HashMapIndex (Apache Jackrabbit 2.22.0 API)

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

Fields
Modifier and Type	Field	Description
`protected HashMap<Integer,String>`	`indexToString`	holds the index-to-string lookups.
`protected HashMap<String,Integer>`	`stringToIndex`	holds the string-to-index lookups.

Constructor Summary

Constructors
Constructor Description

HashMapIndex()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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