/*
 * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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 = (int)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;
    }
}