io.gravitee.am.definition.jackson.module.CommonModule Maven / Gradle / Ivy

Go to download
/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.am.definition.jackson.module;

import com.fasterxml.jackson.annotation.JsonRawValue;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.TreeNode;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.std.StringDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class CommonModule extends SimpleModule {

    private static final long serialVersionUID = 1L;

    @SuppressWarnings("unchecked")
    public CommonModule() {
        super("common", new Version(0, 1, 0, null, null, null));

        setDeserializerModifier(new BeanDeserializerModifier() {
            @Override
            public JsonDeserializer modifyEnumDeserializer(DeserializationConfig config,
                                                                 final JavaType type,
                                                                 BeanDescription beanDesc,
                                                                 final JsonDeserializer deserializer) {
                return new JsonDeserializer() {
                    @Override
                    public Enum deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
                        Class rawClass = (Class>) type.getRawClass();
                        return Enum.valueOf(rawClass, jp.getValueAsString().toUpperCase());
                    }
                };
            }
        });

        addSerializer(Enum.class, new StdSerializer(Enum.class) {
            @Override
            public void serialize(Enum value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
                jgen.writeString(value.name().toLowerCase());
            }
        });

        addDeserializer(String.class, new RawValueDeserializer());
    }

    private class RawValueDeserializer extends JsonDeserializer implements ContextualDeserializer {
        @Override
        public String deserialize(JsonParser jp, DeserializationContext ctx) throws IOException {
            TreeNode tree = jp.getCodec().readTree(jp);
            return tree.toString();
        }

        @Override
        public JsonDeserializer createContextual(DeserializationContext ctx,
                                                    BeanProperty property) throws JsonMappingException {
            if (property != null && property.getMember().getAnnotation(JsonRawValue.class) != null) {
                return this;
            }
            return new StringDeserializer();
        }
    }

    @Override
    public String getModuleName() {
        // yes, will try to avoid duplicate registrations (if MapperFeature enabled)
        return getClass().getSimpleName();
    }

    @Override
    public int hashCode() {
        return getClass().hashCode();
    }

    @Override
    public boolean equals(Object o) {
        return this == o;
    }
}