/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ddmuilib.logcat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Helper class that can determine if a string matches the exception
* stack trace pattern, and if so, can provide the java source file
* and line where the exception occured.
*/
public final class LogCatStackTraceParser {
/** Regex to match a stack trace line. E.g.:
* at com.foo.Class.method(FileName.extension:10)
* extension is typically java, but can be anything (java/groovy/scala/..).
*/
private static final String EXCEPTION_LINE_REGEX =
"\\s*at\\ (.*)\\((.*)\\..*\\:(\\d+)\\)"; //$NON-NLS-1$
private static final Pattern EXCEPTION_LINE_PATTERN =
Pattern.compile(EXCEPTION_LINE_REGEX);
/**
* Identify if a input line matches the expected pattern
* for a stack trace from an exception.
*/
public boolean isValidExceptionTrace(String line) {
return EXCEPTION_LINE_PATTERN.matcher(line).find();
}
/**
* Get fully qualified method name that threw the exception.
* @param line line from the stack trace, must have been validated with
* {@link LogCatStackTraceParser#isValidExceptionTrace(String)} before calling this method.
* @return fully qualified method name
*/
public String getMethodName(String line) {
Matcher m = EXCEPTION_LINE_PATTERN.matcher(line);
m.find();
return m.group(1);
}
/**
* Get source file name where exception was generated. Input line must be first validated with
* {@link LogCatStackTraceParser#isValidExceptionTrace(String)}.
*/
public String getFileName(String line) {
Matcher m = EXCEPTION_LINE_PATTERN.matcher(line);
m.find();
return m.group(2);
}
/**
* Get line number where exception was generated. Input line must be first validated with
* {@link LogCatStackTraceParser#isValidExceptionTrace(String)}.
*/
public int getLineNumber(String line) {
Matcher m = EXCEPTION_LINE_PATTERN.matcher(line);
m.find();
try {
return Integer.parseInt(m.group(3));
} catch (NumberFormatException e) {
return 0;
}
}
}