1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4 *
5 * This program and the accompanying materials are dual-licensed under
6 * either the terms of the Eclipse Public License v1.0 as published by
7 * the Eclipse Foundation
8 *
9 * or (per the licensee's choosing)
10 *
11 * under the terms of the GNU Lesser General Public License version 2.1
12 * as published by the Free Software Foundation.
13 */
14 package ch.qos.logback.core.spi;
15
16 import java.util.ArrayList;
17 import java.util.List;
18
19 import ch.qos.logback.core.filter.Filter;
20 import ch.qos.logback.core.util.COWArrayList;
21
22 /**
23 * Implementation of FilterAttachable.
24 *
25 * @author Ceki Gülcü
26 */
27 final public class FilterAttachableImpl<E> implements FilterAttachable<E> {
28
29 @SuppressWarnings("unchecked")
30 COWArrayList<Filter<E>> filterList = new COWArrayList<Filter<E>>(new Filter[0]);
31
32 /**
33 * Add a filter to end of the filter list.
34 */
35 public void addFilter(Filter<E> newFilter) {
36 filterList.add(newFilter);
37 }
38
39 /**
40 * Clear the filter chain
41 */
42 public void clearAllFilters() {
43 filterList.clear();
44 }
45
46 /**
47 * Loop through the filters in the list. As soon as a filter decides on ACCEPT
48 * or DENY, then that value is returned. If all of the filters return NEUTRAL,
49 * then NEUTRAL is returned.
50 */
51 public FilterReply getFilterChainDecision(E event) {
52
53 final Filter<E>[] filterArrray = filterList.asTypedArray();
54 final int len = filterArrray.length;
55
56 for (int i = 0; i < len; i++) {
57 final FilterReply r = filterArrray[i].decide(event);
58 if (r == FilterReply.DENY || r == FilterReply.ACCEPT) {
59 return r;
60 }
61 }
62
63 // no decision
64 return FilterReply.NEUTRAL;
65 }
66
67 public List<Filter<E>> getCopyOfAttachedFiltersList() {
68 return new ArrayList<Filter<E>>(filterList);
69 }
70 }