Extract highlights

GroupDocs.Parser provides the functionality to extract a highlight (a part of the text which is usually used to explain the context of the found text in the search functionality) from documents by the getHighlight(int, boolean, HighlightOptions) method:

HighlightItem getHighlight(int position, boolean isDirect, HighlightOptions options);

The position parameter defines the start position from which the highlight is extracted. The isDirect parameter indicates whether highlight extraction is direct: true if the highlight is extracted by the right of the position; otherwise, false. HighlightOptions parameter is used to define the end of the highlight.

HighlightOptions class has the following constructors:

// Highlight is limited to maxLength text length.
HighlightOptions(int maxLength);
// Highlight is limited to the start (or the end) of a text line (or maxLength text length - if set).
HighlightOptions(Integer maxLength, boolean isLineLimited);
// Highlight is limited to word count (or maxLength text length - if set).
HighlightOptions(Integer maxLength, int wordCount);
// General constructor
HighlightOptions(Integer maxLength, Integer wordCount, boolean isLineLimited);

HighlightItem class has the following members:

getPositionThe position in the document text.
getTextThe highlight text.

Here are the steps to extract highlight from the document:

The following example shows how to extract a highlight that contains 3 words:

// Create an instance of Parser class
try (Parser parser = new Parser(Constants.SamplePdf)) {
    // Extract a highlight:
    HighlightItem hl = parser.getHighlight(2, true, new HighlightOptions(3));
    // Check if highlight extraction is supported
    if (hl == null) {
        System.out.println("Highlight extraction isn't supported");
    // Print an extracted highlight
    System.out.println(String.format("At %d: %s", hl.getPosition(), hl.getText()));

More resources

GitHub examples

You may easily run the code above and see the feature in action in our GitHub examples:

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