2 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
3 * Copyright (C) $$Year-Rel$$ The Jalview Authors
5 * This file is part of Jalview.
7 * Jalview is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, either version 3
10 * of the License, or (at your option) any later version.
12 * Jalview is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Jalview. If not, see <http://www.gnu.org/licenses/>.
19 * The Jalview Authors are detailed in the 'AUTHORS' file.
23 import java.io.BufferedInputStream;
24 import java.io.BufferedReader;
25 import java.io.ByteArrayInputStream;
27 import java.io.FileInputStream;
28 import java.io.FileReader;
29 import java.io.IOException;
30 import java.io.InputStream;
31 import java.io.InputStreamReader;
32 import java.io.Reader;
33 import java.io.StringReader;
34 import java.net.HttpURLConnection;
35 import java.net.MalformedURLException;
37 import java.net.URLConnection;
38 import java.util.zip.GZIPInputStream;
40 import jalview.api.AlignExportSettingsI;
41 import jalview.api.AlignViewportI;
42 import jalview.api.AlignmentViewPanel;
43 import jalview.api.FeatureSettingsModelI;
44 import jalview.bin.Cache;
45 import jalview.util.MessageManager;
46 import jalview.util.Platform;
49 * implements a random access wrapper around a particular datasource, for
50 * passing to identifyFile and AlignFile objects.
52 public class FileParse
54 protected static final String SPACE = " ";
56 protected static final String TAB = "\t";
59 * text specifying source of data. usually filename or url.
61 private String dataName = "unknown source";
63 public File inFile = null;
65 private byte[] bytes; // from JavaScript
67 public byte[] getBytes()
73 * a viewport associated with the current file operation. May be null. May
74 * move to different object.
76 private AlignViewportI viewport;
79 * specific settings for exporting data from the current context
81 private AlignExportSettingsI exportSettings;
84 * sequence counter for FileParse object created from same data source
89 * separator for extracting specific 'frame' of a datasource for formats that
90 * support multiple records (e.g. BLC, Stockholm, etc)
92 protected char suffixSeparator = '#';
95 * character used to write newlines
97 protected String newline = System.getProperty("line.separator");
99 public void setNewlineString(String nl)
104 public String getNewlineString()
110 * '#' separated string tagged on to end of filename or url that was clipped
111 * off to resolve to valid filename
113 protected String suffix = null;
115 protected DataSourceType dataSourceType = null;
117 protected BufferedReader dataIn = null;
119 protected String errormessage = "UNINITIALISED SOURCE";
121 protected boolean error = true;
123 protected String warningMessage = null;
126 * size of readahead buffer used for when initial stream position is marked.
128 final int READAHEAD_LIMIT = 2048;
135 * Create a new FileParse instance reading from the same datasource starting
136 * at the current position. WARNING! Subsequent reads from either object will
137 * affect the read position of the other, but not the error state.
141 public FileParse(FileParse from) throws IOException
145 throw new Error(MessageManager
146 .getString("error.implementation_error_null_fileparse"));
152 index = ++from.index;
153 inFile = from.inFile;
154 suffixSeparator = from.suffixSeparator;
155 suffix = from.suffix;
156 errormessage = from.errormessage; // inherit potential error messages
157 error = false; // reset any error condition.
158 dataSourceType = from.dataSourceType;
159 dataIn = from.dataIn;
164 dataName = from.dataName;
168 * Attempt to open a file as a datasource. Sets error and errormessage if
169 * fileStr was invalid.
172 * @return this.error (true if the source was invalid)
174 private boolean checkFileSource(String fileStr) throws IOException
177 this.inFile = new File(fileStr);
178 // check to see if it's a Jar file in disguise.
