SerializableHolder

import com.google.common.base.Supplier;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;


/**
 * Acts as a {@link com.hazelcast.nio.DataSerializable DataSerializable} wrapper
 * for type that might not have default constructor.
 */
public final class SerializableHolder<T> extends JsonDataSerializable implements Supplier<T> {

    /**
     * Wraps a value to make it serializable.
     */
    public static <T> SerializableHolder<T> of(T contents) {
        return new SerializableHolder<T>(contents);
    }

    /**
     * Default constructor needed in order to be
     * {@link com.hazelcast.nio.DataSerializable DataSerializable}.
     */
    public SerializableHolder() {
        // Nothing to do.
    }

    /**
     * Retrieve the wrapped value.
     */
    @JsonTypeInfo(use=JsonTypeInfo.Id.CLASS)
    @JsonProperty("x")
    public T get() {
        return contents;
    }


    SerializableHolder(T contents) {
        this.contents = contents;
    }

    @JsonProperty("x") private T contents;
}