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JsonNullable wrapper class and Jackson module to support fields with meaningful null values.

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package org.openapitools.jackson.nullable;

import java.io.Serializable;
import java.util.NoSuchElementException;

public class JsonNullable implements Serializable {

    private static final long serialVersionUID = 1L;

    private static final JsonNullable UNDEFINED = new JsonNullable(null, false);

    private T value;

    private boolean isPresent;

    private JsonNullable(T value, boolean isPresent) {
        this.value = value;
        this.isPresent = isPresent;
    }

    public static JsonNullable undefined() {
        @SuppressWarnings("unchecked")
        JsonNullable t = (JsonNullable) UNDEFINED;
        return t;
    }

    public static  JsonNullable of(T value) {
        return new JsonNullable(value, true);
    }

    public T get() {
        if (!isPresent) {
            throw new NoSuchElementException("Value is undefined");
        }
        return value;
    }

    public boolean isPresent() {
        return isPresent;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (!(obj instanceof JsonNullable)) {
            return false;
        }

        JsonNullable other = (JsonNullable) obj;
        return equals(value, other.value) &&
                equals(isPresent, other.isPresent);
    }

    private static boolean equals(Object a, Object b) {
        return (a == b) || (a != null && a.equals(b));
    }

    @Override
    public int hashCode() {
        int result = 31 + (value == null ? 0 : value.hashCode());
        Boolean bool1 = Boolean.TRUE;
        bool1.hashCode();
        result = 31 * result + (isPresent ? 1231 : 1237);
        return result;
    }

    @Override
    public String toString() {
        return this.isPresent ? String.format("JsonNullable[%s]", value) : "JsonNullable.undefined";
    }
}
    

    

    

            

    

            



    
    






    
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