/*
 * Copyright (c) 2019 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.common.mapper;

import java.util.Optional;

import io.helidon.common.GenericType;
import io.helidon.common.mapper.spi.MapperProvider;

/**
 * Maps String to Integer, and String to Short using type.
 */
public class ServiceLoaderMapper2 implements MapperProvider {
    static final GenericType<String> STRING_TYPE = GenericType.create(String.class);
    static final GenericType<Integer> INTEGER_TYPE = GenericType.create(Integer.class);
    static final GenericType<Short> SHORT_TYPE = GenericType.create(Short.class);

    @Override
    public <SOURCE, TARGET> Optional<Mapper<?, ?>> mapper(Class<SOURCE> sourceClass, Class<TARGET> targetClass) {
        return Optional.empty();
    }

    @Override
    public <SOURCE, TARGET> Optional<Mapper<?, ?>> mapper(GenericType<SOURCE> sourceType, GenericType<TARGET> targetType) {
        if (sourceType.equals(STRING_TYPE) && targetType.equals(INTEGER_TYPE)) {
            return Optional.of(string -> Integer.parseInt((String)string) + 1);
        }

        if (sourceType.equals(STRING_TYPE) && targetType.equals(SHORT_TYPE)) {
            return Optional.of(string -> Short.parseShort((String)string));
        }
        return Optional.empty();
    }
}
