XmlConsolidateStreamChangeLog.java

package hudson.plugins.accurev;

import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.logging.Logger;

/**
 *
 */
public class XmlConsolidateStreamChangeLog {

    private static final Logger logger = Logger.getLogger(AccurevSCM.class.getName());
    private static final Map<Class<XMLOutputFactory>, XMLOutputFactory> OUTPUT_FACTORY_CACHE = new WeakHashMap<>(1);

    static XMLOutputFactory getFactory() {
        synchronized (OUTPUT_FACTORY_CACHE) {
            final XMLOutputFactory existingFactory = OUTPUT_FACTORY_CACHE.get(XMLOutputFactory.class);
            if (existingFactory != null) {
                return existingFactory;
            }
            XMLOutputFactory newFactory = XMLOutputFactory.newFactory();
            OUTPUT_FACTORY_CACHE.put(XMLOutputFactory.class, newFactory);
            return newFactory;
        }

    }

    public static File getStreamChangeLogFile(File changelogFile, AccurevStream stream) {
        File dir = changelogFile.getParentFile();
        return new File(dir, stream.getName() + "_" + changelogFile.getName());
    }

    public static File getUpdateChangeLogFile(File changelogFile) {
        File dir = changelogFile.getParentFile();
        return new File(dir, "update_" + changelogFile.getName());
    }

    public static void createChangeLog(List<String> streamFiles, File changeLogFile, String updateFile) throws IOException {
        try (FileOutputStream changeLogStream = new FileOutputStream(changeLogFile)) {
            XMLOutputFactory outputFactory = getFactory();
            XMLStreamWriter streamWriter = outputFactory.createXMLStreamWriter(changeLogStream);
            streamWriter.writeStartDocument();
            streamWriter.writeStartElement("ChangeLogs");
            if (updateFile != null) {
                streamWriter.writeStartElement("UpdateLog");
                streamWriter.writeCharacters(updateFile);
                streamWriter.writeEndElement();
            }
            for (String streamFile : streamFiles) {
                streamWriter.writeStartElement("ChangeLog");
                streamWriter.writeCharacters(streamFile);
                streamWriter.writeEndElement();
            }
            streamWriter.writeEndElement();
            streamWriter.writeEndDocument();
        } catch (FileNotFoundException | XMLStreamException ex) {
            AccurevLauncher.logException("Unable to create consolidated changelog " + XmlConsolidateStreamChangeLog.class.getSimpleName(), ex,
                logger, null);
        }

    }
}