/*
* 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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/**
* Supports checking an attribute set satisfies a filter
* that is specified as a set of "matching" attributes.
* Checking is done by determining whether the given attribute set
* is a superset of the matching ones.
*
* @author Rosanna Lee
*/
package com.sun.jndi.toolkit.dir;
import javax.naming.*;
import javax.naming.directory.*;
public class ContainmentFilter implements AttrFilter {
private Attributes matchingAttrs;
public ContainmentFilter(Attributes match) {
matchingAttrs = match;
}
public boolean check(Attributes attrs) throws NamingException {
return matchingAttrs == null ||
matchingAttrs.size() == 0 ||
contains(attrs, matchingAttrs);
}
// returns true if superset contains subset
public static boolean contains(Attributes superset, Attributes subset)
throws NamingException {
if (subset == null)
return true; // an empty set is always a subset
NamingEnumeration m = subset.getAll();
while (m.hasMore()) {
if (superset == null) {
return false; // contains nothing
}
Attribute target = (Attribute) m.next();
Attribute fromSuper = superset.get(target.getID());
if (fromSuper == null) {
return false;
} else {
// check whether attribute values match
if (target.size() > 0) {
NamingEnumeration vals = target.getAll();
while (vals.hasMore()) {
if (!fromSuper.contains(vals.next())) {
return false;
}
}
}
}
}
return true;
}
}