/*
 * Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * 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 io.helidon.config.tests.module.mappers2;

import java.util.OptionalInt;
import java.util.function.Function;

import io.helidon.config.Config;
import io.helidon.config.ConfigMappingException;
import io.helidon.config.MissingValueException;

/**
 * Config mapper implementation for {@link OptionalInt}, but returns a value minus 1.
 */
public class OptionalIntConfigMapper implements Function<Config, OptionalInt> {

    @Override
    public OptionalInt apply(Config config) throws ConfigMappingException, MissingValueException {
        if (config.type() == Config.Type.MISSING) {
            return OptionalInt.empty();
        }

        return OptionalInt.of(Integer.parseInt(config.asString().get()) - 1);
    }

}
