add SystemTools.java to wrap Thread.sleep

Author: PhilippSalvisberg

sqldev/src/main/java/org/utplsql/sqldev/model/SystemTools.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2020 Philipp Salvisberg <philipp.salvisberg@trivadis.com>
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.utplsql.sqldev.model;
+
+public class SystemTools {
+    // do not instantiate this class
+    private SystemTools() {
+        super();
+    }
+
+    public static void sleep(int millis) {
+        try {
+            Thread.sleep(millis);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }        
+    }
+}