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SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

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/*
========================================================================
SchemaCrawler
http://www.schemacrawler.com
Copyright (c) 2000-2016, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------

SchemaCrawler 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.

SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.

You may elect to redistribute this code under any of these licenses.

The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html

The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/

========================================================================
*/
package sf.util;


import static java.time.temporal.ChronoField.HOUR_OF_DAY;
import static java.time.temporal.ChronoField.MINUTE_OF_HOUR;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoField.SECOND_OF_MINUTE;

import java.time.Duration;
import java.time.Instant;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.Callable;

public final class StopWatch
{

  private static final class TaskInfo
  {

    private final String taskName;
    private final Duration duration;

    TaskInfo(final String taskName, final Duration duration)
    {
      this.taskName = taskName;
      this.duration = duration;
    }

    public Duration getDuration()
    {
      return duration;
    }

    @Override
    public String toString()
    {
      final LocalTime durationLocal = LocalTime.ofNanoOfDay(duration.toNanos());
      return String.format("%s - \"%s\"", durationLocal.format(df), taskName);
    }

  }

  private static final DateTimeFormatter df = new DateTimeFormatterBuilder()
    .appendValue(HOUR_OF_DAY, 2).appendLiteral(':')
    .appendValue(MINUTE_OF_HOUR, 2).appendLiteral(':')
    .appendValue(SECOND_OF_MINUTE, 2).appendFraction(NANO_OF_SECOND, 3, 3, true)
    .toFormatter();

  private final String id;
  private final List tasks = new LinkedList();

  // State for current task
  private Instant start;
  private boolean running;
  private Duration totalDuration;
  private String currentTaskName;

  public StopWatch(final String id)
  {
    this.id = id;
    totalDuration = Duration.ofNanos(0);
  }

  public String getId()
  {
    return id;
  }

  /**
   * Return whether the stop watch is currently running.
   *
   * @see #currentTaskName()
   */
  public boolean isRunning()
  {
    return running;
  }

  /**
   * Return the number of tasks timed.
   */
  public int size()
  {
    return tasks.size();
  }

  public void start(final String taskName)
  {
    if (running)
    {
      throw new IllegalStateException(String
        .format("Cannot stop \"%s\", since it is already running", id));
    }

    running = true;
    currentTaskName = taskName;
    start = Instant.now();
  }

  public void stop()
  {
    if (!running)
    {
      throw new IllegalStateException(String
        .format("Cannot stop \"%s\", since it is not running", id));
    }

    final Instant stop = Instant.now();
    final Duration runTime = Duration.between(start, stop);

    totalDuration = totalDuration.plus(runTime);

    final TaskInfo lastTaskInfo = new TaskInfo(currentTaskName, runTime);
    tasks.add(lastTaskInfo);

    running = false;
    currentTaskName = null;
    start = null;
  }

  public  V time(final String taskName, final Callable callable)
    throws Exception
  {
    start(taskName);
    final V returnValue = callable.call();
    stop();
    return returnValue;
  }

  @Override
  public String toString()
  {
    final StringBuilder buffer = new StringBuilder(1024);

    final LocalTime totalDurationLocal = LocalTime
      .ofNanoOfDay(totalDuration.toNanos());
    buffer.append(String.format("Total time taken for \"%s\" - %s hours%n",
                                id,
                                totalDurationLocal.format(df)));

    for (final TaskInfo task: tasks)
    {
      buffer.append(String
        .format("- %4.1f%% - %s%n",
                calculatePercentage(task.getDuration(), totalDuration),
                task));
    }

    return buffer.toString();
  }

  private double calculatePercentage(final Duration duration,
                                     final Duration totalDuration)
  {
    final long totalSeconds = totalDuration.getSeconds();
    if (totalSeconds == 0)
    {
      return 0;
    }
    else
    {
      return duration.getSeconds() * 100D / totalSeconds;
    }
  }

}