de.ks.flatadocdb.defaults.json.SerializationModule.java Source code

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Here is the source code for de.ks.flatadocdb.defaults.json.SerializationModule.java

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/*
 * Copyright [2015] [Christian Loehnert]
 *
 * Licensed 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 de.ks.flatadocdb.defaults.json;

import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
import de.ks.flatadocdb.annotation.PathInRepository;
import de.ks.flatadocdb.metamodel.EntityDescriptor;
import de.ks.flatadocdb.metamodel.MetaModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class SerializationModule extends Module {
    private static final Logger log = LoggerFactory.getLogger(SerializationModule.class);

    private final MetaModel metaModel;

    public SerializationModule(MetaModel metaModel) {
        this.metaModel = metaModel;
    }

    @Override
    public String getModuleName() {
        return "JSONFilter";
    }

    @Override
    public Version version() {
        return new Version(1, 0, 0, "none", null, null);
    }

    @Override
    public void setupModule(SetupContext context) {
        context.addBeanSerializerModifier(new BeanSerializerModifier() {
            @Override
            public List<BeanPropertyWriter> changeProperties(SerializationConfig config, BeanDescription beanDesc,
                    List<BeanPropertyWriter> beanProperties) {
                if (metaModel.isRegistered(beanDesc.getBeanClass())) {
                    EntityDescriptor entityDescriptor = metaModel.getEntityDescriptor(beanDesc.getBeanClass());

                    List<BeanPropertyWriter> relationProperties = beanProperties.stream()//
                            .filter(p -> entityDescriptor.isRelation(p.getMember())).collect(Collectors.toList());

                    List<BeanPropertyWriter> repoPathProperty = beanProperties.stream()//
                            .filter(p -> p.getAnnotation(PathInRepository.class) != null)
                            .collect(Collectors.toList());

                    ArrayList<BeanPropertyWriter> all = new ArrayList<>(beanProperties);
                    log.trace("Removing {} relation properties fron {}: {}", relationProperties.size(),
                            beanDesc.getBeanClass(), relationProperties);
                    all.removeAll(relationProperties);
                    all.removeAll(repoPathProperty);
                    relationProperties.stream().map(old -> new RelationCollectionPropertyWriter(old, metaModel))
                            .forEach(all::add);
                    return all;
                } else {
                    return beanProperties;
                }
            }
        });

        context.addBeanDeserializerModifier(new BeanDeserializerModifier() {
            @Override
            public List<BeanPropertyDefinition> updateProperties(DeserializationConfig config,
                    BeanDescription beanDesc, List<BeanPropertyDefinition> propDefs) {
                if (metaModel.isRegistered(beanDesc.getBeanClass())) {
                    EntityDescriptor entityDescriptor = metaModel.getEntityDescriptor(beanDesc.getBeanClass());
                    return propDefs.stream()//
                            .filter(p -> !entityDescriptor.isRelation(p.getPrimaryMember()))//
                            .filter(p -> p.getPrimaryMember().getAnnotation(PathInRepository.class) == null)//
                            .collect(Collectors.toList());
                } else {
                    return propDefs;
                }
            }
        });
    }
}