Add API for restricting operations for sensitive files

This change adds the following API:

* org.eclipse.core.resources.IFile.isContentRestricted()
* org.eclipse.core.resources.IFile.setContentRestricted(boolean)

The goal of this API is to allow Eclipse-based IDEs to restrict certain
platform functionality on a per-file basis, for sensitive files.

The flags are not persisted, to enable restricted handling
these flags must be set for each session.

The restrictions will apply to following functionality:

* File search
* Storing file history

Potentially more platform functionality will be restricted.

See: #2588

Author: trancexpress

resources/bundles/org.eclipse.core.resources/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.core.resources; singleton:=true
-Bundle-Version: 3.23.300.qualifier
+Bundle-Version: 3.24.0.qualifier
 Bundle-Activator: org.eclipse.core.resources.ResourcesPlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/File.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2015 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -61,6 +61,8 @@
  */
 public class File extends Resource implements IFile {
 
+	private volatile boolean isRestricted;
+
 	protected File(IPath path, Workspace container) {
 		super(path, container);
 	}
@@ -670,4 +672,13 @@ public String getLineSeparator(boolean checkParent) throws CoreException {
 		return checkParent ? getProject().getDefaultLineSeparator() : null;
 	}
 
+	@Override
+	public boolean isContentRestricted() {
+		return isRestricted;
+	}
+
+	@Override
+	public void setContentRestricted(boolean restricted) {
+		isRestricted = restricted;
+	}
 }

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/resources/IFile.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2000, 2015 IBM Corporation and others.
+ *  Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  *  This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License 2.0
@@ -1414,4 +1414,32 @@ public default String readString() throws CoreException {
 	public default String getLineSeparator(boolean checkParent) throws CoreException {
 		return getProject().getDefaultLineSeparator();
 	}
+
+	/**
+	 * Returns whether the current file is marked as containing restricted
+	 * (sensitive) content, where some IDE functionality related to the file content
+	 * might be limited.
+	 *
+	 * @return whether the current file is marked as containing sensitive content.
+	 *         This flag is not persisted and is {@code false} by default
+	 * @since 3.24
+	 */
+	default boolean isContentRestricted() {
+		return false;
+	}
+
+	/**
+	 * Marks the current file as containing restricted (sensitive) content. Some IDE
+	 * functionality related to the file content might be limited as long as the
+	 * file is marked as restricted. This flag is not persisted and is {@code false}
+	 * by default.
+	 *
+	 * @param restricted <code>true</code> if the file should be a marked
+	 *                   restricted, <code>false</code> if the file should be
+	 *                   unmarked
+	 * @since 3.24
+	 */
+	default void setContentRestricted(boolean restricted) {
+		throw new UnsupportedOperationException();
+	}
 }

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/resources/AllInternalResourcesTests.java

@@ -32,6 +32,7 @@
 		ResourceInfoTest.class, //
 		WorkspaceConcurrencyTest.class, //
 		WorkspacePreferencesTest.class, //
+		RestrictedFileTests.class, //
 })
 public class AllInternalResourcesTests {
 }

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/resources/RestrictedFileTests.java

@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Simeon Andreev and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Simeon Andreev - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.core.tests.internal.resources;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IWorkspace;
+import org.eclipse.core.resources.IWorkspaceRoot;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.tests.resources.util.WorkspaceResetExtension;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+@ExtendWith(WorkspaceResetExtension.class)
+public class RestrictedFileTests {
+
+	@Test
+	public void testRestrictedFile() throws Exception {
+		IWorkspace workspace = ResourcesPlugin.getWorkspace();
+		IWorkspaceRoot root = workspace.getRoot();
+		IProject project = root.getProject(RestrictedFileTests.class.getSimpleName());
+		try {
+			project.create(null);
+			project.open(null);
+
+			IFile file1 = project.getFile("test1.txt");
+			IFile file2 = project.getFile("test2.txt");
+
+			assertFalse(file1.isContentRestricted(), "Expected file to not be restricted");
+
+			file1.create("line 1".getBytes(), IResource.FORCE, null);
+			file2.create("line 1".getBytes(), IResource.FORCE, null);
+
+			assertFalse(file1.isContentRestricted(), "Expected file to not be restricted");
+			assertFalse(file2.isContentRestricted(), "Expected file to not be restricted");
+
+			file1.setContentRestricted(true);
+			assertTrue(file1.isContentRestricted(), "Expected file to be restricted");
+			assertFalse(file2.isContentRestricted(), "Expected file to not be restricted");
+		} finally {
+			project.delete(true, null);
+		}
+	}
+}