Data.java

// Copyright (c) 2023 Tobias Briones. All rights reserved.
// SPDX-License-Identifier: BSD-3-Clause
// This file is part of https://github.com/tobiasbriones/blog

package engineer.mathsoftware.blog.slides.data;

import java.io.File;
import java.nio.file.Path;
import java.util.Collection;
import java.util.List;
import java.util.stream.Stream;

public final class Data {
    private static final String EXTENSION_DOT = ".";
    private static final String[] supportedExtensions = {
        "png", "jpg"
    };

    public static boolean isFileSupported(Path path) {
        var filter = filterValidNames(Stream
            .of(path)
            .map(Path::getFileName)
            .map(Path::toString)
        );
        return filter.size() == 1;
    }

    public static boolean areValidImageFiles(Collection<? extends File> files) {
        var filter = filterValidNames(files.stream().map(File::getName));
        return filter.size() == files.size();
    }

    private static List<String> filterValidNames(Stream<String> name) {
        var valid = List.of(supportedExtensions);
        return name
            .filter(x -> x.contains(EXTENSION_DOT))
            .map(x -> x.substring(x.lastIndexOf(EXTENSION_DOT) + 1))
            .filter(valid::contains)
            .toList();
    }

    private Data() {}
}

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