JarCastingJackson JSON Interceptor Module
Jackson 2.x module for intercepting and manipulating raw JSON before deserialization and after serialization.
Compatibility
Compiled for Java 6 and tested with Jackson 2.2 - 2.8.
Getting Started with Gradle
dependencies {
compile 'com.github.jonpeterson:jackson-module-json-interceptor:1.0.0'
}
Getting Started with Maven
<dependency>
<groupId>com.github.jonpeterson</groupId>
<artifactId>jackson-module-json-interceptor</artifactId>
<version>1.0.0</version>
</dependency>
Example
Define the POJO models
class CarsByType {
String type
List<Car> data
}
@JsonInterceptors(beforeDeserialization = CarDeserializationInterceptor)
class Car {
String make
String model
int year
}
Define the JSON interceptor
class CarDeserializationInterceptor implements JsonInterceptor {
@Override
JsonNode intercept(JsonNode node, JsonNodeFactory nodeFactory) {
if(node.isTextual()) {
def parts = node.asText().split(':')
def objectNode = nodeFactory.objectNode()
objectNode.put('make', parts[0])
objectNode.put('model', parts[1])
objectNode.put('year', parts[2] as int)
node = objectNode
}
return node
}
}
Test the interceptor
// create the ObjectMapper and load the JSON Interceptor Module
def mapper = new ObjectMapper().registerModule(new JsonInterceptorModule())
// deserialize the data
def cars = mapper.readValue(
// note that Honda Civic is expressed in a packed string and Toyota Camry is expressed in an exploded object
'''{
| "type": "sedans",
| "data": [
| "Honda:Civic:2016",
| {
| "make":"Toyota",
| "model":"Camry",
| "year":2017
| }
| ]
|}'''.stripMargin(),
// class to deserialize as
CarsByType
)
// serialize and compare
assert mapper.writeValueAsString(cars) == '{"type":"sedans","data":[{"make":"Honda","model":"Civic","year":2016},{"make":"Toyota","model":"Camry","year":2017}]}'
See other test cases under src/test/groovy.