ReaderRepository (com.bellotapps.webapps:webapps-commons-repository-utils 0.3.0-RELEASE API)

Type Parameters:

E - Concrete type of the entity to be managed by the repository.

ID - Concrete type of the entity's id.

All Known Subinterfaces:

BasicRepository<E,ID>
```
public interface ReaderRepository<E,ID>
```
Interface for a repository with basic reading operations.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`count()`	Returns the amount of entities available in the repository.
`boolean`	`existsById(ID id)`	Returns whether an entity with the given id exists.
`java.lang.Iterable<E>`	`findAll()`	Returns all the entities in the repository.
`java.util.Optional<E>`	`findById(ID id)`	Finds the entity with the given `id`.

- Method Detail
  - count
```
long count()
```
    Returns the amount of entities available in the repository.
    
    Returns:
    
    The amount of entities available.
  - existsById
```
boolean existsById(ID id)
            throws java.lang.IllegalArgumentException
```
    Returns whether an entity with the given id exists.
    
    Parameters:
    
    id - The id of the entity to check existence.
    
    Returns:
    
    true if an entity with the given id exists, or false otherwise.
    
    Throws:
    
    java.lang.IllegalArgumentException - If the given id is null.
  - findById
```
java.util.Optional<E> findById(ID id)
                        throws java.lang.IllegalArgumentException
```
    Finds the entity with the given id.
    
    Parameters:
    
    id - The id of the entity to be returned.
    
    Returns:
    
    An Optional that contains the entity with the given id if it exists, or empty otherwise.
    
    Throws:
    
    java.lang.IllegalArgumentException - If the given id is null.
  - findAll
```
java.lang.Iterable<E> findAll()
```
    Returns all the entities in the repository.
    
    Returns:
    
    All the entities.