Package org.apache.flink.cep.nfa.compiler

Class NFAStateNameHandler

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 final String	STATE_NAME_DELIM

Constructor Summary

Constructors

Constructor	Description
NFAStateNameHandler()

Method Summary

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 Details

STATE_NAME_DELIM

public static final String STATE_NAME_DELIM

See Also:

• Constant Field Values

Constructor Details

NFAStateNameHandler

public NFAStateNameHandler()

Method Details

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.