Package org.apache.tapestry5.commons

Interface OrderedConfiguration<T>

All Known Implementing Classes:

ValidatingOrderedConfigurationWrapper

public interface OrderedConfiguration<T>

Object passed into a service contributor method that allows the method provide contributed values to the service's configuration. A service can collect contributions in three different ways:

• As an un-ordered collection of values
• As an ordered list of values (where each value has a unique id, pre-requisites and post-requisites)
• As a map of keys and values

The service defines the type of contribution, in terms of a base class or service interface. Contributions must be compatible with the type, or be coercable to the type.

See Also:

Contribute, UsesConfiguration

Method Summary

Modifier and Type	Method	Description
void	add(String id, T object, String... constraints)	Adds an ordered object to a service's contribution.
void	addInstance(String id, Class<? extends T> clazz, String... constraints)	Adds an ordered object by instantiating (with dependencies) the indicated class.
void	override(String id, T object, String... constraints)	Overrides a normally contributed object.
void	overrideInstance(String id, Class<? extends T> clazz, String... constraints)	Instantiates an object and adds it as an override.

Method Detail

add

void add(String id,
         T object,
         String... constraints)

Adds an ordered object to a service's contribution. Each object has an id (which must be unique). Optionally, pre-requisites (a list of ids that must precede this object) and post-requisites (ids that must follow) can be provided. If no constraints are supplied, then an implicit constraint is supplied: after the previously contributed id within the same contribution method.

Parameters:

id - a unique id for the object; the id will be fully qualified with the contributing module's id

constraints - used to order the object relative to other contributed objects

object - to add to the service's configuration

override

void override(String id,
              T object,
              String... constraints)

Overrides a normally contributed object. Each override must match a single normally contributed object.

Parameters:

id - identifies object to override

object - overriding object (may be null)

constraints - constraints for the overridden object, replacing constraints for the original object (even if omitted, in which case the override object will have no ordering constraints)

Since:

5.1.0.0

addInstance

void addInstance(String id,
                 Class<? extends T> clazz,
                 String... constraints)

Adds an ordered object by instantiating (with dependencies) the indicated class. When the configuration type is an interface and the class to be contributed is a local file, then a reloadable proxy for the class will be created and contributed.

Parameters:

id - of contribution (used for ordering)

clazz - class to instantiate

constraints - used to order the object relative to other contributed objects

Since:

5.1.0.0

overrideInstance

void overrideInstance(String id,
                      Class<? extends T> clazz,
                      String... constraints)

Instantiates an object and adds it as an override. When the configuration type is an interface and the class to be contributed is a local file, then a reloadable proxy for the class will be created and contributed.

Parameters:

id - of object to override

clazz - to instantiate

constraints - constraints for the overridden object, replacing constraints for the original object (even if omitted, in which case the override object will have no ordering constraints)

Since:

5.1.0.0