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Reflector.java
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Reflector.java
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/**
* Reflector
*
* Models the reflector rotor in the Enigma Machine
*
* @author Alexand Shepherd
*
*/
public class Reflector extends Rotor
{
/**
* Reflector
*
*
* @param type The type of relector this will be
* @throws RotorException
*/
public Reflector(String type) throws RotorException
{
super(type);
}
/**
* initialise
*
* Creates the mapping array from the given type.
*
* @param type The rotor type
* @return True on success
*/
protected boolean initialise(String type)
{
if (type.equals("I"))
{
this.mapping = new int[] { 24, 17, 20, 7, 16, 18, 11, 3, 15, 23, 13, 6, 14, 10, 12, 8, 4, 1, 5, 25, 2, 22, 21, 9, 0, 19 };
}
else if (type.equals("II"))
{
this.mapping = new int[] { 5, 21, 15, 9, 8, 0, 14, 24, 4, 3, 17, 25, 23, 22, 6, 2, 19, 10, 20, 16, 18, 1, 13, 12, 7, 11 };
}
else
{
return false;
}
return true;
}
/**
* substitute
*
* Substitutes the given character for another using
* the mapping array
*
* @param chr The character to substitute
* @return The substituted character
* @throws RotorException
*/
public int substitute(int chr) throws RotorException
{
checkChar(chr);
return this.mapping[chr];
}
}