[webnfc] Handle IllegalStateException during read / write operations

device/nfc/android/java/src/org/chromium/device/nfc/NfcTagHandler.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.device.nfc;
 
 import android.nfc.FormatException;
 import android.nfc.NdefMessage;
 import android.nfc.Tag;
 import android.nfc.TagLostException;
@@ skipping 30 matching lines @@
 
         return null;
     }
 
     /**
      * NdefFormatable and Ndef interfaces have different signatures for operating with NFC tags.
      * This interface provides generic methods.
      */
     private interface TagTechnologyHandler {
         public void write(NdefMessage message)
-                throws IOException, TagLostException, FormatException;
-        public NdefMessage read() throws IOException, TagLostException, FormatException;
+                throws IOException, TagLostException, FormatException, IllegalStateException;
+        public NdefMessage read()
+                throws IOException, TagLostException, FormatException, IllegalStateException;
     }
 
     /**
      * Implementation of TagTechnologyHandler that uses Ndef tag technology.
      * @see android.nfc.tech.Ndef
      */
     private static class NdefHandler implements TagTechnologyHandler {
         private final Ndef mNdef;
 
         NdefHandler(Ndef ndef) {
             mNdef = ndef;
         }
 
         @Override
         public void write(NdefMessage message)
-                throws IOException, TagLostException, FormatException {
+                throws IOException, TagLostException, FormatException, IllegalStateException {
             mNdef.writeNdefMessage(message);
         }
 
         @Override
-        public NdefMessage read() throws IOException, TagLostException, FormatException {
+        public NdefMessage read()
+                throws IOException, TagLostException, FormatException, IllegalStateException {
             return mNdef.getNdefMessage();
         }
     }
 
     /**
      * Implementation of TagTechnologyHandler that uses NdefFormatable tag technology.
      * @see android.nfc.tech.NdefFormatable
      */
     private static class NdefFormattableHandler implements TagTechnologyHandler {
         private final NdefFormatable mNdefFormattable;
 
         NdefFormattableHandler(NdefFormatable ndefFormattable) {
             mNdefFormattable = ndefFormattable;
         }
 
         @Override
         public void write(NdefMessage message)
-                throws IOException, TagLostException, FormatException {
+                throws IOException, TagLostException, FormatException, IllegalStateException {
             mNdefFormattable.format(message);
         }
 
         @Override
-        public NdefMessage read() throws IOException, TagLostException, FormatException {
+        public NdefMessage read() throws FormatException {
             return NfcTypeConverter.emptyNdefMessage();
         }
     }
 
     protected NfcTagHandler(TagTechnology tech, TagTechnologyHandler handler) {
         mTech = tech;
         mTechHandler = handler;
     }
 
     /**
@@ skipping 16 matching lines @@
     /**
      * Closes connection.
      */
     public void close() throws IOException {
         mTech.close();
     }
 
     /**
      * Writes NdefMessage to NFC tag.
      */
-    public void write(NdefMessage message) throws IOException, TagLostException, FormatException {
+    public void write(NdefMessage message)
+            throws IOException, TagLostException, FormatException, IllegalStateException {
         mTechHandler.write(message);
     }
 
-    public NdefMessage read() throws IOException, TagLostException, FormatException {
+    public NdefMessage read()
+            throws IOException, TagLostException, FormatException, IllegalStateException {
         return mTechHandler.read();
     }
 
     /**
      * If tag was previously connected and subsequent connection to the same tag fails, consider
      * tag to be out of range.
      */
     public boolean isTagOutOfRange() {
         try {
             connect();
         } catch (IOException e) {
             return mWasConnected;
         }
         return false;
     }
 }