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package javax.naming.spi;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.Reference;
import javax.naming.Referenceable;
import javax.naming.NamingException;
import javax.naming.CannotProceedException;
import javax.naming.directory.DirContext;
import javax.naming.directory.Attributes;

import com.sun.naming.internal.ResourceManager;
import com.sun.naming.internal.FactoryEnumeration;



This class contains methods for supporting DirContext implementations. 
 This class is an extension of NamingManager. It contains methods for use by service providers for accessing object factories and state factories, and for getting continuation contexts for supporting federation. 
 DirectoryManager is safe for concurrent access by multiple threads. 
 Except as otherwise noted, a Name, Attributes, or environment parameter passed to any method is owned by the caller. The implementation will not modify the object or keep a reference to it, although it may keep a reference to a clone or copy. 
Author:Rosanna Lee, Scott Seligman
See Also:
Since:1.3
/**
  * This class contains methods for supporting {@code DirContext}
  * implementations.
  *<p>
  * This class is an extension of {@code NamingManager}.  It contains methods
  * for use by service providers for accessing object factories and
  * state factories, and for getting continuation contexts for
  * supporting federation.
  *<p>
  * {@code DirectoryManager} is safe for concurrent access by multiple threads.
  *<p>
  * Except as otherwise noted,
  * a {@code Name}, {@code Attributes}, or environment parameter
  * passed to any method is owned by the caller.
  * The implementation will not modify the object or keep a reference
  * to it, although it may keep a reference to a clone or copy.
  *
  * @author Rosanna Lee
  * @author Scott Seligman
  *
  * @see DirObjectFactory
  * @see DirStateFactory
  * @since 1.3
  */

public class DirectoryManager extends NamingManager {

    /*
     * Disallow anyone from creating one of these.
     */
    DirectoryManager() {}

    
Creates a context in which to continue a DirContext operation. Operates just like NamingManager.getContinuationContext(), only the continuation context returned is a DirContext. 
Params:
  • cpe – 
        The non-null exception that triggered this continuation.
Throws:
See Also:
Returns:A non-null DirContext object for continuing the operation.
/**
      * Creates a context in which to continue a {@code DirContext} operation.
      * Operates just like {@code NamingManager.getContinuationContext()},
      * only the continuation context returned is a {@code DirContext}.
      *
      * @param cpe
      *         The non-null exception that triggered this continuation.
      * @return A non-null {@code DirContext} object for continuing the operation.
      * @exception NamingException If a naming exception occurred.
      *
      * @see NamingManager#getContinuationContext(CannotProceedException)
      */
    @SuppressWarnings("unchecked")
    public static DirContext getContinuationDirContext(
            CannotProceedException cpe) throws NamingException {

        Hashtable<Object,Object> env = (Hashtable<Object,Object>)cpe.getEnvironment();
        if (env == null) {
            env = new Hashtable<>(7);
        } else {
            // Make a (shallow) copy of the environment.
            env = (Hashtable<Object,Object>) env.clone();
        }
        env.put(CPE, cpe);

        return (new ContinuationDirContext(cpe, env));
    }

    
Creates an instance of an object for the specified object,
attributes, and environment.

 This method is the same as NamingManager.getObjectInstance except for the following differences: 
    

