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path: root/src/jcgp/backend/function/IntegerArithmetic.java
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package jcgp.backend.function;

import jcgp.backend.population.Connection;

public class IntegerArithmetic extends FunctionSet {
	
	public IntegerArithmetic() {
		name = "Integer Arithmetic";
		functionList = new Function[]{
				new Addition(),
				new Subtraction(),
				new Multiplication(),
				new Division()};
		
		enableAll();
	}
	
	public static class Addition extends Function {
		@Override
		public Integer run(Connection... connections) {
			if (connections.length < 2) {
				throw new IllegalArgumentException("Not enough connections were given.");
			} else {
				Integer arg1 = ((Integer) connections[0].getValue());
				Integer arg2 = ((Integer) connections[1].getValue());
				Integer result = arg1 + arg2;

				return result;
			}
		}

		@Override
		public int getArity() {
			return 2;
		}

		@Override
		public String getName() {
			return "Addition";
		}
	}

	public static class Subtraction extends Function {
		@Override
		public Integer run(Connection... connections) {
			if (connections.length < 2) {
				throw new IllegalArgumentException("Not enough connections were given.");
			} else {
				Integer arg1 = ((Integer) connections[0].getValue());
				Integer arg2 = ((Integer) connections[1].getValue());
				Integer result = arg1 - arg2;

				return result;
			}
		}

		@Override
		public int getArity() {
			return 2;
		}

		@Override
		public String getName() {
			return "Subtraction";
		}
	}

	public static class Multiplication extends Function {
		@Override
		public Integer run(Connection... connections) {
			if (connections.length < 2) {
				throw new IllegalArgumentException("Not enough connections were given.");
			} else {
				Integer arg1 = ((Integer) connections[0].getValue());
				Integer arg2 = ((Integer) connections[1].getValue());
				Integer result = arg1 * arg2;
				return result;
			} 
		}

		@Override
		public int getArity() {
			return 2;
		}

		@Override
		public String getName() {
			return "Multiplication";
		}
	}

	public static class Division extends Function {
		@Override
		public Integer run(Connection... connections) {
			if (connections.length < 2) {
				throw new IllegalArgumentException("Not enough connections were given.");
			} else {
				Integer arg1 = ((Integer) connections[0].getValue());
				Integer arg2 = ((Integer) connections[1].getValue());
				Integer result;
				if (arg2 == 0) {
					result = 0;
				} else {
					result = arg1 / arg2;
				}

				return result;
			} 
		}

		@Override
		public int getArity() {
			return 2;
		}

		@Override
		public String getName() {
			return "Division";
		}
	}
	
}