179 if (!inFile.exists())
181 errormessage = "FILE NOT FOUND";
184 if (!inFile.canRead())
186 errormessage = "FILE CANNOT BE OPENED FOR READING";
189 if (inFile.isDirectory())
191 // this is really a 'complex' filetype - but we don't handle directory
193 errormessage = "FILE IS A DIRECTORY";
200 dataIn = checkForGzipStream(new FileInputStream(fileStr));
202 } catch (Exception x)
204 warningMessage = "Failed to resolve " + fileStr
205 + " as a data source. (" + x.getMessage() + ")";
206 // x.printStackTrace();
215 * Recognise the 2-byte magic header for gzip streams
217 * https://recalll.co/ask/v/topic/java-How-to-check-if-InputStream-is-Gzipped/555aadd62bd27354438b90f6
220 * - at least two bytes
222 * @throws IOException
224 public static boolean isGzipStream(InputStream input) throws IOException
226 if (!input.markSupported())
228 Cache.log.error("FileParse.izGzipStream: input stream must support mark/reset");
232 byte[] bytes = { (byte) input.read(), (byte) input.read() }; // input.readNBytes(2);
234 if (bytes.length == 2)
236 int header = (bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);
237 return (GZIPInputStream.GZIP_MAGIC == header);
243 * Returns a Reader for the given input after wrapping it in a buffered input
244 * stream, and then checking if it needs to be wrapped by a GZipInputStream
249 private BufferedReader checkForGzipStream(InputStream input)
253 // https://stackoverflow.com/questions/4818468/how-to-check-if-inputstream-is-gzipped
254 // could use a PushBackInputStream rather than a BufferedInputStream
255 if (!input.markSupported())
257 input = new BufferedInputStream(input, 16);
259 if (isGzipStream(input))
261 return getGzipReader(input);
263 // return a buffered reader for the stream.
264 InputStreamReader isReader = new InputStreamReader(input);
265 BufferedReader toReadFrom = new BufferedReader(isReader);
270 * Returns a {@code BufferedReader} which wraps the input stream with a
271 * GZIPInputStream. Throws a {@code ZipException} if a GZIP format error
272 * occurs or the compression method used is unsupported.
278 private BufferedReader getGzipReader(InputStream inputStream)
281 BufferedReader inData = new BufferedReader(
282 new InputStreamReader(new GZIPInputStream(inputStream)));
290 * Tries to read from the given URL. If successful, saves a reader to the
291 * response in field {@code dataIn}, otherwise (on exception, or HTTP response
292 * status not 200), throws an exception.
294 * If the response status includes
297 * Content-Type : application/x-gzip
300 * then tries to read as gzipped content.
303 * @throws IOException
304 * @throws MalformedURLException
306 private void checkURLSource(String urlStr)
307 throws IOException, MalformedURLException
309 errormessage = "URL NOT FOUND";
310 URL url = new URL(urlStr);
311 URLConnection _conn = url.openConnection();
312 if (_conn instanceof HttpURLConnection)
314 HttpURLConnection conn = (HttpURLConnection) _conn;
315 int rc = conn.getResponseCode();
316 if (rc != HttpURLConnection.HTTP_OK)
318 throw new IOException(
319 "Response status from " + urlStr + " was " + rc);
326 dataIn = checkForGzipStream(_conn.getInputStream());
328 } catch (IOException ex)
330 throw new IOException("Failed to handle non-HTTP URI stream", ex);
331 } catch (Exception ex)
333 throw new IOException(
334 "Failed to determine type of input stream for given URI",
339 String encoding = _conn.getContentEncoding();
340 String contentType = _conn.getContentType();
341 boolean isgzipped = "application/x-gzip".equalsIgnoreCase(contentType)
342 || "gzip".equals(encoding);
344 InputStream inputStream = _conn.getInputStream();
349 dataIn = getGzipReader(inputStream);
351 } catch (Exception e1)
353 throw new IOException(MessageManager
354 .getString("exception.failed_to_resolve_gzip_stream"), e);
359 dataIn = new BufferedReader(new InputStreamReader(inputStream));
365 * sets the suffix string (if any) and returns remainder (if suffix was
369 * @return truncated fileStr or null
371 private String extractSuffix(String fileStr)
373 // first check that there wasn't a suffix string tagged on.
