public abstract class BR.unicamp.Guarana.Composer

java.lang.Object
   |
   +----BR.unicamp.Guarana.MetaObject
           |
           +----BR.unicamp.Guarana.Composer

public abstract class Composer
  extends MetaObject

Composers are MetaObjects that delegate operations to other MetaObjects. The only difference between a MetaObject and a Composer is semantic: a Composer is expected to delegate operation handling to other MetaObjects, while non-Composers are expected to handle operations by themselves. A Composer must implement at least one method that will return the set of MetaObjects it delegates to.

Composer()

getMetaObjects()

Provides the set of MetaObjects the Composer delegates to

getMetaObjectsArray()

Provides an array of MetaObjects this Composer delegates to, that is ensured not to

public Composer();

public abstract Enumeration getMetaObjects();

Provides the set of MetaObjects the Composer delegates to. The Enumeration may contain non-MetaObject objects that mark up semantics of delegation. Thus, concurrent MetaObjects may be preceded and followed by such objects; MetaObjects that are only invoked conditionally may be marked so, etc. There are no predefined marks. Even if the Composer does not delegate to any MetaObject, it must return a non-null Enumeration. The Enumeration must reflect the set of MetaObjects at the moment of the invocation of this method; if the set of MetaObjects changes thereafter, the Enumeration must NOT change accordingly. It must iterate on a copy of the current set, or prevent any modification thereof.

Returns:

an unmodifiable set of MetaObjects the Composer delegates to as an Enumeration.

getMetaObjectsArray

public synchronized MetaObject[] getMetaObjectsArray();

Provides an array of MetaObjects this Composer delegates to, that is ensured not to change. It must be a copy of the current set of MetaObjects, or the array must be ensured not to change. The default behavior is to count the number of MetaObjects in the Enumeration returned by getMetaObjects(), then create an array that large, and copy references to the MetaObjects into that array. Mark up non-MetaObjects are ignored.

Returns:

an unmodifiable array of MetaObjects.

BR.unicamp.Guarana.Composer.html