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/*
* Copyright (C) 2012 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.loganalysis.parser;
import com.android.loganalysis.item.JavaCrashItem;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* An {@link IParser} to handle Java crashes.
*/
public class JavaCrashParser implements IParser {
/**
* Matches: java.lang.Exception
* Matches: java.lang.Exception: reason
*/
private static final Pattern EXCEPTION = Pattern.compile("^([^\\s:]+)(: (.*))?$");
/**
* Matches: Caused by: java.lang.Exception
*/
private static final Pattern CAUSEDBY = Pattern.compile("^Caused by: .+$");
/**
* Matches: \tat class.method(Class.java:1)
*/
private static final Pattern AT = Pattern.compile("^\tat .+$");
// Sometimes logcat explicitly marks where exception begins and ends
private static final String BEGIN_MARKER = "----- begin exception -----";
private static final String END_MARKER = "----- end exception -----";
/**
* {@inheritDoc}
*
* @return The {@link JavaCrashItem}.
*/
@Override
public JavaCrashItem parse(List<String> lines) {
JavaCrashItem jc = null;
StringBuilder stack = new StringBuilder();
StringBuilder message = new StringBuilder();
boolean inMessage = false;
boolean inCausedBy = false;
boolean inStack = false;
for (String line : lines) {
if (line.contains(BEGIN_MARKER)) {
inMessage = false;
inCausedBy = false;
inStack = false;
stack = new StringBuilder();
message = new StringBuilder();
jc = null;
continue;
}
if (line.contains(END_MARKER)) {
break;
}
if (!inStack) {
Matcher exceptionMatch = EXCEPTION.matcher(line);
if (exceptionMatch.matches()) {
inMessage = true;
inStack = true;
jc = new JavaCrashItem();
jc.setException(exceptionMatch.group(1));
if (exceptionMatch.group(3) != null) {
message.append(exceptionMatch.group(3));
}
}
} else {
// Match: Caused by: java.lang.Exception
Matcher causedByMatch = CAUSEDBY.matcher(line);
if (causedByMatch.matches()) {
inMessage = false;
inCausedBy = true;
}
// Match: \tat class.method(Class.java:1)
Matcher atMatch = AT.matcher(line);
if (atMatch.matches()) {
inMessage = false;
inCausedBy = false;
}
if (!causedByMatch.matches() && !atMatch.matches()) {
if (inMessage) {
message.append("\n");
message.append(line);
}
if (!inMessage && !inCausedBy) {
addMessageStack(jc, message.toString(), stack.toString());
return jc;
}
}
}
if (inStack) {
stack.append(line);
stack.append("\n");
}
}
addMessageStack(jc, message.toString(), stack.toString());
return jc;
}
/**
* Adds the message and stack to the {@link JavaCrashItem}.
*/
private void addMessageStack(JavaCrashItem jc, String message, String stack) {
if (jc != null) {
if (message.length() > 0) {
jc.setMessage(message);
}
jc.setStack(stack.trim());
}
}
}
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