/*
    * 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.core.layout;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.logging.log4j.core.impl.Log4jLogEvent;
  import org.apache.logging.log4j.core.jackson.JsonConstants;
  import org.apache.logging.log4j.core.jackson.Log4jJsonObjectMapper;
  import org.apache.logging.log4j.core.jackson.Log4jXmlObjectMapper;
  import org.apache.logging.log4j.core.jackson.XmlConstants;
  
  import com.fasterxml.jackson.core.PrettyPrinter;
  import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
  import com.fasterxml.jackson.core.util.MinimalPrettyPrinter;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.fasterxml.jackson.databind.ObjectWriter;
  import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
  import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
  import com.fasterxml.jackson.dataformat.xml.util.DefaultXmlPrettyPrinter;
  
  abstract class JacksonFactory {
  
      static class JSON extends JacksonFactory {
  
          @Override
          protected String getPropertNameForContextMap() {
              return JsonConstants.ELT_CONTEXT_MAP;
          }
  
          @Override
          protected String getPropertNameForSource() {
              return JsonConstants.ELT_SOURCE;
          }
  
          @Override
          protected String getPropertNameForNanoTime() {
              return JsonConstants.ELT_NANO_TIME;
          }
  
          @Override
          protected PrettyPrinter newCompactPrinter() {
              return new MinimalPrettyPrinter();
          }
  
          @Override
          protected ObjectMapper newObjectMapper() {
              return new Log4jJsonObjectMapper();
          }
  
          @Override
          protected PrettyPrinter newPrettyPrinter() {
              return new DefaultPrettyPrinter();
          }
      }
  
      static class XML extends JacksonFactory {
  
          @Override
          protected String getPropertNameForContextMap() {
              return XmlConstants.ELT_CONTEXT_MAP;
          }
  
          @Override
          protected String getPropertNameForSource() {
              return XmlConstants.ELT_SOURCE;
          }
  
          @Override
          protected String getPropertNameForNanoTime() {
              return JsonConstants.ELT_NANO_TIME;
          }
  
          @Override
          protected PrettyPrinter newCompactPrinter() {
              // Yes, null is the proper answer.
              return null;
          }
  
          @Override
          protected ObjectMapper newObjectMapper() {
              return new Log4jXmlObjectMapper();
          }
  
         @Override
         protected PrettyPrinter newPrettyPrinter() {
             return new DefaultXmlPrettyPrinter();
         }
     }
 
     abstract protected String getPropertNameForContextMap();
 
     abstract protected String getPropertNameForSource();
     
     abstract protected String getPropertNameForNanoTime();
 
     abstract protected PrettyPrinter newCompactPrinter();
 
     abstract protected ObjectMapper newObjectMapper();
 
     abstract protected PrettyPrinter newPrettyPrinter();
 
     ObjectWriter newWriter(final boolean locationInfo, final boolean properties, final boolean compact) {
         final SimpleFilterProvider filters = new SimpleFilterProvider();
         final Set<String> except = new HashSet<>(2);
         if (!locationInfo) {
             except.add(this.getPropertNameForSource());
         }
         if (!properties) {
             except.add(this.getPropertNameForContextMap());
         }
         except.add(this.getPropertNameForNanoTime());
         filters.addFilter(Log4jLogEvent.class.getName(), SimpleBeanPropertyFilter.serializeAllExcept(except));
         final ObjectWriter writer = this.newObjectMapper().writer(compact ? this.newCompactPrinter() : this.newPrettyPrinter());
         return writer.with(filters);
     }
 
 }