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 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
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 *       contributors may be used to endorse or promote products derived from
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 *
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package com.techempower.util;

import java.util.*;

import com.techempower.helper.*;

/**
 * A minimum and maximum integer, together defining a range.
 */
public class LongRange
  implements Iterable
{

  //
  // Some standard ranges.
  //
  
  public static final LongRange POSITIVE = new LongRange(1, Long.MAX_VALUE);
  public static final LongRange POSITIVE_OR_ZERO = new LongRange(0, Long.MAX_VALUE);
  public static final LongRange NEGATIVE = new LongRange(Long.MIN_VALUE, -1);
  public static final LongRange NEGATIVE_OR_ZERO = new LongRange(Long.MIN_VALUE, 0);

  public final long min;
  public final long max;
  
  /**
   * Constructor.
   */
  public LongRange(long min, long max)
  {
    Args.longMin(max, "max", min);
    this.min = min;
    this.max = max;
  }

  @Override
  public Iterator iterator() {
    return new Iterator() {
      long position = min;
      @Override public void remove() { }
      @Override public Long next() { return position++; }
      @Override public boolean hasNext() { return position <= max; }
    };
  }
  
  /**
   * Return the full extent that the range covers from end to end; the width
   * of the range as depicted on a number line.  For example, the width of
   * the range (0,2) is 2 and the width of (-1,1) is also 2.
   * 
   *    * new LongRange(4,5).span(); // 1
   * 
   */
  public long width()
  {
    return Math.abs(max - min);
  }
  
  /**
   * Return the number of longs contained in this range, inclusive of both
   * edges.  In other words, the count is the width plus 1.  For example, the
   * count of (0,2) is 3 because the range encompasses three longs: 0, 1, 
   * and 2.
   * 
   *    * new LongRange(4,5).count(); // 2
   * 
   */
  public long count()
  {
    return this.width() + 1;
  }
  
  /**
   * Is a provided number in the range?
   */
  public boolean contains(long number)
  {
    return ( (number >= min) && (number <= max) );
  }
  
  /**
   * Bound a provided parameter by this range, meaning that inputs outside
   * of the range will be trimmed to the edge of the range.  An input
   * exceeding the maximum will be set to the maximum; an input lower than
   * the minimum will be set to the minimum.
   */
  public long bound(long number)
  {
    return NumberHelper.boundLong(number, this);
  }

}