Home | History | Annotate | Download | only in parser 
      1 /*
      2  * Copyright (C) 2012 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.loganalysis.parser;
     18 
     19 import com.android.loganalysis.item.JavaCrashItem;
     20 
     21 import java.util.List;
     22 import java.util.regex.Matcher;
     23 import java.util.regex.Pattern;
     24 
     25 /**
     26  * An {@link IParser} to handle Java crashes.
     27  */
     28 public class JavaCrashParser implements IParser {
     29 
     30     /**
     31      * Matches: java.lang.Exception
     32      * Matches: java.lang.Exception: reason
     33      */
     34     private static final Pattern EXCEPTION = Pattern.compile("^([^\\s:]+)(: (.*))?$");
     35     /**
     36      * Matches: Caused by: java.lang.Exception
     37      */
     38     private static final Pattern CAUSEDBY = Pattern.compile("^Caused by: .+$");
     39     /**
     40      * Matches: \tat class.method(Class.java:1)
     41      */
     42     private static final Pattern AT = Pattern.compile("^\tat .+$");
     43 
     44     // Sometimes logcat explicitly marks where exception begins and ends
     45     private static final String BEGIN_MARKER = "----- begin exception -----";
     46     private static final String END_MARKER = "----- end exception -----";
     47 
     48     /**
     49      * {@inheritDoc}
     50      *
     51      * @return The {@link JavaCrashItem}.
     52      */
     53     @Override
     54     public JavaCrashItem parse(List<String> lines) {
     55         JavaCrashItem jc = null;
     56         StringBuilder stack = new StringBuilder();
     57         StringBuilder message = new StringBuilder();
     58         boolean inMessage = false;
     59         boolean inCausedBy = false;
     60         boolean inStack = false;
     61 
     62         for (String line : lines) {
     63             if (line.contains(BEGIN_MARKER)) {
     64                 inMessage = false;
     65                 inCausedBy = false;
     66                 inStack = false;
     67                 stack = new StringBuilder();
     68                 message = new StringBuilder();
     69                 jc = null;
     70                 continue;
     71             }
     72             if (line.contains(END_MARKER)) {
     73                 break;
     74             }
     75             if (!inStack) {
     76                 Matcher exceptionMatch = EXCEPTION.matcher(line);
     77                 if (exceptionMatch.matches()) {
     78                     inMessage = true;
     79                     inStack = true;
     80 
     81                     jc = new JavaCrashItem();
     82                     jc.setException(exceptionMatch.group(1));
     83                     if (exceptionMatch.group(3) != null) {
     84                         message.append(exceptionMatch.group(3));
     85                     }
     86                 }
     87             } else {
     88                 // Match: Caused by: java.lang.Exception
     89                 Matcher causedByMatch = CAUSEDBY.matcher(line);
     90                 if (causedByMatch.matches()) {
     91                     inMessage = false;
     92                     inCausedBy = true;
     93                 }
     94 
     95                 // Match: \tat class.method(Class.java:1)
     96                 Matcher atMatch = AT.matcher(line);
     97                 if (atMatch.matches()) {
     98                     inMessage = false;
     99                     inCausedBy = false;
    100                 }
    101 
    102                 if (!causedByMatch.matches() && !atMatch.matches()) {
    103                     if (inMessage) {
    104                         message.append("\n");
    105                         message.append(line);
    106                     }
    107                     if (!inMessage && !inCausedBy) {
    108                         addMessageStack(jc, message.toString(), stack.toString());
    109                         return jc;
    110                     }
    111                 }
    112             }
    113 
    114             if (inStack) {
    115                 stack.append(line);
    116                 stack.append("\n");
    117             }
    118         }
    119 
    120         addMessageStack(jc, message.toString(), stack.toString());
    121         return jc;
    122     }
    123 
    124     /**
    125      * Adds the message and stack to the {@link JavaCrashItem}.
    126      */
    127     private void addMessageStack(JavaCrashItem jc, String message, String stack) {
    128         if (jc != null) {
    129             if (message.length() > 0) {
    130                 jc.setMessage(message);
    131             }
    132             jc.setStack(stack.trim());
    133         }
    134     }
    135 }
    136 
    137