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−package org.monetdb.util;
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−
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−import org.monetdb.jdbc.MonetConnection;
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−
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−import java.io.BufferedReader;
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−import java.io.IOException;
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−import java.io.OutputStream;
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−import java.nio.charset.Charset;
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−import java.nio.charset.StandardCharsets;
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−import java.nio.file.FileSystems;
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−import java.nio.file.Files;
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−import java.nio.file.Path;
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−import java.nio.file.StandardOpenOption;
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−
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−/**
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− * Sample implement of ON CLIENT handling
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− *
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− * Can be registered with {@link MonetConnection#setUploadHandler(MonetConnection.UploadHandler)}
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− * and {@link MonetConnection#setDownloadHandler(MonetConnection.DownloadHandler)}.
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− * Implements uploads and downloads by reading and writing files on the file system.
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− */
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−public class FileTransferHandler implements MonetConnection.UploadHandler, MonetConnection.DownloadHandler {
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−	private final Path root;
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−	private final boolean utf8Encoded;
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−
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−	/**
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−	 * Create a new FileTransferHandler which serves the given directory.
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−	 *
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−	 * @param dir directory to read and write files from
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−	 * @param utf8Encoded set this to true if all files in the directory are known to be utf-8 encoded.
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−	 */
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−	public FileTransferHandler(Path dir, boolean utf8Encoded) {
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−		root = dir.toAbsolutePath().normalize();
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−		this.utf8Encoded = utf8Encoded;
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−	}
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−
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−	/**
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−	 * Create a new FileTransferHandler which serves the given directory.
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−	 *
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−	 * @param dir directory to read and write files from
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−	 * @param utf8Encoded set this to true if all files in the directory are known to be utf-8 encoded.
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−	 */
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−	public FileTransferHandler(String dir, boolean utf8Encoded) {
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−		this(FileSystems.getDefault().getPath(dir), utf8Encoded);
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−	}
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−
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−	public void handleUpload(MonetConnection.Upload handle, String name, boolean textMode, int offset) throws IOException {
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−		Path path = root.resolve(name).normalize();
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−		if (!path.startsWith(root)) {
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−			handle.sendError("File is not in upload directory");
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−			return;
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−		}
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−		if (!Files.isReadable(path)) {
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−			handle.sendError("Cannot read " + name);
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−			return;
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−		}
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−		if (textMode && (offset > 1 || !utf8Encoded)) {
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−			Charset encoding = utf8Encoded ? StandardCharsets.UTF_8 : Charset.defaultCharset();
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−			BufferedReader reader = Files.newBufferedReader(path, encoding);
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−			handle.uploadFrom(reader, offset);
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−		} else {
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−			handle.uploadFrom(Files.newInputStream(path));
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−		}
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−	}
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−
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−	public void handleDownload(MonetConnection.Download handle, String name, boolean textMode) throws IOException {
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−		Path path = root.resolve(name).normalize();
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−		if (!path.startsWith(root)) {
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−			handle.sendError("File is not in upload directory");
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−			return;
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−		}
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−		if (!Files.exists(path)) {
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−			handle.sendError("File exists: " + name);
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−			return;
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−		}
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−		OutputStream outputStream = Files.newOutputStream(path, StandardOpenOption.CREATE_NEW);
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−	}
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−}