org.jbpm.xes.XESLogMarshaller Maven / Gradle / Ivy

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/*
 * Copyright 2019 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.jbpm.xes;

import java.io.ByteArrayOutputStream;
import java.io.StringReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.jbpm.xes.model.LogType;
import org.jbpm.xes.model.ObjectFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class XESLogMarshaller {

    private static final Logger LOGGER = LoggerFactory.getLogger(XESLogMarshaller.class);

    private JAXBContext context;

    public XESLogMarshaller() {
        try {
            context = JAXBContext.newInstance("org.jbpm.xes.model");
        } catch (JAXBException ex) {
            LOGGER.error("Error trying to create XES marshaller: {}",
                         ex.getMessage(),
                         ex);
            throw new RuntimeException(ex);
        }
    }

    public String marshall(LogType log) throws Exception {
        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
                      Boolean.TRUE);

        final ByteArrayOutputStream stream = new ByteArrayOutputStream();
        final ObjectFactory factory = new ObjectFactory();

        m.marshal(factory.createLog(log),
                  stream);

        String xml = stream.toString();
        LOGGER.debug("\n" + xml);
        return xml;
    }

    public LogType unmarshall(String xml) throws Exception {
        Unmarshaller unmarshaller = context.createUnmarshaller();
        JAXBElement log = (JAXBElement) unmarshaller.unmarshal(new StringReader(xml));
        return log.getValue();
    }
}