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 package com.android.ddmuilib.logcat; 17 18 import java.util.regex.Matcher; 19 import java.util.regex.Pattern; 20 21 /** 22 * Helper class that can determine if a string matches the exception 23 * stack trace pattern, and if so, can provide the java source file 24 * and line where the exception occured. 25 */ 26 public final class LogCatStackTraceParser { 27 /** Regex to match a stack trace line. E.g.: 28 * at com.foo.Class.method(FileName.extension:10) 29 * extension is typically java, but can be anything (java/groovy/scala/..). 30 */ 31 private static final String EXCEPTION_LINE_REGEX = 32 "\\s*at\\ (.*)\\((.*)\\..*\\:(\\d+)\\)"; //$NON-NLS-1$ 33 34 private static final Pattern EXCEPTION_LINE_PATTERN = 35 Pattern.compile(EXCEPTION_LINE_REGEX); 36 37 /** 38 * Identify if a input line matches the expected pattern 39 * for a stack trace from an exception. 40 */ 41 public boolean isValidExceptionTrace(String line) { 42 return EXCEPTION_LINE_PATTERN.matcher(line).find(); 43 } 44 45 /** 46 * Get fully qualified method name that threw the exception. 47 * @param line line from the stack trace, must have been validated with 48 * {@link LogCatStackTraceParser#isValidExceptionTrace(String)} before calling this method. 49 * @return fully qualified method name 50 */ 51 public String getMethodName(String line) { 52 Matcher m = EXCEPTION_LINE_PATTERN.matcher(line); 53 m.find(); 54 return m.group(1); 55 } 56 57 /** 58 * Get source file name where exception was generated. Input line must be first validated with 59 * {@link LogCatStackTraceParser#isValidExceptionTrace(String)}. 60 */ 61 public String getFileName(String line) { 62 Matcher m = EXCEPTION_LINE_PATTERN.matcher(line); 63 m.find(); 64 return m.group(2); 65 } 66 67 /** 68 * Get line number where exception was generated. Input line must be first validated with 69 * {@link LogCatStackTraceParser#isValidExceptionTrace(String)}. 70 */ 71 public int getLineNumber(String line) { 72 Matcher m = EXCEPTION_LINE_PATTERN.matcher(line); 73 m.find(); 74 try { 75 return Integer.parseInt(m.group(3)); 76 } catch (NumberFormatException e) { 77 return 0; 78 } 79 } 80 81 } 82
