001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2024-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.common.convert;
019
020import java.io.IOException;
021import java.util.Optional;
022import java.util.function.Function;
023
024public class ObjectConverter<X, Y> implements ObjectClassConverter<X> {
025
026    // See also ObjectToStringWithToStringBiConverter, which is similar, but the "opposite"
027
028    private final Class<Y> to;
029    private final Class<X> from;
030    protected Function<X, Y> converter;
031
032    public ObjectConverter(Class<X> from, Class<Y> to, Function<X, Y> converter) {
033        this.to = to;
034        this.from = from;
035        this.converter = converter;
036    }
037
038    @Override
039    public <T> Optional<T> convertToType(X input, Class<T> type) throws IOException {
040        // See also ObjectToStringBiConverter's & other similar convertToType() implementations
041        // TODO Re-consider class.equals -VS- isAssignableFrom, here & in ObjectToStringBiConverter
042        if (to.equals(type) && input != null && from.equals(input.getClass())) {
043            return Optional.of((T) converter.apply(input));
044        }
045        return Optional.empty();
046    }
047}