Java tutorial
/* ************************************************************************ ******************* CANADIAN ASTRONOMY DATA CENTRE ******************* ************** CENTRE CANADIEN DE DONNES ASTRONOMIQUES ************** * * (c) 2018. (c) 2018. * Government of Canada Gouvernement du Canada * National Research Council Conseil national de recherches * Ottawa, Canada, K1A 0R6 Ottawa, Canada, K1A 0R6 * All rights reserved Tous droits rservs * * NRC disclaims any warranties, Le CNRC dnie toute garantie * expressed, implied, or nonce, implicite ou lgale, * statutory, of any kind with de quelque nature que ce * respect to the software, soit, concernant le logiciel, * including without limitation y compris sans restriction * any warranty of merchantability toute garantie de valeur * or fitness for a particular marchande ou de pertinence * purpose. NRC shall not be pour un usage particulier. * liable in any event for any Le CNRC ne pourra en aucun cas * damages, whether direct or tre tenu responsable de tout * indirect, special or general, dommage, direct ou indirect, * consequential or incidental, particulier ou gnral, * arising from the use of the accessoire ou fortuit, rsultant * software. Neither the name de l'utilisation du logiciel. Ni * of the National Research le nom du Conseil National de * Council of Canada nor the Recherches du Canada ni les noms * names of its contributors may de ses participants ne peuvent * be used to endorse or promote tre utiliss pour approuver ou * products derived from this promouvoir les produits drivs * software without specific prior de ce logiciel sans autorisation * written permission. pralable et particulire * par crit. * * This file is part of the Ce fichier fait partie du projet * OpenCADC project. OpenCADC. * * OpenCADC is free software: OpenCADC est un logiciel libre ; * you can redistribute it and/or vous pouvez le redistribuer ou le * modify it under the terms of modifier suivant les termes de * the GNU Affero General Public la GNU Affero General Public * License as published by the License? telle que publie * Free Software Foundation, par la Free Software Foundation * either version 3 of the : soit la version 3 de cette * License, or (at your option) licence, soit ( votre gr) * any later version. toute version ultrieure. * * OpenCADC is distributed in the OpenCADC est distribu * hope that it will be useful, dans lespoir quil vous * but WITHOUT ANY WARRANTY; sera utile, mais SANS AUCUNE * without even the implied GARANTIE : sans mme la garantie * warranty of MERCHANTABILITY implicite de COMMERCIALISABILIT * or FITNESS FOR A PARTICULAR ni dADQUATION UN OBJECTIF * PURPOSE. See the GNU Affero PARTICULIER. Consultez la Licence * General Public License for Gnrale Publique GNU Affero * more details. pour plus de dtails. * * You should have received Vous devriez avoir reu une * a copy of the GNU Affero copie de la Licence Gnrale * General Public License along Publique GNU Affero avec * with OpenCADC. If not, see OpenCADC ; si ce nest * <http://www.gnu.org/licenses/>. pas le cas, consultez : * <http://www.gnu.org/licenses/>. * ************************************************************************ */ package ca.nrc.cadc.caom2.xml; import ca.nrc.cadc.caom2.Artifact; import ca.nrc.cadc.caom2.ProductType; import ca.nrc.cadc.caom2.ReleaseType; import ca.nrc.cadc.caom2.access.ArtifactAccess; import ca.nrc.cadc.xml.XmlUtil; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.io.StringReader; import java.net.URI; import java.util.List; import org.apache.log4j.Logger; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.JDOMException; /** * * @author pdowler */ public class ArtifactAccessReader { private static final Logger log = Logger.getLogger(ArtifactAccessReader.class); static enum ENAMES { artifactAccess(), artifact(), uri(), productType(), releaseType(), contentLength(), contentType(), contentChecksum(), isPublic(), readGroups(); } public ArtifactAccessReader() { } public ArtifactAccess read(String xml) throws IOException { return read(new StringReader(xml)); } public ArtifactAccess read(InputStream istream) throws IOException { return read(new InputStreamReader(istream)); } public ArtifactAccess read(Reader reader) throws IOException { if (reader == null) { throw new IllegalArgumentException("reader must not be null"); } Document document; try { document = XmlUtil.buildDocument(reader); } catch (JDOMException ex) { throw new IllegalArgumentException("invalid input document", ex); } // Root element and namespace of the Document Element root = document.getRootElement(); if (!ENAMES.artifactAccess.name().equals(root.getName())) { throw new IllegalArgumentException( "invalid root element: " + root.getName() + " expected: " + ENAMES.artifactAccess); } Artifact a = getArtifact(root.getChild(ENAMES.artifact.name())); ArtifactAccess ret = new ArtifactAccess(a); ret.isPublic = getBoolean(root.getChildTextTrim(ENAMES.isPublic.name())); getGroupList(ret.getReadGroups(), ENAMES.readGroups.name(), root.getChildren(ENAMES.readGroups.name())); return ret; } private boolean getBoolean(String s) { if ("true".equals(s)) { return true; } return false; } private URI getURI(String s, boolean required) { if (!required && s == null) { return null; } try { return new URI(s); } catch (Exception ex) { throw new IllegalArgumentException("missing/invalid uri element: " + s + " expected: valid URI"); } } private Long getLong(String s) { if (s == null) { return null; } try { return Long.parseLong(s); } catch (Exception ex) { throw new IllegalArgumentException("invalid numeric element: " + s + " expected: valid long"); } } private Artifact getArtifact(Element ae) { URI uri = getURI(ae.getChildTextTrim(ENAMES.uri.name()), true); ProductType pt = ProductType.toValue(ae.getChildTextTrim(ENAMES.productType.name())); ReleaseType rt = ReleaseType.toValue(ae.getChildTextTrim(ENAMES.releaseType.name())); Artifact ret = new Artifact(uri, pt, rt); ret.contentChecksum = getURI(ae.getChildTextTrim(ENAMES.contentChecksum.name()), false); ret.contentLength = getLong(ae.getChildTextTrim(ENAMES.contentLength.name())); ret.contentType = ae.getChildTextTrim(ENAMES.contentType.name()); return ret; } private void getGroupList(List<URI> fill, String ename, List<Element> elements) { if (elements == null || elements.isEmpty()) { return; } if (elements.size() > 1) { throw new IllegalArgumentException( "invalid input document: found multiple " + ename + " expected: 0 or 1"); } Element ge = elements.get(0); for (Element e : ge.getChildren()) { if (!ENAMES.uri.name().equals(e.getName())) { throw new IllegalArgumentException( "invalid child element in " + ename + ": " + e.getName() + " expected: uri"); } URI guri = getURI(e.getTextTrim(), true); fill.add(guri); } } }