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package javax.naming.spi;
import javax.naming.*;
import javax.naming.directory.Attributes;
import java.util.Hashtable;
This interface represents a factory for obtaining the state of an
object and corresponding attributes for binding.
The JNDI framework allows for object implementations to be loaded in dynamically via object factories.
A DirStateFactory extends StateFactory by allowing an Attributes instance to be supplied to and be returned by the getStateToBind() method. DirStateFactory implementations are intended to be used by DirContext service providers. When a caller binds an object using DirContext.bind(), he might also specify a set of attributes to be bound with the object. The object and attributes to be bound are passed to the getStateToBind() method of a factory. If the factory processes the object and attributes, it returns a corresponding pair of object and attributes to be bound. If the factory does not process the object, it must return null.
For example, a caller might bind a printer object with some printer-related
attributes.
ctx.rebind("inky", printer, printerAttrs);
An LDAP service provider for ctx uses a DirStateFactory (indirectly via DirectoryManager.getStateToBind()) and gives it printer and printerAttrs. A factory for an LDAP directory might turn printer into a set of attributes and merge that with printerAttrs. The service provider then uses the resulting attributes to create an LDAP entry and updates the directory. Since DirStateFactory extends StateFactory, it has two getStateToBind() methods, where one differs from the other by the attributes argument. DirectoryManager.getStateToBind() will only use the form that accepts the attributes argument, while NamingManager.getStateToBind() will only use the form that does not accept the attributes argument.
Either form of the getStateToBind() method of a DirStateFactory may be invoked multiple times, possibly using different parameters. The implementation is thread-safe.
Author: Rosanna Lee, Scott Seligman See Also: Since: 1.3
/**
* This interface represents a factory for obtaining the state of an
* object and corresponding attributes for binding.
*<p>
* The JNDI framework allows for object implementations to
* be loaded in dynamically via {@code object factories}.
* <p>
* A {@code DirStateFactory} extends {@code StateFactory}
* by allowing an {@code Attributes} instance
* to be supplied to and be returned by the {@code getStateToBind()} method.
* {@code DirStateFactory} implementations are intended to be used by
* {@code DirContext} service providers.
* When a caller binds an object using {@code DirContext.bind()},
* he might also specify a set of attributes to be bound with the object.
* The object and attributes to be bound are passed to
* the {@code getStateToBind()} method of a factory.
* If the factory processes the object and attributes, it returns
* a corresponding pair of object and attributes to be bound.
* If the factory does not process the object, it must return null.
*<p>
* For example, a caller might bind a printer object with some printer-related
* attributes.
*<blockquote><pre>
* ctx.rebind("inky", printer, printerAttrs);
*</pre></blockquote>
* An LDAP service provider for {@code ctx} uses a {@code DirStateFactory}
* (indirectly via {@code DirectoryManager.getStateToBind()})
* and gives it {@code printer} and {@code printerAttrs}. A factory for
* an LDAP directory might turn {@code printer} into a set of attributes
* and merge that with {@code printerAttrs}. The service provider then
* uses the resulting attributes to create an LDAP entry and updates
* the directory.
*
* <p> Since {@code DirStateFactory} extends {@code StateFactory}, it
* has two {@code getStateToBind()} methods, where one
* differs from the other by the attributes
* argument. {@code DirectoryManager.getStateToBind()} will only use
* the form that accepts the attributes argument, while
* {@code NamingManager.getStateToBind()} will only use the form that
* does not accept the attributes argument.
*
* <p> Either form of the {@code getStateToBind()} method of a
* DirStateFactory may be invoked multiple times, possibly using different
* parameters. The implementation is thread-safe.
*
* @author Rosanna Lee
* @author Scott Seligman
*
* @see DirectoryManager#getStateToBind
* @see DirObjectFactory
* @since 1.3
*/
public interface DirStateFactory extends StateFactory {
Retrieves the state of an object for binding given the object and attributes
to be transformed.
DirectoryManager.getStateToBind() successively loads in state factories. If a factory implements DirStateFactory, DirectoryManager invokes this method; otherwise, it invokes StateFactory.getStateToBind(). It does this until a factory produces a non-null answer.
When an exception is thrown by a factory, the exception is passed on to the caller of DirectoryManager.getStateToBind(). The search for other factories that may produce a non-null answer is halted. A factory should only throw an exception if it is sure that it is the only intended factory and that no other factories should be tried. If this factory cannot create an object using the arguments supplied, it should return null.
The name and nameCtx parameters may optionally be used to specify the name of the object being created. See the description of "Name and Context Parameters" in ObjectFactory.getObjectInstance() for details. If a factory uses nameCtx it should synchronize its use against concurrent access, since context implementations are not guaranteed to be thread-safe.
