001/** 002 * Logback: the reliable, generic, fast and flexible logging framework. 003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved. 004 * 005 * This program and the accompanying materials are dual-licensed under 006 * either the terms of the Eclipse Public License v1.0 as published by 007 * the Eclipse Foundation 008 * 009 * or (per the licensee's choosing) 010 * 011 * under the terms of the GNU Lesser General Public License version 2.1 012 * as published by the Free Software Foundation. 013 */ 014package ch.qos.logback.core.spi; 015 016import java.util.ArrayList; 017import java.util.List; 018 019import ch.qos.logback.core.filter.Filter; 020import ch.qos.logback.core.util.COWArrayList; 021 022/** 023 * Implementation of FilterAttachable. 024 * 025 * @author Ceki Gülcü 026 */ 027final public class FilterAttachableImpl<E> implements FilterAttachable<E> { 028 029 @SuppressWarnings("unchecked") 030 COWArrayList<Filter<E>> filterList = new COWArrayList<Filter<E>>(new Filter[0]); 031 032 /** 033 * Add a filter to end of the filter list. 034 */ 035 public void addFilter(Filter<E> newFilter) { 036 filterList.add(newFilter); 037 } 038 039 /** 040 * Clear the filter chain 041 */ 042 public void clearAllFilters() { 043 filterList.clear(); 044 } 045 046 /** 047 * Loop through the filters in the list. As soon as a filter decides on ACCEPT 048 * or DENY, then that value is returned. If all of the filters return NEUTRAL, 049 * then NEUTRAL is returned. 050 */ 051 public FilterReply getFilterChainDecision(E event) { 052 053 final Filter<E>[] filterArrray = filterList.asTypedArray(); 054 final int len = filterArrray.length; 055 056 for (int i = 0; i < len; i++) { 057 final FilterReply r = filterArrray[i].decide(event); 058 if (r == FilterReply.DENY || r == FilterReply.ACCEPT) { 059 return r; 060 } 061 } 062 063 // no decision 064 return FilterReply.NEUTRAL; 065 } 066 067 public List<Filter<E>> getCopyOfAttachedFiltersList() { 068 return new ArrayList<Filter<E>>(filterList); 069 } 070}