/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.search.extractors;
import org.opencms.xml.CmsXmlGenericWrapper;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import org.dom4j.Document;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
/**
* Extracts the text from OpenOffice documents (.ods, .odf).<p>
*
* @since 7.0.4
*/
public final class CmsExtractorOpenOffice extends A_CmsTextExtractor {
/** Static member instance of the extractor. */
private static final CmsExtractorOpenOffice INSTANCE = new CmsExtractorOpenOffice();
/**
* Hide the public constructor.<p>
*/
private CmsExtractorOpenOffice() {
// noop
}
/**
* Returns an instance of this text extractor.<p>
*
* @return an instance of this text extractor
*/
public static I_CmsTextExtractor getExtractor() {
return INSTANCE;
}
/**
* @see org.opencms.search.extractors.A_CmsTextExtractor#extractText(java.io.InputStream, java.lang.String)
*/
@Override
public I_CmsExtractionResult extractText(InputStream in, String encoding) throws Exception {
ZipInputStream zin = new ZipInputStream(in);
ZipEntry ze;
boolean FOUND_CONTENT = false;
String result = "";
while (!FOUND_CONTENT) {
ze = zin.getNextEntry();
FOUND_CONTENT = ze.getName().equalsIgnoreCase("content.xml");
if (FOUND_CONTENT) {
result = readContent(zin);
try {
zin.close();
} catch (Exception e) {
e.printStackTrace(System.err);
}
}
}
result = removeControlChars(result);
return new CmsExtractionResult(result);
}
/**
* Internal routine that parses the specific content.xml part of
* an odf document.<p>
*
* @param in the input stream spooled to the start of the content.xml part
*
* @return the extracted content
*
* @throws Exception if sth goes wrong
*/
private String readContent(java.io.InputStream in) throws Exception {
StringBuffer resultBuffer = new StringBuffer();
SAXReader reader = new SAXReader();
Document doc = reader.read(in);
List<Node> textlist = CmsXmlGenericWrapper.selectNodes(doc, "//text:p[@*] | //text:span[@*]");
Iterator<Node> li = textlist.iterator();
while (li.hasNext()) {
Node textNode = li.next();
String text = textNode.getText();
if (text.length() > 1) {
text = " " + text + " ";
resultBuffer.append(text);
}
}
return resultBuffer.toString();
}
}