org.apache.nutch.util

Class StringUtil

java.lang.Object

org.apache.nutch.util.StringUtil

public class StringUtil
extends java.lang.Object

A collection of String processing utility methods.

Constructor Summary

Constructors

Constructor and Description
StringUtil()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	cleanField(java.lang.String value) Takes in a String value and cleans out any offending "�"
static byte[]	fromHexString(java.lang.String text) Convert a String containing consecutive (no inside whitespace) hexadecimal digits into a corresponding byte array.
static boolean	isEmpty(java.lang.String str) Checks if a string is empty (ie is null or empty).
static java.lang.String	leftPad(java.lang.String s, int length) Returns a copy of s padded with leading spaces so that it's length is length.
static void	main(java.lang.String[] args)
static java.lang.String	rightPad(java.lang.String s, int length) Returns a copy of s padded with trailing spaces so that it's length is length.
static java.lang.String	toHexString(byte[] buf) Convenience call for toHexString(byte[], String, int), where sep = null; lineLen = Integer.MAX_VALUE.
static java.lang.String	toHexString(byte[] buf, int of, int cb, java.lang.String sep, int lineLen) Get a text representation of a byte[] as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.
static java.lang.String	toHexString(byte[] buf, java.lang.String sep, int lineLen) Get a text representation of a byte[] as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.
static java.lang.String	toHexString(java.nio.ByteBuffer buf) Convenience call for toHexString(ByteBuffer, String, int), where sep = null; lineLen = Integer.MAX_VALUE.
static java.lang.String	toHexString(java.nio.ByteBuffer buf, java.lang.String sep, int lineLen) Get a text representation of a ByteBuffer as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.

Methods inherited from class java.lang.Object

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

Constructor Detail

StringUtil

public StringUtil()

Method Detail

rightPad

public static java.lang.String rightPad(java.lang.String s,
                                        int length)

Returns a copy of s padded with trailing spaces so that it's length is length. Strings already length characters long or longer are not altered.

leftPad

public static java.lang.String leftPad(java.lang.String s,
                                       int length)

Returns a copy of s padded with leading spaces so that it's length is length. Strings already length characters long or longer are not altered.

toHexString

public static java.lang.String toHexString(java.nio.ByteBuffer buf)

Convenience call for toHexString(ByteBuffer, String, int), where sep = null; lineLen = Integer.MAX_VALUE.

Parameters:

buf -

toHexString

public static java.lang.String toHexString(java.nio.ByteBuffer buf,
                                           java.lang.String sep,
                                           int lineLen)

Get a text representation of a ByteBuffer as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.

Parameters:

buf - input data

sep - separate every pair of hexadecimal digits with this separator, or null if no separation is needed.

lineLen - break the output String into lines containing output for lineLen bytes.

toHexString

public static java.lang.String toHexString(byte[] buf)

Convenience call for toHexString(byte[], String, int), where sep = null; lineLen = Integer.MAX_VALUE.

Parameters:

buf -

toHexString

public static java.lang.String toHexString(byte[] buf,
                                           java.lang.String sep,
                                           int lineLen)

Get a text representation of a byte[] as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.

Parameters:

buf - input data

sep - separate every pair of hexadecimal digits with this separator, or null if no separation is needed.

lineLen - break the output String into lines containing output for lineLen bytes.

toHexString

public static java.lang.String toHexString(byte[] buf,
                                           int of,
                                           int cb,
                                           java.lang.String sep,
                                           int lineLen)

Get a text representation of a byte[] as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.

Parameters:

buf - input data

of - the offset into the byte[] to start reading

cb - the number of bytes to read from the byte[]

sep - separate every pair of hexadecimal digits with this separator, or null if no separation is needed.

lineLen - break the output String into lines containing output for lineLen bytes.

fromHexString

public static byte[] fromHexString(java.lang.String text)

Convert a String containing consecutive (no inside whitespace) hexadecimal digits into a corresponding byte array. If the number of digits is not even, a '0' will be appended in the front of the String prior to conversion. Leading and trailing whitespace is ignored.

Parameters:

text - input text

Returns:

converted byte array, or null if unable to convert

isEmpty

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

Checks if a string is empty (ie is null or empty).

cleanField

public static java.lang.String cleanField(java.lang.String value)

Takes in a String value and cleans out any offending "�"

Parameters:

value - the dirty String value.

Returns:

clean String

main

public static void main(java.lang.String[] args)