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@serkan-ozal
Created January 30, 2020 18:32
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import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonStreamContext;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
import com.fasterxml.jackson.databind.ser.PropertyWriter;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.fasterxml.jackson.databind.type.*;
/**
* @author serkan
*/
public class JacksonMaxDepthExample {
private static final int MAX_OBJECT_DEPTH_ON_SERIALIZATION = 3;
private static class DepthAwarePropertyFilter extends SimpleBeanPropertyFilter {
private static final String FILTER_ID = "DepthAwarePropertyFilter";
private final int maxDepth;
private DepthAwarePropertyFilter(int maxDepth) {
this.maxDepth = maxDepth;
}
private int calculateDepth(PropertyWriter writer, JsonGenerator jgen) {
JsonStreamContext sc = jgen.getOutputContext();
int depth = -1;
while (sc != null) {
sc = sc.getParent();
depth++;
}
return depth;
}
@Override
public void serializeAsField(Object pojo, JsonGenerator gen, SerializerProvider provider, PropertyWriter writer)
throws Exception {
int depth = calculateDepth(writer, gen);
if (depth <= maxDepth) {
try {
writer.serializeAsField(pojo, gen, provider);
} catch (Throwable t) {
writer.serializeAsOmittedField(pojo, gen, provider);
}
} else {
// comment this if you don't want {} placeholders
writer.serializeAsOmittedField(pojo, gen, provider);
}
}
}
private static class DepthAwareBeanSerializerModifier extends BeanSerializerModifier {
@Override
public JsonSerializer<?> modifySerializer(
SerializationConfig config, BeanDescription desc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyArraySerializer(
SerializationConfig config, ArrayType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyCollectionSerializer(
SerializationConfig config, CollectionType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyCollectionLikeSerializer(
SerializationConfig config, CollectionLikeType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyMapSerializer(
SerializationConfig config, MapType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyMapLikeSerializer(
SerializationConfig config, MapLikeType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyEnumSerializer(
SerializationConfig config, JavaType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
@Override
public JsonSerializer<?> modifyKeySerializer(
SerializationConfig config, JavaType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer.withFilterId(DepthAwarePropertyFilter.FILTER_ID);
}
}
public static void main(String[] args) {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
objectMapper.setFilterProvider(
new SimpleFilterProvider().
addFilter(DepthAwarePropertyFilter.FILTER_ID,
new DepthAwarePropertyFilter(MAX_OBJECT_DEPTH_ON_SERIALIZATION)));
objectMapper.registerModule(new SimpleModule() {
@Override
public void setupModule(SetupContext context) {
super.setupModule(context);
context.addBeanSerializerModifier(new DepthAwareBeanSerializerModifier());
}
});
}
}
@raxetul
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raxetul commented Jan 31, 2020

Neden maksimum derinlik var?

Pardon, amacın kırpmak imiş.
DepthLimittedPropertyFilter gibi bir isim daha güzel olur sanki.

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