/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.riot.lang.rdfxml.rrx_stax_ev;

import java.io.InputStream;
import java.io.Reader;

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;

import org.apache.jena.atlas.web.ContentType;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.ReaderRIOT;
import org.apache.jena.riot.ReaderRIOTFactory;
import org.apache.jena.riot.RiotException;
import org.apache.jena.riot.lang.rdfxml.SysRRX;
import org.apache.jena.riot.system.ParserProfile;
import org.apache.jena.riot.system.StreamRDF;
import org.apache.jena.sparql.util.Context;

/**
 * RDF/XML parser.
 * <p>
 * This implementation uses StAX events via {@link XMLEventReader}.
 *
 * @see <a href="https://www.w3.org/TR/rdf-xml/">https://www.w3.org/TR/rdf-xml/</a>
 */
public class ReaderRDFXML_StAX_EV implements ReaderRIOT
{
    public static ReaderRIOTFactory factory = (Lang language, ParserProfile parserProfile) -> {
        return new ReaderRDFXML_StAX_EV(parserProfile);
    };

    private static final XMLInputFactory xmlInputFactory = SysRRX.createXMLInputFactory();
    private final ParserProfile parserProfile;

    public static boolean TRACE = false;

    public ReaderRDFXML_StAX_EV(ParserProfile parserProfile) {
        this.parserProfile = parserProfile;
    }

    @Override
    public void read(InputStream input, String baseURI, ContentType ct, StreamRDF output, Context context) {
        try {
            XMLEventReader xmlEventReader = xmlInputFactory.createXMLEventReader(input);
            parse(xmlEventReader, baseURI, ct, output, context);
        } catch (XMLStreamException ex) {
            throw new RiotException("Failed to create the XMLEventReader", ex);
        }
    }

    @Override
    public void read(Reader reader, String baseURI, ContentType ct, StreamRDF output, Context context) {
        try {
            XMLEventReader xmlEventReader = xmlInputFactory.createXMLEventReader(reader);
            parse(xmlEventReader, baseURI, ct, output, context);
        } catch (XMLStreamException ex) {
            throw new RiotException("Failed to create the XMLEventReader", ex);
        }
    }

    private void parse(XMLEventReader xmlEventReader, String xmlBase, ContentType ct, StreamRDF destination, Context context) {
        ParserRDFXML_StAX_EV parser = new ParserRDFXML_StAX_EV(xmlEventReader, xmlBase, parserProfile, destination, context);
        destination.start();
        try {
            parser.parse();
        } catch (RiotException ex) {
            throw ex;
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RiotException(ex);
        } finally { destination.finish(); }
    }
}
