init

Enigma/PatchBoard.java

@@ -0,0 +1,59 @@
+/**
+ * Patchboard for a Enigma.
+ */
+public class PatchBoard implements EnigmaComponent {
+    /**
+     * Permutation for the patchboard.
+     */
+    private int[] permu;
+
+    /**
+     * Inverse permutation for the patchboard.
+     */
+    private int[] invPermu;
+
+    /**
+     * Constructor for the patchboard.
+     * @param permu permutation
+     */
+    PatchBoard(final int[] permu) {
+        this.permu = permu;
+        this.invPermu = calcInvPermu(permu);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final int encode(final int i) {
+        return permu[i];
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final int decode(final int i) {
+        return invPermu[i];
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void tick() {   
+    }
+    /**
+     * Calculates the inverese permutation.
+     * @param permu permutation
+     * @return <code>inverse permutation</code>
+     */
+    private int[] calcInvPermu(final int[] permu) {
+        int[] array = new int[permu.length];
+        for (int i = 0; i < permu.length; i++) {
+            for (int k = 0; k < permu.length; k++) {
+               if (i == permu[k]) {
+                    array[i] = k;
+                }
+            }
+        }
+        return array;
+    }
+}