Clean up new o.e.core.resources.undo.snapshot API to make it more usable

Signed-off-by: Rob Stryker <stryker@redhat.com>

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/undo/snapshot/AbstractResourceSnapshot.java

@@ -83,7 +83,7 @@ protected AbstractResourceSnapshot(T resource) {
 	@Override
 	public T createResource(IProgressMonitor monitor) throws CoreException {
 		T resource = createResourceHandle();
-		createExistentResourceFromHandle(resource, monitor);
+		createExistentResourceFromHandle(monitor);
 		restoreResourceAttributes(resource);
 		return resource;
 	}

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/undo/snapshot/ContainerSnapshot.java

@@ -19,9 +19,7 @@
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.List;
-
 import org.eclipse.core.resources.IContainer;
-import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IFolder;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IResourceFilterDescription;
@@ -183,20 +181,16 @@ protected final void createChildResources(IContainer parentHandle,
 	}
 
 	@Override
-	public void recordStateFromHistory(T resource, IProgressMonitor mon) throws CoreException {
+	public void recordStateFromHistory(IProgressMonitor mon) throws CoreException {
 		if (members != null) {
 			SubMonitor subMonitor = SubMonitor.convert(mon, ResourceSnapshotMessages.FolderDescription_SavingUndoInfoProgress,
 					members.size());
 			for (IResourceSnapshot<? extends IResource> member : members) {
 				SubMonitor iterationMonitor = subMonitor.split(1);
 				if (member instanceof FileSnapshot fileSnapshot) {
-					IPath path = resource.getFullPath().append(fileSnapshot.name);
-					IFile fileHandle = resource.getWorkspace().getRoot().getFile(path);
-					fileSnapshot.recordStateFromHistory(fileHandle, iterationMonitor);
+					fileSnapshot.recordStateFromHistory(iterationMonitor);
 				} else if (member instanceof FolderSnapshot folderSnapshot) {
-					IPath path = resource.getFullPath().append(folderSnapshot.name);
-					IFolder folderHandle = resource.getWorkspace().getRoot().getFolder(path);
-					folderSnapshot.recordStateFromHistory(folderHandle, iterationMonitor);
+					folderSnapshot.recordStateFromHistory(iterationMonitor);
 				}
 			}
 		}

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/undo/snapshot/FileSnapshot.java

@@ -94,8 +94,8 @@ public FileSnapshot(IFile file, URI linkLocation,
 	}
 
 	@Override
-	public void recordStateFromHistory(IFile resource,
-			IProgressMonitor monitor) throws CoreException {
+	public void recordStateFromHistory(IProgressMonitor monitor) throws CoreException {
+		IFile resource = createResourceHandle();
 		Assert.isLegal(resource.getType() == IResource.FILE);
 		if (location != null) {
 			// file is linked, no need to record any history
@@ -131,7 +131,8 @@ public IFile createResourceHandle() {
 	}
 
 	@Override
-	public void createExistentResourceFromHandle(IFile fileHandle, IProgressMonitor mon) throws CoreException {
+	public void createExistentResourceFromHandle(IProgressMonitor mon) throws CoreException {
+		IFile fileHandle = createResourceHandle();
 		if (fileHandle.exists()) {
 			return;
 		}

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/undo/snapshot/FolderSnapshot.java

@@ -16,7 +16,6 @@
 package org.eclipse.core.internal.resources.undo.snapshot;
 
 import java.net.URI;
-
 import org.eclipse.core.resources.IFolder;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IResourceFilterDescription;
@@ -74,7 +73,8 @@ public IFolder createResourceHandle() {
 	}
 
 	@Override
-	public void createExistentResourceFromHandle(final IFolder folderHandle, IProgressMonitor mon) throws CoreException {
+	public void createExistentResourceFromHandle(IProgressMonitor mon) throws CoreException {
+		IFolder folderHandle = createResourceHandle();
 		if (folderHandle.exists()) {
 			return;
 		}

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/undo/snapshot/ProjectSnapshot.java

@@ -78,7 +78,8 @@ public IProject createResourceHandle() {
 	}
 
 	@Override
-	public void createExistentResourceFromHandle(IProject projectHandle, IProgressMonitor monitor) throws CoreException {
+	public void createExistentResourceFromHandle(IProgressMonitor monitor) throws CoreException {
+		IProject projectHandle = createResourceHandle();
 		SubMonitor subMonitor = SubMonitor.convert(monitor, 200);
 		if (projectHandle.exists()) {
 			return;

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/resources/undo/snapshot/IResourceSnapshot.java

@@ -61,13 +61,11 @@ public interface IResourceSnapshot<T extends IResource> {
 	 * Given a resource handle, create an actual resource with the attributes of
 	 * the receiver resource description.
 	 *
-	 * @param resource
-	 *            the resource handle
 	 * @param monitor
 	 *            the progress monitor to be used when creating the resource
 	 * @throws CoreException if creation failed
 	 */
-	public void createExistentResourceFromHandle(T resource, IProgressMonitor monitor) throws CoreException;
+	public void createExistentResourceFromHandle(IProgressMonitor monitor) throws CoreException;
 
 	/**
 	 * Return a boolean indicating whether this resource description has enough
@@ -82,13 +80,11 @@ public interface IResourceSnapshot<T extends IResource> {
 	 * Record the appropriate state of this resource description using
 	 * any available resource history.
 	 *
-	 * @param resource
-	 *            the resource whose state is to be recorded.
 	 * @param monitor
 	 *            the progress monitor to be used
 	 * @throws CoreException in case of error
 	 */
-	public void recordStateFromHistory(T resource, IProgressMonitor monitor) throws CoreException;
+	public void recordStateFromHistory(IProgressMonitor monitor) throws CoreException;
 
 	/**
 	 * Return a boolean indicating whether this description represents an