Updating metadata Leave feedback
The example below demonstrates how to update existing metadata properties using a combination of criteria. Please note that the updateProperties method checks the type of all properties before applying any changes. If a property satisfies the predicate but has a type different from the passed value it won’t be updated. The explicit type check in the example is performed since we use the existing value to filter metadata properties.
- Open a file to be updated
- Specify a predicate that will be used to filter desired metadata properties
- Specify a value which you want to be assigned to the selected properties
- Pass the predicate and the new value to the updateProperties method
- Check the actual number of updated properties
- Save the changes
advanced_usage.UpdatingMetadata
fs.readdirSync(Constants.inputPath).forEach(file => {
var metadata = new groupdocs.metadata.Metadata(Constants.inputPath + file);
if (metadata.getFileFormat() != groupdocs.metadata.FileFormat.Unknown && !metadata.getDocumentInfo().isEncrypted()) {
console.log(file);
// Add a property containing the file last printing date if it's missing
// Note that the property will be added to metadata packages that satisfy the following criteria:
// 1) Only existing metadata packages will be affected. No new packages are added during this operation
// 2) There should be a known metadata property in the package structure that fits the search condition but is actually missing in the package.
// All properties supported by a certain package are usually defined in the specification of a particular metadata standard
var affected = metadata.updateProperties(new groupdocs.metadata.ContainsTagSpecification(groupdocs.metadata.Tags.getTime().getPrinted()), new groupdocs.metadata.PropertyValue(new Date()));
console.log(`Affected properties: ${affected}`);
}
});
To learn more about library features and get familiar how to manage metadata and more, please refer to theadvanced usage section.
You may easily run the code above and see the feature in action in our GitHub examples:
Along with a full featured Java library we provide simple, but powerful free Apps.
You are welcome to view and edit metadata of PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, emails, images and more with our free online Free Online Document Metadata Viewing and Editing App.
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