javax.validation
Class Validation

java.lang.Object
  javax.validation.Validation

public class Validation
extends java.lang.Object

This class is the entry point for the Bean Validation framework. There are three ways to bootstrap the framework:

• The easiest approach is to build the default ValidatorFactory.

  ValidatorFactory factory = Validation.buildDefaultValidatorFactory();

  In this case, the default validation provider resolver will be used to locate available providers. The chosen provider is defined as followed:
  • if the XML configuration defines a provider, this provider is used
  • if the XML configuration does not define a provider or if no XML configuration is present the first provider returned by the ValidationProviderResolver isntance is used.
• The second bootstrap approach allows to choose a custom ValidationProviderResolver. The chosen ValidationProvider is then determined in the same way as in the default bootstrapping case (see above).

  Configuration<?> configuration = Validation
      .byDefaultProvider()
      .providerResolver( new MyResolverStrategy() )
      .configure();
   ValidatorFactory factory = configuration.buildValidatorFactory();
   

• The third approach allows you to specify explicitly and in a type safe fashion the expected provider. Optionally you can choose a custom ValidationProviderResolver.

  ACMEConfiguration configuration = Validation
      .byProvider(ACMEProvider.class)
      .providerResolver( new MyResolverStrategy() )  // optionally set the provider resolver
      .configure();
   ValidatorFactory factory = configuration.buildValidatorFactory();
   

Note:

• The ValidatorFactory object built by the bootstrap process should be cached and shared amongst Validator consumers.
• This class is thread-safe.

Author:

Emmanuel Bernard, Hardy Ferentschik

Constructor Summary

Validation()

Method Summary

static ValidatorFactory	buildDefaultValidatorFactory() Build and return a ValidatorFactory instance based on the default Bean Validation provider and following the XML configuration.
static GenericBootstrap	byDefaultProvider() Build a Configuration.
static <T extends Configuration<T>,U extends ValidationProvider<T>> ProviderSpecificBootstrap<T>	byProvider(java.lang.Class<U> providerType) Build a Configuration for a particular provider implementation.

Methods inherited from class java.lang.Object

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

Constructor Detail

Validation

public Validation()

Method Detail

buildDefaultValidatorFactory

public static ValidatorFactory buildDefaultValidatorFactory()

Build and return a ValidatorFactory instance based on the default Bean Validation provider and following the XML configuration.

The provider list is resolved using the default validation provider resolver logic.

The code is semantically equivalent to Validation.byDefaultProvider().configure().buildValidatorFactory()

Returns:

ValidatorFactory instance.

Throws:

ValidationException - if the ValidatorFactory cannot be built

byDefaultProvider

public static GenericBootstrap byDefaultProvider()

Build a Configuration. The provider list is resolved using the strategy provided to the bootstrap state.

 Configuration<?> configuration = Validation
    .byDefaultProvider()
    .providerResolver( new MyResolverStrategy() )
    .configure();
 ValidatorFactory factory = configuration.buildValidatorFactory();
 

The provider can be specified in the XML configuration. If the XML configuration does not exsist or if no provider is specified, the first available provider will be returned.

Returns:

instance building a generic Configuration compliant with the bootstrap state provided.

byProvider

public static <T extends Configuration<T>,U extends ValidationProvider<T>> ProviderSpecificBootstrap<T> byProvider(java.lang.Class<U> providerType)

Build a Configuration for a particular provider implementation. Optionally overrides the provider resolution strategy used to determine the provider.

Used by applications targeting a specific provider programmatically.

 ACMEConfiguration configuration =
     Validation.byProvider(ACMEProvider.class)
             .providerResolver( new MyResolverStrategy() )
             .configure();
 

, where ACMEConfiguration is the Configuration sub interface uniquely identifying the ACME Bean Validation provider. and ACMEProvider is the ValidationProvider implementation of the ACME provider.

Parameters:

providerType - the ValidationProvider implementation type

Returns:

instance building a provider specific Configuration sub interface implementation.