001 /**
002 *
003 * $Revision: 13085 $ $Date: 2008-02-06 18:27:24 +0100 (Mi, 06 Feb 2008) $
004 *
005 * This file is part of ** M y C o R e **
006 * Visit our homepage at http://www.mycore.de/ for details.
007 *
008 * This program is free software; you can use it, redistribute it
009 * and / or modify it under the terms of the GNU General Public License
010 * (GPL) as published by the Free Software Foundation; either version 2
011 * of the License or (at your option) any later version.
012 *
013 * This program is distributed in the hope that it will be useful, but
014 * WITHOUT ANY WARRANTY; without even the implied warranty of
015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016 * GNU General Public License for more details.
017 *
018 * You should have received a copy of the GNU General Public License
019 * along with this program, normally in the file license.txt.
020 * If not, write to the Free Software Foundation Inc.,
021 * 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA
022 *
023 **/
024 package org.mycore.backend.hibernate.types;
025
026 import java.io.ByteArrayOutputStream;
027 import java.sql.Blob;
028
029 import org.dom4j.DocumentFactory;
030 import org.dom4j.Element;
031 import org.dom4j.Node;
032 import org.dom4j.io.OutputFormat;
033 import org.dom4j.io.SAXReader;
034 import org.dom4j.io.XMLWriter;
035 import org.hibernate.engine.Mapping;
036 import org.hibernate.engine.SessionFactoryImplementor;
037 import org.hibernate.lob.BlobImpl;
038 import org.hibernate.type.BlobType;
039
040 import org.mycore.common.MCRException;
041
042 public class MCRXMLBlobType extends BlobType {
043
044 private static final long serialVersionUID = -5081036473140936467L;
045
046 private static final DocumentFactory DOC_FACTORY = new DocumentFactory();
047
048 @Override
049 public Object fromXMLNode(Node xml, Mapping factory) {
050 if (xml.getNodeType() != Node.ELEMENT_NODE) {
051 throw new UnsupportedOperationException("Blobs can only be read from elements: " + xml.getNodeTypeName());
052 }
053 Element e = (Element) xml;
054 OutputFormat format = OutputFormat.createCompactFormat();
055 format.setTrimText(false);
056 format.setNewLineAfterDeclaration(true);
057 format.setSuppressDeclaration(false);
058 format.setEncoding("UTF-8");
059 ByteArrayOutputStream bout = new ByteArrayOutputStream();
060 try {
061 XMLWriter xmlWriter = new XMLWriter(bout, format);
062 xmlWriter.write(e.content());
063 } catch (Exception e1) {
064 throw new MCRException("Cannot write xml elements to Blob.", e1);
065 }
066 BlobImpl blob = new BlobImpl(bout.toByteArray());
067 return blob;
068 }
069
070 @Override
071 public void setToXMLNode(Node node, Object value, SessionFactoryImplementor factory) {
072 Blob blob = (Blob) value;
073 if (node.getNodeType() != Node.ELEMENT_NODE) {
074 throw new UnsupportedOperationException("Blobs can only be written to elements.");
075 }
076 Element e;
077 SAXReader xmlReader = new SAXReader(DOC_FACTORY);
078 xmlReader.setValidation(false);
079 try {
080 e = (Element) node;
081 e.appendContent(xmlReader.read(blob.getBinaryStream()));
082 } catch (Exception e1) {
083 throw new MCRException("Cannot build xml elements from Blob.", e1);
084 }
085 }
086
087 }