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A Java implementation of sbt's test interface for JUnit 4

There is a newer version: 1.0.0

package munit.internal.junitinterface;

import sbt.testing.Status;

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

class RunStatistics {
  private final RunSettings settings;

  private int failedCount, ignoredCount, otherCount;
  private final ArrayList failedNames = new ArrayList<>();
  private final ArrayList otherNames = new ArrayList<>();
  private volatile long accumulatedTime;

  RunStatistics(RunSettings settings) {
    this.settings = settings;
  }

  void addTime(long t) { accumulatedTime += t; }

  synchronized void captureStats(AbstractEvent e) {
    Status s = e.status();
    if(s == Status.Error || s == Status.Failure) {
      failedCount++;
      failedNames.add(e.fullyQualifiedName());
    }
    else {
      if(s == Status.Ignored) ignoredCount++;
      else otherCount++;
      otherNames.add(e.fullyQualifiedName());
    }
  }

  private String summaryLine() {
    return (failedCount == 0 ? "All tests passed: " : "Some tests failed: ") +
      failedCount+" failed, "+ignoredCount+" ignored, "+(failedCount+ignoredCount+otherCount)+" total, "+
      (accumulatedTime/1000.0)+"s";
  }

  private static String mkString(List l) {
    StringBuilder b = new StringBuilder();
    for(String s : l) {
      if(b.length() != 0) b.append(", ");
      b.append(s);
    }
    return b.toString();
  }

  synchronized String createSummary() {
    switch(settings.summary) {
      case LIST_FAILED:
        return failedNames.isEmpty() ?
          summaryLine() :
          (summaryLine() + "\n- Failed tests: " + mkString(failedNames));
      case ONE_LINE:
        return summaryLine();
      default:
        return "";
    }
  }
}