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/* Size2DSyntax.java --

   Copyright (C) 2003, 2005 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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02110-1301 USA.

Linking this library statically or dynamically with other modules is

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

executable, regardless of the license terms of these independent

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exception statement from your version. */

package javax.print.attribute;

import java.io.Serializable;

/**

 * <code>Size2DSyntax</code> is the abstract base class of all attribute

 * classes which provide a two dimensional size as value (e.g. the size of

 * a media like Letter or A4).

 * <p>

 * A <code>Size2DSyntax</code> instance consists of two integer values

 * describing the size in the x and y dimension. The units of

 * the given values is determined by two defined constants:

 * <ul>

 * <li>INCH - defines an inch</li>

 * <li>MM - defines a millimeter</li>

 * </ul>

 * </p>

 * <p>

 * A size 2D attribute is constructed by two values for the size of the x and

 * y dimension and the actual units of the given values as defined by the

 * constants.

 * </p>

 * <p>

 * There are different methods provided to return the size values for the

 * dimensions in either of the two predefined units or with a given client

 * supplied units conversion factor.

 * </p>

 * <p>

 * <b>Internal storage:</b><br>

 * The size of the x,y dimensions are stored internally in micrometers. The

 * values of the provided constants for inch (value 25400) and millimeters

 * (value 1000) are used as conversion factors to the internal storage units.

 * To get the internal micrometers values a multiplication of a given

 * size value with its units constant value is done. Retrieving the size value

 * for specific units is done by dividing the internal stored value by the

 * units constant value. Clients are therefore able to provide their own

 * size units by supplying other conversion factors.

 * Subclasses of <code>Size2DSyntax</code> have access to the internal

 * size values through the protected methods

 * {@link #getXMicrometers()} and {@link #getYMicrometers()}.

 * </p>

 *

 * @author Michael Koch (konqueror@gmx.de)

 */

public abstract class Size2DSyntax implements Cloneable, Serializable

{

  /**

   * Constant for the units of inches.

   * The actual value is the conversion factor to micrometers.

   */

  public static final int INCH = 25400;

  /**

   * Constant for the units of millimeters.

   * The actual value is the conversion factor to micrometers.

   */

  public static final int MM = 1000;

  /** x size in micrometers. */

  private int x;

  /** y size in micrometers. */

  private int y;

  /**

   * Creates a <code>Size2DSyntax</code> object with the given arguments.

   *

   * @param x the size in x direction

   * @param y the size in y direction

   * @param units the units to use for the sizes

   *

   * @exception IllegalArgumentException if x or y < 0 or units < 1

   */

  protected Size2DSyntax(float x, float y, int units)

  {

    if (x < 0.0f || y < 0.0f)

      throw new IllegalArgumentException("x and/or y may not be less than 0");

    if (units < 1)

      throw new IllegalArgumentException("units may not be less then 1");

    this.x = (int) (x * units + 0.5f);

    this.y = (int) (y * units + 0.5f);

  }

  /**

   * Creates a <code>Size2DSyntax</code> object with the given arguments.

   *

   * @param x the size in x direction

   * @param y the size in y direction

   * @param units the units to use for the sizes

   *

   * @exception IllegalArgumentException if x or y < 0 or units < 1

   */

  protected Size2DSyntax(int x, int y, int units)

  {

    if (x < 0 || y < 0)

      throw new IllegalArgumentException("x and/or y may not be less then 0");

    if (units < 1)

      throw new IllegalArgumentException("units may not be less then 1");

    this.x = x * units;

    this.y = y * units;

  }

  /**

   * Tests if the given object is equal to this object.

   *

   * @param obj the object to test

   *

   * @return <code>true</code> if both objects are equal, <code>false</code> otherwise.

   */

  public boolean equals(Object obj)

  {

    if (! (obj instanceof Size2DSyntax))

      return false;

    Size2DSyntax tmp = (Size2DSyntax) obj;

    return (x == tmp.getXMicrometers()

            && y == tmp.getYMicrometers());

  }

  /**

   * Returns the size described in this object as a two field array.

   * Index 0 contains the size in x direction, index 1 the size in

   * y direction.

   *

   * @param units the units to use

   *

   * @return The array with the size dimensions.

   *

   * @exception IllegalArgumentException if units < 1

   */

  public float[] getSize(int units)

  {

    float[] size = new float[2];

    size[0] = getX(units);

    size[1] = getY(units);

    return size;

  }

  /**

   * Returns the size in x direction.

   *

   * @param units the units to use

   *

   * @return The size in x direction.

   *

   * @exception IllegalArgumentException if units < 1

   */

  public float getX(int units)

  {

    if (units < 1)

      throw new IllegalArgumentException("units may not be less then 1");

    return ((float) x) / ((float) units);

  }

  /**

   * Returns the size in x direction in mircometers.

   * To be used by sublcasses that need access to the internal storage value.

   *

   * @return The size in x direction in micrometers.

   */

  protected int getXMicrometers()

  {

    return x;

  }

  /**

   * Return the size in y direction.

   *

   * @param units the units to use

   *

   * @return The size in y direction.

   *

   * @exception IllegalArgumentException if units < 1

   */

  public float getY(int units)

  {

    if (units < 1)

      throw new IllegalArgumentException("units may not be less then 1");

    return ((float) y) / ((float) units);

  }

  /**

   * Returns the size in y direction in mircometers.

   * To be used by sublcasses that need access to the internal storage value.

   *

   * @return The size in y direction in micrometers.

   */

  protected int getYMicrometers()

  {

    return y;

  }

  /**

   * Returns the hashcode for this object.

   *

   * @return The hashcode.

   */

  public int hashCode()

  {

    return x + y;

  }

  /**

   * Returns the string representation for this object.

   * <p>

   * The returned string is in the form "XxY um" with X standing

   * for size in x and Y for the size in y direction. The used

   * micrometers units is indicated by the appended "um" notation.

   * </p>

   *

   * @return The string representation in micrometers.

   */

  public String toString()

  {

    return getXMicrometers() + "x" + getYMicrometers() + " um";

  }

  /**

   * Returns the string representation for this object.

   * <p>

   * The returned string is in the form "XxY U" with X standing

   * for size in x and Y for the size in y direction. U denotes

   * the units name if one is supplied. The values are given as

   * floating point values.

   * </p>

   *

   * @param units the units to use

   * @param unitsName the name of the units. If <code>null</code>

   * it is ommitted from the string representation.

   *

   * @return The string representation.

   */

  public String toString(int units, String unitsName)

  {

    if (unitsName == null)

      return getX(units) + "x" + getY(units);

    return getX(units) + "x" + getY(units) + " " + unitsName;

  }

}