diff --git a/spring-geode/src/main/java/org/springframework/geode/data/json/converter/support/JacksonObjectToJsonConverter.java b/spring-geode/src/main/java/org/springframework/geode/data/json/converter/support/JacksonObjectToJsonConverter.java new file mode 100644 index 00000000..939e1a9c --- /dev/null +++ b/spring-geode/src/main/java/org/springframework/geode/data/json/converter/support/JacksonObjectToJsonConverter.java @@ -0,0 +1,65 @@ +/* + * Copyright 2020 the original author or authors. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express + * or implied. See the License for the specific language governing + * permissions and limitations under the License. + */ +package org.springframework.geode.data.json.converter.support; + +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.databind.ObjectMapper; + +import org.springframework.core.convert.ConversionFailedException; +import org.springframework.core.convert.TypeDescriptor; +import org.springframework.geode.data.json.converter.ObjectToJsonConverter; +import org.springframework.lang.NonNull; +import org.springframework.lang.Nullable; + +/** + * A {@link ObjectToJsonConverter} implementation using Jackson's {@link ObjectMapper} to convert + * from an {@link Object} to a {@literal JSON} {@link String}. + * + * @author John Blum + * @see com.fasterxml.jackson.databind.ObjectMapper + * @see org.springframework.geode.data.json.converter.ObjectToJsonConverter + * @since 1.3.0 + */ +public class JacksonObjectToJsonConverter implements ObjectToJsonConverter { + + /** + * @inheritDoc + */ + @Nullable @Override + public String convert(Object source) { + + try { + + ObjectMapper objectMapper = newObjectMapper(); + + return objectMapper.writeValueAsString(source); + } + catch (JsonProcessingException cause) { + throw new ConversionFailedException(TypeDescriptor.forObject(source), TypeDescriptor.valueOf(String.class), + source, cause); + } + } + + /** + * Constructs a new instance of the Jackson {@link ObjectMapper} class. + * + * @return a new instance of the Jackson {@link ObjectMapper} class. + * @see com.fasterxml.jackson.databind.ObjectMapper + */ + protected @NonNull ObjectMapper newObjectMapper() { + return new ObjectMapper(); + } +} diff --git a/spring-geode/src/test/java/org/springframework/geode/data/json/converter/support/JacksonObjectToJsonConverterUnitTests.java b/spring-geode/src/test/java/org/springframework/geode/data/json/converter/support/JacksonObjectToJsonConverterUnitTests.java new file mode 100644 index 00000000..02d32c6d --- /dev/null +++ b/spring-geode/src/test/java/org/springframework/geode/data/json/converter/support/JacksonObjectToJsonConverterUnitTests.java @@ -0,0 +1,96 @@ +/* + * Copyright 2020 the original author or authors. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express + * or implied. See the License for the specific language governing + * permissions and limitations under the License. + */ +package org.springframework.geode.data.json.converter.support; + +import static org.assertj.core.api.Assertions.assertThat; +import static org.mockito.ArgumentMatchers.any; +import static org.mockito.ArgumentMatchers.eq; +import static org.mockito.ArgumentMatchers.isNull; +import static org.mockito.Mockito.doReturn; +import static org.mockito.Mockito.doThrow; +import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.spy; +import static org.mockito.Mockito.times; +import static org.mockito.Mockito.verify; + +import com.fasterxml.jackson.core.JsonGenerationException; +import com.fasterxml.jackson.core.JsonGenerator; +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.databind.ObjectMapper; + +import org.junit.Test; + +import org.springframework.core.convert.ConversionFailedException; + +/** + * Unit Tests for {@link JacksonObjectToJsonConverter}. + * + * @author John Blum + * @see org.junit.Test + * @see org.mockito.Mockito + * @see org.springframework.geode.data.json.converter.support.JacksonObjectToJsonConverter + * @since 1.3.0 + */ +public class JacksonObjectToJsonConverterUnitTests { + + @Test + public void convertObjectToJson() throws JsonProcessingException { + + String json = "{ \"name\": \"Jon Doe\" }"; + + Object source = new Object(); + + ObjectMapper mockObjectMapper = mock(ObjectMapper.class); + + JacksonObjectToJsonConverter converter = spy(new JacksonObjectToJsonConverter()); + + doReturn(json).when(mockObjectMapper).writeValueAsString(eq(source)); + doReturn(mockObjectMapper).when(converter).newObjectMapper(); + + assertThat(converter.convert(source)).isEqualTo(json); + + verify(converter, times(1)).newObjectMapper(); + verify(mockObjectMapper, times(1)).writeValueAsString(eq(source)); + } + + @Test(expected = ConversionFailedException.class) + public void convertHandlesJsonProcessingException() throws JsonProcessingException { + + ObjectMapper mockObjectMapper = mock(ObjectMapper.class); + + JacksonObjectToJsonConverter converter = spy(new JacksonObjectToJsonConverter()); + + doReturn(mockObjectMapper).when(converter).newObjectMapper(); + doThrow(new JsonGenerationException("TEST", (JsonGenerator) null)) + .when(mockObjectMapper).writeValueAsString(any()); + + try { + converter.convert(null); + } + catch (ConversionFailedException expected) { + + assertThat(expected.getCause()).isInstanceOf(JsonProcessingException.class); + assertThat(expected.getCause()).hasMessage("TEST"); + assertThat(expected.getCause()).hasNoCause(); + + throw expected; + } + finally { + verify(converter, times(1)).newObjectMapper(); + verify(mockObjectMapper, times(1)).writeValueAsString(isNull()); + } + } +}