Add configurable emergency call number support

am: 20c747c038

Change-Id: Id9d5e6bc7026b17c9d52750d1cd506e03ea12b06

core/res/res/values/config.xml

@@ -2595,4 +2595,12 @@
         <!-- Verizon requires any SMS that starts with //VZWVVM to be treated as a VVM SMS-->
         <item>310004,310010,310012,310013,310590,310890,310910,311110,311270,311271,311272,311273,311274,311275,311276,311277,311278,311279,311280,311281,311282,311283,311284,311285,311286,311287,311288,311289,311390,311480,311481,311482,311483,311484,311485,311486,311487,311488,311489;^//VZWVVM.*</item>
     </string-array>
+    <!-- This config is holding calling number conversion map - expected to convert to emergency
+         number. Formats for this config as below:
+         <item>[dialstring1],[dialstring2],[dialstring3]:[replacement]</item>
+
+         E.g. for Taiwan Type Approval, 110 and 119 should be converted to 112.
+         <item>110,119:112</item>
+    -->
+    <string-array translatable="false" name="config_convert_to_emergency_number_map" />
 </resources>

core/res/res/values/symbols.xml

@@ -2708,4 +2708,5 @@
 
   <java-symbol type="drawable" name="ic_restart" />
 
+  <java-symbol type="array" name="config_convert_to_emergency_number_map" />
 </resources>

telephony/java/android/telephony/PhoneNumberUtils.java

@@ -24,6 +24,7 @@ import com.android.i18n.phonenumbers.ShortNumberUtil;
 
 import android.content.Context;
 import android.content.Intent;
+import android.content.res.Resources;
 import android.database.Cursor;
 import android.location.CountryDetector;
 import android.net.Uri;
@@ -3021,4 +3022,79 @@ public class PhoneNumberUtils
         return SubscriptionManager.getDefaultVoiceSubscriptionId();
     }
     //==== End of utility methods used only in compareStrictly() =====
+
+
+    /*
+     * The config held calling number conversion map, expected to convert to emergency number.
+     */
+    private static final String[] CONVERT_TO_EMERGENCY_MAP = Resources.getSystem().getStringArray(
+            com.android.internal.R.array.config_convert_to_emergency_number_map);
+    /**
+     * Check whether conversion to emergency number is enabled
+     *
+     * @return {@code true} when conversion to emergency numbers is enabled,
+     *         {@code false} otherwise
+     *
+     * @hide
+     */
+    public static boolean isConvertToEmergencyNumberEnabled() {
+        return CONVERT_TO_EMERGENCY_MAP != null && CONVERT_TO_EMERGENCY_MAP.length > 0;
+    }
+
+    /**
+     * Converts to emergency number based on the conversion map.
+     * The conversion map is declared as config_convert_to_emergency_number_map.
+     *
+     * Make sure {@link #isConvertToEmergencyNumberEnabled} is true before calling
+     * this function.
+     *
+     * @return The converted emergency number if the number matches conversion map,
+     * otherwise original number.
+     *
+     * @hide
+     */
+    public static String convertToEmergencyNumber(String number) {
+        if (TextUtils.isEmpty(number)) {
+            return number;
+        }
+
+        String normalizedNumber = normalizeNumber(number);
+
+        // The number is already emergency number. Skip conversion.
+        if (isEmergencyNumber(normalizedNumber)) {
+            return number;
+        }
+
+        for (String convertMap : CONVERT_TO_EMERGENCY_MAP) {
+            if (DBG) log("convertToEmergencyNumber: " + convertMap);
+            String[] entry = null;
+            String[] filterNumbers = null;
+            String convertedNumber = null;
+            if (!TextUtils.isEmpty(convertMap)) {
+                entry = convertMap.split(":");
+            }
+            if (entry != null && entry.length == 2) {
+                convertedNumber = entry[1];
+                if (!TextUtils.isEmpty(entry[0])) {
+                    filterNumbers = entry[0].split(",");
+                }
+            }
+            // Skip if the format of entry is invalid
+            if (TextUtils.isEmpty(convertedNumber) || filterNumbers == null
+                    || filterNumbers.length == 0) {
+                continue;
+            }
+
+            for (String filterNumber : filterNumbers) {
+                if (DBG) log("convertToEmergencyNumber: filterNumber = " + filterNumber
+                        + ", convertedNumber = " + convertedNumber);
+                if (!TextUtils.isEmpty(filterNumber) && filterNumber.equals(normalizedNumber)) {
+                    if (DBG) log("convertToEmergencyNumber: Matched. Successfully converted to: "
+                            + convertedNumber);
+                    return convertedNumber;
+                }
+            }
+        }
+        return number;
+    }
 }