Java tutorial
/* * ------------------------------------------------------------------------ * Copyright by KNIME GmbH, Konstanz, Germany * Website: http://www.knime.org; Email: contact@knime.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, Version 3, as * published by the Free Software Foundation. * * 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>. * * Additional permission under GNU GPL version 3 section 7: * * KNIME interoperates with ECLIPSE solely via ECLIPSE's plug-in APIs. * Hence, KNIME and ECLIPSE are both independent programs and are not * derived from each other. Should, however, the interpretation of the * GNU GPL Version 3 ("License") under any applicable laws result in * KNIME and ECLIPSE being a combined program, KNIME GMBH herewith grants * you the additional permission to use and propagate KNIME together with * ECLIPSE with only the license terms in place for ECLIPSE applying to * ECLIPSE and the GNU GPL Version 3 applying for KNIME, provided the * license terms of ECLIPSE themselves allow for the respective use and * propagation of ECLIPSE together with KNIME. * * Additional permission relating to nodes for KNIME that extend the Node * Extension (and in particular that are based on subclasses of NodeModel, * NodeDialog, and NodeView) and that only interoperate with KNIME through * standard APIs ("Nodes"): * Nodes are deemed to be separate and independent programs and to not be * covered works. Notwithstanding anything to the contrary in the * License, the License does not apply to Nodes, you are not required to * license Nodes under the License, and you are granted a license to * prepare and propagate Nodes, in each case even if such Nodes are * propagated with or for interoperation with KNIME. The owner of a Node * may freely choose the license terms applicable to such Node, including * when such Node is propagated with or for interoperation with KNIME. * ------------------------------------------------------------------------ * * History * 16.03.2012 (hofer): created */ package de.pavloff.spark4knime.jsnippet; import java.io.File; import java.net.MalformedURLException; import java.net.URL; import org.apache.commons.lang3.StringUtils; import org.knime.core.node.InvalidSettingsException; import org.knime.core.node.util.CheckUtils; import org.knime.core.util.FileUtil; /** * Utility method for the Java Snippet nodes. * * @author Heiko Hofer */ public final class JavaSnippetUtil { private JavaSnippetUtil() { // private constructor to prevent instantiation. } /** Convert file location to File. Also accepts file in URL format * (e.g. local drop files as URL). * @param location The location string. * @return The file to the location * @throws InvalidSettingsException if argument is null, empty or the file * does not exist. */ public static final File toFile(final String location) throws InvalidSettingsException { CheckUtils.checkSetting(StringUtils.isNotEmpty(location), "Invalid (empty) jar file location"); File result; URL url = null; try { url = new URL(location); } catch (MalformedURLException mue) { } if (url != null) { result = FileUtil.getFileFromURL(url); } else { result = new File(location); } CheckUtils.checkSetting(result != null && result.exists(), "Can't read file \"%s\"; invalid class path", location); return result; } }