| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.sling.engine.impl.filter; |
| |
| import java.util.Iterator; |
| import java.util.SortedSet; |
| import java.util.TreeSet; |
| |
| import javax.servlet.Filter; |
| |
| /** |
| * The <code>SlingFilterChainHelper</code> class is used by Sling to |
| * support building lists of <code>Filter</code>s. To ensure filter |
| * ordering, each filter is optionally registered with an ordering index. If |
| * none is provided the default ordering index is Integer.MAX_VALUE to append |
| * the filter to the end of the list. |
| */ |
| public class SlingFilterChainHelper { |
| |
| private static final FilterHandle[] EMPTY_FILTER_ARRAY = new FilterHandle[0]; |
| |
| private SortedSet<FilterHandle> filterList; |
| |
| private FilterHandle[] filters = EMPTY_FILTER_ARRAY; |
| |
| SlingFilterChainHelper() { |
| } |
| |
| public synchronized Filter addFilter(final Filter filter, FilterPredicate pattern, |
| final long filterId, final int order, final String orderSource, FilterProcessorMBeanImpl mbean) { |
| if (filterList == null) { |
| filterList = new TreeSet<FilterHandle>(); |
| } |
| filterList.add(new FilterHandle(filter, pattern, filterId, order, orderSource, mbean)); |
| filters = getFiltersInternal(); |
| return filter; |
| } |
| |
| public synchronized boolean removeFilterById(final long filterId) { |
| if (filterList != null) { |
| for (Iterator<FilterHandle> fi = filterList.iterator(); fi.hasNext();) { |
| FilterHandle test = fi.next(); |
| if (test.getFilterId() == filterId) { |
| fi.remove(); |
| filters = getFiltersInternal(); |
| return true; |
| } |
| } |
| } |
| |
| // no removed filter |
| return false; |
| } |
| |
| /** |
| * Returns the list of <code>Filter</code>s added to this instance |
| * or <code>null</code> if no filters have been added. |
| * This method doesn't need to be synced as it is called from synced methods. |
| */ |
| public FilterHandle[] getFilters() { |
| return filters; |
| } |
| |
| private FilterHandle[] getFiltersInternal() { |
| if (filterList == null || filterList.isEmpty()) { |
| return EMPTY_FILTER_ARRAY; |
| } |
| return filterList.toArray(new FilterHandle[filterList.size()]); |
| } |
| } |