xmerge: Convert a primitive type into a string

Avoid unnecessary temporaries when converting primitive data types into a String.

Change-Id: If361383be52d8258be7c8c9bddf3ba05d5ca92c1
Reviewed-on: https://gerrit.libreoffice.org/11026Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>

xmerge/source/xmerge/java/org/openoffice/xmerge/converter/xml/ParaStyle.java

@@ -534,7 +534,7 @@ public class ParaStyle extends Style implements Cloneable {
         for (int i = 0; i <= TEXT_INDENT; i++) {
             if (isSet[i]) {
                 double temp = value[i] / 100.0;
-                String stringVal = (new Double(temp)).toString() + "mm";
+                String stringVal = Double.toString(temp) + "mm";
                 node.setAttribute(attrName[i], stringVal);
             }
         }
@@ -542,10 +542,10 @@ public class ParaStyle extends Style implements Cloneable {
         if (isSet[LINE_HEIGHT]) {
             String stringVal;
             if ((value[LINE_HEIGHT] & LH_PCT) != 0)
-                stringVal = (Integer.valueOf(value[LINE_HEIGHT] & LH_VALUEMASK)).toString() + "%";
+                stringVal = Integer.toString(value[LINE_HEIGHT] & LH_VALUEMASK) + "%";
             else {
                 double temp = (value[LINE_HEIGHT] & LH_VALUEMASK) / 100.0;
-                stringVal = (new Double(temp)).toString() + "mm";
+                stringVal = Double.toString(temp) + "mm";
             }
             node.setAttribute(attrName[LINE_HEIGHT], stringVal);
         }

xmerge/source/xmerge/java/org/openoffice/xmerge/converter/xml/TextStyle.java

@@ -559,8 +559,7 @@ public class TextStyle extends Style implements Cloneable {
                 node.setAttribute("style:text-position", "sub 58%");
 
         if (sizeInPoints != 0) {
-            Integer fs = Integer.valueOf(sizeInPoints);
-            node.setAttribute("fo:font-size", fs.toString() + "pt");
+            node.setAttribute("fo:font-size", Integer.toString(sizeInPoints) + "pt");
         }
 
         if (fontName != null)

xmerge/source/xmerge/java/org/openoffice/xmerge/converter/xml/sxc/CellStyle.java

@@ -412,8 +412,7 @@ public class CellStyle extends Style implements Cloneable {
             node.setAttribute("style:text-position", "sub 58%");
 
         if (fmt.getFontSize() != 0) {
-            Integer fs = Integer.valueOf(fmt.getFontSize());
-            node.setAttribute("fo:font-size", fs.toString() + "pt");
+            node.setAttribute("fo:font-size", Integer.toString(fmt.getFontSize()) + "pt");
         }
 
         if (fmt.getFontName() != null)