io.lettuce.core.internal

Class LettuceStrings

java.lang.Object

io.lettuce.core.internal.LettuceStrings

public class LettuceStrings
extends Object

Helper for String checks. This class is part of the internal API and may change without further notice.

Since:

3.0

Author:

Mark Paluch

Method Summary

Modifier and Type	Method and Description
static String	arrayToDelimitedString(Object[] arr, String delim) Convert a String array into a delimited String (e.g.
static String	collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix) Convert a Collection to a delimited String (e.g.
static boolean	isEmpty(CharSequence cs) Checks if a CharSequence has a length of 0 or null.
static boolean	isEmpty(String cs) Checks if a String is empty or null.
static boolean	isNotEmpty(CharSequence cs) Checks if a CharSequence has a non-zero length and is not null.
static boolean	isNotEmpty(String cs) Checks if a String is not empty and not null.
static String	string(double n) Convert double to String.
static char[]	toCharArray(CharSequence seq) Return a char[] from the give CharSequence.
static double	toDouble(String s) Convert String to double.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isEmpty

public static boolean isEmpty(String cs)

Checks if a String is empty or null.

Parameters:

cs - the char sequence

Returns:

true if empty

Since:

6.0.3

See Also:

String.isEmpty()

isEmpty

public static boolean isEmpty(CharSequence cs)

Checks if a CharSequence has a length of 0 or null.

Parameters:

cs - the char sequence

Returns:

true if empty

See Also:

CharSequence.length()

isNotEmpty

public static boolean isNotEmpty(String cs)

Checks if a String is not empty and not null.

Parameters:

cs - the char sequence

Returns:

true if not empty

Since:

6.0.3

See Also:

String.isEmpty()

isNotEmpty

public static boolean isNotEmpty(CharSequence cs)

Checks if a CharSequence has a non-zero length and is not null.

Parameters:

cs - the char sequence

Returns:

true if not empty

See Also:

CharSequence.length()

string

public static String string(double n)

Convert double to String. If n is infinite, returns positive/negative infinity +inf and -inf.

Parameters:

n - the double.

Returns:

string representation of n

toDouble

public static double toDouble(String s)

Convert String to double. If s is +inf/-inf, returns positive/negative infinity. If s is +nan/-nan, returns NaN.

Parameters:

s - string representation of the number

Returns:

the double value.

Since:

4.3.3

arrayToDelimitedString

public static String arrayToDelimitedString(Object[] arr,
                                            String delim)

Convert a String array into a delimited String (e.g. CSV).

Useful for toString() implementations.

Parameters:

arr - the array to display

delim - the delimiter to use (typically a ",")

Returns:

the delimited String

collectionToDelimitedString

public static String collectionToDelimitedString(Collection<?> coll,
                                                 String delim,
                                                 String prefix,
                                                 String suffix)

Convert a Collection to a delimited String (e.g. CSV).

Useful for toString() implementations.

Parameters:

coll - the Collection to convert

delim - the delimiter to use (typically a ",")

prefix - the String to start each element with

suffix - the String to end each element with

Returns:

the delimited String

toCharArray

public static char[] toCharArray(CharSequence seq)

Return a char[] from the give CharSequence.

Parameters:

seq - the sequence to read

Returns:

the character array

Since:

6.2