UsageKnowledge (Information System Model 7.1.0-SNAPSHOT API)

java.lang.Object
- org.gcube.informationsystem.discovery.knowledge.UsageKnowledge

```
public class UsageKnowledge
extends Object
```
A class that stores and manages knowledge about the usage of linked entities within the model.
It maintains a map where keys are type names (source, relation, or target) and values are sets of LinkedEntity objects that use that type.

Author:

Luca Frosini (ISTI - CNR)

Field Summary

Fields
Modifier and Type Field Description

protected Map<String,Set<LinkedEntity>> map
A map from type names to the set of linked entities that use them.

Constructor Summary

Constructors
Constructor Description

UsageKnowledge()
Default constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`add(String typeName, LinkedEntity linkedEntity)`	Adds a linked entity to the usage map for a specific type name.
`void`	`add(LinkedEntity linkedEntity)`	Adds a linked entity to the knowledge base, indexing it by its source, relation, and target types.
`void`	`addAll(Collection<LinkedEntity> linkedEntities)`	Adds a collection of linked entities to the knowledge base.
`Set<LinkedEntity>`	`getUsage(String typeName)`	Returns the set of linked entities that use a specific type.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - map
```
protected Map<String,Set<LinkedEntity>> map
```
    A map from type names to the set of linked entities that use them.
- Constructor Detail
  - UsageKnowledge
```
public UsageKnowledge()
```
    Default constructor. Initializes the usage map.
- Method Detail
  - add
```
protected void add(String typeName,
                   LinkedEntity linkedEntity)
```
    Adds a linked entity to the usage map for a specific type name.
    
    Parameters:
    
    typeName - The type name (source, relation, or target).
    
    linkedEntity - The linked entity to add.
  - add
```
public void add(LinkedEntity linkedEntity)
```
    Adds a linked entity to the knowledge base, indexing it by its source, relation, and target types.
    
    Parameters:
    
    linkedEntity - The linked entity to add.
  - addAll
```
public void addAll(Collection<LinkedEntity> linkedEntities)
```
    Adds a collection of linked entities to the knowledge base.
    
    Parameters:
    
    linkedEntities - The collection of linked entities to add.
  - getUsage
```
public Set<LinkedEntity> getUsage(String typeName)
```
    Returns the set of linked entities that use a specific type.
    
    Parameters:
    
    typeName - The name of the type.
    
    Returns:
    
    A set of LinkedEntity objects, or null if the type is not found.