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Converters and Comprehenders for FunctionalJava

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package com.aol.cyclops.functionaljava.comprehenders;

import java.util.function.Function;
import java.util.function.Predicate;

import com.aol.cyclops.types.extensability.Comprehender;
import com.aol.cyclops.types.extensability.ValueComprehender;

import fj.data.Either;
import fj.data.Option;

public class EitherComprehender implements ValueComprehender {

    public Object filter(Either t, Predicate p) {
        return t.right()
                .filter(x -> p.test(x));
    }

    @Override
    public Object map(Either t, Function fn) {
        return t.right()
                .map(e -> fn.apply(e));
    }

    @Override
    public Object flatMap(Either t, Function fn) {
        return t.right()
                .bind(e -> fn.apply(e));
    }

    @Override
    public Either of(Object o) {
        return Either.right(o);
    }

    @Override
    public Either empty() {
        return Either.right(Option.none());
    }

    @Override
    public Class getTargetClass() {
        return Either.class;
    }

    public Object resolveForCrossTypeFlatMap(Comprehender comp, Either apply) {
        if (apply.isRight())
            return comp.of(apply.right()
                                .value());
        return comp.empty();
    }
}