KeyResolver

java.lang.Object
- org.eclipse.persistence.jpa.jpql.tools.resolver.Resolver
- - org.eclipse.persistence.jpa.jpql.tools.resolver.KeyResolver

```
public class KeyResolver
extends Resolver
```
This Resolver is responsible to return the map key, which means that for identification variables referring to an instance of an association or collection represented as a Map, the identification variable is of the abstract schema type of the map key.

Since:

2.3

Version:

2.5

Author:

Pascal Filion

See Also:

ValueResolver

Constructor Summary

Constructors
Constructor Description

KeyResolver(Resolver parent)
Creates a new KeyResolver.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`IManagedType`	`getManagedType()`	Returns the `IManagedType` associated with the field handled by this `Resolver`.
`String`	`toString()`

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.resolver.Resolver
addChild, getChild, getMapping, getParent, getParentManagedType, getParentMapping, getParentType, getParentTypeDeclaration, getProvider, getQuery, getType, getType, getType, getTypeDeclaration, getTypeHelper, getTypeRepository, isNullAllowed, setNullAllowed

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

- Constructor Detail
  - KeyResolver
```
public KeyResolver(Resolver parent)
```
    Creates a new KeyResolver.
    
    Parameters:
    
    parent - The parent Resolver, which is never null
- Method Detail
  - getManagedType
```
public IManagedType getManagedType()
```
    Returns the IManagedType associated with the field handled by this Resolver. If this Resolver does not handle a field that has a IManagedType, then null should be returned.
    For example: "SELECT e FROM Employee e", the Resolver for e would be returning the IManagedType for Employee.
    
    Overrides:
    
    getManagedType in class Resolver
    
    Returns:
    
    Either the IManagedType, if it could be resolved; null otherwise
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object