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

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

All Implemented Interfaces:

StringIndex

Direct Known Subclasses:

FileBasedIndex

public class HashMapIndex
extends Object
implements StringIndex

Implements a StringIndex that is based on a hashmap. Subclasses can override the protected load() and save() methods to implement persistent storage of the string index.

This class is thread-safe.

Field Summary

protected HashMap<Integer,String>	indexToString holds the index-to-string lookups.
protected HashMap<String,Integer>	stringToIndex holds the string-to-index lookups.

Constructor Summary

HashMapIndex()

Method Summary

String	indexToString(int i) Returns the string for a given index.
protected void	load() Loads the lookup table.
protected void	save() Saves the lookup table.
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

Field Detail

stringToIndex

protected final HashMap<String,Integer> stringToIndex

holds the string-to-index lookups.

indexToString

protected final HashMap<Integer,String> indexToString

holds the index-to-string lookups.

Constructor Detail

HashMapIndex

public HashMapIndex()

Method Detail

load

protected void load()

Loads the lookup table.

save

protected void save()

Saves the lookup table.

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