ch.qos.logback.decoder.CallerStackTraceParser.java Source code

Introduction

Here is the source code for ch.qos.logback.decoder.CallerStackTraceParser.java

Source

/**
 * Copyright (C) 2013, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.decoder;

import ch.qos.logback.core.pattern.parser2.PatternInfo;
import ch.qos.logback.decoder.regex.RegexPatterns;
import com.google.code.regexp.Matcher;
import com.google.code.regexp.Pattern;
import org.apache.commons.lang3.StringUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * A {@code CallerStackTraceParser} parses a caller-stacktrace field (%caller) from a string
 * and populates the appropriate field in a given logging event
 */
public class CallerStackTraceParser implements FieldCapturer<IStaticLoggingEvent> {
    private static final Pattern PATTERN = Pattern.compile(RegexPatterns.CALLER_STACKTRACE_ELEM_REGEX);
    private static final Pattern PATTERN2 = Pattern.compile("(?<class>" + RegexPatterns.CLASS_OF_CALLER_REGEX + ")"
            + "(\\(" + "(?<file>" + RegexPatterns.FILE_OF_CALLER_REGEX + ")" + ":(?<line>"
            + RegexPatterns.LINE_OF_CALLER_REGEX + ")" + "\\))?");

    @Override
    public void captureField(IStaticLoggingEvent event, String fieldAsStr, PatternInfo info) {

        List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>();
        Matcher m = PATTERN.matcher(fieldAsStr);
        while (m.find()) {
            String line = m.group(1);

            Matcher m2 = PATTERN2.matcher(line);
            if (!m2.find()) {
                continue;
            }

            String className = StringUtils.defaultString(m2.group("class"));
            String fileName = StringUtils.defaultString(m2.group("file"));
            String lineNumberStr = StringUtils.defaultString(m2.group("line"));

            // parse line number from string
            int lineNumber = 0;
            if (lineNumberStr.length() > 0) {
                try {
                    lineNumber = Integer.valueOf(lineNumberStr);
                } catch (NumberFormatException e) {
                    // ignore
                }
            }

            // parse method name from classname field
            int pos = className.lastIndexOf('.');
            String methodName;
            if (pos > -1) {
                methodName = className.substring(className.lastIndexOf('.') + 1);
                className = className.substring(0, pos);
            } else {
                methodName = className;
                className = "";
            }

            stackTrace.add(new StackTraceElement(className, methodName, fileName, lineNumber));
        }

        event.setCallerStackData(stackTrace);
    }

}