gcc/libjava/javax/print/attribute/ResolutionSyntax.java

/* ResolutionSyntax.java -- 
   Copyright (C) 2003 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
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package javax.print.attribute;

import java.io.Serializable;

/**
 * @author Michael Koch
 */
public abstract class ResolutionSyntax
  implements Cloneable, Serializable
{
  private static final long serialVersionUID = 2706743076526672017L;

  /**
   * Constant for units of dots per centimeter.
   */
  public static final int DPCM = 254;

  /**
   * Constant for units of dots per inch
   */
  public static final int DPI = 100;

  private int crossFeedResolution;
  private int feedResolution;
  
  /**
   * Creates a <code>ResolutionSyntax</code> object with the given arguments.
   *
   * @param crossFeedResolution the cross feed resolution
   * @param feedResolution the feed resolution
   * @param units the unit to use
   *
   * @exception IllegalArgumentException if preconditions fail
   */
  public ResolutionSyntax(int crossFeedResolution, int feedResolution,
                          int units)
  {
    if (crossFeedResolution < 1
        || feedResolution < 1
        || units < 1)
      throw new IllegalArgumentException("no argument may be less then 1");

    this.crossFeedResolution = crossFeedResolution * units;
    this.feedResolution = feedResolution * units;
  }

  /**
   * Tests of obj is equal to this object.
   *
   * @param obj the object to test
   *
   * @returns true if both objects are equal, false otherwise.
   */
  public boolean equals(Object obj)
  {
    if(! (obj instanceof ResolutionSyntax))
      return false;

    ResolutionSyntax tmp = (ResolutionSyntax) obj;
    
    return (crossFeedResolution == tmp.getCrossFeedResolutionDphi()
            && feedResolution == tmp.getFeedResolutionDphi());
  }

  /**
   * Returns the cross feed resolution in units.
   *
   * @return the resolution
   *
   * @exception IllegalArgumenException if units < 1
   */
  public int getCrossFeedResolution(int units)
  {
    if (units < 1)
      throw new IllegalArgumentException("units may not be less then 1");

    int rount = units / 2;
    return (crossFeedResolution + units) / units;
  }

  /**
   * Returns the raw cross feed resolution in units.
   *
   * @return the raw resolution
   */
  protected int getCrossFeedResolutionDphi()
  {
    return crossFeedResolution;
  }

  /**
   * Returns the feed resolution in units.
   *
   * @return the resolution
   *
   * @exception IllegalArgumenException if units < 1
   */
  public int getFeedResolution(int units)
  {
    if (units < 1)
      throw new IllegalArgumentException("units may not be less then 1");

    int rount = units / 2;
    return (crossFeedResolution + units) / units;
  }

  /**
   * Returns the raw feed resolution in units.
   *
   * @return the raw resolution
   */
  protected int getFeedResolutionDphi()
  {
    return feedResolution;
  }
  
  /**
   * Returns the resolution as two field array. Index 0 is the cross feed
   * resolution, index 1 the feed resolution.
   *
   * @param units the units to use
   *
   * @return the array with the resolutions
   */
  public int[] getResolution(int units)
  {
    int[] resolution = new int[2];
    resolution[0] = getCrossFeedResolution(units);
    resolution[1] = getFeedResolution(units);
    return resolution;
  }

  /**
   * Returns the hashcode for this object.
   *
   * @return the hashcode
   */
  public int hashCode()
  {
    return crossFeedResolution + feedResolution;
  }

  /**
   * Checks of other is a lower or equal resolution.
   *
   * @param other the resolution to check against
   *
   * @return true if other describes a lower or equal resolution
   */
  public boolean lessThanOrEquals(ResolutionSyntax other)
  {
    if (other == null)
      throw new NullPointerException("other may not be null");

    return (crossFeedResolution <= other.getCrossFeedResolutionDphi()
            && feedResolution <= other.getFeedResolutionDphi());
  }

  /**
   * Returns the string representation for this object.
   *
   * @return the string representation
   */
  public String toString()
  {
    return toString(1, "dphi");
  }

  /**
   * Returns the string representation for this object.
   *
   * @param units the units to use
   * @param unitsName the name of the units
   *
   * @return the string representation
   */
  public String toString(int units, String unitsName)
  {
    return ("" + getCrossFeedResolution(units)
            + "x" + getFeedResolution(units)
            + " " + unitsName);
  }
}