org.apache.lucene.util
Class StringHelper

java.lang.Object
  org.apache.lucene.util.StringHelper

public abstract class StringHelper
extends Object

Methods for manipulating strings.

Field Summary

static StringInterner

interner Expert: The StringInterner implementation used by Lucene.

Method Summary

static int	bytesDifference(byte[] bytes1, int len1, byte[] bytes2, int len2) Compares two byte[] arrays, element by element, and returns the number of elements common to both arrays.
static String	intern(String s) Return the same string object for all equal strings
static int	stringDifference(String s1, String s2) Compares two strings, character by character, and returns the first position where the two strings differ from one another.

Methods inherited from class java.lang.Object

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

Field Detail

interner

public static StringInterner interner

Expert: The StringInterner implementation used by Lucene. This shouldn't be changed to an incompatible implementation after other Lucene APIs have been used.

Method Detail

intern

public static String intern(String s)

Return the same string object for all equal strings

bytesDifference

public static final int bytesDifference(byte[] bytes1,
                                        int len1,
                                        byte[] bytes2,
                                        int len2)

Compares two byte[] arrays, element by element, and returns the number of elements common to both arrays.

Parameters:

bytes1 - The first byte[] to compare

bytes2 - The second byte[] to compare

Returns:

The number of common elements.

stringDifference

public static final int stringDifference(String s1,
                                         String s2)

Compares two strings, character by character, and returns the first position where the two strings differ from one another.

Parameters:

s1 - The first string to compare

s2 - The second string to compare

Returns:

The first position where the two strings differ.