Java AnnotatedCreatorCollector-class And Method Code Example


Here is an example of how to use the AnnotatedCreatorCollector class in the com.fasterxml.jackson.databind package to collect the constructor, factory method, and property-based creators annotated with JsonCreator annotation:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotatedConstructor;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
import com.fasterxml.jackson.databind.introspect.AnnotatedParameter;
import com.fasterxml.jackson.annotation.JsonCreator;

public class Example {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();

        Annotated annotated = mapper.getDeserializationConfig().introspect(Person.class);
        AnnotatedCreatorCollector collector = new AnnotatedCreatorCollector(annotated);
        // Collect all the constructor, factory method, and property-based creators annotated with @JsonCreator
        collector.collectCreators(annotated, JsonCreator.class);
        // Print the constructor, factory method, and property-based creators
        System.out.println("Constructors:");
        for (AnnotatedConstructor ctor : collector.getAnnotatedConstructors()) {
            System.out.println("\t" + ctor);
        }
        System.out.println("Factory Methods:");
        for (AnnotatedMethod factory : collector.getAnnotatedFactoryMethods()) {
            System.out.println("\t" + factory);
        }
        System.out.println("Property-based creators:");
        for (AnnotatedMethod creator : collector.getAnnotatedWithCreator()) {
            System.out.println("\t" + creator);
        }
    }
}

class Person {
    private String name;
    private int age;

    @JsonCreator
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @JsonCreator
    public static Person create(String name, int age) {
        return new Person(name, age);
    }
    @JsonCreator
    public void setData(String name, int age) {
        this.name = name;
        this.age = age;
    }
    // getters and setters
}

In this example, an instance of the ObjectMapper class is used to create an instance of AnnotatedCreatorCollector. The collectCreators() method is used to collect all the constructor, factory method, and property-based creators annotated with JsonCreator. The collected creators are then printed to the console.

It's important to notice that this is a basic example, and you may need to adapt it to your specific use case and configuration. Also, the AnnotatedCreatorCollector is not a class that you need to instantiate, it is used