Removing metadata Leave feedback
Not all metadata properties extracted from a file are marked with tags. Some file formats and metadata standards allow adding fully custom properties that can’t be properly tagged by the library since their purpose is not clearly defined in the appropriate format/standard specification. In such cases, you can use the name of the property to locate and remove it. The following example demonstrates some advanced usage scenarios of the GroupDocs.Metadata search engine allowing to remove metadata properties.
- Load a file to be modified
- Pass a search predicate to the removeProperties method.
- Check the number of properties that were actually removed
- Save the changes
advanced_usage.RemovingMetadata
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.removeProperties(new groupdocs.metadata.ContainsTagSpecification(groupdocs.metadata.Tags.getTime().getPrinted()));
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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