aQute.lib.persistentmap

Class PersistentMap<V>

java.lang.Object

java.util.AbstractMap<java.lang.String,V>

aQute.lib.persistentmap.PersistentMap<V>

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, java.util.Map<java.lang.String,V>

public class PersistentMap<V>
extends java.util.AbstractMap<java.lang.String,V>
implements java.io.Closeable

Implements a low performance but easy to use map that is backed on a directory. All objects are stored as JSON objects and therefore should be DTOs. Each key is a file name and the contents is the value encoded in JSON. The PersistentMap will attempt to lock the directory. This is a non-concurrent implementation so you must ensure it is only used in a single thread. It cannot of course also not share the data directory.

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
PersistentMap(java.io.File dir, java.lang.Class<V> type)
PersistentMap(java.io.File dir, java.lang.Class<V> type, java.util.Map<java.lang.String,V> map)
PersistentMap(java.io.File dir, java.lang.reflect.Type type)
PersistentMap(java.io.File dir, java.lang.reflect.Type type, java.util.Map<java.lang.String,V> map)

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
void	clear(long whenOlder)
void	close()
java.util.Set<java.util.Map.Entry<java.lang.String,V>>	entrySet()
java.util.Set<java.lang.String>	keySet()
V	put(java.lang.String key, V value)
V	remove(java.lang.String key)
java.lang.String	toString()

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, get, hashCode, isEmpty, putAll, remove, size, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PersistentMap

public PersistentMap(java.io.File dir,
             java.lang.reflect.Type type)
              throws java.lang.Exception

Throws:

java.lang.Exception

PersistentMap

public PersistentMap(java.io.File dir,
             java.lang.Class<V> type)
              throws java.lang.Exception

Throws:

java.lang.Exception

PersistentMap

public PersistentMap(java.io.File dir,
             java.lang.Class<V> type,
             java.util.Map<java.lang.String,V> map)
              throws java.lang.Exception

Throws:

java.lang.Exception

PersistentMap

public PersistentMap(java.io.File dir,
             java.lang.reflect.Type type,
             java.util.Map<java.lang.String,V> map)
              throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

entrySet

public java.util.Set<java.util.Map.Entry<java.lang.String,V>> entrySet()

Specified by:

entrySet in interface java.util.Map<java.lang.String,V>

Specified by:

entrySet in class java.util.AbstractMap<java.lang.String,V>

put

public V put(java.lang.String key,
    V value)

Specified by:

put in interface java.util.Map<java.lang.String,V>

Overrides:

put in class java.util.AbstractMap<java.lang.String,V>

remove

public V remove(java.lang.String key)

clear

public void clear()

Specified by:

clear in interface java.util.Map<java.lang.String,V>

Overrides:

clear in class java.util.AbstractMap<java.lang.String,V>

keySet

public java.util.Set<java.lang.String> keySet()

Specified by:

keySet in interface java.util.Map<java.lang.String,V>

Overrides:

keySet in class java.util.AbstractMap<java.lang.String,V>

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.util.AbstractMap<java.lang.String,V>

clear

public void clear(long whenOlder)