[performance] IFile.create: reduce 1 of 3 store.fetchInfo()

Assume the file does not exist (normal case) - otherwise implementation
fails later during actual write.

#1443

Author: EcljpseB0T

resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/localstore/FileSystemResourceManager.java

@@ -23,6 +23,7 @@
 import java.io.BufferedInputStream;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -1213,32 +1214,42 @@ public void write(IFile target, InputStream content, IFileInfo fileInfo, int upd
 			IFileStore store = getStore(target);
 			prepareWrite(target, fileInfo, updateFlags, append, targetResource, store);
 
-			// On Windows an attempt to open an output stream on a hidden file results in FileNotFoundException.
-			// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=194216
-			boolean restoreHiddenAttribute = false;
-			if (fileInfo.exists() && fileInfo.getAttribute(EFS.ATTRIBUTE_HIDDEN) && Platform.getOS().equals(Platform.OS_WIN32)) {
-				fileInfo.setAttribute(EFS.ATTRIBUTE_HIDDEN, false);
-				store.putInfo(fileInfo, EFS.SET_ATTRIBUTES, subMonitor.split(1));
-				restoreHiddenAttribute = true;
-			} else {
-				subMonitor.split(1);
-			}
 			int options = append ? EFS.APPEND : EFS.NONE;
-			try (OutputStream out = store.openOutputStream(options, subMonitor.split(1))) {
-				if (restoreHiddenAttribute) {
-					fileInfo.setAttribute(EFS.ATTRIBUTE_HIDDEN, true);
+			try {
+				boolean opened = false;
+				try (OutputStream out = store.openOutputStream(options, subMonitor.split(1))) {
+					opened = true;
+					FileUtil.transferStreams(content, out, store.toString(), subMonitor.split(1));
+				} catch (CoreException e) {
+					// On Windows an attempt to open an output stream on a hidden file results in
+					// FileNotFoundException.
+					// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=194216
+					if (opened || !(e.getCause() instanceof FileNotFoundException)
+							|| !Platform.getOS().equals(Platform.OS_WIN32)) {
+						throw e;
+					}
+					fileInfo = store.fetchInfo();
+					if (!(fileInfo.exists() && fileInfo.getAttribute(EFS.ATTRIBUTE_HIDDEN))) {
+						throw e;
+					}
+					// set hidden=false and retry:
+					fileInfo.setAttribute(EFS.ATTRIBUTE_HIDDEN, false);
 					store.putInfo(fileInfo, EFS.SET_ATTRIBUTES, subMonitor.split(1));
-				} else {
-					subMonitor.split(1);
+					try (OutputStream out = store.openOutputStream(options, null)) {
+						// restore Hidden Attribute:
+						fileInfo.setAttribute(EFS.ATTRIBUTE_HIDDEN, true);
+						store.putInfo(fileInfo, EFS.SET_ATTRIBUTES, subMonitor.split(1));
+						FileUtil.transferStreams(content, out, store.toString(), subMonitor.split(1));
+					}
 				}
-				FileUtil.transferStreams(content, out, store.toString(), subMonitor.split(1));
 			} catch (IOException e) {
+				// Exception on OutputStream.close()
 				String msg = NLS.bind(Messages.localstore_couldNotWrite, store.toString());
 				throw new ResourceException(IResourceStatus.FAILED_WRITE_LOCAL, IPath.fromOSString(store.toString()), msg, e);
 			}
 			finishWrite(targetResource, store);
 		} catch (IOException streamCloseIgnored) {
-			// ignore;
+			// ignore Exception on InputStream.close()
 		}
 	}
 

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

@@ -24,6 +24,7 @@
 import org.eclipse.core.filesystem.EFS;
 import org.eclipse.core.filesystem.IFileInfo;
 import org.eclipse.core.filesystem.IFileStore;
+import org.eclipse.core.filesystem.provider.FileInfo;
 import org.eclipse.core.internal.preferences.EclipsePreferences;
 import org.eclipse.core.internal.utils.BitMask;
 import org.eclipse.core.internal.utils.Messages;
@@ -213,23 +214,13 @@ private void checkCreatable() throws CoreException {
 	private IFileInfo create(int updateFlags, SubMonitor subMonitor, IFileStore store)
 			throws CoreException, ResourceException {
 		String message;
-		IFileInfo localInfo = store.fetchInfo();
+		IFileInfo localInfo;
 		if (BitMask.isSet(updateFlags, IResource.FORCE)) {
-			if (!Workspace.caseSensitive) {
-				if (localInfo.exists()) {
-					String name = getLocalManager().getLocalName(store);
-					if (name == null || localInfo.getName().equals(name)) {
-						delete(true, null);
-					} else {
-						// The file system is not case sensitive and there is already a file
-						// under this location.
-						message = NLS.bind(Messages.resources_existsLocalDifferentCase,
-								IPath.fromOSString(store.toString()).removeLastSegments(1).append(name).toOSString());
-						throw new ResourceException(IResourceStatus.CASE_VARIANT_EXISTS, getFullPath(), message, null);
-					}
-				}
-			}
+			// Assume  the file does not exist - otherwise implementation fails later
+			// during actual write
+			localInfo = new FileInfo(getName()); // with exists==false
 		} else {
+			localInfo=store.fetchInfo();
 			if (localInfo.exists()) {
 				// return an appropriate error message for case variant collisions
 				if (!Workspace.caseSensitive) {