| /* |
| * 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.Level; |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.core.net.Severity; |
| import org.apache.logging.log4j.layout.template.json.util.JsonWriter; |
| |
| import java.util.Arrays; |
| import java.util.Map; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| /** |
| * {@link Level} resolver. |
| * |
| * <h3>Configuration</h3> |
| * |
| * <pre> |
| * config = field , [ severity ] |
| * field = "field" -> ( "name" | "severity" ) |
| * severity = severity-field |
| * severity-field = "field" -> ( "keyword" | "code" ) |
| * </pre> |
| * |
| * <h3>Examples</h3> |
| * |
| * Resolve the level name: |
| * |
| * <pre> |
| * { |
| * "$resolver": "level", |
| * "field": "name" |
| * } |
| * </pre> |
| * |
| * Resolve the severity keyword: |
| * |
| * <pre> |
| * { |
| * "$resolver": "level", |
| * "field": "severity", |
| * "severity": { |
| * "field": "keyword" |
| * } |
| * } |
| * |
| * Resolve the severity code: |
| * |
| * <pre> |
| * { |
| * "$resolver": "level", |
| * "field": "severity", |
| * "severity": { |
| * "field": "code" |
| * } |
| * } |
| * </pre> |
| */ |
| public final class LevelResolver implements EventResolver { |
| |
| private static final String[] SEVERITY_CODE_RESOLUTION_BY_STANDARD_LEVEL_ORDINAL; |
| |
| static { |
| final int levelCount = Level.values().length; |
| final String[] severityCodeResolutionByStandardLevelOrdinal = |
| new String[levelCount + 1]; |
| for (final Level level : Level.values()) { |
| final int standardLevelOrdinal = level.getStandardLevel().ordinal(); |
| final int severityCode = Severity.getSeverity(level).getCode(); |
| severityCodeResolutionByStandardLevelOrdinal[standardLevelOrdinal] = |
| String.valueOf(severityCode); |
| } |
| SEVERITY_CODE_RESOLUTION_BY_STANDARD_LEVEL_ORDINAL = |
| severityCodeResolutionByStandardLevelOrdinal; |
| } |
| |
| private static final EventResolver SEVERITY_CODE_RESOLVER = |
| (final LogEvent logEvent, final JsonWriter jsonWriter) -> { |
| final int standardLevelOrdinal = |
| logEvent.getLevel().getStandardLevel().ordinal(); |
| final String severityCodeResolution = |
| SEVERITY_CODE_RESOLUTION_BY_STANDARD_LEVEL_ORDINAL[ |
| standardLevelOrdinal]; |
| jsonWriter.writeRawString(severityCodeResolution); |
| }; |
| |
| private final EventResolver internalResolver; |
| |
| LevelResolver( |
| final EventResolverContext context, |
| final TemplateResolverConfig config) { |
| this.internalResolver = createResolver(context, config); |
| } |
| |
| private static EventResolver createResolver( |
| final EventResolverContext context, |
| final TemplateResolverConfig config) { |
| final JsonWriter jsonWriter = context.getJsonWriter(); |
| final String fieldName = config.getString("field"); |
| if ("name".equals(fieldName)) { |
| return createNameResolver(jsonWriter); |
| } else if ("severity".equals(fieldName)) { |
| final String severityFieldName = |
| config.getString(new String[]{"severity", "field"}); |
| if ("keyword".equals(severityFieldName)) { |
| return createSeverityKeywordResolver(jsonWriter); |
| } else if ("code".equals(severityFieldName)) { |
| return SEVERITY_CODE_RESOLVER; |
| } |
| throw new IllegalArgumentException( |
| "unknown severity field: " + config); |
| } |
| throw new IllegalArgumentException("unknown field: " + config); |
| } |
| |
| private static EventResolver createNameResolver( |
| final JsonWriter contextJsonWriter) { |
| final Map<Level, String> resolutionByLevel = Arrays |
| .stream(Level.values()) |
| .collect(Collectors.toMap( |
| Function.identity(), |
| (final Level level) -> contextJsonWriter.use(() -> { |
| final String name = level.name(); |
| contextJsonWriter.writeString(name); |
| }))); |
| return (final LogEvent logEvent, final JsonWriter jsonWriter) -> { |
| final String resolution = resolutionByLevel.get(logEvent.getLevel()); |
| jsonWriter.writeRawString(resolution); |
| }; |
| } |
| |
| private static EventResolver createSeverityKeywordResolver( |
| final JsonWriter contextJsonWriter) { |
| final Map<Level, String> resolutionByLevel = Arrays |
| .stream(Level.values()) |
| .collect(Collectors.toMap( |
| Function.identity(), |
| (final Level level) -> contextJsonWriter.use(() -> { |
| final String severityKeyword = Severity.getSeverity(level).name(); |
| contextJsonWriter.writeString(severityKeyword); |
| }))); |
| return (final LogEvent logEvent, final JsonWriter jsonWriter) -> { |
| final String resolution = resolutionByLevel.get(logEvent.getLevel()); |
| jsonWriter.writeRawString(resolution); |
| }; |
| } |
| |
| static String getName() { |
| return "level"; |
| } |
| |
| @Override |
| public void resolve( |
| final LogEvent logEvent, |
| final JsonWriter jsonWriter) { |
| internalResolver.resolve(logEvent, jsonWriter); |
| } |
| |
| } |