org.apache.jackrabbit.core.persistence.util
Class HashMapIndex

java.lang.Object
  org.apache.jackrabbit.core.persistence.util.HashMapIndex

All Implemented Interfaces:

StringIndex

public class HashMapIndex
extends Object
implements StringIndex

Implements a StringIndex that is based on a hashmap and persists the names as property file.

Please note that this class is not synchronized and the calls need to ensure thread safeness.

Constructor Summary

HashMapIndex(FileSystemResource file)
Creates a new hashmap index and loads the lookup tables from the filesystem resource.

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

HashMapIndex

public HashMapIndex(FileSystemResource file)
             throws FileSystemException,
                    IOException

Creates a new hashmap index and loads the lookup tables from the filesystem resource. If it does not exist yet, it will create a new one.

Parameters:

file - the filesystem resource that stores the lookup tables.

Throws:

IOException - if an I/O error occurs.

FileSystemException - if an I/O error occurs.

Method Detail

stringToIndex

public int stringToIndex(String nsUri)

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. This implementation reloads the table from the resource if a lookup fails and if the resource was modified since.

Specified by:

stringToIndex in interface StringIndex

Parameters:

nsUri - the indexed (or to be indexed) string

Returns:

index of the string

indexToString

public String indexToString(int i)

Returns the string for a given index. This implementation reloads the table from the resource if a lookup fails and if the resource was modified since.

Specified by:

indexToString in interface StringIndex

Parameters:

i - index of a string

Returns:

the indexed string