Include JacksonJsonToObjectConverter, Spring Converter implementation to convert/map JSON to a POJO using Jackson's ObjectMapper.
This commit is contained in:
John Blum
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/*
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* Copyright 2020 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package org.springframework.geode.data.json.converter.support;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.mockito.ArgumentMatchers.anyString;
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import static org.mockito.ArgumentMatchers.eq;
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import static org.mockito.Mockito.doReturn;
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import static org.mockito.Mockito.doThrow;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.never;
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import static org.mockito.Mockito.times;
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import static org.mockito.Mockito.verify;
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import static org.mockito.Mockito.verifyNoInteractions;
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import static org.mockito.Mockito.verifyNoMoreInteractions;
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import com.fasterxml.jackson.core.JsonParseException;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.MapperFeature;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.node.JsonNodeType;
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import com.fasterxml.jackson.databind.node.POJONode;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.mockito.Spy;
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import org.mockito.junit.MockitoJUnitRunner;
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import org.springframework.dao.DataRetrievalFailureException;
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import org.springframework.data.mapping.MappingException;
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import example.app.crm.model.Customer;
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/**
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* Unit Tests for {@link JacksonJsonToObjectConverter}.
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*
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* @author John Blum
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* @see org.junit.Test
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* @see org.mockito.Mockito
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* @see org.mockito.Spy
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* @see org.mockito.junit.MockitoJUnitRunner
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* @see org.springframework.geode.data.json.converter.support.JacksonJsonToObjectConverter
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* @see com.fasterxml.jackson.databind.ObjectMapper
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* @see com.fasterxml.jackson.databind.JsonNode
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* @since 1.3.0
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*/
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@RunWith(MockitoJUnitRunner.class)
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public class JacksonJsonToObjectConverterUnitTests {
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@Spy
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JacksonJsonToObjectConverter converter;
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@Test
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public void objectMapperConfigurationIsCorrect() {
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ObjectMapper objectMapper = this.converter.getObjectMapper();
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assertThat(objectMapper).isNotNull();
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assertThat(objectMapper.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS)).isTrue();
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assertThat(objectMapper.isEnabled(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES)).isFalse();
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assertThat(objectMapper.isEnabled(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)).isFalse();
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}
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@Test
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public void convertingInvalidJsonReturnsNull() {
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assertThat(this.converter.convert((String) null)).isNull();
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assertThat(this.converter.convert("")).isNull();
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assertThat(this.converter.convert(" ")).isNull();
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}
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@Test
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public void convertPojoReturnsPojo() throws JsonProcessingException {
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String json = "{\"id\":1,\"name\":\"Jon Doe\"}";
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POJONode mockJsonNode = mock(POJONode.class);
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ObjectMapper mockObjectMapper = mock(ObjectMapper.class);
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Customer jonDoe = Customer.newCustomer(1L, "Jon Doe");
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doReturn(mockObjectMapper).when(this.converter).getObjectMapper();
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doReturn(mockJsonNode).when(mockObjectMapper).readTree(eq(json));
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doReturn(jonDoe).when(mockJsonNode).getPojo();
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assertThat(this.converter.convert(json)).isEqualTo(jonDoe);
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verify(this.converter, times(1)).getObjectMapper();
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verify(mockObjectMapper, times(1)).readTree(eq(json));
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verify(mockJsonNode, times(1)).getPojo();
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}
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@Test
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public void convertJsonObjectReturnsObject() {
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String json = String.format("{\"@type\":\"%s\",\"id\":2,\"name\":\"Jane Doe\"}", Customer.class.getName());
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Object value = this.converter.convert(json);
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assertThat(value).isInstanceOf(Customer.class);
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Customer janeDoe = (Customer) value;
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assertThat(janeDoe.getId()).isEqualTo(2L);
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assertThat(janeDoe.getName()).isEqualTo("Jane Doe");
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}
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@Test(expected = IllegalStateException.class)
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public void convertJsonArrayThrowsIllegalStateException() throws JsonProcessingException {
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String json = "[]";
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ObjectMapper mockObjectMapper = mock(ObjectMapper.class);
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JsonNode mockJsonNode = mock(JsonNode.class);
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doReturn(mockObjectMapper).when(this.converter).getObjectMapper();
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doReturn(mockJsonNode).when(mockObjectMapper).readTree(eq(json));
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doReturn(false).when(mockJsonNode).isObject();
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try {
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this.converter.convert(json);
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}
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catch (IllegalStateException expected) {
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assertThat(expected).hasMessage("The JSON [%s] must be an object", json);
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assertThat(expected).hasNoCause();
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throw expected;
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}
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finally {
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verify(this.converter, times(1)).getObjectMapper();
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verify(mockObjectMapper, times(1)).readTree(eq(json));
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verify(mockJsonNode, times(1)).isObject();
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verify(mockJsonNode, never()).has(anyString());
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verify(mockJsonNode, never()).get(anyString());
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verifyNoMoreInteractions(mockObjectMapper);
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}
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}
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@Test(expected = IllegalStateException.class)
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public void convertJsonObjectWithNoTypeMetadataThrowsIllegalStateException() throws JsonProcessingException {
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String json = "{\"id\":3,\"name\":\"Pie Doe\"}";
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ObjectMapper mockObjectMapper = mock(ObjectMapper.class);
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JsonNode mockJsonNode = mock(JsonNode.class);
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doReturn(mockObjectMapper).when(this.converter).getObjectMapper();
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doReturn(mockJsonNode).when(mockObjectMapper).readTree(eq(json));
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doReturn(true).when(mockJsonNode).isObject();
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doReturn(false).when(mockJsonNode).has(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME);
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try {
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this.converter.convert(json);
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}
