| /* |
| * 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.nifi.registry.hook; |
| |
| import org.apache.nifi.registry.provider.ProviderConfigurationContext; |
| import org.apache.nifi.registry.provider.ProviderCreationException; |
| |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public abstract class WhitelistFilteringEventHookProvider |
| implements EventHookProvider { |
| |
| static final String EVENT_WHITELIST_PREFIX = "Whitelisted Event Type "; |
| static final Pattern EVENT_WHITELIST_PATTERN = Pattern.compile(EVENT_WHITELIST_PREFIX + "\\S+"); |
| |
| protected Set<EventType> whiteListEvents = null; |
| |
| @Override |
| public void onConfigured(ProviderConfigurationContext configurationContext) throws ProviderCreationException { |
| whiteListEvents = new HashSet<>(); |
| for (Map.Entry<String,String> entry : configurationContext.getProperties().entrySet()) { |
| Matcher matcher = EVENT_WHITELIST_PATTERN.matcher(entry.getKey()); |
| if (matcher.matches() && (entry.getValue() != null && entry.getValue().length() > 0)) { |
| whiteListEvents.add(EventType.valueOf(entry.getValue())); |
| } |
| |
| } |
| } |
| |
| /** |
| * Standard method for deciding if the EventType should be handled by the Hook provider or not. |
| * |
| * @param eventType |
| * EventType that was fired by the framework. |
| * |
| * @return |
| * True if the EventType is in the whitelist set and false otherwise. |
| */ |
| @Override |
| public boolean shouldHandle(EventType eventType) { |
| if (whiteListEvents != null && whiteListEvents.size() > 0) { |
| if (whiteListEvents.contains(eventType)) { |
| return true; |
| } |
| } else { |
| // If the whitelist property is not set or empty we want to fire for all events. |
| return true; |
| } |
| return false; |
| } |
| |
| } |