org.apache.hadoop.hbase.util
Class Strings

java.lang.Object
  org.apache.hadoop.hbase.util.Strings

@InterfaceAudience.Private
public class Strings
extends Object

Utility for Strings.

Field Summary

static String	DEFAULT_KEYVALUE_SEPARATOR
static String	DEFAULT_SEPARATOR

Constructor Summary

Strings()

Method Summary

static StringBuilder	appendKeyValue(StringBuilder sb, String key, Object value) Append to a StringBuilder a key/value.
static StringBuilder	appendKeyValue(StringBuilder sb, String key, Object value, String separator, String keyValueSeparator) Append to a StringBuilder a key/value.
static String	domainNamePointerToHostName(String dnPtr) Given a PTR string generated via reverse DNS lookup, return everything except the trailing period.
static boolean	isEmpty(String input) Null-safe length check.
static String	join(CharSequence separator, Iterable<?> strings) Concatenates strings, using a separator.
static String	padFront(String input, char padding, int length) Push the input string to the right by appending a character before it, usually a space.
static 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 String DEFAULT_SEPARATOR

See Also:

Constant Field Values

DEFAULT_KEYVALUE_SEPARATOR

public static final String DEFAULT_KEYVALUE_SEPARATOR

See Also:

Constant Field Values

Constructor Detail

Strings

public Strings()

Method Detail

appendKeyValue

public static StringBuilder appendKeyValue(StringBuilder sb,
                                           String key,
                                           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 StringBuilder appendKeyValue(StringBuilder sb,
                                           String key,
                                           Object value,
                                           String separator,
                                           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 String domainNamePointerToHostName(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(String input)

Null-safe length check.

Parameters:

input -

Returns:

true if null or length==0

padFront

public static String padFront(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 String repeat(char c,
                            int reapeatFor)

Parameters:

c - repeat this character

reapeatFor - the length of the output String

Returns:

c, repeated repeatFor times

join

public static String join(CharSequence separator,
                          Iterable<?> strings)

Concatenates strings, using a separator.

Parameters:

separator - Separator to join with.

strings - Strings to join.