Merge pull request #2 from connorbo97/override-read-unknowns-config

add flag to SerializationConfig to disable READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE config

Author: henryabra

src/main/java/com/taboola/rest/api/internal/config/SerializationConfig.java

@@ -6,10 +6,12 @@
 public class SerializationConfig {
     private Map<Class<?>, Class<?>> mixins;
     private boolean shouldIgnoreAnySetterAnnotation;
+    private boolean shouldDisableReadUnknownEnumValuesAsDefaultValue;
 
     public SerializationConfig() {
         mixins = new HashMap<>();
         shouldIgnoreAnySetterAnnotation = false;
+        shouldDisableReadUnknownEnumValuesAsDefaultValue = false;
     }
 
     public SerializationConfig setMixins(Map<Class<?>, Class<?>> mixins) {
@@ -22,13 +24,21 @@ public SerializationConfig setShouldIgnoreAnySetterAnnotation() {
         return this;
     }
 
+    public SerializationConfig setShouldDisableReadUnknownEnumValuesAsDefaultValue() {
+        this.shouldDisableReadUnknownEnumValuesAsDefaultValue = true;
+        return this;
+    }
+
     public Map<Class<?>, Class<?>> getMixins() {
         return mixins;
     }
 
     public boolean shouldIgnoreAnySetterAnnotation() {
         return shouldIgnoreAnySetterAnnotation;
     }
+    public boolean shouldDisableReadUnknownEnumValuesAsDefaultValue() {
+        return shouldDisableReadUnknownEnumValuesAsDefaultValue;
+    }
 
     @Override
     public String toString() {

src/main/java/com/taboola/rest/api/internal/serialization/SerializationMapperCreator.java

@@ -12,7 +12,11 @@ public static ObjectMapper createObjectMapper(SerializationConfig serializationC
         objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES);
         objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
         objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
-        objectMapper.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE, true);
+
+        if (!serializationConfig.shouldDisableReadUnknownEnumValuesAsDefaultValue()) {
+            objectMapper.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE, true);
+        }
+
         serializationConfig.getMixins().forEach(objectMapper::addMixIn);
 
         if (serializationConfig.shouldIgnoreAnySetterAnnotation()) {

src/test/java/com/taboola/rest/api/internal/serialization/SerializationMapperCreatorTest.java

@@ -1,10 +1,12 @@
 package com.taboola.rest.api.internal.serialization;
 
 import com.fasterxml.jackson.annotation.JsonAnySetter;
+import com.fasterxml.jackson.annotation.JsonEnumDefaultValue;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import com.fasterxml.jackson.databind.exc.InvalidFormatException;
 import com.taboola.rest.api.internal.config.SerializationConfig;
 
 import org.junit.Assert;
@@ -68,17 +70,82 @@ public void createObjectMapper_serializationConfigWithIgnoreAnySetterAndApiObjec
         Assert.assertNull("Name is parsed incorrectly", sampleApi.name);
     }
 
+    @Test
+    public void createObjectMapper_defaultSerializationConfigAndApiObjectHasValidEnum_enumParsedCorrectly() throws IOException {
+        SerializationConfig serializationConfig = new SerializationConfig();
+        ObjectMapper objectMapper = SerializationMapperCreator.createObjectMapper(serializationConfig);
+
+        SampleApi sampleApi = objectMapper.readValue("{ \"letter\": \"B\" }", SampleApi.class);
+
+        Assert.assertEquals("Unknown enum is parsed incorrectly", SampleEnum.B, sampleApi.letter);
+    }
+
+    @Test
+    public void createObjectMapper_defaultSerializationConfigAndApiObjectHasInvalidEnum_defaultValueUsedOnSerialization() throws IOException {
+        SerializationConfig serializationConfig = new SerializationConfig();
+        ObjectMapper objectMapper = SerializationMapperCreator.createObjectMapper(serializationConfig);
+
+        SampleApi sampleApi = objectMapper.readValue("{ \"letter\": \"D\" }", SampleApi.class);
+
+        Assert.assertEquals("Unknown enum is parsed incorrectly", SampleEnum.UNKNOWN, sampleApi.letter);
+    }
+
+    @Test
+    public void createObjectMapper_defaultSerializationConfigAndApiObjectHasEmptyEnumValue_defaultValueUsedOnSerialization() throws IOException {
+        SerializationConfig serializationConfig = new SerializationConfig();
+        ObjectMapper objectMapper = SerializationMapperCreator.createObjectMapper(serializationConfig);
+
+        SampleApi sampleApi = objectMapper.readValue("{ \"letter\": \"D\" }", SampleApi.class);
+
+        Assert.assertEquals("Unknown enum is parsed incorrectly", SampleEnum.UNKNOWN, sampleApi.letter);
+    }
+
+    @Test
+    public void createObjectMapper_serializationConfigWithReadUnknownEnumsDisabledAndApiObjectHasValidEnum_enumParsedCorrectly() throws IOException {
+        SerializationConfig serializationConfig = new SerializationConfig().setShouldDisableReadUnknownEnumValuesAsDefaultValue();
+        ObjectMapper objectMapper = SerializationMapperCreator.createObjectMapper(serializationConfig);
+
+        SampleApi sampleApi = objectMapper.readValue("{ \"letter\": \"B\" }", SampleApi.class);
+
+        Assert.assertEquals("Unknown enum is parsed incorrectly", SampleEnum.B, sampleApi.letter);
+    }
+
+    @Test(expected = InvalidFormatException.class)
+    public void createObjectMapper_serializationConfigWithReadUnknownEnumsDisabledAndApiObjectHasInvalidEnum_InvalidFormatExceptionIsThrown() throws IOException {
+        SerializationConfig serializationConfig = new SerializationConfig().setShouldDisableReadUnknownEnumValuesAsDefaultValue();
+        ObjectMapper objectMapper = SerializationMapperCreator.createObjectMapper(serializationConfig);
+
+        objectMapper.readValue("{ \"letter\": \"D\" }", SampleApi.class);
+    }
+
+    @Test(expected = InvalidFormatException.class)
+    public void createObjectMapper_serializationConfigWithReadUnknownEnumsDisabledAndApiObjectHasEmptyEnumValue_InvalidFormatExceptionIsThrown() throws IOException {
+        SerializationConfig serializationConfig = new SerializationConfig().setShouldDisableReadUnknownEnumValuesAsDefaultValue();
+        ObjectMapper objectMapper = SerializationMapperCreator.createObjectMapper(serializationConfig);
+
+        objectMapper.readValue("{ \"letter\": \"\" }", SampleApi.class);
+    }
+
+    private enum SampleEnum {
+        A, B, @JsonEnumDefaultValue UNKNOWN
+    }
+
     private static class SampleApi {
         @JsonProperty("id")
         int id;
 
+        @JsonProperty("letter")
+        SampleEnum letter;
+
         @JsonProperty("name")
         String name;
 
         @JsonAnySetter
         public void handlerUnknownSetter(String field, Object value) throws Exception {
             throw new Exception("unknown field");
         }
+
+
     }
 
     private abstract class SampleMixIn {