NFAStateNameHandler (Flink : Libraries : CEP 1.19.1-cp2 API)

java.lang.Object
- org.apache.flink.cep.nfa.compiler.NFAStateNameHandler

```
public class NFAStateNameHandler
extends Object
```
A utility class used to handle name conventions and guarantee unique names for the states of our NFA.

Field Summary

Fields
Modifier and Type Field Description

static String STATE_NAME_DELIM

Constructor Summary

Constructors
Constructor Description

NFAStateNameHandler()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`checkNameUniqueness(String name)`	Checks if the given name is already used or not.
`void`	`clear()`	Clear the names added during checking name uniqueness.
`static String`	`getOriginalNameFromInternal(String internalName)`	Implements the reverse process of the `getUniqueInternalName(String)`.
`String`	`getUniqueInternalName(String baseName)`	Used to give a unique name to `NFA` states created during the translation process.

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

- Field Detail
  - STATE_NAME_DELIM
```
public static final String STATE_NAME_DELIM
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - NFAStateNameHandler
```
public NFAStateNameHandler()
```
- Method Detail
  - getOriginalNameFromInternal
```
public static String getOriginalNameFromInternal(String internalName)
```
    Implements the reverse process of the getUniqueInternalName(String).
    
    Parameters:
    
    internalName - The name to be decoded.
    
    Returns:
    
    The original, user-specified name for the state.
  - checkNameUniqueness
```
public void checkNameUniqueness(String name)
```
    Checks if the given name is already used or not. If yes, it throws a MalformedPatternException.
    
    Parameters:
    
    name - The name to be checked.
  - clear
```
public void clear()
```
    Clear the names added during checking name uniqueness.
  - getUniqueInternalName
```
public String getUniqueInternalName(String baseName)
```
    Used to give a unique name to NFA states created during the translation process. The name format will be baseName:counter , where the counter is increasing for states with the same baseName.
    
    Parameters:
    
    baseName - The base of the name.
    
    Returns:
    
    The (unique) name that is going to be used internally for the state.