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package io.jenetics.ext.moea;

import static java.util.Objects.requireNonNull;

import java.util.Arrays;
import java.util.Comparator;

final class SimpleObjectVec implements Vec {
	private final T[] _data;
	private final Comparator _comparator;
	private final ElementDistance _distance;

	SimpleObjectVec(
		final T[] data,
		final Comparator comparator,
		final ElementDistance distance
	) {
		Vecs.checkVecLength(data.length);
		_data = data;
		_comparator = requireNonNull(comparator);
		_distance = requireNonNull(distance);
	}

	@Override
	public T[] data() {
		return _data;
	}

	@Override
	public int length() {
		return _data.length;
	}

	@Override
	public ElementComparator comparator() {
		return (u, v, i) -> _comparator.compare(u[i], v[i]);
	}

	@Override
	public ElementDistance distance() {
		return _distance;
	}

	@Override
	public Comparator dominance() {
		return (u, v) -> Vec.dominance(u, v, _comparator);
	}

	@Override
	public int hashCode() {
		return Arrays.hashCode(_data);
	}

	@Override
	public boolean equals(final Object obj) {
		return obj == this ||
			obj instanceof SimpleObjectVec other &&
			Arrays.equals(other._data, _data);
	}

	@Override
	public String toString() {
		return Arrays.toString(_data);
	}

}