package com.atlassian.dbexporter;
   
   import com.atlassian.activeobjects.spi.ImportExportException;
   import com.atlassian.dbexporter.exporter.ExportConfiguration;
   import com.atlassian.dbexporter.exporter.Exporter;
   import com.atlassian.dbexporter.node.NodeCreator;
   import com.atlassian.dbexporter.node.NodeStreamWriter;
   import com.atlassian.dbexporter.progress.ProgressMonitor;
   
  import java.util.List;
  
  import static com.atlassian.dbexporter.node.NodeBackup.RootNode;
  import static com.google.common.base.Preconditions.checkArgument;
  import static com.google.common.base.Preconditions.checkNotNull;
  import static com.google.common.collect.Lists.newArrayList;
  
  /**
   * Creates an export of a database. What exactly the export 'looks' like depends heavily on the exporters passed-in.
   * <p>
   * A {@link ProgressMonitor} can be supplied to be notified of the progress as the export is being made.
   *
   * @author Erik van Zijst
   * @author Samuel Le Berrigaud
   */
  public final class DbExporter {
      private final List<Exporter> exporters;
  
      public DbExporter(final Exporter... exporters) {
          this(newArrayList(checkNotNull(exporters)));
      }
  
      public DbExporter(final List<Exporter> exporters) {
          checkArgument(!checkNotNull(exporters).isEmpty(), "DbExporter must be created with at least one Exporter!");
          this.exporters = exporters;
      }
  
      /**
       * Imports the XML document read from the stream
       *
       * @param streamWriter  the stream to write the XML to
       * @param configuration the export configuration
       * @throws ImportExportException or one of its sub-types if an unexpected exception happens during the import.
       */
      public void exportData(NodeStreamWriter streamWriter, ExportConfiguration configuration) {
          final ProgressMonitor monitor = configuration.getProgressMonitor();
          monitor.begin();
  
          final NodeCreator node = RootNode.add(streamWriter);
          final Context context = new Context();
          for (Exporter exporter : exporters) {
              exporter.export(node, configuration, context);
          }
  
          monitor.end();
      }
  }