Multiplier helper class

parabotv2/src/org/parabot/environment/api/utils/Multipliers.java

@@ -0,0 +1,46 @@
+package org.parabot.environment.api.utils;
+
+import java.math.BigInteger;
+
+/**
+ * 
+ * Helper class for calculating setters for clients that uses multipliers
+ * 
+ * @author Everel
+ *
+ */
+public class Multipliers {
+
+	/**
+	 * 
+	 * @param multiplier
+	 *            the multiplier
+	 * @param set
+	 *            the value you want to set
+	 * @return the correct setter value
+	 */
+	public static int getIntSetter(int multiplier, int set) {
+		int bits = 32;
+		BigInteger quotient = new BigInteger(Integer.toString(multiplier));
+		BigInteger shift = BigInteger.ONE.shiftLeft(bits);
+		int value = quotient.modInverse(shift).intValue();
+		return value * set;
+	}
+
+	/**
+	 * 
+	 * @param multiplier
+	 *            the multiplier
+	 * @param set
+	 *            the value you want to set
+	 * @return the correct setter value
+	 */
+	public static long getLongSetter(long multiplier, long set) {
+		int bits = 64;
+		BigInteger quotient = new BigInteger(Long.toString(multiplier));
+		BigInteger shift = BigInteger.ONE.shiftLeft(bits);
+		long value = quotient.modInverse(shift).longValue();
+		return value * set;
+	}
+
+}