com.sap.netweaver.bc.rf.mi.type

Interface ITypeManager

All Known Subinterfaces:

IMutableTypeManager

public interface ITypeManager

Read-Only interface describing a repository sub manager for type resolval. Resources may be asked if they support one or more special types, e.g. by implementing further interfaces or whatever. Beside really implementing further interfaces, they may contain instances or know how to instantiate or get instances of one or more special types.

This behaviour allows resources with the given limited interface of a standard resource handle to be "casted" to other objects with a specific interface, e.g. to a customer or contract or whatever.

It is also possible, to get a default instance for a resource hanlde, i.e. to "cast" a resource to a default type. This is useful for access layers not knowing what to access but needing the real object behind it in order to give it away to another layer not knowing the repository framework, but being able to handle instances of the default type.

Method Summary

Object	as(IResourceHandle resourceHandle, Class requestedType) Get resource AS instance of the given requested type ("cast").
boolean	isA(IResourceHandle resourceHandle, Class requestedType) Check if resource IS An or providing an instance of the given requested type ("instanceof").

Method Detail

isA

public boolean isA(IResourceHandle resourceHandle,
                   Class requestedType)
            throws ResourceException

Check if resource IS An or providing an instance of the given requested type ("instanceof"). If the requested type is null, this method returns true if this resource IS An instance of the default type.

Parameters:

resourceHandle - resource handle

requestedType - requested type (or null for implicit default type)

Returns:

true when resource handle represents a resource being or providing an instance of the given requested resp. default type

Throws:

ResourceException - when either the resource handle is invalid or the lookup wasn't successful

as

public Object as(IResourceHandle resourceHandle,
                 Class requestedType)
          throws ResourceException

Get resource AS instance of the given requested type ("cast"). If the requested type is null, this method returns the resource AS an instance of the default type.

Parameters:

resourceHandle - resource handle

requestedType - requested type (or null for implicit default type)

Returns:

instance of the given requested resp. default type

Throws:

ResourceException - when either the resource handle is invalid or the lookup wasn't successful