Makes PhoneNumberUtils support international numbers after a CLIR command.

Makes PhoneNumberUtils.java support numbers in international
format (starting with ‘+’ character) after a CLIR command.

Previously a plus character would always be removed unless it
occupied the first position of the number string. In this case,
when the number is preceded by #31# (CLIR), the plus character
will be removed as well.

This is an error, prohibiting a type approval of the phone.

This change will detect the plus character after the CLIR command
and will insert it at the right position.

Change-Id: Ib220aee7b3eda30cde960db8c7470523dc5fd313

telephony/java/android/telephony/PhoneNumberUtils.java

@@ -54,6 +54,12 @@ public class PhoneNumberUtils
     public static final char WAIT = ';';
     public static final char WILD = 'N';
 
+    /*
+     * Calling Line Identification Restriction (CLIR)
+     */
+    private static final String CLIR_ON = "*31#+";
+    private static final String CLIR_OFF = "#31#+";
+
     /*
      * TOA = TON + NPI
      * See TS 24.008 section 10.5.4.7 for details.
@@ -179,8 +185,6 @@ public class PhoneNumberUtils
      *  Please note that the GSM wild character is allowed in the result.
      *  This must be resolved before dialing.
      *
-     *  Allows + only in the first  position in the result string.
-     *
      *  Returns null if phoneNumber == null
      */
     public static String
@@ -203,6 +207,11 @@ public class PhoneNumberUtils
             }
         }
 
+        int pos = addPlusChar(phoneNumber);
+        if (pos >= 0 && ret.length() > pos) {
+            ret.insert(pos, '+');
+        }
+
         return ret.toString();
     }
 
@@ -304,6 +313,28 @@ public class PhoneNumberUtils
         }
     }
 
+    /** GSM codes
+     *  Finds if a GSM code includes the international prefix (+).
+     *
+     * @param number the number to dial.
+     *
+     * @return the position where the + char will be inserted, -1 if the GSM code was not found.
+     */
+    private static int
+    addPlusChar(String number) {
+        int pos = -1;
+
+        if (number.startsWith(CLIR_OFF)) {
+            pos = CLIR_OFF.length() - 1;
+        }
+
+        if (number.startsWith(CLIR_ON)) {
+            pos = CLIR_ON.length() - 1;
+        }
+
+        return pos;
+    }
+
     /**
      * Extracts the post-dial sequence of DTMF control digits, pauses, and
      * waits. Strips separators. This string may be empty, but will not be null