package org.java.evolutionary.sequence.func;

import ec.*;
import org.java.evolutionary.sequence.MotifData;
import ec.gp.*;
import ec.util.*;
/**
 *  This represents two things, and implicit Correlation if there are two close positonals 
 *  or explicit correlation between any two things like two positionals not close, one positional
 *  and one compositional, one positional , one disjunctive feature etc etc. 
 *  This adds the conjunctive feature in general to features.
 * @author udaykamath
 *
 */
public class And extends GPNode {
	public String toString() {
		return " AND ";
	}

	public void checkConstraints(final EvolutionState state, final int tree,
			final GPIndividual typicalIndividual, final Parameter individualBase) {
		super.checkConstraints(state, tree, typicalIndividual, individualBase);
		if (children.length != 2)
			state.output.error("Incorrect number of children for node "
					+ toStringForError() + " at " + individualBase);
	}

	public void eval(final EvolutionState state, final int thread,
			final GPData input, final ADFStack stack,
			final GPIndividual individual, final Problem problem) {
		boolean resultLhs, resultRhs;
		MotifData motifData = ((MotifData) (input));

		children[0].eval(state, thread, input, stack, individual, problem);
		resultLhs = motifData.matches;

		children[1].eval(state, thread, input, stack, individual, problem);
		resultRhs = motifData.matches;
		motifData.matches = (resultLhs && resultRhs);
	}
}