1 /*
2  * Copyright (C) 2011, 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 android.nfc;
18 
19 import android.os.Parcel;
20 import android.os.Parcelable;
21 
22 import java.io.IOException;
23 
24 /**
25  * Class used to pipe transceive result from the NFC service.
26  *
27  * @hide
28  */
29 public final class TransceiveResult implements Parcelable {
30     public static final int RESULT_SUCCESS = 0;
31     public static final int RESULT_FAILURE = 1;
32     public static final int RESULT_TAGLOST = 2;
33     public static final int RESULT_EXCEEDED_LENGTH = 3;
34 
35     final int mResult;
36     final byte[] mResponseData;
37 
TransceiveResult(final int result, final byte[] data)38     public TransceiveResult(final int result, final byte[] data) {
39         mResult = result;
40         mResponseData = data;
41     }
42 
getResponseOrThrow()43     public byte[] getResponseOrThrow() throws IOException {
44         switch (mResult) {
45             case RESULT_SUCCESS:
46                 return mResponseData;
47             case RESULT_TAGLOST:
48                 throw new TagLostException("Tag was lost.");
49             case RESULT_EXCEEDED_LENGTH:
50                 throw new IOException("Transceive length exceeds supported maximum");
51             default:
52                 throw new IOException("Transceive failed");
53         }
54     }
55 
56     @Override
describeContents()57     public int describeContents() {
58         return 0;
59     }
60 
61     @Override
writeToParcel(Parcel dest, int flags)62     public void writeToParcel(Parcel dest, int flags) {
63         dest.writeInt(mResult);
64         if (mResult == RESULT_SUCCESS) {
65             dest.writeInt(mResponseData.length);
66             dest.writeByteArray(mResponseData);
67         }
68     }
69 
70     public static final Parcelable.Creator<TransceiveResult> CREATOR =
71             new Parcelable.Creator<TransceiveResult>() {
72         @Override
73         public TransceiveResult createFromParcel(Parcel in) {
74             int result = in.readInt();
75             byte[] responseData;
76 
77             if (result == RESULT_SUCCESS) {
78                 int responseLength = in.readInt();
79                 responseData = new byte[responseLength];
80                 in.readByteArray(responseData);
81             } else {
82                 responseData = null;
83             }
84             return new TransceiveResult(result, responseData);
85         }
86 
87         @Override
88         public TransceiveResult[] newArray(int size) {
89             return new TransceiveResult[size];
90         }
91     };
92 
93 }
94