/*
   
       dsh-timer  Timer with nanosecond resolution and summary statistics
       on recorded elapsed times.
       Copyright (c) 2004-2013 held jointly by the individual authors.
   
       This library 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.
  
      This library is distributed in the hope that it will be useful, but WITHOUT
      ANY WARRANTY; with out 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 library;  if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
  
      > http://www.fsf.org/licensing/licenses/lgpl.html
      > http://www.opensource.org/licenses/lgpl-license.php
  
  */
  package org.dishevelled.timer.report;
  
  import java.io.IOException;
  
  import java.text.NumberFormat;
  
  import java.util.Map;
  
  import org.dishevelled.timer.Timer;
  
  /**
   * Timer report in tab-delimited text format.
   */
  public final class TextTimerReport
      extends AbstractTimerReport
  {
      private final NumberFormat numberFormat;
  
      public TextTimerReport(final NumberFormat numberFormat)
      {
          this.numberFormat = numberFormat;
      }
  
      /** {@inheritDoc} */
      public <T extends Appendable> T append(final Map<? extends Runnable, Timer> timers, final T appendable)
          throws IOException
      {
          if (timers == null)
          {
              throw new IllegalArgumentException("timers must not be null");
          }
          if (appendable == null)
          {
              throw new IllegalArgumentException("appendable must not be null");
          }
          append(appendable, "Runnable");
          append(appendable, "Size");
          append(appendable, "Min (ns)");
          append(appendable, "Mean (ns)");
          append(appendable, "Max (ns)");
          append(appendable, "Standard Deviation (ns)");
          appendLast(appendable, "Sum (ns)");
  
          for (Map.Entry<? extends Runnable, Timer> entry : timers.entrySet())
          {
              append(appendable, String.valueOf(entry.getKey()));
              append(appendable, numberFormat.format(entry.getValue().size()));
              append(appendable, numberFormat.format(entry.getValue().min()));
              append(appendable, numberFormat.format(entry.getValue().mean()));
              append(appendable, numberFormat.format(entry.getValue().max()));
              append(appendable, numberFormat.format(entry.getValue().standardDeviation()));
              appendLast(appendable, numberFormat.format(entry.getValue().sum()));
          }
          return appendable;
      }
  
      private static <T extends Appendable> void append(final T appendable, final String value) throws IOException
      {
          appendable.append(value);
          appendable.append("\t");
      }
  
      private static <T extends Appendable> void appendLast(final T appendable, final String value) throws IOException
      {
          appendable.append(value);
          appendable.append("\n");
      }
  }