org.metawidget.inspector.composite.ValidatingCompositeInspector Maven / Gradle / Ivy
// Metawidget (licensed under LGPL)
//
// 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.metawidget.inspector.composite;
import java.io.InputStream;
import javax.xml.XMLConstants;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import org.metawidget.inspector.iface.Inspector;
import org.metawidget.inspector.iface.InspectorException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
/**
* CompositeInspector that validates the inspection result XMLs against the
* inspection-result-1.0.xsd schema.
*
* This is useful for debugging when developing your own Inspector, but it is less
* performant and not all environments (eg. Android) support schema validation. Android is
* particularly bad because its Dalvik preprocessor balks at unsupported classes even if they're
* wrapped in a ClassNotFoundException.
*
* @author Richard Kennard
*/
public class ValidatingCompositeInspector
extends CompositeInspector {
//
// Private members
//
private final Schema mSchema;
//
// Constructor
//
public ValidatingCompositeInspector( ValidatingCompositeInspectorConfig config ) {
super( config );
InputStream in = config.getSchema();
try {
mSchema = SchemaFactory.newInstance( XMLConstants.W3C_XML_SCHEMA_NS_URI ).newSchema( new StreamSource( in ) );
} catch ( SAXException e ) {
throw InspectorException.newException( e );
}
}
//
// Protected methods
//
@Override
protected Document runInspector( Inspector inspector, Object toInspect, String type, String... names )
throws Exception {
Document document = super.runInspector( inspector, toInspect, type, names );
if ( document != null ) {
mSchema.newValidator().validate( new DOMSource( document ) );
}
return document;
}
}