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Sample of plugin to document and test available APIs
There is a newer version: 5.1
/*
 * SonarQube, open source software quality management tool.
 * Copyright (C) 2008-2014 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * SonarQube is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * SonarQube is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.xoo.lang;

import com.google.common.base.Splitter;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.api.batch.fs.FilePredicates;
import org.sonar.api.batch.fs.FileSystem;
import org.sonar.api.batch.fs.InputFile;
import org.sonar.api.batch.sensor.Sensor;
import org.sonar.api.batch.sensor.SensorContext;
import org.sonar.api.batch.sensor.SensorDescriptor;
import org.sonar.api.batch.sensor.test.TestCaseExecution;
import org.sonar.xoo.Xoo;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

/**
 * Parse files *.xoo.testplan
 */
public class TestCaseSensor implements Sensor {

  private static final Logger LOG = LoggerFactory.getLogger(TestCaseSensor.class);

  private static final String TESTPLAN_EXTENSION = ".testplan";

  private void processFileTestPlan(InputFile inputFile, SensorContext context) {
    File ioFile = inputFile.file();
    File testPlanFile = new File(ioFile.getParentFile(), ioFile.getName() + TESTPLAN_EXTENSION);
    if (testPlanFile.exists()) {
      LOG.debug("Processing " + testPlanFile.getAbsolutePath());
      try {
        List lines = FileUtils.readLines(testPlanFile, context.fileSystem().encoding().name());
        int lineNumber = 0;
        for (String line : lines) {
          lineNumber++;
          if (StringUtils.isBlank(line) || line.startsWith("#")) {
            continue;
          }
          processLine(testPlanFile, lineNumber, line, context, inputFile);
        }
      } catch (IOException e) {
        throw new IllegalStateException(e);
      }
    }
  }

  private void processLine(File testplanFile, int lineNumber, String line, SensorContext context, InputFile testFile) {
    try {
      Iterator split = Splitter.on(":").split(line).iterator();
      String name = split.next();
      String type = split.next();
      String status = split.next();
      String message = split.next();
      String stack = split.next();
      String durationStr = StringUtils.trimToNull(split.next());
      TestCaseExecution test = context.newTestCaseExecution()
        .inTestFile(testFile)
        .name(name)
        .ofType(TestCaseExecution.Type.valueOf(type))
        .status(TestCaseExecution.Status.valueOf(status))
        .message(StringUtils.trimToNull(message))
        .stackTrace(StringUtils.trimToNull(stack));
      if (durationStr != null) {
        test.durationInMs(Long.parseLong(durationStr));
      }
      test.save();
    } catch (Exception e) {
      throw new IllegalStateException("Error processing line " + lineNumber + " of file " + testplanFile.getAbsolutePath(), e);
    }
  }

  @Override
  public void describe(SensorDescriptor descriptor) {
    descriptor
      .name("Xoo TestPlan Sensor")
      .workOnLanguages(Xoo.KEY)
      .workOnFileTypes(InputFile.Type.TEST);
  }

  @Override
  public void execute(SensorContext context) {
    FileSystem fs = context.fileSystem();
    FilePredicates p = fs.predicates();
    for (InputFile file : fs.inputFiles(p.and(p.hasLanguages(Xoo.KEY), p.hasType(InputFile.Type.TEST)))) {
      processFileTestPlan(file, context);
    }
  }
}