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IT Hit WebDAV integration for new Jakarta Java servlet containers

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package com.ithit.webdav.integration.extendedattributes;

import java.io.IOException;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.UserDefinedFileAttributeView;
import java.util.List;

/**
 * ExtendedAttribute for most platforms using Java's UserDefinedFileAttributeView
 * for extended file attributes.
 */
class DefaultExtendedAttribute implements ExtendedAttribute {

    /**
     * {@inheritDoc}
     */
    @Override
    public void setExtendedAttribute(String path, String attribName, String attribValue) throws IOException {
        final Path sysPath = Paths.get(path);
        FileTime lastWriteTime = Files.getLastModifiedTime(sysPath, LinkOption.NOFOLLOW_LINKS);

        UserDefinedFileAttributeView view = Files
                .getFileAttributeView(sysPath, UserDefinedFileAttributeView.class);
        view.write(attribName, Charset.defaultCharset().encode(attribValue));

        // File modification date should not change when locking and unlocking. Otherwise, client application may think that the file was changed.
        // Preserve last modification date.
        Files.setLastModifiedTime(sysPath, lastWriteTime);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getExtendedAttribute(String path, String attribName) throws IOException {
        UserDefinedFileAttributeView view = Files.getFileAttributeView(Paths.get(path), UserDefinedFileAttributeView.class);

        List attrNames = view.list();
        for (String existAttrName : attrNames) {
            if (existAttrName.equals(attribName)) {
                ByteBuffer buf = ByteBuffer.allocate(view.size(attribName));
                view.read(attribName, buf);
                // Workaround for https://openjdk.org/jeps/247
                ((Buffer) buf).flip();
                return Charset.defaultCharset().decode(buf).toString();
            }
        }

        return null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void deleteExtendedAttribute(String path, String attribName) throws IOException {
        UserDefinedFileAttributeView view = Files
                .getFileAttributeView(Paths.get(path), UserDefinedFileAttributeView.class);
        view.delete(attribName);
    }

}