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Dynamic Dependency Injection with different ways to manage the resolver-strategy
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/*
 * 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 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);
    }

}