RGB.java :  » Code-Analyzer » Java2Html » de » java2html » util » Java Open Source

package de.java2html.util;

/**
 * A color representation similar to {@link java.awt.Color}, but more lightweight, since it does not rquire GUI
 * libraries.
 * @author Markus Gebhard
 */
public class RGB {
  public static final RGB MAGENTA = new RGB(255, 0, 255);
  public static final RGB GREEN = new RGB(0, 255, 0);
  public static final RGB BLACK = new RGB(0, 0, 0);
  public static final RGB RED = new RGB(255, 0, 0);
  public static final RGB WHITE = new RGB(255, 255, 255);
  public static final RGB ORANGE = new RGB(255, 200, 0);
  public final static RGB CYAN = new RGB(0, 255, 255);
  public final static RGB BLUE = new RGB(0, 0, 255);
  public final static RGB LIGHT_GRAY = new RGB(192, 192, 192);
  public final static RGB GRAY = new RGB(128, 128, 128);
  public final static RGB DARK_GRAY = new RGB(64, 64, 64);
  public final static RGB YELLOW = new RGB(255, 255, 0);
  public final static RGB PINK = new RGB(255, 175, 175);

  private int red;
  private int green;
  private int blue;

  public RGB(int red, int green, int blue) {
    assertColorValueRange(red, green, blue);
    this.red = red;
    this.green = green;
    this.blue = blue;
  }

  private static void assertColorValueRange(int red, int green, int blue) {
    boolean rangeError = false;
    String badComponentString = ""; //$NON-NLS-1$
    if (red < 0 || red > 255) {
      rangeError = true;
      badComponentString = badComponentString + " Red"; //$NON-NLS-1$
    }
    if (green < 0 || green > 255) {
      rangeError = true;
      badComponentString = badComponentString + " Green"; //$NON-NLS-1$
    }
    if (blue < 0 || blue > 255) {
      rangeError = true;
      badComponentString = badComponentString + " Blue"; //$NON-NLS-1$
    }
    if (rangeError == true) {
      throw new IllegalArgumentException("Color parameter outside of expected range:" //$NON-NLS-1$
          + badComponentString);
    }
  }

  public int getRed() {
    return red;
  }

  public int getGreen() {
    return green;
  }

  public int getBlue() {
    return blue;
  }

  public boolean equals(Object obj) {
    if (!(obj instanceof RGB)) {
      return false;
    }
    RGB other = (RGB) obj;
    return other.getRed() == getRed()
        && other.getGreen() == getGreen()
        && other.getBlue() == getBlue();
  }

  public int hashCode() {
    return (red & 0xFF) << 16 | (green & 0xFF) << 8 | blue & 0xFF;
  }
  
  /**
   * Returns a string containing a concise, human-readable
   * description of the receiver.
   *
   * @return a string representation of the <code>RGB</code>
   */
  public String toString () {
    return "RGB {" + red + ", " + green + ", " + blue + "}"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
  }
}