Add methods to check tag availability

setTagUpToDate:
    record the new tag's cookie while creating a tag object, the value
    could be used to check the tag availability

isTagUpToDate:
    compare the latest cookie to the tag's cookie, which generated
    when it was created, to check whether the tag object is the
    latest or not

Bug: 199291025
Test: test with some reader apps, test pass
Change-Id: Ia1e21a95605020b6af8cceda0869f982048568ba

1 files changed, 20 insertions, 0 deletions

diff --git a/src/com/android/nfc/NfcService.java b/src/com/android/nfc/NfcService.java
index 4b6c0906..2ec29477 100644
--- a/src/com/android/nfc/NfcService.java
+++ b/src/com/android/nfc/NfcService.java
@@ -335,6 +335,9 @@ public class NfcService implements DeviceHostListener {
     boolean mNotifyDispatchFailed;
     boolean mNotifyReadFailed;
 
+    // for recording the latest Tag object cookie
+    long mCookieUpToDate = 0;
+
     private NfcDispatcher mNfcDispatcher;
     private PowerManager mPowerManager;
     private KeyguardManager mKeyguard;
@@ -2051,6 +2054,23 @@ public class NfcService implements DeviceHostListener {
         public boolean getExtendedLengthApdusSupported() throws RemoteException {
             return mDeviceHost.getExtendedLengthApdusSupported();
         }
+
+        @Override
+        public void setTagUpToDate(long cookie) throws RemoteException {
+            if (DBG) Log.d(TAG, "Register Tag " + Long.toString(cookie) + " as the latest");
+            mCookieUpToDate = cookie;
+        }
+
+        @Override
+        public boolean isTagUpToDate(long cookie) throws RemoteException {
+            if (mCookieUpToDate == cookie) {
+                if (DBG) Log.d(TAG, "Tag " + Long.toString(cookie) + " is up to date");
+                return true;
+            }
+
+            if (DBG) Log.d(TAG, "Tag " + Long.toString(cookie) + " is out of date");
+            return false;
+        }
     }
 
     final class NfcDtaService extends INfcDta.Stub {