New download manager error code when we can't resume.

Adding DownloadManager.ERROR_CANNOT_RESUME for when we can't resume an
interrupted download (because the server didn't provide an ETag or
doesn't support range requests), as well as the necessary private
status code in Downloads.Impl.

Change-Id: I5a66f1e1964198552ab2216aa6d3cc0db2254e21

2 files changed, 21 insertions, 1 deletions

diff --git a/core/java/android/net/DownloadManager.java b/core/java/android/net/DownloadManager.java
index e69c324..447e642 100644
--- a/core/java/android/net/DownloadManager.java
+++ b/core/java/android/net/DownloadManager.java
@@ -185,6 +185,12 @@ public class DownloadManager {
     public final static int ERROR_DEVICE_NOT_FOUND = 1007;
 
     /**
+     * Value of {@link #COLUMN_ERROR_CODE} when some possibly transient error occurred but we can't
+     * resume the download.
+     */
+    public final static int ERROR_CANNOT_RESUME = 1008;
+
+    /**
      * Broadcast intent action sent by the download manager when a download completes.
      */
     public final static String ACTION_DOWNLOAD_COMPLETE = "android.intent.action.DOWNLOAD_COMPLETE";
@@ -715,7 +721,8 @@ public class DownloadManager {
             if (translateStatus(status) != STATUS_FAILED) {
                 return 0; // arbitrary value when status is not an error
             }
-            if ((400 <= status && status < 490) || (500 <= status && status < 600)) {
+            if ((400 <= status && status < Downloads.Impl.MIN_ARTIFICIAL_ERROR_STATUS)
+                    || (500 <= status && status < 600)) {
                 // HTTP status code
                 return status;
             }
@@ -740,6 +747,9 @@ public class DownloadManager {
                 case Downloads.STATUS_DEVICE_NOT_FOUND_ERROR:
                     return ERROR_DEVICE_NOT_FOUND;
 
+                case Downloads.Impl.STATUS_CANNOT_RESUME:
+                    return ERROR_CANNOT_RESUME;
+
                 default:
                     return ERROR_UNKNOWN;
             }
diff --git a/core/java/android/provider/Downloads.java b/core/java/android/provider/Downloads.java
index c9b5512..6bf0d5b 100644
--- a/core/java/android/provider/Downloads.java
+++ b/core/java/android/provider/Downloads.java
@@ -1060,6 +1060,16 @@ public final class Downloads {
         public static final int STATUS_PRECONDITION_FAILED = 412;
 
         /**
+         * The lowest-valued error status that is not an actual HTTP status code.
+         */
+        public static final int MIN_ARTIFICIAL_ERROR_STATUS = 489;
+
+        /**
+         * Some possibly transient error occurred, but we can't resume the download.
+         */
+        public static final int STATUS_CANNOT_RESUME = 489;
+
+        /**
          * This download was canceled
          */
         public static final int STATUS_CANCELED = 490;