[PT-#150740880] File listener and project listeners mechanics

Refactor project finder into project manager

Update annotation index based on project changes

Missing comments

headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/BasicFileObserver.java

@@ -0,0 +1,69 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Pivotal, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.commons.util;
+
+/**
+ * Basic implementation of File Observer interface
+ * 
+ * @author Alex Boyko
+ *
+ */
+public class BasicFileObserver implements FileObserver {
+	
+	private ListenerList<FileListener> listeners = new ListenerList<>(); 
+
+	@Override
+	public void addListener(FileListener listener) {
+		listeners.add(listener);
+	}
+
+	@Override
+	public void removeListener(FileListener listener) {
+		listeners.remove(listener);
+	}
+	
+	public void notifyFileChanged(String uri) {
+		listeners.forEach(l -> {
+			try {
+				if (l.accept(uri)) {
+					l.changed(uri);
+				}
+			} catch (Throwable t) {
+				Log.log(t);
+			}
+		});
+	}
+	
+	public void notifyFileCreated(String uri) {
+		listeners.forEach(l -> {
+			try {
+				if (l.accept(uri)) {
+					l.created(uri);
+				}
+			} catch (Throwable t) {
+				Log.log(t);
+			}
+		});
+	}
+	
+	public void notifyFileDeleted(String uri) {
+		listeners.forEach(l -> {
+			try {
+				if (l.accept(uri)) {
+					l.deleted(uri);
+				}
+			} catch (Throwable t) {
+				Log.log(t);
+			}
+		});
+	}
+	
+}

headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/FileObserver.java

@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Pivotal, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.commons.util;
+
+/**
+ * Object able to add/remove {@link FileListener} objects and fire events via these listeners
+ * 
+ * @author Alex Boyko
+ *
+ */
+public interface FileObserver {
+	
+	public interface FileListener {
+		boolean accept(String uri);
+		void changed(String uri);
+		void deleted(String uri);
+		void created(String uri);
+	}
+	
+	void addListener(FileListener listener);
+	
+	void removeListener(FileListener listener);
+
+}