  •  It accepts an Attributes parameter that contains attributes associated with the object. The DirObjectFactory might use these attributes to save having to look them up from the directory. 
  •  The object factories tried must implement either ObjectFactory or DirObjectFactory. If it implements DirObjectFactory, DirObjectFactory.getObjectInstance() is used, otherwise, ObjectFactory.getObjectInstance() is used. 
 Service providers that implement the DirContext interface should use this method, not NamingManager.getObjectInstance(). 
Params:
  • refInfo – The possibly null object for which to create an object.
  • name – The name of this object relative to nameCtx. Specifying a name is optional; if it is omitted, name should be null.
  • nameCtx – The context relative to which the name parameter is specified. If null, name is relative to the default initial context.
  • environment – The possibly null environment to
        be used in the creation of the object factory and the object.
  • attrs – The possibly null attributes associated with refInfo.
        This might not be the complete set of attributes for refInfo;
        you might be able to read more attributes from the directory.
Throws:
  • NamingException – If a naming exception was encountered
        while attempting to get a URL context, or if one of the
        factories accessed throws a NamingException.
  • Exception – If one of the factories accessed throws an exception, or if an error was encountered while loading and instantiating the factory and object classes. A factory should only throw an exception if it does not want other factories to be used in an attempt to create an object. See DirObjectFactory.getObjectInstance().
See Also:
Returns:An object created using refInfo and attrs; or refInfo if an object cannot be created by a factory.
Since:1.3
/**
      * Creates an instance of an object for the specified object,
      * attributes, and environment.
      * <p>
      * This method is the same as {@code NamingManager.getObjectInstance}
      * except for the following differences:
      *<ul>
      *<li>
      * It accepts an {@code Attributes} parameter that contains attributes
      * associated with the object. The {@code DirObjectFactory} might use these
      * attributes to save having to look them up from the directory.
      *<li>
      * The object factories tried must implement either
      * {@code ObjectFactory} or {@code DirObjectFactory}.
      * If it implements {@code DirObjectFactory},
      * {@code DirObjectFactory.getObjectInstance()} is used, otherwise,
      * {@code ObjectFactory.getObjectInstance()} is used.
      *</ul>
      * Service providers that implement the {@code DirContext} interface
      * should use this method, not {@code NamingManager.getObjectInstance()}.
      *
      * @param refInfo The possibly null object for which to create an object.
      * @param name The name of this object relative to {@code nameCtx}.
      *         Specifying a name is optional; if it is
      *         omitted, {@code name} should be null.
      * @param nameCtx The context relative to which the {@code name}
      *         parameter is specified.  If null, {@code name} is
      *         relative to the default initial context.
      * @param environment The possibly null environment to
      *         be used in the creation of the object factory and the object.
      * @param attrs The possibly null attributes associated with refInfo.
      *         This might not be the complete set of attributes for refInfo;
      *         you might be able to read more attributes from the directory.
      * @return An object created using {@code refInfo} and {@code attrs}; or
      *         {@code refInfo} if an object cannot be created by
      *         a factory.
      * @exception NamingException If a naming exception was encountered
      *         while attempting to get a URL context, or if one of the
      *         factories accessed throws a NamingException.
      * @exception Exception If one of the factories accessed throws an
      *         exception, or if an error was encountered while loading
      *         and instantiating the factory and object classes.
      *         A factory should only throw an exception if it does not want
      *         other factories to be used in an attempt to create an object.
      *         See {@code DirObjectFactory.getObjectInstance()}.
      * @see NamingManager#getURLContext
      * @see DirObjectFactory
      * @see DirObjectFactory#getObjectInstance
      * @since 1.3
      */
    public static Object
        getObjectInstance(Object refInfo, Name name, Context nameCtx,
                          Hashtable<?,?> environment, Attributes attrs)
        throws Exception {

            ObjectFactory factory;

            ObjectFactoryBuilder builder = getObjectFactoryBuilder();
            if (builder != null) {
                // builder must return non-null factory
                factory = builder.createObjectFactory(refInfo, environment);
                if (factory instanceof DirObjectFactory) {
                    return ((DirObjectFactory)factory).getObjectInstance(
                        refInfo, name, nameCtx, environment, attrs);
                } else {
                    return factory.getObjectInstance(refInfo, name, nameCtx,
                        environment);
                }
            }

            // use reference if possible
            Reference ref = null;
            if (refInfo instanceof Reference) {
                ref = (Reference) refInfo;
            } else if (refInfo instanceof Referenceable) {
                ref = ((Referenceable)(refInfo)).getReference();
            }

            Object answer;

            if (ref != null) {
                String f = ref.getFactoryClassName();
                if (f != null) {
                    // if reference identifies a factory, use exclusively

                    factory = getObjectFactoryFromReference(ref, f);
                    if (factory instanceof DirObjectFactory) {
                        return ((DirObjectFactory)factory).getObjectInstance(
                            ref, name, nameCtx, environment, attrs);
                    } else if (factory != null) {
                        return factory.getObjectInstance(ref, name, nameCtx,
                                                         environment);
                    }
                    // No factory found, so return original refInfo.
                    // Will reach this point if factory class is not in
                    // class path and reference does not contain a URL for it
                    return refInfo;

                } else {
                    // if reference has no factory, check for addresses
                    // containing URLs
                    // ignore name & attrs params; not used in URL factory

                    answer = processURLAddrs(ref, name, nameCtx, environment);
                    if (answer != null) {
                        return answer;
                    }
                }
            }

            // try using any specified factories
            answer = createObjectFromFactories(refInfo, name, nameCtx,
                                               environment, attrs);
            return (answer != null) ? answer : refInfo;
    }

    private static Object createObjectFromFactories(Object obj, Name name,
            Context nameCtx, Hashtable<?,?> environment, Attributes attrs)
        throws Exception {

        FactoryEnumeration factories = ResourceManager.getFactories(
            Context.OBJECT_FACTORIES, environment, nameCtx);

        if (factories == null)
            return null;

        ObjectFactory factory;
        Object answer = null;
        // Try each factory until one succeeds
        while (answer == null && factories.hasMore()) {
            factory = (ObjectFactory)factories.next();
            if (factory instanceof DirObjectFactory) {
                answer = ((DirObjectFactory)factory).
                    getObjectInstance(obj, name, nameCtx, environment, attrs);
            } else {
                answer =
                    factory.getObjectInstance(obj, name, nameCtx, environment);
            }
        }
        return answer;
    }

    
Retrieves the state of an object for binding when given the original
object and its attributes.

