/*
 * @(#)EventDirContext.java	1.6 01/12/03
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.naming.event;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;

/**
 * Contains methods for registering listeners to be notified
 * of events fired when objects named in a directory context changes.
 *<p>
 * The methods in this interface support identification of objects by 
 * <A HREF="ftp://ftp.isi.edu/in-notes/rfc2254.txt">RFC 2254</a>
 * search filters.
 *
 *<P>Using the search filter, it is possible to register interest in objects 
 * that do not exist at the time of registration but later come into existence and
 * satisfy the filter.  However, there might be limitations in the extent
 * to which this can be supported by the service provider and underlying
 * protocol/service.  If the caller submits a filter that cannot be
 * supported in this way, <tt>addNamingListener()</tt> throws an
 * <tt>InvalidSearchFilterException</tt>.
 *<p>
 * See <tt>EventContext</tt> for a description of event source
 * and target, and information about listener registration/deregistration
 * that are also applicable to methods in this interface.
 * See the
 * <a href=package-summary.html#THREADING>package description</a>
 * for information on threading issues.
 *<p>
 * A <tt>SearchControls</tt> or array object
 * passed as a parameter to any method is owned by the caller.
 * The service provider will not modify the object or keep a reference to it.
 * 
 * @author Rosanna Lee
 * @author Scott Seligman
 * @version 1.6 01/12/03
 * @since 1.3
 */

public interface EventDirContext extends EventContext, DirContext {
    /**
     * Adds a listener for receiving naming events fired
     * when objects identified by the search filter <tt>filter</tt> at
     * the object named by target are modified.
     * <p>
     * The scope, returningObj flag, and returningAttributes flag from
     * the search controls <tt>ctls</tt> are used to control the selection
     * of objects that the listener is interested in,
     * and determines what information is returned in the eventual
     * <tt>NamingEvent</tt> object. Note that the requested
     * information to be returned might not be present in the <tt>NamingEvent</tt>
     * object if they are unavailable or could not be obtained by the
     * service provider or service.
     *
     * @param target The nonnull name of the object resolved relative to this context.
     * @param filter The nonnull string filter (see RFC2254).
     * @param ctls   The possibly null search controls. If null, the default
     * 	      search controls are used.
     * @param l  The nonnull listener.
     * @exception NamingException If a problem was encountered while
     * adding the listener.
     * @see EventContext#removeNamingListener
     * @see javax.naming.directory.DirContext#search(javax.naming.Name, java.lang.String, javax.naming.directory.SearchControls)
     */
    void addNamingListener(Name target, String filter, SearchControls ctls, 
	NamingListener l) throws NamingException;

    /**
     * Adds a listener for receiving naming events fired when
     * objects identified by the search filter <tt>filter</tt> at the
     * object named by the string target name are modified.
     * See the overload that accepts a <tt>Name</tt> for details of
     * how this method behaves.
     *
     * @param target The nonnull string name of the object resolved relative to this context.
     * @param filter The nonnull string filter (see RFC2254).
     * @param ctls   The possibly null search controls. If null, the default
     * 	      search controls is used.
     * @param l  The nonnull listener.
     * @exception NamingException If a problem was encountered while
     * adding the listener.
     * @see EventContext#removeNamingListener
     * @see javax.naming.directory.DirContext#search(java.lang.String, java.lang.String, javax.naming.directory.SearchControls)
     */
    void addNamingListener(String target, String filter, SearchControls ctls, 
	NamingListener l) throws NamingException;

    /**
     * Adds a listener for receiving naming events fired
     * when objects identified by the search filter <tt>filter</tt> and
     * filter arguments at the object named by the target are modified.
     * The scope, returningObj flag, and returningAttributes flag from
     * the search controls <tt>ctls</tt> are used to control the selection
     * of objects that the listener is interested in,
     * and determines what information is returned in the eventual
     * <tt>NamingEvent</tt> object.  Note that the requested
     * information to be returned might not be present in the <tt>NamingEvent</tt>
     * object if they are unavailable or could not be obtained by the
     * service provider or service.
     *
     * @param target The nonnull name of the object resolved relative to this context.
     * @param filter The nonnull string filter (see RFC2254).
     * @param filterArgs The possibly null array of arguments for the filter.
     * @param ctls   The possibly null search controls. If null, the default
     * 	      search controls are used.
     * @param l  The nonnull listener.
     * @exception NamingException If a problem was encountered while
     * adding the listener.
     * @see EventContext#removeNamingListener
     * @see javax.naming.directory.DirContext#search(javax.naming.Name, java.lang.String, java.lang.Object[], javax.naming.directory.SearchControls)
     */
    void addNamingListener(Name target, String filter, Object[] filterArgs,
	SearchControls ctls, NamingListener l) throws NamingException;

    /**
     * Adds a listener for receiving naming events fired when
     * objects identified by the search filter <tt>filter</tt> 
     * and filter arguments at the
     * object named by the string target name are modified.
     * See the overload that accepts a <tt>Name</tt> for details of
     * how this method behaves.
     *
     * @param target The nonnull string name of the object resolved relative to this context.
     * @param filter The nonnull string filter (see RFC2254).
     * @param filterArgs The possibly null array of arguments for the filter.
     * @param ctls   The possibly null search controls. If null, the default
     * 	      search controls is used.
     * @param l  The nonnull listener.
     * @exception NamingException If a problem was encountered while
     * adding the listener.
     * @see EventContext#removeNamingListener
     * @see javax.naming.directory.DirContext#search(java.lang.String, java.lang.String, java.lang.Object[], javax.naming.directory.SearchControls)      */
    void addNamingListener(String target, String filter, Object[] filterArgs,
	SearchControls ctls, NamingListener l) throws NamingException;
}
