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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
48       * ACCEPT or DENY, then that value is returned. If all of the filters return
49       * NEUTRAL, 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  }