001/*
002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Alexandre Russel
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.annotations.service;
023
024import java.util.List;
025
026/**
027 * @author Alexandre Russel
028 */
029public class URLPatternFilter {
030
031    private final boolean allowDeny;
032
033    private final List<String> denies;
034
035    private final List<String> allows;
036
037    public URLPatternFilter(boolean allowDeny, List<String> denies, List<String> allows) {
038        this.allowDeny = allowDeny;
039        this.denies = denies;
040        this.allows = allows;
041    }
042
043    public boolean allow(String url) {
044        if (checkFirstPass(url) && !checkSecondPass(url)) {
045            return allowDeny;
046        }
047        return !allowDeny;
048    }
049
050    private boolean checkSecondPass(String url) {
051        return checkMatch(allowDeny ? denies : allows, url);
052    }
053
054    private static boolean checkMatch(List<String> list, String url) {
055        for (String regex : list) {
056            if (url.matches(regex)) {
057                return true;
058            }
059        }
060        return false;
061    }
062
063    private boolean checkFirstPass(String url) {
064        return checkMatch(allowDeny ? allows : denies, url);
065    }
066
067}