Java PropertyBasedCreator-class And Method Code Example
Here is an example of how to use the PropertyBasedCreator
class from the com.fasterxml.jackson.databind package in the Jackson library for Java:
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdValueInstantiator;
import com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.PropertyBasedCreator;
public class Example {
public static void main(String[] args) throws Exception {
ObjectMapper mapper = new ObjectMapper();
String json = "{\"id\":1,\"name\":\"Example\",\"data\":{\"key1\":\"value1\",\"key2\":\"value2\"}}";
MyObject object = mapper.readValue(json, MyObject.class);
System.out.println(object.toString());
}
static class MyObject {
private final int id;
private final String name;
private final Map<String, String> data;
@JsonCreator
public MyObject(@JsonProperty("id") int id,
@JsonProperty("name") String name,
@JsonProperty("data") Map<String, String> data) {
this.id = id;
this.name = name;
this.data = data;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public Map<String, String> getData() {
return data;
}
@Override
public String toString() {
return "MyObject{" +
"id=" + id +
", name='" + name + ''' +
", data=" + data +
'}';
}
}
}
This code creates an instance of the ObjectMapper class, deserialize a json string to MyObject class, which has a property of Map<String, String> data and use JsonCreator and JsonProperty annotation to set the constructors and properties. Finally it prints the resulting object to the console.
The output of this code would be:
MyObject{id=1, name='Example', data={key1=value1, key2=value2}}
You can also create a PropertyBasedCreator instance by yourself and pass it to StdValueInstantiator class.
PropertyBasedCreator creator = new PropertyBasedCreator(new StdValueInstantiator(MyObject.class));
creator.addPropertyCreator(...);
Please note that, in this example, the JsonCreator and JsonProperty annotations are used to configure the constructors and properties. They are necessary to use PropertyBasedCreator class.