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## org.springframework.validation
Class DefaultMessageCodesResolver

    java.lang.Object
      org.springframework.validation.DefaultMessageCodesResolver

All Implemented Interfaces:
  Serializable, MessageCodesResolver

    public class DefaultMessageCodesResolver

extends Object
implements MessageCodesResolver, Serializable

Default implementation of the `MessageCodesResolver` interface.

Will create two message codes for an object error, in the following order:

- 1.: code + "." + object name
- 2.: code

Will create four message codes for a field specification, in the following order:

- 1.: code + "." + object name + "." + field
- 2.: code + "." + field
- 3.: code + "." + field type
- 4.: code

For example, in case of code "typeMismatch", object name "user", field "age":

- 1. try "typeMismatch.user.age"
- 2. try "typeMismatch.age"
- 3. try "typeMismatch.int"
- 4. try "typeMismatch"

This resolution algorithm thus can be leveraged for example to show specific messages for binding errors like "required" and "typeMismatch":

- at the object + field level ("age" field, but only on "user");
- at the field level (all "age" fields, no matter which object name);
- or at the general level (all fields, on any object).

In case of array, `List` or `Map` properties, both codes for specific elements and for the whole collection are generated. Assuming a field "name" of an array "groups" in object "user":

- 1. try "typeMismatch.user.groups[0].name"
- 2. try "typeMismatch.user.groups.name"
- 3. try "typeMismatch.groups[0].name"
- 4. try "typeMismatch.groups.name"
- 5. try "typeMismatch.name"
- 6. try "typeMismatch.java.lang.String"
- 7. try "typeMismatch"

In order to group all codes into a specific category within your resource bundles, e.g. "validation.typeMismatch.name" instead of the default "typeMismatch.name", consider specifying a `prefix` to be applied.

Since:
  1.0.1
Author:
  Juergen Hoeller
See Also:
  Serialized Form

Field Summary
`static String` | `CODE_SEPARATOR` The separator that this implementation uses when resolving message codes.

Constructor Summary
`DefaultMessageCodesResolver()`

Method Summary
`protected void` | `buildFieldList(String field, List<String> fieldList)` Add both keyed and non-keyed entries for the supplied `field` to the supplied field list.
`protected String` | `getPrefix()` Return the prefix to be applied to any code built by this resolver.
`protected String` | `postProcessMessageCode(String code)` Post-process the given message code, built by this resolver.
`String[]` | `resolveMessageCodes(String errorCode, String objectName)` Build message codes for the given error code and object name.
`String[]` | `resolveMessageCodes(String errorCode, String objectName, String field, Class fieldType)` Build the code list for the given code and field: an object/field-specific code, a field-specific code, a plain error code.
`void` | `setPrefix(String prefix)` Specify a prefix to be applied to any code built by this resolver.

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

Field Detail

### CODE_SEPARATOR

    public static final String CODE_SEPARATOR

  The separator that this implementation uses when resolving message codes.

  See Also:
    Constant Field Values

Constructor Detail

### DefaultMessageCodesResolver

    public DefaultMessageCodesResolver()

Method Detail

### setPrefix

    public void setPrefix(String prefix)

  Specify a prefix to be applied to any code built by this resolver.

  Default is none. Specify, for example, "validation." to get error codes like "validation.typeMismatch.name".

### getPrefix

    protected String getPrefix()

  Return the prefix to be applied to any code built by this resolver.

  Returns an empty String in case of no prefix.

### resolveMessageCodes

    public String[] resolveMessageCodes(String errorCode,
                                        String objectName)

  Description copied from interface: `MessageCodesResolver`
  Build message codes for the given error code and object name. Used for building the codes list of an ObjectError.

  Specified by:
    `resolveMessageCodes` in interface `MessageCodesResolver`
  Parameters:
    `errorCode` - the error code used for rejecting the object
    `objectName` - the name of the object
  Returns:
    the message codes to use

### resolveMessageCodes

    public String[] resolveMessageCodes(String errorCode,
                                        String objectName,
                                        String field,
                                        Class fieldType)

  Build the code list for the given code and field: an object/field-specific code, a field-specific code, a plain error code.

  Arrays, Lists and Maps are resolved both for specific elements and the whole collection.

  See the `class level Javadoc` for details on the generated codes.

  Specified by:
    `resolveMessageCodes` in interface `MessageCodesResolver`
  Parameters:
    `errorCode` - the error code used for rejecting the value
    `objectName` - the name of the object
    `field` - the field name
    `fieldType` - the field type (may be `null` if not determinable)
  Returns:
    the list of codes

### buildFieldList

    protected void buildFieldList(String field,
                                  List<String> fieldList)

  Add both keyed and non-keyed entries for the supplied `field` to the supplied field list.

### postProcessMessageCode

    protected String postProcessMessageCode(String code)

  Post-process the given message code, built by this resolver.

  The default implementation applies the specified prefix, if any.

  Parameters:
    `code` - the message code as built by this resolver
  Returns:
    the final message code to be returned
  See Also:
    `setPrefix(java.lang.String)`

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