content: package mars.venus;
  
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.awt.event.ItemEvent;
  
  import javax.swing.JCheckBox;
  import javax.swing.JCheckBoxMenuItem;
  
  import mars.Globals;
  import mars.util.Binary;
  
  /*
   * Copyright (c) 2003-2006, Pete Sanderson and Kenneth Vollmar
   *
   * Developed by Pete Sanderson (psanderson@otterbein.edu) and Kenneth Vollmar
   * (kenvollmar@missouristate.edu)
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   *
   * (MIT license, http://www.opensource.org/licenses/mit-license.html)
   */
  
  /**
   * Use to select base for displaying numbers. Initially the choices are only 10
   * (decimal) and 16 (hex), so I'm using a check box where checked means hex. If
   * base 8 (octal) is added later, the Component will need to change.
   */
  
  public class NumberDisplayBaseChooser extends JCheckBox {
  
  	/**
  	 *
  	 */
  	private static final long serialVersionUID = -2513062747217362756L;
  	public static final int DECIMAL = 10;
  	public static final int HEXADECIMAL = 16;
  	public static final int ASCII = 0;
  	private int base;
  	private JCheckBoxMenuItem settingMenuItem;
  
  	/**
  	 * constructor. It assumes the text will be worded so that a checked box means
  	 * hexadecimal!
  	 *
  	 * @param text        Text to accompany the check box.
  	 * @param defaultBase Currently either DECIMAL or HEXADECIMAL
  	 */
  	public NumberDisplayBaseChooser(final String text, final boolean displayInHex) {
  		super(text, displayInHex);
  		base = getBase(displayInHex);
  		addItemListener(ie -> {
  			final NumberDisplayBaseChooser choose = (NumberDisplayBaseChooser) ie.getItem();
  			if (ie.getStateChange() == ItemEvent.SELECTED) {
  				choose.setBase(NumberDisplayBaseChooser.HEXADECIMAL);
  			} else {
  				choose.setBase(NumberDisplayBaseChooser.DECIMAL);
  			}
  			// Better to use notify, but I am tired...
  			if (settingMenuItem != null) {
  				settingMenuItem.setSelected(choose.isSelected());
  				final ActionListener[] listeners = settingMenuItem.getActionListeners();
  				final ActionEvent event = new ActionEvent(settingMenuItem, 0, "chooser");
  				for (int i = 0; i < listeners.length; i++) {
  					listeners[i].actionPerformed(event);
  				}
  			}
  			// Better to use notify, but I am tired...
  			Globals.getGui().getMainPane().getExecutePane().numberDisplayBaseChanged(choose);
  		});
  	}
  
  	/**
  	 * Retrieve the current number base.
  	 *
  	 * @return current number base, currently DECIMAL or HEXADECIMAL
  	 */
  	public int getBase() { return base; }
  
  	/**
  	 * Set the current number base.
  	 *
  	 * @param newBase The new number base. Currently, if it is neither DECIMAL nor
  	 *                HEXADECIMAL, the base will not be changed.
  	 */
  	public void setBase(final int newBase) {
  		if (newBase == DECIMAL || newBase == HEXADECIMAL) { base = newBase; }
  	}
  
  	/**
  	 * Produces a string form of an unsigned given the value and the numerical base
  	 * to convert it to. This class method can be used by anyone anytime. If base is
  	 * 16, result is same as for formatNumber(). If base is 10, will produce string
  	 * version of unsigned value. E.g. 0xffffffff will produce "4294967295" instead
  	 * of "-1".
  	 *
  	 * @param value the number to be converted
  	 * @param base  the numerical base to use (currently 10 or 16)
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public static String formatUnsignedInteger(final int value, final int base) {
  		if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  			return Binary.intToHexString(value);
  		} else {
  			return Binary.unsignedIntToIntString(value);
  		}
  	}
  
  	/**
  	 * Produces a string form of an integer given the value and the numerical base
  	 * to convert it to. There is an instance method that uses the internally stored
  	 * base. This class method can be used by anyone anytime.
  	 *
  	 * @param value the number to be converted
  	 * @param base  the numerical base to use (currently 10 or 16)
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public static String formatNumber(final int value, final int base) {
  		String result;
  		switch (base) {
  		case HEXADECIMAL:
  			result = Binary.intToHexString(value);
  			break;
  		case DECIMAL:
  			result = Integer.toString(value);
  			break;
  		case ASCII:
  			result = Binary.intToAscii(value);
  			break;
  		default:
  			result = Integer.toString(value);
  		}
  		return result;
  		//          if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  		//             return Binary.intToHexString(value);
  		//          }
  		//          else {
  		//             return Integer.toString(value);
  		//          }
  	}
  