374 int sfpos = fileStr.lastIndexOf(suffixSeparator);
375 if (sfpos > -1 && sfpos < fileStr.length() - 1)
377 suffix = fileStr.substring(sfpos + 1);
378 // System.err.println("DEBUG: Found Suffix:"+suffix);
379 return fileStr.substring(0, sfpos);
385 * not for general use, creates a fileParse object for an existing reader with
386 * configurable values for the origin and the type of the source
388 public FileParse(BufferedReader source, String originString,
389 DataSourceType sourceType)
391 dataSourceType = sourceType;
394 dataName = originString;
398 if (dataIn.markSupported())
400 dataIn.mark(READAHEAD_LIMIT);
402 } catch (IOException q)
409 * Create a datasource for input to Jalview. See AppletFormatAdapter for the
410 * types of sources that are handled.
413 * - datasource locator/content as File or String
415 * - protocol of source
416 * @throws MalformedURLException
417 * @throws IOException
419 public FileParse(Object file, DataSourceType sourceType)
420 throws MalformedURLException, IOException
422 if (file instanceof File)
424 parse((File) file, ((File) file).getPath(), sourceType, true);
428 parse(null, file.toString(), sourceType, false);
432 private void parse(File file, String fileStr, DataSourceType sourceType,
433 boolean isFileObject) throws IOException
435 bytes = Platform.getFileBytes(file);
436 dataSourceType = sourceType;
439 if (sourceType == DataSourceType.FILE)
444 // this will be from JavaScript
446 dataIn = new BufferedReader(
447 new InputStreamReader(new ByteArrayInputStream(bytes)));
450 else if (checkFileSource(fileStr))
452 String suffixLess = extractSuffix(fileStr);
453 if (suffixLess != null)
455 if (checkFileSource(suffixLess))
457 throw new IOException(MessageManager.formatMessage(
458 "exception.problem_opening_file_also_tried",
460 { inFile.getName(), suffixLess, errormessage }));
465 throw new IOException(MessageManager.formatMessage(
466 "exception.problem_opening_file", new String[]
467 { inFile.getName(), errormessage }));
471 else if (sourceType == DataSourceType.RELATIVE_URL)
473 // BH 2018 hack for no support for access-origin
474 bytes = Platform.getFileAsBytes(fileStr);
475 dataIn = new BufferedReader(
476 new InputStreamReader(new ByteArrayInputStream(bytes)));
480 else if (sourceType == DataSourceType.URL)
486 checkURLSource(fileStr);
487 if (suffixSeparator == '#')
489 extractSuffix(fileStr); // URL lref is stored for later reference.
491 } catch (IOException e)
493 String suffixLess = extractSuffix(fileStr);
494 if (suffixLess == null)
502 checkURLSource(suffixLess);
503 } catch (IOException e2)
505 errormessage = "BAD URL WITH OR WITHOUT SUFFIX";
506 throw (e); // just pass back original - everything was wrong.
510 } catch (Exception e)
512 errormessage = "CANNOT ACCESS DATA AT URL '" + fileStr + "' ("
513 + e.getMessage() + ")";
517 else if (sourceType == DataSourceType.PASTE)
519 errormessage = "PASTE INACCESSIBLE!";
520 dataIn = new BufferedReader(new StringReader(fileStr));
523 else if (sourceType == DataSourceType.CLASSLOADER)
525 errormessage = "RESOURCE CANNOT BE LOCATED";
526 InputStream is = getClass().getResourceAsStream("/" + fileStr);
529 String suffixLess = extractSuffix(fileStr);
530 if (suffixLess != null)
532 is = getClass().getResourceAsStream("/" + suffixLess);
537 dataIn = new BufferedReader(new InputStreamReader(is));
547 errormessage = "PROBABLE IMPLEMENTATION ERROR : Datasource Type given as '"
548 + (sourceType != null ? sourceType : "null") + "'";
551 if (dataIn == null || error)
553 // pass up the reason why we have no source to read from
554 throw new IOException(MessageManager.formatMessage(
555 "exception.failed_to_read_data_from_source", new String[]
559 dataIn.mark(READAHEAD_LIMIT);
563 * mark the current position in the source as start for the purposes of it
564 * being analysed by IdentifyFile().identify
566 * @throws IOException
568 public void mark() throws IOException
572 dataIn.mark(READAHEAD_LIMIT);
576 throw new IOException(
