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      1 /*
      2  * Copyright (C) 2016 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.pbapclient.utils;
     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 
     31     private int mPos = 0;
     32 
     33     private final int mOffset;
     34 
     35     static public class Property {
     36         public final String name;
     37         public final String value;
     38 
     39         public Property(String name, String value) {
     40             if (name == null || value == null) {
     41                 throw new IllegalArgumentException();
     42             }
     43 
     44             this.name = name;
     45             this.value = value;
     46 
     47             Log.v("BMSG >> ", toString());
     48         }
     49 
     50         @Override
     51         public String toString() {
     52             return name + ":" + value;
     53         }
     54 
     55         @Override
     56         public boolean equals(Object o) {
     57             return ((o instanceof Property) && ((Property) o).name.equals(name) && ((Property) o).value
     58                     .equals(value));
     59         }
     60     };
     61 
     62     public BmsgTokenizer(String str) {
     63         this(str, 0);
     64     }
     65 
     66     public BmsgTokenizer(String str, int offset) {
     67         mStr = str;
     68         mOffset = offset;
     69         mMatcher = Pattern.compile("(([^:]*):(.*))?\r\n").matcher(str);
     70         mPos = mMatcher.regionStart();
     71     }
     72 
     73     public Property next(boolean alwaysReturn) throws ParseException {
     74         boolean found = false;
     75 
     76         do {
     77             mMatcher.region(mPos, mMatcher.regionEnd());
     78 
     79             if (!mMatcher.lookingAt()) {
     80                 if (alwaysReturn) {
     81                     return null;
     82                 }
     83 
     84                 throw new ParseException("Property or empty line expected", pos());
     85             }
     86 
     87             mPos = mMatcher.end();
     88 
     89             if (mMatcher.group(1) != null) {
     90                 found = true;
     91             }
     92         } while (!found);
     93 
     94         return new Property(mMatcher.group(2), mMatcher.group(3));
     95     }
     96 
     97     public Property next() throws ParseException {
     98         return next(false);
     99     }
    100 
    101     public String remaining() {
    102         return mStr.substring(mPos);
    103     }
    104 
    105     public int pos() {
    106         return mPos + mOffset;
    107     }
    108 }
    109