org.apache.hadoop.hbase.util

Class Strings

java.lang.Object

org.apache.hadoop.hbase.util.Strings

@InterfaceAudience.Private
public class Strings
extends java.lang.Object

Utility for Strings.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DEFAULT_KEYVALUE_SEPARATOR
static java.lang.String	DEFAULT_SEPARATOR

Constructor Summary

Constructors

Constructor and Description
Strings()

Method Summary

Modifier and Type	Method and Description
static java.lang.StringBuilder	appendKeyValue(java.lang.StringBuilder sb, java.lang.String key, java.lang.Object value) Append to a StringBuilder a key/value.
static java.lang.StringBuilder	appendKeyValue(java.lang.StringBuilder sb, java.lang.String key, java.lang.Object value, java.lang.String separator, java.lang.String keyValueSeparator) Append to a StringBuilder a key/value.
static java.lang.String	domainNamePointerToHostName(java.lang.String dnPtr) Given a PTR string generated via reverse DNS lookup, return everything except the trailing period.
static boolean	isEmpty(java.lang.String input) Null-safe length check.
static java.lang.String	padFront(java.lang.String input, char padding, int length) Push the input string to the right by appending a character before it, usually a space.
static java.lang.String	repeat(char c, int reapeatFor)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SEPARATOR

public static final java.lang.String DEFAULT_SEPARATOR

See Also:

Constant Field Values

DEFAULT_KEYVALUE_SEPARATOR

public static final java.lang.String DEFAULT_KEYVALUE_SEPARATOR

See Also:

Constant Field Values

Constructor Detail

Strings

public Strings()

Method Detail

appendKeyValue

public static java.lang.StringBuilder appendKeyValue(java.lang.StringBuilder sb,
                                                     java.lang.String key,
                                                     java.lang.Object value)

Append to a StringBuilder a key/value. Uses default separators.

Parameters:

sb - StringBuilder to use

key - Key to append.

value - Value to append.

Returns:

Passed sb populated with key/value.

appendKeyValue

public static java.lang.StringBuilder appendKeyValue(java.lang.StringBuilder sb,
                                                     java.lang.String key,
                                                     java.lang.Object value,
                                                     java.lang.String separator,
                                                     java.lang.String keyValueSeparator)

Append to a StringBuilder a key/value. Uses default separators.

Parameters:

sb - StringBuilder to use

key - Key to append.

value - Value to append.

separator - Value to use between key and value.

keyValueSeparator - Value to use between key/value sets.

Returns:

Passed sb populated with key/value.

domainNamePointerToHostName

public static java.lang.String domainNamePointerToHostName(java.lang.String dnPtr)

Given a PTR string generated via reverse DNS lookup, return everything except the trailing period. Example for host.example.com., return host.example.com

Parameters:

dnPtr - a domain name pointer (PTR) string.

Returns:

Sanitized hostname with last period stripped off.

isEmpty

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

Null-safe length check.

Parameters:

input -

Returns:

true if null or length==0

padFront

public static java.lang.String padFront(java.lang.String input,
                                        char padding,
                                        int length)

Push the input string to the right by appending a character before it, usually a space.

Parameters:

input - the string to pad

padding - the character to repeat to the left of the input string

length - the desired total length including the padding

Returns:

padding characters + input

repeat

public static java.lang.String repeat(char c,
                                      int reapeatFor)

Parameters:

c - repeat this character

reapeatFor - the length of the output String

Returns:

c, repeated repeatFor times