xmerge: Use J2SE 5.0 String.{replace|contains}

Replace "String.indexOf(String str)!=-1" with String.contains(String str)
Use J2SE 5.0 String String.replace(CharSequence target, CharSequence replacement).
Format code in needsMask function.

Change-Id: I787a61c4c090f95fb3862390cc1198f7209163a3
Reviewed-on: https://gerrit.libreoffice.org/10659Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>

xmerge/source/bridge/java/XMergeBridge.java

@@ -301,20 +301,19 @@ public class XMergeBridge {
     }
 
     public String needsMask(String origString){
-        if (origString.indexOf("&")!=-1){
-        origString=replace(origString,"&","&");
+        if (origString.contains("&")) {
+            origString = origString.replace("&","&");
         }
-         if (origString.indexOf("\"")!=-1){
-        origString=replace(origString,"\"",""");
+        if (origString.contains("\"")) {
+            origString = origString.replace("\"",""");
         }
-        if (origString.indexOf("<")!=-1){
-        origString=replace(origString,"<","&lt;");
+        if (origString.contains("<")) {
+            origString = origString.replace("<","&lt;");
         }
-        if (origString.indexOf(">")!=-1){
-        origString=replace(origString,">","&gt;");
+        if (origString.contains(">")) {
+            origString = origString.replace(">","&gt;");
         }
         return origString;
-
     }
 
 
@@ -545,7 +544,7 @@ public class XMergeBridge {
         private String getPath(URI uri){
         String path = uri.getPath();
         String opSys=System.getProperty("os.name");
-        if(opSys.indexOf("Windows")!=-1){
+        if(opSys.contains("Windows")){
         path= path.replace('/','\\');
         path = path.substring(1);
         }