Java tutorial
/* * #%L * gitools-obo * %% * Copyright (C) 2013 Universitat Pompeu Fabra - Biomedical Genomics group * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. * #L% */ package org.gitools.datasources.obo; import org.apache.commons.net.ftp.FTPClient; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URL; class OBOStream { private URL baseUrl; private BufferedReader reader; private int linePos; public OBOStream(BufferedReader reader) { this.reader = reader; this.linePos = 0; } public OBOStream(URL baseUrl) throws IOException { this.baseUrl = baseUrl; // Workaround for FTP problem connecting ftp.geneontology.org with URL.openStream() if (baseUrl.getProtocol().equalsIgnoreCase("ftp")) { FTPClient ftp = new FTPClient(); if (baseUrl.getPort() != -1) { ftp.connect(baseUrl.getHost(), baseUrl.getPort()); } else { ftp.connect(baseUrl.getHost()); } ftp.login("anonymous", ""); ftp.enterLocalPassiveMode(); ftp.setControlKeepAliveTimeout(60); InputStream is = ftp.retrieveFileStream(baseUrl.getPath()); this.reader = new BufferedReader(new InputStreamReader(is)); } else { this.reader = new BufferedReader(new InputStreamReader(baseUrl.openStream())); } this.linePos = 0; } /** * @noinspection UnusedDeclaration */ public URL getBaseUrl() { return baseUrl; } public BufferedReader getReader() { return reader; } public int getLinePos() { return linePos; } /** * returns a non empty line or null if EOF */ public String nextLine() throws IOException { String line = readLine(); while (line != null && isEmptyLine(line)) line = readLine(); return line; } public void close() throws IOException { if (reader != null) { reader.close(); reader = null; } } /** * returns the next line or null if EOF */ private String readLine() throws IOException { if (reader == null) { return null; } StringBuilder completeLine = new StringBuilder(); String line = reader.readLine(); linePos++; if (line != null) { line = line.trim(); } while (line != null && line.endsWith("\\")) { line = line.substring(0, line.length() - 1); completeLine.append(line); line = reader.readLine(); linePos++; if (line != null) { line = line.trim(); } } if (line != null) { completeLine.append(line); } if (line == null && completeLine.length() == 0) { return null; } return completeLine.toString(); } private boolean isEmptyLine(String line) { return line.replaceAll("\\s", "").isEmpty(); } }