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| <p> |
| Provides access to the components and profiles in an IOR without the overhead |
| of CDR encoding. |
| <p> |
| The abstract model of IORs works as follows: |
| |
| <ul> |
| <li>An IOR has a type ID string, and contains TaggedProfile instances.</li> |
| <li>An IIOPProfile isA TaggedProfile.</li> |
| <li>An IIOPProfile is composed of an IIOPProfileTemplate and an object ID.</li> |
| <li>An IIOPProfileTemplate has an ObjectKeyTemplate, and contains TaggedComponents.</li> |
| <li>A TaggedComponent has an ID, and can be written to an OuputStream.<li> |
| <li>A TaggedComponentFactory reads a TaggedComponent from an InputStream.<li> |
| </ul> |
| <p> |
| In all cases, containment is represented by having the appropriate interface (IOR and |
| IIOPProfileTemplate above) extend java.util.List. This makes it easy to use all of the |
| facilities in the Java collections framework with IORs. However, note that all |
| objects available through these APIs are immutable. Thus all list update operations |
| through UnsupportedOperationException, and list iterators cannot modify the underlying |
| list. |
| <p> |
| Templates are used because the basic object adapter model for object creation is to |
| establish all properties of an IOR (except for type and object ID) when the object |
| adapter is created. This has been present for the POA essentially from the beginning, |
| since policies can only be passed to create_POA, and cannot be changed on an existing |
| POA. The Portable Interceptors work has also made this clear, since the IOR interceptor |
| runs only when an object adapter is created, which is the only time that user code |
| can add tagged components to an IOR. |
| |
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