The name, inAttrs, and environment parameters are owned by the caller. The implementation will not modify these objects or keep references to them, although it may keep references to clones or copies. The object returned by this method is owned by the caller. The implementation will not subsequently modify it. It will contain either a new Attributes object that is likewise owned by the caller, or a reference to the original inAttrs parameter.
Params: - obj – A possibly null object whose state is to be retrieved.
- name – The name of this object relative to
nameCtx, or null if no name is specified. - nameCtx – The context relative to which the
name parameter is specified, or null if name is relative to the default initial context. - environment – The possibly null environment to
be used in the creation of the object's state.
- inAttrs – The possibly null attributes to be bound with the object. The factory must not modify
inAttrs.
Throws: - NamingException – If this factory encountered an exception
while attempting to get the object's state, and no other factories are
to be tried.
See Also: Returns: A Result containing the object's state for binding and the corresponding attributes to be bound; null if the object don't use this factory.
/**
* Retrieves the state of an object for binding given the object and attributes
* to be transformed.
*<p>
* {@code DirectoryManager.getStateToBind()}
* successively loads in state factories. If a factory implements
* {@code DirStateFactory}, {@code DirectoryManager} invokes this method;
* otherwise, it invokes {@code StateFactory.getStateToBind()}.
* It does this until a factory produces a non-null answer.
*<p>
* When an exception is thrown by a factory,
* the exception is passed on to the caller
* of {@code DirectoryManager.getStateToBind()}. The search for other factories
* that may produce a non-null answer is halted.
* A factory should only throw an exception if it is sure that
* it is the only intended factory and that no other factories
* should be tried.
* If this factory cannot create an object using the arguments supplied,
* it should return null.
* <p>
* The {@code name} and {@code nameCtx} parameters may
* optionally be used to specify the name of the object being created.
* See the description of "Name and Context Parameters" in
* {@link ObjectFactory#getObjectInstance ObjectFactory.getObjectInstance()}
* for details.
* If a factory uses {@code nameCtx} it should synchronize its use
* against concurrent access, since context implementations are not
* guaranteed to be thread-safe.
*<p>
* The {@code name}, {@code inAttrs}, and {@code environment} parameters
* are owned by the caller.
* The implementation will not modify these objects or keep references
* to them, although it may keep references to clones or copies.
* The object returned by this method is owned by the caller.
* The implementation will not subsequently modify it.
* It will contain either a new {@code Attributes} object that is
* likewise owned by the caller, or a reference to the original
* {@code inAttrs} parameter.
*
* @param obj A possibly null object whose state is to be retrieved.
* @param name The name of this object relative to {@code nameCtx},
* or null if no name is specified.
* @param nameCtx The context relative to which the {@code name}
* parameter is specified, or null if {@code name} is
* relative to the default initial context.
* @param environment The possibly null environment to
* be used in the creation of the object's state.
* @param inAttrs The possibly null attributes to be bound with the object.
* The factory must not modify {@code inAttrs}.
* @return A {@code Result} containing the object's state for binding
* and the corresponding
* attributes to be bound; null if the object don't use this factory.
* @exception NamingException If this factory encountered an exception
* while attempting to get the object's state, and no other factories are
* to be tried.
*
* @see DirectoryManager#getStateToBind
*/
public Result getStateToBind(Object obj, Name name, Context nameCtx,
Hashtable<?,?> environment,
Attributes inAttrs)
throws NamingException;
An object/attributes pair for returning the result of
DirStateFactory.getStateToBind().
/**
* An object/attributes pair for returning the result of
* DirStateFactory.getStateToBind().
*/
public static class Result {
The possibly null object to be bound.
/**
* The possibly null object to be bound.
*/
private Object obj;
The possibly null attributes to be bound.
/**
* The possibly null attributes to be bound.
*/
private Attributes attrs;
Constructs an instance of Result.
Params: - obj – The possibly null object to be bound.
- outAttrs – The possibly null attributes to be bound.
/**
* Constructs an instance of Result.
*
* @param obj The possibly null object to be bound.
* @param outAttrs The possibly null attributes to be bound.
*/
public Result(Object obj, Attributes outAttrs) {
this.obj = obj;
this.attrs = outAttrs;
}
Retrieves the object to be bound.
Returns: The possibly null object to be bound.
/**
* Retrieves the object to be bound.
* @return The possibly null object to be bound.
*/
public Object getObject() { return obj; };
Retrieves the attributes to be bound.
Returns: The possibly null attributes to be bound.
/**
* Retrieves the attributes to be bound.
* @return The possibly null attributes to be bound.
*/
public Attributes getAttributes() { return attrs; };
}
}