Do not concatenate strings as arguments to StringBuilder.append()

That more or less defeats the purpose of using a StringBuilder.

Change-Id: I519f7bf1c9b6670e63c3714210f834ee845dc69f
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/BinaryDelta.java

@@ -255,8 +255,13 @@ public class BinaryDelta {
 			shift += 7;
 		} while ((c & 0x80) != 0);
 
-		if (includeHeader)
-			r.append("DELTA( BASE=" + baseLen + " RESULT=" + resLen + " )\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+		if (includeHeader) {
+			r.append("DELTA( BASE="); //$NON-NLS-1$
+			r.append(baseLen);
+			r.append(" RESULT="); //$NON-NLS-1$
+			r.append(resLen);
+			r.append(" )\n"); //$NON-NLS-1$
+		}
 
 		while (deltaPtr < delta.length) {
 			final int cmd = delta[deltaPtr++] & 0xff;
@@ -285,8 +290,11 @@ public class BinaryDelta {
 				if (copySize == 0)
 					copySize = 0x10000;
 
-				r.append("  COPY  (" + copyOffset + ", " + copySize + ")\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
-
+				r.append("  COPY  ("); //$NON-NLS-1$
+				r.append(copyOffset);
+				r.append(", "); //$NON-NLS-1$
+				r.append(copySize);
+				r.append(")\n"); //$NON-NLS-1$
 			} else if (cmd != 0) {
 				// Anything else the data is literal within the delta
 				// itself.

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/ObjectToPack.java

@@ -390,15 +390,15 @@ public class ObjectToPack extends PackedObjectInfo {
 		if (isEdge())
 			buf.append(" edge");
 		if (getDeltaDepth() > 0)
-			buf.append(" depth=" + getDeltaDepth());
+			buf.append(" depth=").append(getDeltaDepth());
 		if (isDeltaRepresentation()) {
 			if (getDeltaBase() != null)
-				buf.append(" base=inpack:" + getDeltaBase().name());
+				buf.append(" base=inpack:").append(getDeltaBase().name());
 			else
-				buf.append(" base=edge:" + getDeltaBaseId().name());
+				buf.append(" base=edge:").append(getDeltaBaseId().name());
 		}
 		if (isWritten())
-			buf.append(" offset=" + getOffset());
+			buf.append(" offset=").append(getOffset());
 		buf.append("]");
 		return buf.toString();
 	}

org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java

@@ -1461,9 +1461,11 @@ public abstract class BaseReceivePack {
 			case REJECTED_MISSING_OBJECT:
 				if (cmd.getMessage() == null)
 					r.append("missing object(s)"); //$NON-NLS-1$
-				else if (cmd.getMessage().length() == Constants.OBJECT_ID_STRING_LENGTH)
-					r.append("object " + cmd.getMessage() + " missing"); //$NON-NLS-1$ //$NON-NLS-2$
-				else
+				else if (cmd.getMessage().length() == Constants.OBJECT_ID_STRING_LENGTH) {
+					r.append("object "); //$NON-NLS-1$
+					r.append(cmd.getMessage());
+					r.append(" missing"); //$NON-NLS-1$
+				} else
 					r.append(cmd.getMessage());
 				break;