/**************************************************************************
OmegaT - Computer Assisted Translation (CAT) tool
with fuzzy matching, translation memory, keyword search,
glossaries, and translation leveraging into updated projects.
Copyright (C) 2000-2006 Keith Godfrey and Maxym Mykhalchuk
2009 Didier Briel, Guido Leenders
2015 Tony Graham
Home page: http://www.omegat.org/
Support center: http://groups.yahoo.com/group/OmegaT/
This file is part of OmegaT.
OmegaT 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.
OmegaT 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/>.
**************************************************************************/
package org.omegat.filters3.xml.relaxng;
import java.io.BufferedReader;
import org.omegat.filters2.Instance;
import org.omegat.filters3.xml.XMLDialect;
import org.omegat.filters3.xml.XMLFilter;
import org.omegat.util.OConsts;
import org.omegat.util.OStrings;
/**
* Filter for RELAX NG XML files.
*
* RELAX NG is a schema language for XML. See http://relaxng.org/
*
* @author Tony Graham
*/
public class RelaxNGFilter extends XMLFilter {
/**
* Creates a new instance of RelaxNG
*/
public RelaxNGFilter() {
super(new RelaxNGDialect());
}
/**
* Human-readable name of the File Format this filter supports.
*
* @return File format name
*/
public String getFileFormatName() {
return OStrings.getString("RELAXNG_FILTER_NAME");
}
/**
* The default list of filter instances that this filter class has. One
* filter class may have different filter instances, different by source
* file mask, encoding of the source file etc.
* <p>
* Note that the user may change the instances freely.
*
* @return Default filter instances
*/
public Instance[] getDefaultInstances() {
return new Instance[] { new Instance("*.rng", null, null), };
}
/**
* Either the encoding can be read, or it is UTF-8.
*
* @return <code>false</code>
*/
@Override
public boolean isSourceEncodingVariable() {
return false;
}
/**
* Yes, RELAX NG XML may be written out in a variety of encodings.
*
* @return <code>true</code>
*/
@Override
public boolean isTargetEncodingVariable() {
return true;
}
@Override
protected boolean requirePrevNextFields() {
return true;
}
/**
* Returns whether the file is supported by the filter by checking
* RELAX NG element and namespace constraints.
*
* @return <code>true</code> or <code>false</code>
*/
public boolean isFileSupported(BufferedReader reader) {
XMLDialect dialect = getDialect();
if (dialect.getConstraints() == null || dialect.getConstraints().isEmpty()) {
return true;
}
try {
char[] cbuf = new char[OConsts.READ_AHEAD_LIMIT];
int cbuf_len = reader.read(cbuf);
String buf = new String(cbuf, 0, cbuf_len);
return RelaxNGDialect.RELAXNG_ROOT_TAG.matcher(buf).find()
&& RelaxNGDialect.RELAXNG_XMLNS.matcher(buf).find();
} catch (Exception e) {
return false;
}
}
}