added default method isInstalled

Author: Kindratte

src/main/java/org/scm4j/deployer/api/IProduct.java

@@ -1,5 +1,9 @@
 package org.scm4j.deployer.api;
 
+import lombok.SneakyThrows;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
 import java.util.Collections;
 import java.util.List;
 
@@ -8,4 +12,17 @@ public interface IProduct {
     default List<String> getDependentProducts() {
         return Collections.emptyList();
     }
+    @SneakyThrows
+    default boolean isInstalled(String productServiceName) {
+        Process p = Runtime.getRuntime().exec("sc queryex type=service");
+        BufferedReader reader = new BufferedReader(new InputStreamReader(
+                p.getInputStream()));
+        String line;
+        while ((line = reader.readLine()) != null) {
+            if (line.contains(productServiceName)) {
+                return true;
+            }
+        }
+        return false;
+    }
 }