StringUnionOperations (Pinot local segment implementations 0.12.1 API)

java.lang.Object
- org.apache.pinot.segment.local.utils.nativefst.automaton.StringUnionOperations

```
public final class StringUnionOperations
extends Object
```
Operations for building minimal deterministic automata from sets of strings. The algorithm requires sorted input data, but is very fast (nearly linear with the input size). NOTE: This class is not used today but is a fast way of building automata so is kept for future uses of the library

Field Summary

Fields
Modifier and Type Field Description

static Comparator<CharSequence> LEXICOGRAPHIC_ORDER
Lexicographic order of input sequences.

Constructor Summary

Constructors
Constructor Description

StringUnionOperations()

Method Summary

Modifier and Type	Method	Description
`void`	`add(CharSequence current)`	Add another character sequence to this automaton.
`static State`	`build(CharSequence[] input)`	Build a minimal, deterministic automaton from a sorted list of strings.
`org.apache.pinot.segment.local.utils.nativefst.automaton.StringUnionOperations.StateWithTransitionLabels`	`complete()`	Finalize the automaton and return the root state.

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

- Field Detail
  - LEXICOGRAPHIC_ORDER
```
public static final Comparator<CharSequence> LEXICOGRAPHIC_ORDER
```
    Lexicographic order of input sequences.
- Constructor Detail
  - StringUnionOperations
```
public StringUnionOperations()
```
- Method Detail
  - build
```
public static State build(CharSequence[] input)
```
    Build a minimal, deterministic automaton from a sorted list of strings.
  - add
```
public void add(CharSequence current)
```
    Add another character sequence to this automaton. The sequence must be lexicographically larger or equal compared to any previous sequences added to this automaton (the input must be sorted).
  - complete
```
public org.apache.pinot.segment.local.utils.nativefst.automaton.StringUnionOperations.StateWithTransitionLabels complete()
```
    Finalize the automaton and return the root state. No more strings can be added to the builder after this call.
    
    Returns:
    
    Root automaton state.