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package com.sun.jndi.ldap;

import javax.naming.directory.SearchControls;
import javax.naming.event.*;

This class holds the information in an event registration/deregistration request. This includes the name, filter, search controls and the different interfaces that the listener implements. This last piece of information determines which event(s) the listener is interested in.

It overrides equals() and hashCode() to use all these pieces of information so that it can be used correctly in a hashtable.

Author:Rosanna Lee
/** * This class holds the information in an event registration/deregistration * request. This includes the name, filter, search controls and * the different interfaces that the listener implements. This last piece * of information determines which event(s) the listener is interested in. *<p> * It overrides equals() and hashCode() to use all these pieces of * information so that it can be used correctly in a hashtable. * * @author Rosanna Lee */
final class NotifierArgs { static final int ADDED_MASK = 0x1; static final int REMOVED_MASK = 0x2; static final int CHANGED_MASK = 0x4; static final int RENAMED_MASK = 0x8; // these fields are package private; used by NamingEventNotifier String name; String filter; SearchControls controls; int mask; // package private NotifierArgs(String name, int scope, NamingListener l) { this(name, "(objectclass=*)", null, l); // if scope is not default, create search ctl and set it if (scope != EventContext.ONELEVEL_SCOPE) { controls = new SearchControls(); controls.setSearchScope(scope); } } // package private NotifierArgs(String name, String filter, SearchControls ctls, NamingListener l) { this.name = name; this.filter = filter; this.controls = ctls; if (l instanceof NamespaceChangeListener) { mask |= ADDED_MASK|REMOVED_MASK|RENAMED_MASK; } if (l instanceof ObjectChangeListener) { mask |= CHANGED_MASK; } } // checks name, filter, controls public boolean equals(Object obj) { if (obj instanceof NotifierArgs) { NotifierArgs target = (NotifierArgs)obj; return mask == target.mask && name.equals(target.name) && filter.equals(target.filter) && checkControls(target.controls); } return false; } private boolean checkControls(SearchControls ctls) { if ((controls == null || ctls == null)) { return ctls == controls; } // ctls are nonempty return (controls.getSearchScope() == ctls.getSearchScope()) && (controls.getTimeLimit() == ctls.getTimeLimit()) && (controls.getDerefLinkFlag() == ctls.getDerefLinkFlag()) && (controls.getReturningObjFlag() == ctls.getReturningObjFlag()) && (controls.getCountLimit() == ctls.getCountLimit()) && checkStringArrays(controls.getReturningAttributes(), ctls.getReturningAttributes()); } private static boolean checkStringArrays(String[] s1, String[] s2) { if ((s1 == null) || (s2 == null)) { return s1 == s2; } // both are nonnull if (s1.length != s2.length) { return false; } for (int i = 0; i < s1.length; i++) { if (!s1[i].equals(s2[i])) { return false; } } return true; } // save from having to recalculate each time private int sum = -1; public int hashCode() { if (sum == -1) sum = mask + name.hashCode() + filter.hashCode() + controlsCode(); return sum; } // used in calculating hash code private int controlsCode() { if (controls == null) return 0; int total = controls.getTimeLimit() + (int)controls.getCountLimit() + (controls.getDerefLinkFlag() ? 1 : 0) + (controls.getReturningObjFlag() ? 1 : 0); String[] attrs = controls.getReturningAttributes(); if (attrs != null) { for (int i = 0; i < attrs.length; i++) { total += attrs[i].hashCode(); } } return total; } }