Управление метками конфиденциальности в презентациях PowerPoint для Android

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Чтение, добавление, обновление, удаление и миграция меток конфиденциальности Microsoft Purview в презентациях PowerPoint PPTX с помощью Aspose.Slides для Android через Java.

Обзор

Microsoft Purview sensitivity labels help organizations classify and govern documents. During automated presentation processing, an application may need to preserve an existing label, apply a label selected by a policy, update its state, or migrate label metadata written by an older Microsoft Information Protection (MIP) workflow.

Aspose.Slides for Android via Java exposes modern sensitivity label metadata through IPresentation.getSensitivityLabels. This method returns an ISensitivityLabelCollection that can be inspected and modified before the presentation is saved as PPTX.

Note

Sensitivity label identifiers and policy information are defined by your Microsoft Purview configuration. Validate label availability and policy requirements in your environment before adding or migrating metadata. The ISensitivityLabel.getContentMarkTypes values describe the content markings associated with a label; they do not by themselves add visible text or shapes to slides.

Понимание свойств меток конфиденциальности

Each ISensitivityLabel contains the following metadata:

Методы	Назначение
ISensitivityLabel.getId and ISensitivityLabel.setId	Get or set the sensitivity label identifier in the Purview policy.
ISensitivityLabel.getSiteId and ISensitivityLabel.setSiteId	Get or set the site associated with the label policy.
ISensitivityLabel.isEnabled and ISensitivityLabel.setEnabled	Get or set whether the label is enabled.
ISensitivityLabel.isRemoved and ISensitivityLabel.setRemoved	Get or set whether the label has been removed. Set the value to `true` when the removal state must be retained in the metadata.
ISensitivityLabel.getAssignmentMethodType and ISensitivityLabel.setAssignmentMethodType	Get or set whether the label was applied automatically or through a user decision.
ISensitivityLabel.getContentMarkTypes	Get the content marking types associated with the label.

The SensitivityLabelAssignmentType class defines how a label was assigned:

SensitivityLabelAssignmentType.Standard represents a default or automatically applied label.
SensitivityLabelAssignmentType.Privileged represents a label applied through a user decision, including manually applied, recommended, and mandatory labels.

The SensitivityLabelContentType class defines the marking associated with a label:

Значение	Описание
SensitivityLabelContentType.None	The label was applied by default or automatically.
SensitivityLabelContentType.Header	Header content marking is associated with the label.
SensitivityLabelContentType.Footer	Footer content marking is associated with the label.
SensitivityLabelContentType.Watermark	Watermark content marking is associated with the label.
SensitivityLabelContentType.Encryption	Encryption protection is associated with the label.

Multiple marking types can be associated with one label.

Список существующих меток конфиденциальности

Read the modern label collection from IPresentation.getSensitivityLabels and enumerate it. The following example lists every property and content marking stored for each label:

import com.aspose.slides.*;

Presentation presentation = new Presentation("presentation.pptx");
try {
    ISensitivityLabelCollection sensitivityLabels = presentation.getSensitivityLabels();

    for (ISensitivityLabel sensitivityLabel : sensitivityLabels) {
        System.out.println("Label ID: " + sensitivityLabel.getId());
        System.out.println("Site ID: " + sensitivityLabel.getSiteId());
        System.out.println("Enabled: " + sensitivityLabel.isEnabled());
        System.out.println("Removed: " + sensitivityLabel.isRemoved());
        System.out.println("Assignment method: " + sensitivityLabel.getAssignmentMethodType());

        for (Integer contentMarkType : sensitivityLabel.getContentMarkTypes()) {
            System.out.println("Content marking: " + contentMarkType);
        }
    }
} finally {
    presentation.dispose();
}

Добавление метки конфиденциальности с контентной маркировкой

Use ISensitivityLabelCollection.add with the label identifier, site identifier, enabled state, and assignment method. After the method returns the new ISensitivityLabel, add the required marking values through the list returned by ISensitivityLabel.getContentMarkTypes.

The following example adds a manually selected label associated with footer and watermark markings, and then saves the result as PPTX:

import com.aspose.slides.*;
import java.util.UUID;

Presentation presentation = new Presentation("presentation.pptx");
try {
    ISensitivityLabelCollection sensitivityLabels = presentation.getSensitivityLabels();

    String labelIdentifier = "{11111111-2222-3333-4444-555555555555}";
    UUID siteIdentifier = UUID.fromString("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee");
    boolean isEnabled = true;
    int assignmentMethod = SensitivityLabelAssignmentType.Privileged;

    ISensitivityLabel sensitivityLabel = sensitivityLabels.add(
            labelIdentifier,
            siteIdentifier,
            isEnabled,
            assignmentMethod);

    sensitivityLabel.getContentMarkTypes().addItem(SensitivityLabelContentType.Footer);
    sensitivityLabel.getContentMarkTypes().addItem(SensitivityLabelContentType.Watermark);

    presentation.save("presentation_with_label.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Обновление метки конфиденциальности

The ISensitivityLabel values are read/write, except that the list returned by ISensitivityLabel.getContentMarkTypes is modified through its list operations. After locating the required label, you can update its identifier, site identifier, enabled state, assignment method, removal state, and content marking types. Save the presentation to persist the changes.