  	/**
  	 * Produces a string form of a float given the value and the numerical base to
  	 * convert it to. There is an instance method that uses the internally stored
  	 * base. This class method can be used by anyone anytime.
  	 *
  	 * @param value the number to be converted
  	 * @param base  the numerical base to use (currently 10 or 16)
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public static String formatNumber(final float value, final int base) {
  		if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  			return Binary.intToHexString(Float.floatToIntBits(value));
  		} else {
  			return Float.toString(value);
  		}
  	}
  
  	/**
  	 * Produces a string form of a double given the value and the numerical base to
  	 * convert it to. There is an instance method that uses the internally stored
  	 * base. This class method can be used by anyone anytime.
  	 *
  	 * @param value the number to be converted
  	 * @param base  the numerical base to use (currently 10 or 16)
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public static String formatNumber(final double value, final int base) {
  		if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  			final long lguy = Double.doubleToLongBits(value);
  			return Binary.intToHexString(Binary.highOrderLongToInt(lguy)) + Binary.intToHexString(Binary
  					.lowOrderLongToInt(lguy)).substring(2);
  		} else {
  			return Double.toString(value);
  		}
  	}
  
  	/**
  	 * Produces a string form of a number given the value. There is also an class
  	 * (static method) that uses a specified base.
  	 *
  	 * @param value the number to be converted
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public String formatNumber(final int value) {
  		if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  			return Binary.intToHexString(value);
  		} else {
  			return new Integer(value).toString();
  		}
  	}
  
  	/**
  	 * Produces a string form of an unsigned integer given the value. There is also
  	 * an class (static method) that uses a specified base. If the current base is
  	 * 16, this produces the same result as formatNumber().
  	 *
  	 * @param value the number to be converted
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public String formatUnsignedInteger(final int value) {
  		return formatUnsignedInteger(value, base);
  	}
  
  	/**
  	 * Produces a string form of a float given an integer containing the 32 bit
  	 * pattern and the numerical base to use (10 or 16). If the base is 16, the
  	 * string will be built from the 32 bits. If the base is 10, the int bits will
  	 * be converted to float and the string constructed from that. Seems an odd
  	 * distinction to make, except that contents of floating point registers are
  	 * stored internally as int bits. If the int bits represent a NaN value (of
  	 * which there are many!), converting them to float then calling
  	 * formatNumber(float, int) above, causes the float value to become the
  	 * canonical NaN value 0x7fc00000. It does not preserve the bit pattern! Then
  	 * converting it to hex string yields the canonical NaN. Not an issue if display
  	 * base is 10 since result string will be NaN no matter what the internal NaN
  	 * value is.
  	 *
  	 * @param value the int bits to be converted to string of corresponding float.
  	 * @param base  the numerical base to use (currently 10 or 16)
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public static String formatFloatNumber(final int value, final int base) {
  		if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  			return Binary.intToHexString(value);
  		} else {
  			return Float.toString(Float.intBitsToFloat(value));
  		}
  	}
  
  	/**
  	 * Produces a string form of a double given a long containing the 64 bit pattern
  	 * and the numerical base to use (10 or 16). If the base is 16, the string will
  	 * be built from the 64 bits. If the base is 10, the long bits will be converted
  	 * to double and the string constructed from that. Seems an odd distinction to
  	 * make, except that contents of floating point registers are stored internally
  	 * as int bits. If the int bits represent a NaN value (of which there are
  	 * many!), converting them to double then calling formatNumber(double, int)
  	 * above, causes the double value to become the canonical NaN value. It does not
  	 * preserve the bit pattern! Then converting it to hex string yields the
  	 * canonical NaN. Not an issue if display base is 10 since result string will be
  	 * NaN no matter what the internal NaN value is.
  	 *
  	 * @param value the long bits to be converted to string of corresponding double.
  	 * @param base  the numerical base to use (currently 10 or 16)
  	 * @return a String equivalent of the value rendered appropriately.
  	 */
  	public static String formatDoubleNumber(final long value, final int base) {
  		if (base == NumberDisplayBaseChooser.HEXADECIMAL) {
  			return Binary.longToHexString(value);
  		} else {
  			return Double.toString(Double.longBitsToDouble(value));
  		}
  	}
  
  	/**
  	 * Set the menu item from Settings menu that corresponds to this chooser. It is
  	 * the responsibility of that item to register here, because this one is created
  	 * first (before the menu item). They need to communicate with each other so
  	 * that whenever one changes, so does the other. They cannot be the same object
  	 * (one is JCheckBox, the other is JCheckBoxMenuItem).
  	 */
  	public void setSettingsMenuItem(final JCheckBoxMenuItem setter) { settingMenuItem = setter; }
  
  	/**
  	 * Return the number base corresponding to the specified setting.
  	 *
  	 * @return HEXADECIMAL if setting is true, DECIMAL otherwise.
  	 */
  	public static int getBase(final boolean setting) {
  		return setting ? HEXADECIMAL : DECIMAL;
  	}
  }
  