hudson.plugins.timestamper.annotator.ConsoleLogParserImpl.java Source code

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Here is the source code for hudson.plugins.timestamper.annotator.ConsoleLogParserImpl.java

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/*
 * The MIT License
 * 
 * Copyright (c) 2013 Steven G. Brown
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package hudson.plugins.timestamper.annotator;

import hudson.model.Run;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.annotation.concurrent.Immutable;

import com.google.common.io.Closeables;

/**
 * Implementation of ConsoleLogParser.
 * 
 * @author Steven G. Brown
 */
@Immutable
class ConsoleLogParserImpl implements ConsoleLogParser {

    private static final long serialVersionUID = 1L;

    private final long pos;

    /**
     * Create a new {@link ConsoleLogParserImpl}.
     * 
     * @param pos
     *          the position to find in the console log file. A non-negative
     *          position is from the start of the file, and a negative position is
     *          back from the end of the file.
     */
    ConsoleLogParserImpl(long pos) {
        this.pos = pos;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ConsoleLogParser.Result seek(Run<?, ?> build) throws IOException {
        ConsoleLogParser.Result result = new ConsoleLogParser.Result();
        result.atNewLine = true;
        InputStream inputStream = new BufferedInputStream(build.getLogInputStream());
        boolean threw = true;
        try {
            long posFromStart = pos;
            if (pos < 0) {
                posFromStart = build.getLogText().length() + pos;
            }
            for (long i = 0; i < posFromStart; i++) {
                int value = inputStream.read();
                if (value == -1) {
                    result.endOfFile = true;
                    break;
                }
                result.atNewLine = value == 0x0A;
                if (result.atNewLine) {
                    result.lineNumber++;
                }
            }
            threw = false;
        } finally {
            Closeables.close(inputStream, threw);
        }
        return result;
    }
}