org.apache.jackrabbit.core.util
Interface StringIndex

All Known Implementing Classes:

DbNameIndex, FileBasedIndex, HashMapIndex, NamespaceRegistryImpl, NGKDbNameIndex, PostgreSQLNameIndex

public interface StringIndex

A persistent two-way mapping between strings and index integers. The index may or may not be sequential.

Method Summary

String	indexToString(int idx) Returns the string for a given index.
int	stringToIndex(String string) Returns the index for a given string.

Method Detail

stringToIndex

int stringToIndex(String string)
                  throws IllegalArgumentException

Returns the index for a given string. If the given string is not already indexed, the implementation can either automatically index it or throw an exception.

Parameters:

string - the indexed (or to be indexed) string

Returns:

index of the string

Throws:

IllegalArgumentException - if the string is not (and can not be) indexed

indexToString

String indexToString(int idx)
                     throws IllegalArgumentException

Returns the string for a given index.

Parameters:

idx - index of a string

Returns:

the indexed string

Throws:

IllegalArgumentException - if the indexed string does not exist