CreateZip.java

package no.difi.sdp.client2.asice.archive;

import no.difi.sdp.client2.asice.AsicEAttachable;
import no.difi.sdp.client2.domain.exceptions.RuntimeIOException;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.commons.compress.utils.Charsets;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.List;

public class CreateZip {

    private final Logger log = LoggerFactory.getLogger(this.getClass());

    public Archive zipIt(List<AsicEAttachable> files) {
        try (ByteArrayOutputStream archive = new ByteArrayOutputStream(); ZipArchiveOutputStream zipOutputStream = new ZipArchiveOutputStream(archive)) {
            zipOutputStream.setEncoding(Charsets.UTF_8.name());
            zipOutputStream.setMethod(ZipArchiveOutputStream.DEFLATED);
            for (AsicEAttachable file : files) {
                log.trace("Adding " + file.getFileName() + " to archive. Size in bytes before compression: " + file.getBytes().length);
                ZipArchiveEntry zipEntry = new ZipArchiveEntry(file.getFileName());
                zipEntry.setSize(file.getBytes().length);

                zipOutputStream.putArchiveEntry(zipEntry);
                IOUtils.write(file.getBytes(), zipOutputStream);
                zipOutputStream.closeArchiveEntry();
            }
            zipOutputStream.finish();
            zipOutputStream.close();

            return new Archive(archive.toByteArray());
        } catch (IOException e) {
            throw new RuntimeIOException(e);
        }
    }
}