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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.bson.codecs.pojo;

import java.util.Objects;
import java.util.function.Consumer;
import java.util.function.Function;

import static org.bson.assertions.Assertions.notNull;

final class Either {

    public static  Either left(final L value) {
        return new Either<>(notNull("value", value), null);
    }

    public static  Either right(final R value) {
        return new Either<>(null, notNull("value", value));
    }

    private final L left;
    private final R right;

    private Either(final L l, final R r) {
        left = l;
        right = r;
    }

    public  T map(final Function lFunc, final Function rFunc) {
        return left != null ? lFunc.apply(left) : rFunc.apply(right);
    }

    public void apply(final Consumer lFunc, final Consumer rFunc) {
        if (left != null){
            lFunc.accept(left);
        }
        if (right != null){
            rFunc.accept(right);
        }
    }

    @Override
    public String toString() {
        return "Either{"
               + "left=" + left
               + ", right=" + right
               + '}';
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Either either = (Either) o;
        return Objects.equals(left, either.left) && Objects.equals(right, either.right);
    }

    @Override
    public int hashCode() {
        return Objects.hash(left, right);
    }
}