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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.nfc.cardemulation;
     18 
     19 import android.util.Log;
     20 
     21 import com.android.nfc.NfcService;
     22 import com.android.nfc.cardemulation.RegisteredT3tIdentifiersCache.T3tIdentifier;
     23 
     24 import java.io.FileDescriptor;
     25 import java.io.PrintWriter;
     26 import java.util.ArrayList;
     27 import java.util.List;
     28 
     29 public class SystemCodeRoutingManager {
     30     static final String TAG = "SystemCodeRoutingManager";
     31 
     32     static final boolean DBG = false;
     33 
     34     final Object mLock = new Object();
     35 
     36     List<T3tIdentifier> mConfiguredT3tIdentifiers =
     37             new ArrayList<T3tIdentifier>();
     38 
     39     public boolean configureRouting(List<T3tIdentifier> t3tIdentifiers) {
     40         if (DBG) Log.d(TAG, "configureRouting");
     41         List<T3tIdentifier> toBeAdded = new ArrayList<T3tIdentifier>();
     42         List<T3tIdentifier> toBeRemoved = new ArrayList<T3tIdentifier>();
     43         synchronized (mLock) {
     44             for (T3tIdentifier t3tIdentifier : t3tIdentifiers) {
     45                 if (!mConfiguredT3tIdentifiers.contains(t3tIdentifier)) {
     46                     toBeAdded.add(t3tIdentifier);
     47                 }
     48             }
     49             for (T3tIdentifier t3tIdentifier : mConfiguredT3tIdentifiers) {
     50                 if (!t3tIdentifiers.contains(t3tIdentifier)) {
     51                     toBeRemoved.add(t3tIdentifier);
     52                 }
     53             }
     54             if (toBeAdded.size() <= 0 && toBeRemoved.size() <= 0) {
     55                 Log.d(TAG, "Routing table unchanged, not updating");
     56                 return false;
     57             }
     58             // Update internal structures
     59             for (T3tIdentifier t3tIdentifier : toBeRemoved) {
     60                 if (DBG) Log.d(TAG, "deregisterNfcFSystemCodeonDh:");
     61                 NfcService.getInstance().deregisterT3tIdentifier(
     62                         t3tIdentifier.systemCode, t3tIdentifier.nfcid2);
     63             }
     64             for (T3tIdentifier t3tIdentifier : toBeAdded) {
     65                 if (DBG) Log.d(TAG, "registerNfcFSystemCodeonDh:");
     66                 NfcService.getInstance().registerT3tIdentifier(
     67                         t3tIdentifier.systemCode, t3tIdentifier.nfcid2);
     68             }
     69             if (DBG) {
     70                 Log.d(TAG, "(Before) mConfiguredT3tIdentifiers: size=" +
     71                         mConfiguredT3tIdentifiers.size());
     72                 for (T3tIdentifier t3tIdentifier : mConfiguredT3tIdentifiers) {
     73                     Log.d(TAG, "    " + t3tIdentifier.systemCode +
     74                             "/" + t3tIdentifier.nfcid2);
     75                 }
     76                 Log.d(TAG, "(After) mConfiguredT3tIdentifiers: size=" +
     77                         t3tIdentifiers.size());
     78                 for (T3tIdentifier t3tIdentifier : t3tIdentifiers) {
     79                     Log.d(TAG, "    " + t3tIdentifier.systemCode +
     80                             "/" + t3tIdentifier.nfcid2);
     81                 }
     82             }
     83             mConfiguredT3tIdentifiers = t3tIdentifiers;
     84         }
     85 
     86         // And finally commit the routing
     87         NfcService.getInstance().commitRouting();
     88 
     89         return true;
     90     }
     91 
     92     /**
     93      * This notifies that the SystemCode routing table in the controller
     94      * has been cleared (usually due to NFC being turned off).
     95      */
     96     public void onNfccRoutingTableCleared() {
     97         // The routing table in the controller was cleared
     98         // To stay in sync, clear our own tables.
     99         synchronized (mLock) {
    100             if (DBG) Log.d(TAG, "onNfccRoutingTableCleared");
    101             NfcService.getInstance().clearT3tIdentifiersCache();
    102             mConfiguredT3tIdentifiers.clear();
    103         }
    104     }
    105 
    106     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    107         pw.println("Routing table:");
    108         synchronized (mLock) {
    109             for (T3tIdentifier t3tIdentifier : mConfiguredT3tIdentifiers) {
    110                 pw.println("    " + t3tIdentifier.systemCode +
    111                         "/" + t3tIdentifier.nfcid2);
    112             }
    113         }
    114     }
    115 }
    116