| /* |
| * 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.logging.log4j.layout.template.json.resolver; |
| |
| import org.apache.logging.log4j.plugins.Plugin; |
| import org.apache.logging.log4j.plugins.PluginFactory; |
| import org.apache.logging.log4j.layout.template.json.JsonTemplateLayout.EventTemplateAdditionalField; |
| import org.apache.logging.log4j.layout.template.json.util.JsonReader; |
| |
| import java.util.Map; |
| |
| /** |
| * Interceptor to add {@link EventTemplateAdditionalField |
| * additional fields} after event template read. |
| */ |
| @Plugin(name = "EventAdditionalFieldInterceptor", category = TemplateResolverInterceptor.CATEGORY) |
| public class EventAdditionalFieldInterceptor implements EventResolverInterceptor { |
| |
| private static final EventAdditionalFieldInterceptor INSTANCE = |
| new EventAdditionalFieldInterceptor(); |
| |
| private EventAdditionalFieldInterceptor() {} |
| |
| @PluginFactory |
| public static EventAdditionalFieldInterceptor getInstance() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public Object processTemplateBeforeResolverInjection( |
| final EventResolverContext context, |
| final Object node) { |
| |
| // Short-circuit if there are no additional fields. |
| final EventTemplateAdditionalField[] additionalFields = |
| context.getEventTemplateAdditionalFields(); |
| if (additionalFields.length == 0) { |
| return node; |
| } |
| |
| // Check that the root is an object node. |
| final Map<String, Object> objectNode; |
| try { |
| @SuppressWarnings("unchecked") final Map<String, Object> map = (Map<String, Object>) node; |
| objectNode = map; |
| } catch (final ClassCastException error) { |
| final String message = String.format( |
| "was expecting an object to merge additional fields: %s", |
| node.getClass().getName()); |
| throw new IllegalArgumentException(message); |
| } |
| |
| // Merge additional fields. |
| for (final EventTemplateAdditionalField additionalField : additionalFields) { |
| final String additionalFieldKey = additionalField.getKey(); |
| final Object additionalFieldValue; |
| final EventTemplateAdditionalField.Format additionalFieldFormat = |
| additionalField.getFormat(); |
| if (EventTemplateAdditionalField.Format.STRING.equals(additionalFieldFormat)) { |
| additionalFieldValue = additionalField.getValue(); |
| } else if (EventTemplateAdditionalField.Format.JSON.equals(additionalFieldFormat)) { |
| try { |
| additionalFieldValue = JsonReader.read(additionalField.getValue()); |
| } catch (final Exception error) { |
| final String message = String.format( |
| "failed reading JSON provided by additional field: %s", |
| additionalFieldKey); |
| throw new IllegalArgumentException(message, error); |
| } |
| } else { |
| final String message = String.format( |
| "unknown format %s for additional field: %s", |
| additionalFieldKey, additionalFieldFormat); |
| throw new IllegalArgumentException(message); |
| } |
| objectNode.put(additionalFieldKey, additionalFieldValue); |
| } |
| |
| // Return the modified node. |
| return node; |
| |
| } |
| |
| } |