The DirStateFactory.java Java example source code
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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.
*<p>
* The JNDI framework allows for object implementations to
* be loaded in dynamically via <tt>object factories.
* <p>
* A <tt>DirStateFactory extends StateFactory
* by allowing an <tt>Attributes instance
* to be supplied to and be returned by the <tt>getStateToBind() method.
* <tt>DirStateFactory implementations are intended to be used by
* <tt>DirContext service providers.
* When a caller binds an object using <tt>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 <tt>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>
* ctx.rebind("inky", printer, printerAttrs);
*</pre>
* An LDAP service provider for <tt>ctx uses a DirStateFactory
* (indirectly via <tt>DirectoryManager.getStateToBind())
* and gives it <tt>printer and printerAttrs. A factory for
* an LDAP directory might turn <tt>printer into a set of attributes
* and merge that with <tt>printerAttrs. The service provider then
* uses the resulting attributes to create an LDAP entry and updates
* the directory.
*
* <p> Since DirStateFactory extends StateFactory, it
* has two <tt>getStateToBind() methods, where one
* differs from the other by the attributes
* argument. <tt>DirectoryManager.getStateToBind() will only use
* the form that accepts the attributes argument, while
* <tt>NamingManager.getStateToBind() will only use the form that
* does not accept the attributes argument.
*
* <p> 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
* @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.
*<p>
* <tt>DirectoryManager.getStateToBind()
* successively loads in state factories. If a factory implements
* <tt>DirStateFactory, DirectoryManager invokes this method;
* otherwise, it invokes <tt>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 <tt>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 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 <tt>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 <tt>Attributes object that is
* likewise owned by the caller, or a reference to the original
* <tt>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 <tt>inAttrs.
* @return A <tt>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().
*/
public static class Result {
/**
* The possibly null object to be bound.
*/
private Object obj;
/**
* The possibly null attributes to be bound.
*/
private Attributes attrs;
/**
* 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.
* @return The possibly null object to be bound.
*/
public Object getObject() { return obj; };
/**
* Retrieves the attributes to be bound.
* @return The possibly null attributes to be bound.
*/
public Attributes getAttributes() { return attrs; };
}
}
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