CollectionMap (Ontopia)

java.lang.Object
- java.util.AbstractMap<K,V>
- - java.util.HashMap<K,Collection<V>>
  - - net.ontopia.utils.CollectionMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,Collection<V>>
```
public class CollectionMap<K,V>
extends HashMap<K,Collection<V>>
```
INTERNAL: A map which stores entries containing Collection values. Any object can be used as key. The add(key,value) and remove(key,value) makes sure that the Collection values are updated correctly.
The maintained index must only contain values implementing the Collection interface. The data structure looks like this: {key: [value, value, ...], key: [value, ...]}
Empty entries are removed by default.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class java.util.AbstractMap
  AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K extends Object,V extends Object>

Field Summary

Fields
Modifier and Type Field Description

protected boolean drop_empty

Constructor Summary

Constructors
Constructor Description

CollectionMap()

CollectionMap(boolean drop_empty)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(K key, V value)`
`protected Collection<V>`	`createCollection()`
`void`	`move(V value, K old_key, K new_key)`
`boolean`	`remove(Object key, Object value)`

Methods inherited from class java.util.HashMap
clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap
equals, hashCode, toString

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map
equals, hashCode

Field Detail
- drop_empty
```
protected boolean drop_empty
```

Constructor Detail

CollectionMap
```
public CollectionMap()
```

CollectionMap

public CollectionMap(boolean drop_empty)

Method Detail

createCollection

protected Collection<V> createCollection()

add

public void add(K key,
                V value)

remove

public boolean remove(Object key,
                      Object value)

Specified by:: remove in interface Map<K,V>
Overrides:: remove in class HashMap<K,Collection<V>>

move

public void move(V value,
                 K old_key,
                 K new_key)