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BAEL-1187 - Mapping Nested Values with Jackson (#2750) 

* BAEL-1187 - Mapping Nested Values with Jackson

* minor naming and formatting changes to align with standards

* update formatting and jackson version
This commit is contained in:
chrisoberle 2017-10-22 13:23:26 -04:00 committed by KevinGilmore
parent d6d6a9edda
commit 3f6dcebdf9
4 changed files with 166 additions and 1 deletions
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2
jackson/pom.xml
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@ -129,7 +129,7 @@
<properties>
<!-- marshalling -->
<jackson.version>2.9.0</jackson.version>
<jackson.version>2.9.2</jackson.version>
<!-- util -->
<guava.version>19.0</guava.version>

70
jackson/src/test/java/com/baeldung/jackson/deserialization/nested/DeserializeWithNestedPropertiesUnitTest.java Normal file
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@ -0,0 +1,70 @@
package com.baeldung.jackson.deserialization.nested;
import static org.junit.Assert.*;
import java.io.IOException;
import org.junit.Test;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
public class DeserializeWithNestedPropertiesUnitTest {
private String SOURCE_JSON = "{\"id\":\"957c43f2-fa2e-42f9-bf75-6e3d5bb6960a\",\"name\":\"The Best Product\",\"brand\":{\"id\":\"9bcd817d-0141-42e6-8f04-e5aaab0980b6\",\"name\":\"ACME Products\",\"owner\":{\"id\":\"b21a80b1-0c09-4be3-9ebd-ea3653511c13\",\"name\":\"Ultimate Corp, Inc.\"}}}";
@Test
public void whenUsingJacksonAnnotations_thenOk() throws IOException {
Product product = new ObjectMapper().readerFor(Product.class)
.readValue(SOURCE_JSON);
assertEquals(product.getName(), "The Best Product");
assertEquals(product.getBrandName(), "ACME Products");
assertEquals(product.getOwnerName(), "Ultimate Corp, Inc.");
}
@Test
public void whenUsingJacksonJsonNode_thenOk() throws IOException {
JsonNode productNode = new ObjectMapper().readTree(SOURCE_JSON);
Product product = new Product();
product.setId(productNode.get("id")
.textValue());
product.setName(productNode.get("name")
.textValue());
product.setBrandName(productNode.get("brand")
.get("name")
.textValue());
product.setOwnerName(productNode.get("brand")
.get("owner")
.get("name")
.textValue());
assertEquals(product.getName(), "The Best Product");
assertEquals(product.getBrandName(), "ACME Products");
assertEquals(product.getOwnerName(), "Ultimate Corp, Inc.");
}
@Test
public void whenUsingJacksonDeserializerManuallyRegistered_thenOk() throws IOException {
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addDeserializer(Product.class, new ProductDeserializer());
mapper.registerModule(module);
Product product = mapper.readValue(SOURCE_JSON, Product.class);
assertEquals(product.getName(), "The Best Product");
assertEquals(product.getBrandName(), "ACME Products");
assertEquals(product.getOwnerName(), "Ultimate Corp, Inc.");
}
@Test
public void whenUsingJacksonDeserializerAutoRegistered_thenOk() throws IOException {
ObjectMapper mapper = new ObjectMapper();
Product product = mapper.readValue(SOURCE_JSON, Product.class);
assertEquals(product.getName(), "The Best Product");
assertEquals(product.getBrandName(), "ACME Products");
assertEquals(product.getOwnerName(), "Ultimate Corp, Inc.");
}
}

55
jackson/src/test/java/com/baeldung/jackson/deserialization/nested/Product.java Normal file
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@ -0,0 +1,55 @@
package com.baeldung.jackson.deserialization.nested;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
@JsonDeserialize(using = ProductDeserializer.class)
public class Product {
private String id;
private String name;
private String brandName;
private String ownerName;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBrandName() {
return brandName;
}
public void setBrandName(String brandName) {
this.brandName = brandName;
}
public String getOwnerName() {
return ownerName;
}
public void setOwnerName(String ownerName) {
this.ownerName = ownerName;
}
@SuppressWarnings("unchecked")
@JsonProperty("brand")
private void unpackNested(Map<String, Object> brand) {
this.brandName = (String) brand.get("name");
Map<String, String> owner = (Map<String, String>) brand.get("owner");
this.ownerName = owner.get("name");
}
}

40
jackson/src/test/java/com/baeldung/jackson/deserialization/nested/ProductDeserializer.java Normal file
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@ -0,0 +1,40 @@
package com.baeldung.jackson.deserialization.nested;
import java.io.IOException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
@SuppressWarnings("serial")
public class ProductDeserializer extends StdDeserializer<Product> {
public ProductDeserializer() {
this(null);
}
public ProductDeserializer(Class<?> vc) {
super(vc);
}
@Override
public Product deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
JsonNode productNode = jp.getCodec()
.readTree(jp);
Product product = new Product();
product.setId(productNode.get("id")
.textValue());
product.setName(productNode.get("name")
.textValue());
product.setBrandName(productNode.get("brand")
.get("name")
.textValue());
product.setOwnerName(productNode.get("brand")
.get("owner")
.get("name")
.textValue());
return product;
}
}