The following example updates the enabled state and assignment method of the first label:

import com.aspose.slides.*;

Presentation presentation = new Presentation("presentation.pptx");
try {
    ISensitivityLabelCollection sensitivityLabels = presentation.getSensitivityLabels();

    if (sensitivityLabels.getCount() > 0) {
        ISensitivityLabel sensitivityLabel = sensitivityLabels.get_Item(0);
        sensitivityLabel.setEnabled(true);
        sensitivityLabel.setAssignmentMethodType(SensitivityLabelAssignmentType.Privileged);
    }

    presentation.save("presentation_with_updated_label.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Отметить метку конфиденциальности как удалённую

To preserve the fact that a label was removed, find the label and call ISensitivityLabel.setRemoved with true. This retains the label entry while recording its removed state. If you instead need to delete an entry from the modern collection, use ISensitivityLabelCollection.removeAt; use ISensitivityLabelCollection.clear to delete every entry.

The following example marks a specific label as removed and saves the updated presentation:

import com.aspose.slides.*;

Presentation presentation = new Presentation("presentation.pptx");
try {
    ISensitivityLabelCollection sensitivityLabels = presentation.getSensitivityLabels();
    String targetLabelIdentifier = "{11111111-2222-3333-4444-555555555555}";

    for (ISensitivityLabel sensitivityLabel : sensitivityLabels) {
        boolean isTargetLabel = sensitivityLabel.getId().equalsIgnoreCase(targetLabelIdentifier);

        if (isTargetLabel) {
            sensitivityLabel.setRemoved(true);
            break;
        }
    }

    presentation.save("presentation_with_removed_label.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Чтение и миграция устаревших меток конфиденциальности MIP

Older MIP-based workflows can store sensitivity label metadata in custom document properties instead of the modern label collection. Read that metadata with IDocumentProperties.getSensitivityLabels. The method parses the legacy custom properties and returns an array of ISensitivityLabel objects.

To migrate the metadata, add each returned label to the modern ISensitivityLabelCollection through ISensitivityLabelCollection.add. Because adding a duplicate label identifier raises an exception, the example checks the destination collection before copying each label. You can add further validation to confirm that each legacy label still exists in the current Purview policy.

import com.aspose.slides.*;

Presentation presentation = new Presentation("presentation_with_legacy_labels.pptx");
try {
    ISensitivityLabel[] legacySensitivityLabels = presentation.getDocumentProperties().getSensitivityLabels();
    ISensitivityLabelCollection modernSensitivityLabels = presentation.getSensitivityLabels();

    for (ISensitivityLabel legacySensitivityLabel : legacySensitivityLabels) {
        boolean labelAlreadyExists = false;

        for (ISensitivityLabel modernSensitivityLabel : modernSensitivityLabels) {
            labelAlreadyExists = modernSensitivityLabel.getId().equalsIgnoreCase(
                    legacySensitivityLabel.getId());

            if (labelAlreadyExists) {
                break;
            }
        }

        if (!labelAlreadyExists) {
            modernSensitivityLabels.add(legacySensitivityLabel);
        }
    }

    presentation.save("presentation_with_modern_labels.pptx", SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

The migration copies the parsed label objects into the modern collection. It does not require clearing all custom document properties, so unrelated document metadata remains intact. Use IPresentation.save with SaveFormat.Pptx to write the modern label metadata to a PPTX file.

Вопросы и ответы

Создаёт ли добавление типа контентной маркировки видимый заголовок, нижний колонтитул или водяной знак на слайдах?

No. Values added through the list returned by ISensitivityLabel.getContentMarkTypes describe the markings associated with the sensitivity label. They do not create visible text or shapes in the presentation. Add the corresponding slide content separately if your workflow must render those markings.

В чём разница между пометкой метки как удалённой и её удалением из коллекции?

Calling ISensitivityLabel.setRemoved with true keeps the label entry and records its removed state. Calling ISensitivityLabelCollection.removeAt deletes the entry from the modern collection. Choose the operation that matches your organization’s metadata retention requirements.

Может ли презентация содержать как устаревшие метаданные MIP, так и современные метки конфиденциальности?

Yes. Legacy labels can remain in custom document properties while modern labels are available through IPresentation.getSensitivityLabels. Use IDocumentProperties.getSensitivityLabels to read the legacy metadata and migrate only the valid labels that are not already present in the modern collection.

Что происходит, если метка с тем же идентификатором добавляется более одного раза?

ISensitivityLabelCollection.add raises an exception when the collection already contains a label with the same identifier. Check existing values returned by ISensitivityLabel.getId before adding or migrating labels.

Какой формат вывода следует использовать, чтобы сохранить обновлённые метки конфиденциальности?

Save the presentation as PPTX by calling IPresentation.save with SaveFormat.Pptx, as shown in the examples above.

Добавление водяных знаков в презентации на Android