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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, t3tIdentifier.t3tPmm);
     63             }
     64             for (T3tIdentifier t3tIdentifier : toBeAdded) {
     65                 if (DBG) Log.d(TAG, "registerNfcFSystemCodeonDh:");
     66                 NfcService.getInstance().registerT3tIdentifier(
     67                         t3tIdentifier.systemCode, t3tIdentifier.nfcid2 , t3tIdentifier.t3tPmm);
     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.t3tPmm);
     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                             "/" + t3tIdentifier.t3tPmm);
     82                 }
     83             }
     84             mConfiguredT3tIdentifiers = t3tIdentifiers;
     85         }
     86 
     87         // And finally commit the routing
     88         NfcService.getInstance().commitRouting();
     89 
     90         return true;
     91     }
     92 
     93     /**
     94      * This notifies that the SystemCode routing table in the controller
     95      * has been cleared (usually due to NFC being turned off).
     96      */
     97     public void onNfccRoutingTableCleared() {
     98         // The routing table in the controller was cleared
     99         // To stay in sync, clear our own tables.
    100         synchronized (mLock) {
    101             if (DBG) Log.d(TAG, "onNfccRoutingTableCleared");
    102             NfcService.getInstance().clearT3tIdentifiersCache();
    103             mConfiguredT3tIdentifiers.clear();
    104         }
    105     }
    106 
    107     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    108         pw.println("HCE-F routing table:");
    109         synchronized (mLock) {
    110             for (T3tIdentifier t3tIdentifier : mConfiguredT3tIdentifiers) {
    111                 pw.println("    " + t3tIdentifier.systemCode +
    112                         "/" + t3tIdentifier.nfcid2);
    113             }
    114         }
    115     }
    116 }
    117