577 MessageManager.getString("exception.no_init_source_stream"));
581 public String nextLine() throws IOException
585 return dataIn.readLine();
587 throw new IOException(MessageManager
588 .formatMessage("exception.invalid_source_stream", new String[]
594 * @return true if this FileParse is configured for Export only
596 public boolean isExporting()
598 return !error && dataIn == null;
603 * @return true if the data source is valid
605 public boolean isValid()
611 * closes the datasource and tidies up. source will be left in an error state
613 public void close() throws IOException
615 errormessage = "EXCEPTION ON CLOSE";
619 errormessage = "SOURCE IS CLOSED";
623 * Rewinds the datasource to the marked point if possible
628 public void reset(int bytesRead) throws IOException
630 if (bytesRead >= READAHEAD_LIMIT)
632 System.err.println(String.format(
633 "File reset error: read %d bytes but reset limit is %d",
634 bytesRead, READAHEAD_LIMIT));
636 if (dataIn != null && !error)
642 throw new IOException(MessageManager.getString(
643 "error.implementation_error_reset_called_for_invalid_source"));
649 * @return true if there is a warning for the user
651 public boolean hasWarningMessage()
653 return (warningMessage != null && warningMessage.length() > 0);
658 * @return empty string or warning message about file that was just parsed.
660 public String getWarningMessage()
662 return warningMessage;
665 public String getInFile()
669 return inFile.getAbsolutePath() + " (" + index + ")";
673 return "From Paste + (" + index + ")";
678 * @return the dataName
680 public String getDataName()
686 * set the (human readable) name or URI for this datasource
690 protected void setDataName(String dataname)
696 * get the underlying bufferedReader for this data source.
698 * @return null if no reader available
699 * @throws IOException
701 public Reader getReader()
703 if (dataIn != null) // Probably don't need to test for readiness &&
711 public AlignViewportI getViewport()
716 public void setViewport(AlignViewportI viewport)
718 this.viewport = viewport;
722 * @return the currently configured exportSettings for writing data.
724 public AlignExportSettingsI getExportSettings()
726 return exportSettings;
730 * Set configuration for export of data.
732 * @param exportSettings
733 * the exportSettings to set
735 public void setExportSettings(AlignExportSettingsI exportSettings)
737 this.exportSettings = exportSettings;
741 * method overridden by complex file exporter/importers which support
742 * exporting visualisation and layout settings for a view
746 public void configureForView(AlignmentViewPanel avpanel)
750 setViewport(avpanel.getAlignViewport());
752 // could also set export/import settings
756 * Returns the preferred feature colour configuration if there is one, else
761 public FeatureSettingsModelI getFeatureColourScheme()
766 public DataSourceType getDataSourceType()
768 return dataSourceType;
772 * Returns a buffered reader for the input object. Returns null, or throws
773 * IOException, on failure.
776 * a File, or a String which is a name of a file
779 * @throws IOException
781 public BufferedReader getBufferedReader(Object file,
782 DataSourceType sourceType) throws IOException
784 BufferedReader in = null;
790 if (file instanceof String)
792 return new BufferedReader(new FileReader((String) file));
794 bytes = Platform.getFileBytes((File) file);
797 return new BufferedReader(
798 new InputStreamReader(new ByteArrayInputStream(bytes)));
800 return new BufferedReader(new FileReader((File) file));
802 URL url = new URL(file.toString());
803 in = new BufferedReader(new InputStreamReader(url.openStream()));
805 case RELATIVE_URL: // JalviewJS only
806 bytes = Platform.getFileAsBytes(file.toString());
809 in = new BufferedReader(
810 new InputStreamReader(new ByteArrayInputStream(bytes)));
814 in = new BufferedReader(new StringReader(file.toString()));
817 InputStream is = getClass().getResourceAsStream("/" + file);
820 in = new BufferedReader(new InputStreamReader(is));