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Jersey JSON with Jackson 1.x example.

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/*
 * Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.glassfish.jersey.examples.jackson1;

import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;

import org.codehaus.jackson.map.AnnotationIntrospector;
import org.codehaus.jackson.map.AnnotationIntrospector.Pair;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.SerializationConfig.Feature;
import org.codehaus.jackson.map.introspect.JacksonAnnotationIntrospector;
import org.codehaus.jackson.xc.JaxbAnnotationIntrospector;

/**
 * @author Jakub Podlesak
 */
@Provider
public class MyObjectMapperProvider implements ContextResolver {

    final ObjectMapper defaultObjectMapper;
    final ObjectMapper combinedObjectMapper;

    public MyObjectMapperProvider() {
        defaultObjectMapper = createDefaultMapper();
        combinedObjectMapper = createCombinedObjectMapper();
    }

    @Override
    public ObjectMapper getContext(final Class type) {

        if (type == CombinedAnnotationBean.class) {
            return combinedObjectMapper;
        } else {
            return defaultObjectMapper;
        }
    }

    private static ObjectMapper createCombinedObjectMapper() {
        final Pair combinedIntrospector = createJaxbJacksonAnnotationIntrospector();
        final ObjectMapper result = new ObjectMapper();
        result.configure(SerializationConfig.Feature.WRAP_ROOT_VALUE, true);
        result.configure(DeserializationConfig.Feature.UNWRAP_ROOT_VALUE, true);
        result.setDeserializationConfig(result.getDeserializationConfig().withAnnotationIntrospector(combinedIntrospector));
        result.setSerializationConfig(result.getSerializationConfig().withAnnotationIntrospector(combinedIntrospector));

        return result;
    }

    private static ObjectMapper createDefaultMapper() {

        final ObjectMapper result = new ObjectMapper();
        result.configure(Feature.INDENT_OUTPUT, true);

        return result;
    }

    private static Pair createJaxbJacksonAnnotationIntrospector() {

        final AnnotationIntrospector jaxbIntrospector = new JaxbAnnotationIntrospector();
        final AnnotationIntrospector jacksonIntrospector = new JacksonAnnotationIntrospector();

        return new AnnotationIntrospector.Pair(jacksonIntrospector, jaxbIntrospector);
    }
}