 This method is like NamingManager.getStateToBind except for the following differences: 
    

  • It accepts an Attributes parameter containing attributes that were passed to the DirContext.bind() method. 
  • It returns a non-null DirStateFactory.Result instance containing the object to be bound, and the attributes to accompany the binding. Either the object or the attributes may be null. 
  •  The state factories tried must each implement either StateFactory or DirStateFactory. If it implements DirStateFactory, then DirStateFactory.getStateToBind() is called; otherwise, StateFactory.getStateToBind() is called. 
 Service providers that implement the DirContext interface should use this method, not NamingManager.getStateToBind(). 

See NamingManager.getStateToBind() for a description of how
the list of state factories to be tried is determined.

 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 attrs parameter. 
Params:
  • obj – The non-null object for which to get state to bind.
  • 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 state factory and
        the object's state.
  • attrs – The possibly null Attributes that is to be bound with the
        object.
Throws:
  • NamingException – If a naming exception was encountered while using the factories. A factory should only throw an exception if it does not want other factories to be used in an attempt to create an object. See DirStateFactory.getStateToBind().
See Also:
Returns:A non-null DirStateFactory.Result containing the object and attributes to be bound. If no state factory returns a non-null answer, the result will contain the object (obj) itself with the original attributes.
Since:1.3
/**
      * Retrieves the state of an object for binding when given the original
      * object and its attributes.
      * <p>
      * This method is like {@code NamingManager.getStateToBind} except
      * for the following differences:
      *<ul>
      *<li>It accepts an {@code Attributes} parameter containing attributes
      *    that were passed to the {@code DirContext.bind()} method.
      *<li>It returns a non-null {@code DirStateFactory.Result} instance
      *    containing the object to be bound, and the attributes to
      *    accompany the binding. Either the object or the attributes may be null.
      *<li>
      * The state factories tried must each implement either
      * {@code StateFactory} or {@code DirStateFactory}.
      * If it implements {@code DirStateFactory}, then
      * {@code DirStateFactory.getStateToBind()} is called; otherwise,
      * {@code StateFactory.getStateToBind()} is called.
      *</ul>
      *
      * Service providers that implement the {@code DirContext} interface
      * should use this method, not {@code NamingManager.getStateToBind()}.
      *<p>
      * See NamingManager.getStateToBind() for a description of how
      * the list of state factories to be tried is determined.
      *<p>
      * 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 attrs} parameter.
      *
      * @param obj The non-null object for which to get state to bind.
      * @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 state factory and
      *         the object's state.
      * @param attrs The possibly null Attributes that is to be bound with the
      *         object.
      * @return A non-null DirStateFactory.Result containing
      *  the object and attributes to be bound.
      *  If no state factory returns a non-null answer, the result will contain
      *  the object ({@code obj}) itself with the original attributes.
      * @exception NamingException If a naming exception was encountered
      *         while using the factories.
      *         A factory should only throw an exception if it does not want
      *         other factories to be used in an attempt to create an object.
      *         See {@code DirStateFactory.getStateToBind()}.
      * @see DirStateFactory
      * @see DirStateFactory#getStateToBind
      * @see NamingManager#getStateToBind
      * @since 1.3
      */
    public static DirStateFactory.Result
        getStateToBind(Object obj, Name name, Context nameCtx,
                       Hashtable<?,?> environment, Attributes attrs)
        throws NamingException {

        // Get list of state factories
        FactoryEnumeration factories = ResourceManager.getFactories(
            Context.STATE_FACTORIES, environment, nameCtx);

        if (factories == null) {
            // no factories to try; just return originals
            return new DirStateFactory.Result(obj, attrs);
        }

        // Try each factory until one succeeds
        StateFactory factory;
        Object objanswer;
        DirStateFactory.Result answer = null;
        while (answer == null && factories.hasMore()) {
            factory = (StateFactory)factories.next();
            if (factory instanceof DirStateFactory) {
                answer = ((DirStateFactory)factory).
                    getStateToBind(obj, name, nameCtx, environment, attrs);
            } else {
                objanswer =
                    factory.getStateToBind(obj, name, nameCtx, environment);
                if (objanswer != null) {
                    answer = new DirStateFactory.Result(objanswer, attrs);
                }
            }
        }

        return (answer != null) ? answer :
            new DirStateFactory.Result(obj, attrs); // nothing new
    }
}