org.apache.nifi.util

Interface StringSelector

public interface StringSelector

Fluent api for checking one or more strings and selecting the first non-empty one.

#toString() returns the first encountered non-empty string or "".

Optimized so that no intermediary objects are created, only one, once the first non-empty string is found.

Field Summary

Fields

Modifier and Type	Field and Description
static StringSelector	EMPTY_STRING_SELECTOR

Method Summary

Modifier and Type	Method and Description
boolean	found() May be used to stop processing subsequent inputs when a result is already available.
static StringSelector	of(String... strings) Starts the fluent expression by checking the first string(s).
StringSelector	or(String... strings) Check the next string(s).

Field Detail

EMPTY_STRING_SELECTOR

static final StringSelector EMPTY_STRING_SELECTOR

Method Detail

of

static StringSelector of(String... strings)

Starts the fluent expression by checking the first string(s).

Parameters:

strings - The first string(s) to check if empty.

Returns:

a StringSelector that checked the first string.

or

StringSelector or(String... strings)

Check the next string(s).

Parameters:

strings - The next string(s) to check if empty.

Returns:

a StringSelector that checked all strings so far.

found

boolean found()

May be used to stop processing subsequent inputs when a result is already available.

Returns:

true if a non-empty string has been found, false otherwise.