized` -
        `distributions` -
        `representative` -
        `count` -
        `pcount` -

    - #### addFromSnapshot

          public void addFromSnapshot(int[] generalized,
                             int[][] elements,
                             int[][] frequencies,
                             int representative,
                             int count,
                             int pcount)

      Adds a class from a snapshot
      Parameters:
        `generalized` -
        `elements` -
        `frequencies` -
        `representative` -
        `count` -
        `pcount` -

    - #### getEntry

          public HashGroupifyEntry getEntry(int[] tuple)

      Returns the entry for the given tuple
      Parameters:
        `tuple` -
      Returns:

    - #### getFirstEquivalenceClass

          public HashGroupifyEntry getFirstEquivalenceClass()

      Returns the first entry
      Returns:

    - #### getNumberOfEquivalenceClasses

          public int getNumberOfEquivalenceClasses()

      Returns the current size in terms of classes
      Returns:

    - #### isMinimalClassSizeFulfilled

          public boolean isMinimalClassSizeFulfilled()

      Returns whether the current state of the dataset fulfills the minimal class-size property
      Returns:

    - #### isPrivacyModelFulfilled

          public boolean isPrivacyModelFulfilled()

      Returns whether the current state of the dataset fulfills the privacy model
      Returns:

    - #### performMicroaggregation

          public Data performMicroaggregation(int[][] data,
                                     int start,
                                     int num,
                                     DistributionAggregateFunction[] functions,
                                     int[] map,
                                     java.lang.String[] header,
                                     Dictionary dictionary)

      Microaggregates all according attributes
      Parameters:
        `data` -
        `start` -
        `num` -
        `functions` -
        `map` -
        `header` -
        `dictionary` -
      Returns:

    - #### performSuppression

          public void performSuppression(int[][] data)

      Marks all outliers in the given (generalized subset of the) input datasets
      Parameters:
        `data` -

    - #### stateAnalyze

          public void stateAnalyze(Transformation transformation,
                          boolean force)

      Analyzes the current state
      Parameters:
        `transformation` -
        `force` -

    - #### stateClear

          public void stateClear()

      Clears all entries

    - #### stateResetSuppression

          public void stateResetSuppression()

      This method will reset all flags that indicate that equivalence classes are suppressed.