org.springframework.core

## Class SimpleAliasRegistry

- java.lang.Object
- - org.springframework.core.SimpleAliasRegistry

All Implemented Interfaces:
  AliasRegistry

Direct Known Subclasses:
  DefaultSingletonBeanRegistry, SimpleBeanDefinitionRegistry

    public class SimpleAliasRegistry
    extends Object
    implements AliasRegistry

Simple implementation of the `AliasRegistry` interface. Serves as base class for `BeanDefinitionRegistry` implementations.

Since:
  2.5.2
Author:
  Juergen Hoeller

### Constructor Summary

Constructors
Constructor and Description
`SimpleAliasRegistry()`

### Method Summary

Methods
`protected boolean` `allowAliasOverriding()` Return whether alias overriding is allowed.
`String` `canonicalName(String name)` Determine the raw name, resolving aliases to canonical names.
`protected void` `checkForAliasCircle(String name, String alias)` Check whether the given name points back to given alias as an alias in the other direction, catching a circular reference upfront and throwing a corresponding IllegalStateException.
`String[]` `getAliases(String name)` Return the aliases for the given name, if defined.
`boolean` `isAlias(String name)` Determine whether this given name is defines as an alias (as opposed to the name of an actually registered component).
`void` `registerAlias(String name, String alias)` Given a name, register an alias for it.
`void` `removeAlias(String alias)` Remove the specified alias from this registry.
`void` `resolveAliases(StringValueResolver valueResolver)` Resolve all alias target names and aliases registered in this factory, applying the given StringValueResolver to them.

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Constructor Detail

#### SimpleAliasRegistry

    public SimpleAliasRegistry()

### Method Detail

#### registerAlias

    public void registerAlias(String name,
                     String alias)

Description copied from interface: `AliasRegistry`
Given a name, register an alias for it.

Specified by:
  `registerAlias` in interface `AliasRegistry`
Parameters:
  `name` - the canonical name
  `alias` - the alias to be registered

#### allowAliasOverriding

    protected boolean allowAliasOverriding()

Return whether alias overriding is allowed. Default is `true`.

#### removeAlias

    public void removeAlias(String alias)

Description copied from interface: `AliasRegistry`
Remove the specified alias from this registry.

Specified by:
  `removeAlias` in interface `AliasRegistry`
Parameters:
  `alias` - the alias to remove

#### isAlias

    public boolean isAlias(String name)

Description copied from interface: `AliasRegistry`
Determine whether this given name is defines as an alias (as opposed to the name of an actually registered component).

Specified by:
  `isAlias` in interface `AliasRegistry`
Parameters:
  `name` - the bean name to check
Returns:
  whether the given name is an alias

#### getAliases

    public String[] getAliases(String name)

Description copied from interface: `AliasRegistry`
Return the aliases for the given name, if defined.

Specified by:
  `getAliases` in interface `AliasRegistry`
Parameters:
  `name` - the name to check for aliases
Returns:
  the aliases, or an empty array if none

#### resolveAliases

    public void resolveAliases(StringValueResolver valueResolver)

Resolve all alias target names and aliases registered in this factory, applying the given StringValueResolver to them.

The value resolver may for example resolve placeholders in target bean names and even in alias names.

Parameters:
  `valueResolver` - the StringValueResolver to apply

#### canonicalName

    public String canonicalName(String name)

Determine the raw name, resolving aliases to canonical names.

Parameters:
  `name` - the user-specified name
Returns:
  the transformed name

#### checkForAliasCircle

    protected void checkForAliasCircle(String name,
                           String alias)

Check whether the given name points back to given alias as an alias in the other direction, catching a circular reference upfront and throwing a corresponding IllegalStateException.

Parameters:
  `name` - the candidate name
  `alias` - the candidate alias
See Also:
  `registerAlias(java.lang.String, java.lang.String)`