blog-software-java/src/main/java/eu/m724/blog/compress/FileCompressor.java

/*
 * Copyright (c) 2025  blog-software-java developers
 * blog-software-java is licensed under the GNU General Public License. See the LICENSE.md file
 * in the project root for the full license text.
 */

package eu.m724.blog.compress;

import org.apache.commons.compress.compressors.CompressorException;
import org.apache.commons.compress.compressors.CompressorStreamFactory;

import java.io.IOException;
import java.nio.file.*;

public class FileCompressor {
    private final String algorithm;

    public FileCompressor(String algorithm) {
        this.algorithm = algorithm;
    }

    public void compress(Path source) throws IOException, CompressorException {
        var destination = source.resolveSibling(source.getFileName() + "." + algorithm);
        compress(source, destination);
    }

    public void compress(Path source, Path destination) throws IOException, CompressorException {
        if (Files.exists(destination))
            throw new FileAlreadyExistsException(destination.toString());
        
        try (
                var outputStream = new CompressorStreamFactory()
                        .createCompressorOutputStream(algorithm, Files.newOutputStream(destination))
        ) {
            Files.copy(source, outputStream);
        }
    }

    public String getAlgorithm() {
        return algorithm;
    }
}