com.rometools.utils

Class Strings

java.lang.Object

com.rometools.utils.Strings

public final class Strings
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static boolean	isBlank(java.lang.String s) Checks whether a String is null, empty or blank.
static boolean	isEmpty(java.lang.String s) Checks whether a String is null or empty.
static boolean	isNotEmpty(java.lang.String s) Checks whether a String is neither null nor empty.
static boolean	isNull(java.lang.String s) Checks whether a String is null.
static java.lang.String	toLowerCase(java.lang.String s) null-safe lower-case conversion of a String.
static java.lang.String	trim(java.lang.String s) Removes the whitespace at the beginning and end of a String.
static java.lang.String	trimToEmpty(java.lang.String s) Removes the whitespace at the beginning and end of a String.
static java.lang.String	trimToNull(java.lang.String s) Removes the whitespace at the beginning and end of a String.

Methods inherited from class java.lang.Object

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

Method Detail

isNull

public static boolean isNull(java.lang.String s)

Checks whether a String is null.

Parameters:

s - The String to check

Returns:

true when the String is null, false otherwise

isEmpty

public static boolean isEmpty(java.lang.String s)

Checks whether a String is null or empty.

Parameters:

s - The String to check

Returns:

true when the String is null or empty, false otherwise

isNotEmpty

public static boolean isNotEmpty(java.lang.String s)

Checks whether a String is neither null nor empty.

Parameters:

s - The String to check

Returns:

true when the String is neither null nor empty, false otherwise

isBlank

public static boolean isBlank(java.lang.String s)

Checks whether a String is null, empty or blank.

Parameters:

s - The String to check

Returns:

true when the String is null, empty or blank, false otherwise

trim

public static java.lang.String trim(java.lang.String s)

Removes the whitespace at the beginning and end of a String.

Parameters:

s - The String to trim, may be null

Returns:

null when the input String is null, the trimmed String otherwise

trimToNull

public static java.lang.String trimToNull(java.lang.String s)

Removes the whitespace at the beginning and end of a String. When the String only contains whitespace, it returns null.

Parameters:

s - The String to trim, may be null

Returns:

null when the input String is null or does only contain whitespace, the trimmed String otherwise

trimToEmpty

public static java.lang.String trimToEmpty(java.lang.String s)

Removes the whitespace at the beginning and end of a String. When the String only contains whitespace, it returns null.

Parameters:

s - The String to trim, may be null

Returns:

null when the input String is null or does only contain whitespace, the trimmed String otherwise

toLowerCase

public static java.lang.String toLowerCase(java.lang.String s)

null-safe lower-case conversion of a String.

Parameters:

s - The String to process, may be null

Returns:

null when the input String is null, the String in lower-case otherwise