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package com.swak.core.web;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;

import java.io.IOException;
import java.util.List;

import static com.swak.core.web.JacksonSerializerFeatureCompatible.SerializerFeature.*;


public class JacksonSerializerFeatureCompatible extends BeanSerializerModifier {

    private final JsonSerializer nullBooleanJsonSerializer;
    final private JsonSerializer nullNumberJsonSerializer;
    final private JsonSerializer nullListJsonSerializer;
    final private JsonSerializer nullStringJsonSerializer;

    public JacksonSerializerFeatureCompatible(SerializerFeature... features) {
        int config = 0;
        for (SerializerFeature feature : features) {
            config |= feature.mask;
        }
        nullBooleanJsonSerializer = (config & WriteNullBooleanAsFalse.mask) != 0 ? new NullBooleanSerializer() : null;
        nullNumberJsonSerializer = (config & WriteNullNumberAsZero.mask) != 0 ? new NullNumberSerializer() : null;
        nullListJsonSerializer = (config & WriteNullListAsEmpty.mask) != 0 ? new NullListJsonSerializer() : null;
        nullStringJsonSerializer = (config & WriteNullStringAsEmpty.mask) != 0 ? new NullStringSerializer() : null;
    }
    @Override
    public List changeProperties(SerializationConfig config, BeanDescription beanDesc, List beanProperties) {
        for (BeanPropertyWriter writer : beanProperties) {
            final JavaType javaType = writer.getType();
            final Class rawClass = javaType.getRawClass();
            if (javaType.isArrayType() || javaType.isCollectionLikeType()) {
                writer.assignNullSerializer(nullListJsonSerializer);
            } else if (Number.class.isAssignableFrom(rawClass) && rawClass.getName().startsWith("java.lang")) {
                writer.assignNullSerializer(nullNumberJsonSerializer);
            } else if (Boolean.class.equals(rawClass)) {
                writer.assignNullSerializer(nullBooleanJsonSerializer);
            } else if (String.class.equals(rawClass)) {
                writer.assignNullSerializer(nullStringJsonSerializer);
            }
        }
        return beanProperties;
    }

    private static class NullListJsonSerializer extends JsonSerializer {
        @Override
        public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
            jgen.writeStartArray();
            jgen.writeEndArray();
        }
    }

    private static class NullNumberSerializer extends JsonSerializer {
        @Override
        public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
            jgen.writeNumber(0);
        }
    }

    private static class NullBooleanSerializer extends JsonSerializer {
        @Override
        public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
            jgen.writeBoolean(false);
        }
    }

    private static class NullStringSerializer extends JsonSerializer {
        @Override
        public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
            jgen.writeString("");
        }
    }

   public static enum SerializerFeature {
        WriteNullListAsEmpty,
        WriteNullStringAsEmpty,
        WriteNullNumberAsZero,
        WriteNullBooleanAsFalse;

        public final int mask;

        SerializerFeature() {
            mask = (1 << ordinal());
        }
    }
}
    

    

    

            

    

            



    
    






    
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