ComputedQuestion.java

package org.nlamah.QL.Model.Form;

import org.nlamah.QBase.Constants.QBaseQuestionType;
import org.nlamah.QL.Model.Form.Abstract.QLNode;
import org.nlamah.QL.Interfaces.QLFormElementVisitor;
import org.nlamah.QL.Interfaces.QLNodeVisitor;
import org.nlamah.QL.Model.Expression.Abstract.Expression;
import org.nlamah.QL.Model.Expression.Abstract.ValueExpression;
import org.nlamah.QL.Model.Expression.Evaluation.ExpressionEvaluator;
import org.nlamah.QL.Model.Expression.Literal.IdentifierLiteral;
import org.nlamah.QL.Model.Expression.Literal.TextLiteral;
import org.nlamah.QL.Model.Form.Abstract.FormQuestion;

public class ComputedQuestion extends FormQuestion 
{
	private Expression expression;

	public ComputedQuestion(IdentifierLiteral identifier, TextLiteral questionText, QBaseQuestionType type, Expression expression) 
	{
		super(identifier, questionText, type);

		this.expression = expression;

		expression.setParentNode(this);
	}

	public Expression expression()
	{
		return expression;
	}

	@Override
	public ValueExpression value() 
	{
		ExpressionEvaluator evaluation = new ExpressionEvaluator();

		return (ValueExpression) expression.accept(evaluation);
	}

	@Override 
	public boolean equals(Object object) 
	{
		if (!super.equals(object))
		{
			return false;
		}

		if (!(object instanceof ComputedQuestion))
		{
			return false;
		}

		ComputedQuestion value = (ComputedQuestion)object;

		if (!(this.expression.equals(value.expression)))
		{
			return false;
		}

		return true;
	}

	@Override
	public QLNode accept(QLNodeVisitor visitor) 
	{
		return visitor.visit(this);
	}

	@Override
	public void accept(QLFormElementVisitor visitor) 
	{
		visitor.visit(this);	
	}
}