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catch (IllegalStateException expected) {
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assertThat(expected).hasMessage("The JSON object [%s] must have an '@type' metadata field", json);
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assertThat(expected).hasNoCause();
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throw expected;
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}
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finally {
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verify(this.converter, times(1)).getObjectMapper();
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verify(mockObjectMapper, times(1)).readTree(eq(json));
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verify(mockJsonNode, times(1)).isObject();
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verify(mockJsonNode, times(1)).has(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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verify(mockJsonNode, never()).get(anyString());
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verifyNoMoreInteractions(mockObjectMapper);
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}
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}
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@Test(expected = MappingException.class)
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public void convertJsonHandlesClassNotFoundException() throws JsonProcessingException {
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String json = "{\"@type\":\"non.existing.class.Type\",\"id\":4,\"name\":\"Play Doe\"}";
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ObjectMapper mockObjectMapper = mock(ObjectMapper.class);
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JsonNode mockJsonNode = mock(JsonNode.class);
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JsonNode mockAtTypeJsonNode = mock(JsonNode.class);
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doReturn(mockObjectMapper).when(this.converter).getObjectMapper();
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doReturn(mockJsonNode).when(mockObjectMapper).readTree(eq(json));
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doReturn(true).when(mockJsonNode).isObject();
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doReturn(true).when(mockJsonNode).has(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME);
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doReturn(mockAtTypeJsonNode).when(mockJsonNode).get(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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doReturn("non.existing.class.Type").when(mockAtTypeJsonNode).asText();
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try {
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this.converter.convert(json);
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}
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catch (MappingException expected) {
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assertThat(expected)
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.hasMessage("Failed to map JSON [%s] to an Object of type [non.existing.class.Type]", json);
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assertThat(expected).hasCauseInstanceOf(ClassNotFoundException.class);
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assertThat(expected.getCause()).hasMessageContaining("non.existing.class.Type");
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assertThat(expected.getCause()).hasNoCause();
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throw expected;
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}
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finally {
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verify(this.converter, times(1)).getObjectMapper();
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verify(mockObjectMapper, times(1)).readTree(eq(json));
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verify(mockJsonNode, times(1)).isObject();
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verify(mockJsonNode, times(1)).has(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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verify(mockJsonNode, times(1)).get(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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verify(mockAtTypeJsonNode, times(1)).asText();
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verifyNoMoreInteractions(mockObjectMapper);
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}
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}
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@Test(expected = DataRetrievalFailureException.class)
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public void convertJsonHandlesJsonProcessingException() throws JsonProcessingException {
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String json = String.format("{\"@type\":\"%s\",\"id\":5,\"name\":\"Poe Doe\"}", Customer.class.getName());
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ObjectMapper mockObjectMapper = mock(ObjectMapper.class);
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JsonNode mockJsonNode = mock(JsonNode.class);
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JsonNode mockAtTypeJsonNode = mock(JsonNode.class);
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doReturn(mockObjectMapper).when(this.converter).getObjectMapper();
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doReturn(mockJsonNode).when(mockObjectMapper).readTree(eq(json));
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doReturn(true).when(mockJsonNode).isObject();
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doReturn(true).when(mockJsonNode).has(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME);
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doReturn(mockAtTypeJsonNode).when(mockJsonNode).get(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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doReturn(Customer.class.getName()).when(mockAtTypeJsonNode).asText();
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doThrow(new JsonParseException(null, "TEST")).when(mockObjectMapper).readValue(eq(json), eq(Customer.class));
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try {
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this.converter.convert(json);
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}
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catch (DataRetrievalFailureException expected) {
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assertThat(expected).hasMessageContaining("Failed to read JSON [%s]", json);
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assertThat(expected).hasCauseInstanceOf(JsonParseException.class);
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assertThat(expected.getCause()).hasMessage("TEST");
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assertThat(expected.getCause()).hasNoCause();
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throw expected;
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}
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finally {
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verify(this.converter, times(1)).getObjectMapper();
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verify(mockObjectMapper, times(1)).readTree(eq(json));
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verify(mockJsonNode, times(1)).isObject();
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verify(mockJsonNode, times(1)).has(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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verify(mockJsonNode, times(1)).get(eq(JacksonJsonToObjectConverter.AT_TYPE_FIELD_NAME));
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verify(mockAtTypeJsonNode, times(1)).asText();
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verify(mockObjectMapper, times(1)).readValue(eq(json), eq(Customer.class));
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verifyNoMoreInteractions(mockObjectMapper);
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}
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}
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@Test
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public void isPojoWithPojoNode() {
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POJONode mockPojoNode = mock(POJONode.class);
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assertThat(this.converter.isPojo(mockPojoNode)).isTrue();
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verifyNoInteractions(mockPojoNode);
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}
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@Test
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public void isPojoWhenJsonNodeGetNodeTypeReturnsPojo() {
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JsonNode mockJsonNode = mock(JsonNode.class);
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doReturn(JsonNodeType.POJO).when(mockJsonNode).getNodeType();
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assertThat(this.converter.isPojo(mockJsonNode)).isTrue();
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verify(mockJsonNode, times(1)).getNodeType();
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verifyNoMoreInteractions(mockJsonNode);
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}
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@Test
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public void isNotPojoWhenJsonNodeGetNodeTypeReturnsBinary() {
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JsonNode mockJsonNode = mock(JsonNode.class);
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doReturn(JsonNodeType.BINARY).when(mockJsonNode).getNodeType();
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assertThat(this.converter.isPojo(mockJsonNode)).isFalse();
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verify(mockJsonNode, times(2)).getNodeType();
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verifyNoMoreInteractions(mockJsonNode);
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}
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@Test
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public void isNotPojoWithNullIsNullSafe() {
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assertThat(this.converter.isPojo(null)).isFalse();
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}
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}
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