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