org.exolab.castor.xml.schema

Interface Resolver

Known Implementing Classes:
ScopableResolver

public interface Resolver

Defines an object resolver but does not specify any implementation.

A lazy resolver would resolve an object given its identifier. The reference to the object will be created with a ResolvableReference object using the resolved and the identifier. When the object is requested, the resolve(String) method will be called to obtain it.

Some implementation will add and remove resolvable objects, e.g. a collection of objects that also acts as a resolver. These methods should implement addResolvable(String,Referable) and removeResolvable(String). Resolvers that do not implement these methods are still considered valid resolvers. For example, a database based resolver will operate consistently without implementing add/remove not through the database interface.

Author:
Assaf Arkin
See Also:
ResolvableReference

Method Summary

void
addResolvable(String id, Referable referent)
Adds a resolvable object to this resolver identified by id.
void
removeResolvable(String id)
Removes a resolvable object from this resolver.
Referable
resolve(String id)
Called to resolve a reference give the reference's identifier.

Method Details

addResolvable

public void addResolvable(String id,
                          Referable referent)
Adds a resolvable object to this resolver identified by id. Subsequent calls to resolve(String) with the same id will return referent.
Parameters:
id - The referent's identifier
referent - The referent object

removeResolvable

public void removeResolvable(String id)
Parameters:
id - The referent's identifier

resolve

public Referable resolve(String id)
Called to resolve a reference give the reference's identifier. If the reference is known, this method should return the referenced object. If the reference is unknown, this method should return null.
Parameters:
id - The identifier to resolve
Returns:
The resolved object

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