| package org.taverna.server.master; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.taverna.server.master.exceptions.FilesystemAccessException; |
| import org.taverna.server.master.interfaces.File; |
| |
| /** |
| * Simple concatenation of files. |
| * |
| * @author Donal Fellows |
| */ |
| public class FileConcatenation implements Iterable<File> { |
| private List<File> files = new ArrayList<>(); |
| |
| public void add(File f) { |
| files.add(f); |
| } |
| |
| public boolean isEmpty() { |
| return files.isEmpty(); |
| } |
| |
| /** |
| * @return The total length of the files, or -1 if this cannot be |
| * determined. |
| */ |
| public long size() { |
| long size = 0; |
| for (File f : files) |
| try { |
| size += f.getSize(); |
| } catch (FilesystemAccessException e) { |
| // Ignore; shouldn't happen but can't guarantee |
| } |
| return (size == 0 && !files.isEmpty() ? -1 : size); |
| } |
| |
| /** |
| * Get the concatenated files. |
| * |
| * @param encoding |
| * The encoding to use. |
| * @return The concatenated files. |
| * @throws UnsupportedEncodingException |
| * If the encoding doesn't exist. |
| */ |
| public String get(String encoding) throws UnsupportedEncodingException { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| for (File f : files) |
| try { |
| baos.write(f.getContents(0, -1)); |
| } catch (FilesystemAccessException | IOException e) { |
| continue; |
| } |
| return baos.toString(encoding); |
| } |
| |
| @Override |
| public Iterator<File> iterator() { |
| return files.iterator(); |
| } |
| } |