Package org.apache.tika.utils

Class StringUtils

java.lang.Object

org.apache.tika.utils.StringUtils

public class StringUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	EMPTY	The empty String "".
static final String	SPACE	A String for a space character.

Constructor Summary

Constructors

Constructor	Description
StringUtils()

Method Summary

Modifier and Type	Method	Description
static boolean	isBlank(String s)
static boolean	isEmpty(CharSequence cs)
static String	joinWith(String delimiter, List<String> lines)
static String	leftPad(String str, int size, char padChar)
static String	leftPad(String str, int size, String padStr)	Left pad a String with a specified String.
static String	repeat(char ch, int repeat)	Returns padding using the specified delimiter repeated to a given length.
static String	repeat(String str, int repeat)	Repeat a String repeat times to form a new String.

Methods inherited from class java.lang.Object

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

Field Details

EMPTY

public static final String EMPTY

The empty String "".

Since:

2.0

See Also:

• Constant Field Values

SPACE

public static final String SPACE

A String for a space character.

Since:

3.2

See Also:

• Constant Field Values

Constructor Details

StringUtils

public StringUtils()

Method Details

isEmpty

public static boolean isEmpty(CharSequence cs)

isBlank

public static boolean isBlank(String s)

leftPad

public static String leftPad(String str,
 int size,
 String padStr)

Left pad a String with a specified String.

Pad to a size of size.

 StringUtils.leftPad(null, *, *)      = null
 StringUtils.leftPad("", 3, "z")      = "zzz"
 StringUtils.leftPad("bat", 3, "yz")  = "bat"
 StringUtils.leftPad("bat", 5, "yz")  = "yzbat"
 StringUtils.leftPad("bat", 8, "yz")  = "yzyzybat"
 StringUtils.leftPad("bat", 1, "yz")  = "bat"
 StringUtils.leftPad("bat", -1, "yz") = "bat"
 StringUtils.leftPad("bat", 5, null)  = "  bat"
 StringUtils.leftPad("bat", 5, "")    = "  bat"
 

Parameters:

str - the String to pad out, may be null

size - the size to pad to

padStr - the String to pad with, null or empty treated as single space

Returns:

left padded String or original String if no padding is necessary, null if null String input

leftPad

public static String leftPad(String str,
 int size,
 char padChar)

repeat

public static String repeat(char ch,
 int repeat)

Returns padding using the specified delimiter repeated to a given length.

 StringUtils.repeat('e', 0)  = ""
 StringUtils.repeat('e', 3)  = "eee"
 StringUtils.repeat('e', -2) = ""
 

Note: this method does not support padding with Unicode Supplementary Characters as they require a pair of chars to be represented. If you are needing to support full I18N of your applications consider using repeat(String, int) instead.

Parameters:

ch - character to repeat

repeat - number of times to repeat char, negative treated as zero

Returns:

String with repeated character

See Also:

• repeat(String, int)

repeat

public static String repeat(String str,
 int repeat)

Repeat a String repeat times to form a new String.

 StringUtils.repeat(null, 2) = null
 StringUtils.repeat("", 0)   = ""
 StringUtils.repeat("", 2)   = ""
 StringUtils.repeat("a", 3)  = "aaa"
 StringUtils.repeat("ab", 2) = "abab"
 StringUtils.repeat("a", -2) = ""
 

Parameters:

str - the String to repeat, may be null

repeat - number of times to repeat str, negative treated as zero

Returns:

a new String consisting of the original String repeated, null if null String input

joinWith

public static String joinWith(String delimiter,
 List<String> lines)