1 /*
2 * Copyright (c) 2003, Henri Yandell
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or
6 * without modification, are permitted provided that the
7 * following conditions are met:
8 *
9 * + Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * + Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 *
16 * + Neither the name of OSJava nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32 package org.osjava.norbert;
33
34 import java.util.ArrayList;
35 import java.util.Iterator;
36 import java.util.List;
37
38 /***
39 * Contains a series of Rules. It then runs a path against these
40 * to decide if it is allowed or not.
41 */
42 // TODO: Make this package private?
43 class RulesEngine {
44
45 private List rules;
46
47 public RulesEngine() {
48 this.rules = new ArrayList();
49 }
50
51 public void allowPath(String path) {
52 add( new AllowedRule(path) );
53 }
54
55 public void disallowPath(String path) {
56 add( new DisallowedRule(path) );
57 }
58
59 public void add(Rule rule) {
60 this.rules.add(rule);
61 }
62
63 /***
64 * Run each Rule in series on the path.
65 * If a Rule returns a Boolean, return that.
66 * When no more rules are left, return null to indicate there were
67 * no rules for this path..
68 */
69 public Boolean isAllowed(String path) {
70
71 Iterator iterator = this.rules.iterator();
72 while(iterator.hasNext()) {
73 Rule rule = (Rule)iterator.next();
74 Boolean test = rule.isAllowed(path);
75 if(test != null) {
76 return test;
77 }
78 }
79
80 return null;
81 }
82
83 public boolean isEmpty() {
84 return this.rules.isEmpty();
85 }
86
87 public String toString() {
88 return "RulesEngine: " + this.rules;
89 }
90
91 }