com.groupdocs.search.common

Provides methods for extracting fields from a document.

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• Custom text extractors

The example demonstrates how to implement the interface.

 public class LogExtractor implements IFieldExtractor
 {
     private final String[] extensions = new String[] { ".log" };
     public final String[] getExtensions() { return extensions; }
     public final DocumentField[] getFields(String filePath)
     {
         File file = new File(filePath);
         DocumentField[] fields = new DocumentField[]
         {
             new DocumentField("FileName", file.getAbsolutePath()),
             new DocumentField("Content", extractContent(filePath)),
         };
         return fields;
     }
     private String extractContent(String filePath)
     {
         StringBuilder result = new StringBuilder();
         try {
             List<String> lines = Files.readAllLines(Paths.get(filePath), StandardCharsets.UTF_8);
             for (int i = 0; i < lines.size(); i++)
             {
                 String line = lines.get(i);
                 String processedLine = line.substring(12);
                 result.append(processedLine);
             }
         } catch (IOException ex) {
             throw new RuntimeException(ex);
         }
         return result.toString();
     }
 }
 

The example demonstrates how to use the custorm extractor for indexing.

 String indexFolder = "c:\\MyIndex\\"; // Specify path to the index folder
 String documentsFolder = "c:\\MyDocuments\\"; // Specify path to a folder containing documents to search
 Index index = new Index(indexFolder); // Creating or loading an index
 index.getIndexSettings().getCustomExtractors().addItem(new LogExtractor()); // Adding custom text extractor to index settings
 index.add(documentsFolder); // Indexing documents from the specified folder