Create model interface representing file change (eclipse-che#6681)

* Replace abstract method with default implementation

Signed-off-by: Vladyslav Zhukovskyi <vzhukovs@redhat.com>

* Replace abstract method with default implementation

Signed-off-by: Vladyslav Zhukovskyi <vzhukovs@redhat.com>

* Fix formatting issue

Signed-off-by: Vladyslav Zhukovskyi <vzhukovs@redhat.com>

* Create model interface representing file change

Signed-off-by: Vladyslav Zhukovskyi <vzhukovs@redhat.com>

Author: vzhukovs

wsagent/che-core-api-project-shared/src/main/java/org/eclipse/che/api/project/shared/FileChange.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2012-2017 Red Hat, 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:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.api.project.shared;
+
+import org.eclipse.che.api.project.shared.dto.event.FileWatcherEventType;
+
+/**
+ * Entity which describes change occurred to the specific path.
+ *
+ * @author Vlad Zhukovskyi
+ * @since 5.19.0
+ */
+public interface FileChange {
+  String getPath();
+
+  FileWatcherEventType getType();
+}

wsagent/che-core-api-project-shared/src/main/java/org/eclipse/che/api/project/shared/dto/event/FileWatcherEventType.java

@@ -10,7 +10,11 @@
  */
 package org.eclipse.che.api.project.shared.dto.event;
 
-/** @author andrew00x */
+/**
+ * todo(vzhukovskyi): need to move this enumeration outside from dto package
+ *
+ * @author andrew00x
+ */
 public enum FileWatcherEventType {
   CREATED,
   DELETED,

wsagent/che-core-api-project-shared/src/main/java/org/eclipse/che/api/project/shared/dto/event/ProjectTreeStateUpdateDto.java

@@ -10,10 +10,11 @@
  */
 package org.eclipse.che.api.project.shared.dto.event;
 
+import org.eclipse.che.api.project.shared.FileChange;
 import org.eclipse.che.dto.shared.DTO;
 
 @DTO
-public interface ProjectTreeStateUpdateDto {
+public interface ProjectTreeStateUpdateDto extends FileChange {
   String getPath();
 
   ProjectTreeStateUpdateDto withPath(String path);