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/*****************************************************************************
* Java Plug-in Framework (JPF)
* Copyright (C) 2004-2007 Dmitry Olshansky
*
* 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.
*
* 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.java.plugin.registry.xml;
import java.io.IOException;
import java.util.LinkedList;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
/**
*
* @version $Id$
*/
abstract class BaseHandler extends DefaultHandler {
protected final Log log = LogFactory.getLog(getClass());
protected final EntityResolver entityResolver;
BaseHandler(final EntityResolver anEntityResolver) {
entityResolver = anEntityResolver;
}
/**
* @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String,
* java.lang.String)
*/
@Override
public InputSource resolveEntity(final String publicId,
final String systemId) throws SAXException {
if (entityResolver != null) {
try {
return entityResolver.resolveEntity(publicId, systemId);
} catch (SAXException se) {
throw se;
} catch (IOException ioe) {
throw new SAXException("I/O error has occurred - " + ioe, ioe); //$NON-NLS-1$
}
}
log.warn("ignoring publicId=" + publicId //$NON-NLS-1$
+ " and systemId=" + systemId); //$NON-NLS-1$
return null;
}
/**
* @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
*/
@Override
public void warning(final SAXParseException e) {
log.warn("non-fatal error while parsing XML document", e); //$NON-NLS-1$
}
/**
* @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
*/
@Override
public void error(final SAXParseException e) throws SAXException {
if (entityResolver != null) {
// we are in "validating" mode
log.error("failed parsing XML resource in validating mode", e); //$NON-NLS-1$
throw e;
}
log.warn("ignoring parse error", e); //$NON-NLS-1$
}
/**
* @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
*/
@Override
public void fatalError(final SAXParseException e) throws SAXException {
log.fatal("failed parsing XML resource", e); //$NON-NLS-1$
throw e;
}
}
class SimpleStack<T> {
private LinkedList<T> data;
SimpleStack() {
data = new LinkedList<T>();
}
T pop() {
return data.isEmpty() ? null : data.removeLast();
}
void push(final T obj) {
data.addLast(obj);
}
int size() {
return data.size();
}
}
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