PresentationService.java

/**
 * Get more info at : www.jrebirth.org .
 * Copyright JRebirth.org © 2011-2013
 * Contact : sebastien.bordes@jrebirth.org
 *
 * 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.jrebirth.af.presentation.service;

import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

import org.jrebirth.af.core.service.DefaultService;
import org.jrebirth.af.presentation.resources.PrezParameters;
import org.jrebirth.presentation.model.Presentation;
import org.jrebirth.presentation.model.Slide;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The class <strong>PresentationService</strong>.
 *
 * @author Sébastien Bordes
 */
public final class PresentationService extends DefaultService {

    /** The class logger. */
    private static final Logger LOGGER = LoggerFactory.getLogger(PresentationService.class);

    /** The root configuration object. */
    private Presentation presentation;

    /**
     * {@inheritDoc}
     */
    @Override
    public void initService() {

        final String configName = PrezParameters.XML_FILE_LOCATION.get();

        try {
            final JAXBContext jaxbContext = JAXBContext.newInstance("org.jrebirth.presentation.model");
            final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

            final InputStreamReader in = new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(configName + ".xml"), StandardCharsets.UTF_8);
            final XMLStreamReader xsr = XMLInputFactory.newInstance().createXMLStreamReader(in);

            this.presentation = Presentation.class.cast(JAXBElement.class.cast(unmarshaller.unmarshal(xsr)).getValue());

            int index = 0;
            for (final Slide slide : this.presentation.getSlides().getSlide()) {
                slide.setPage(index);
                index++;
            }

        } catch (final JAXBException | XMLStreamException | FactoryConfigurationError e) {
            LOGGER.error("Impossible to open {}.xml", configName, e);
        }
    }

    /**
     * @return Returns the presentation.
     */
    public Presentation getPresentation() {
        return this.presentation;
    }
}