/*

* Jooby https://jooby.io

* Apache License Version 2.0 https://jooby.io/LICENSE.txt

* Copyright 2014 Edgar Espina

*/

package io.jooby;

import java.util.*;

/**

* A wrapper for a value and its associated {@link Projection}.

*

* @param <T> The value type.

* @author edgar

* @since 4.0.0

*/

public class Projected<T> {

private final T value;

private final Projection<T> projection;

private Projected(T value, Projection<T> projection) {

this.value = value;

this.projection = projection;

}

@SuppressWarnings("unchecked")

public static <T> Projected<T> wrap(T value) {

return new Projected<T>(value, Projection.of(computeProjectionType(value)));

}

@SuppressWarnings("rawtypes")

private static Class computeProjectionType(Object value) {

return switch (value) {

case Set<?> col -> col.isEmpty() ? Object.class : col.iterator().next().getClass();

case Collection<?> col -> col.isEmpty() ? Object.class : col.iterator().next().getClass();

case Optional<?> optional -> optional.isEmpty() ? Object.class : optional.get().getClass();

default -> value.getClass();

};

}

public static <T> Projected<T> wrap(T value, Projection<T> projection) {

return new Projected<>(value, projection);

}

public T getValue() {

return value;

}

public Projection<T> getProjection() {

return projection;

}

public Projected<T> include(String... paths) {

projection.include(paths);

return this;

}

@Override

public String toString() {

return projection.toString();

}

}