1 /*
2  * Copyright (C) 2014 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.bluetooth.mapclient;
18 
19 import android.util.Log;
20 
21 import java.text.ParseException;
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
24 
25 public final class BmsgTokenizer {
26 
27     private final String mStr;
28 
29     private final Matcher mMatcher;
30     private final int mOffset;
31     private int mPos = 0;
32 
BmsgTokenizer(String str)33     public BmsgTokenizer(String str) {
34         this(str, 0);
35     }
36 
BmsgTokenizer(String str, int offset)37     public BmsgTokenizer(String str, int offset) {
38         mStr = str;
39         mOffset = offset;
40         mMatcher = Pattern.compile("(([^:]*):(.*))?\r\n").matcher(str);
41         mPos = mMatcher.regionStart();
42     }
43 
next(boolean alwaysReturn)44     public Property next(boolean alwaysReturn) throws ParseException {
45         boolean found = false;
46 
47         do {
48             mMatcher.region(mPos, mMatcher.regionEnd());
49 
50             if (!mMatcher.lookingAt()) {
51                 if (alwaysReturn) {
52                     return null;
53                 }
54 
55                 throw new ParseException("Property or empty line expected", pos());
56             }
57 
58             mPos = mMatcher.end();
59 
60             if (mMatcher.group(1) != null) {
61                 found = true;
62             }
63         } while (!found);
64 
65         return new Property(mMatcher.group(2), mMatcher.group(3));
66     }
67 
next()68     public Property next() throws ParseException {
69         return next(false);
70     }
71 
remaining()72     public String remaining() {
73         return mStr.substring(mPos);
74     }
75 
pos()76     public int pos() {
77         return mPos + mOffset;
78     }
79 
80     public static class Property {
81         public final String name;
82         public final String value;
83 
Property(String name, String value)84         public Property(String name, String value) {
85             if (name == null || value == null) {
86                 throw new IllegalArgumentException();
87             }
88 
89             this.name = name;
90             this.value = value;
91 
92             Log.v("BMSG >> ", toString());
93         }
94 
95         @Override
toString()96         public String toString() {
97             return name + ":" + value;
98         }
99 
100         @Override
equals(Object o)101         public boolean equals(Object o) {
102             return ((o instanceof Property) && ((Property) o).name.equals(name)
103                     && ((Property) o).value.equals(value));
104         }
105     }
106 }
107