pl.otros.logview.gui.message.StackTraceFinder.java Source code

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Here is the source code for pl.otros.logview.gui.message.StackTraceFinder.java

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/*******************************************************************************
 * Copyright 2011 Krzysztof Otrebski
 *
 * 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 pl.otros.logview.gui.message;

import org.apache.commons.lang.StringUtils;

import java.util.LinkedList;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StackTraceFinder {

    private static final Pattern exceptionLine = Pattern
            .compile("(\\s*at\\s+([\\w\\d\\.]*\\.)?([\\w\\d\\$]+)\\.([\\d\\w<>]+)\\(([\\d\\w\\.\\u0020:]+)\\))");

    public SortedSet<SubText> findStackTraces(String text) {
        SortedSet<SubText> set = new TreeSet<SubText>();
        LinkedList<Integer> newLineIndexes = new LinkedList<Integer>();
        newLineIndexes.add(0);
        int newLineIndex = -1;
        while ((newLineIndex = StringUtils.indexOf(text, '\n', newLineIndex + 1)) > -1) {
            newLineIndexes.addLast(newLineIndex);
        }
        if (newLineIndexes.getLast() < text.length()) {
            newLineIndexes.addLast(text.length());
        }

        int startLine;
        int endLine;
        boolean found = false;
        int startedLineException = -1;
        for (int i = 0; i < newLineIndexes.size() - 1; i++) {
            startLine = newLineIndexes.get(i);
            endLine = newLineIndexes.get(i + 1);
            String line = text.substring(startLine, endLine);
            Matcher matcher = exceptionLine.matcher(line);
            boolean f = matcher.find();
            if (f && !found) {
                startedLineException = i - 1;
            } else if (!f && found) {
                // exception end
                int start = newLineIndexes.get(startedLineException);
                int end = newLineIndexes.get(i);
                SubText subText = new SubText(start, end);
                set.add(subText);
            }
            found = f;
        }
        // Add stacktrace if string with end of stacktrace
        if (found) {
            int start = newLineIndexes.get(startedLineException);
            int end = newLineIndexes.getLast();
            SubText subText = new SubText(start, end);
            set.add(subText);
        }
        // for (SubText subText : set) {
        // System.out.printf("[%d -> %d] \n\"%s\"", subText.start, subText.end, text.substring(subText.start, subText.end));
        // }
        return set;
    }
}