ObjectFilterModifierConditional.java example

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Resteasy-master
package org.jboss.resteasy.test.providers.jackson2.jsonfilter.resource;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.PropertyFilter;
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.jaxrs.cfg.EndpointConfigBase;
import com.fasterxml.jackson.jaxrs.cfg.ObjectWriterModifier;

import javax.ws.rs.core.MultivaluedMap;
import java.io.IOException;

public class ObjectFilterModifierConditional extends ObjectWriterModifier {
    @Override
    public ObjectWriter modify(EndpointConfigBase<?> endpointConfigBase, MultivaluedMap<String, Object> multivaluedMap,
                               Object o, ObjectWriter objectWriter, JsonGenerator jsonGenerator) throws IOException {

        PropertyFilter theFilter = new SimpleBeanPropertyFilter() {
            @Override
            public void serializeAsField
                    (Object pojo, JsonGenerator jgen, SerializerProvider provider, PropertyWriter writer)
                    throws Exception {
                if (include(writer)) {
                    if (!writer.getName().equals("id")) {
                        writer.serializeAsField(pojo, jgen, provider);
                        return;
                    }
                    int intValue = ((Jackson2Product) pojo).getId();
                    if (intValue >= 0) {
                        writer.serializeAsField(pojo, jgen, provider);
                    }
                } else if (!jgen.canOmitFields()) { // since 2.3
                    writer.serializeAsOmittedField(pojo, jgen, provider);
                }
            }
            @Override
            protected boolean include(BeanPropertyWriter writer) {
                return true;
            }
            @Override
            protected boolean include(PropertyWriter writer) {
                return true;
            }
        };

        FilterProvider filterProvider = new SimpleFilterProvider().addFilter(
                "nameFilter", theFilter);
        return objectWriter.with(filterProvider);
    }
}