Occurence (LogFiltering)

java.lang.Object
- org.processmining.logfiltering.algorithms.SPMF.Occurence

```
public class Occurence
extends java.lang.Object
```
This class represent a set of occurences in a sequence, as defined in the TRuleGrowth algorithm. Note that unlike the RuleGrowth algorithms, all occurences in a sequence are kept instead of just the first and last one. This is the main difference between the two implementations of "Occurence".

Author:

Philippe Fournier-Viger

See Also:

AlgoTRuleGrowth, Sequence, SequenceDatabase

Field Summary

Fields
Modifier and Type	Field	Description
`java.util.List<java.lang.Short>`	`occurences`	a list of occurences (position in this sequence)
`int`	`sequenceID`	the sequenceID (a.k.a transaction id)

Constructor Summary

Constructors
Constructor Description

Occurence(int sequenceID)
Contructor

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(short occurence)`	Add an occurence.
`boolean`	`equals(java.lang.Object obj)`	Check if a given Occurence is the same as this one (used to store occurence in Collections).
`short`	`getFirst()`	Get the first occurence in this sequence.
`short`	`getLast()`	Get the last occurence in this sequence.
`int`	`hashCode()`	Get the hashcode.

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

- Field Detail
  - sequenceID
```
public int sequenceID
```
    the sequenceID (a.k.a transaction id)
  - occurences
```
public java.util.List<java.lang.Short> occurences
```
    a list of occurences (position in this sequence)
- Constructor Detail
  - Occurence
```
public Occurence(int sequenceID)
```
    Contructor
    
    Parameters:
    
    sequenceID - a sequence ID
- Method Detail
  - add
```
public void add(short occurence)
```
    Add an occurence.
    
    Parameters:
    
    occurence - the position of an itemset
  - getFirst
```
public short getFirst()
```
    Get the first occurence in this sequence.
    
    Returns:
    
    the position of an itemset
  - getLast
```
public short getLast()
```
    Get the last occurence in this sequence.
    
    Returns:
    
    the position of an itemset
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Check if a given Occurence is the same as this one (used to store occurence in Collections).
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    obj - another Occurence
    
    Returns:
    
    true if they both have the same sequence ID.
  - hashCode
```
public int hashCode()
```
    Get the hashcode.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    an hashcode