// For complete examples and data files, please go to https://github.com/groupdocs-assembly/GroupDocs.Assembly-for-Java
String srcDocument = "/Email Templates/Bubble Chart.eml";
String docReport = "/Email Reports/Bubble Chart_report.eml";
Object[] getDataSourceDetails = DataStorage.emailDataSourceObject("Bubble Chart.eml", ".eml");
String[] dataSourceNames = DataStorage.emailDataSourceName(".eml");
DocumentAssembler assembler = new DocumentAssembler();
assembler.assembleDocument(CommonUtilities.getDataPath(srcDocument),
CommonUtilities.getOutPath(docReport), getDataSourceDetails,
dataSourceNames);