io.dropwizard.util

Class Strings

java.lang.Object

io.dropwizard.util.Strings

public final class Strings
extends Object

Since:

2.0

Method Summary

Modifier and Type	Method and Description
static String	emptyToNull(String string) Returns the given string if it is nonempty; null otherwise.
static boolean	isNullOrEmpty(String string) Returns true if the given string is null or is the empty string.
static String	nullToEmpty(String string) Returns the given string if it is non-null; the empty string otherwise.
static String	repeat(String string, int count) Returns a string consisting of a specific number of concatenated copies of an input string.

Methods inherited from class java.lang.Object

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

Method Detail

nullToEmpty

public static String nullToEmpty(@Nullable
                                 String string)

Returns the given string if it is non-null; the empty string otherwise.

Parameters:

string - the string to test and possibly return

Returns:

string itself if it is non-null; "" if it is null

emptyToNull

@Nullable
public static String emptyToNull(@Nullable
                                           String string)

Returns the given string if it is nonempty; null otherwise.

Parameters:

string - the string to test and possibly return

Returns:

string itself if it is nonempty; null if it is empty or null

isNullOrEmpty

public static boolean isNullOrEmpty(@Nullable
                                    String string)

Returns true if the given string is null or is the empty string.

Consider normalizing your string references with nullToEmpty(java.lang.String). If you do, you can use String.isEmpty() instead of this method, and you won't need special null-safe forms of methods like String.toUpperCase(java.util.Locale) either. Or, if you'd like to normalize "in the other direction," converting empty strings to null, you can use emptyToNull(java.lang.String).

Parameters:

string - a string reference to check

Returns:

true if the string is null or is the empty string

repeat

public static String repeat(String string,
                            int count)

Returns a string consisting of a specific number of concatenated copies of an input string. For example, repeat("hey", 3) returns the string "heyheyhey".

Parameters:

string - any non-null string

count - the number of times to repeat it; a nonnegative integer

Returns:

a string containing string repeated count times (the empty string if count is zero)

Throws:

IllegalArgumentException - if count is negative