/**
 * Copyright (C) 2015 Valkyrie RCP
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.valkyriercp.rules.reporting;

import org.springframework.util.Assert;
import org.valkyriercp.rules.constraint.And;
import org.valkyriercp.rules.constraint.Constraint;
import org.valkyriercp.rules.constraint.Or;
import org.valkyriercp.rules.constraint.property.CompoundPropertyConstraint;
import org.valkyriercp.rules.constraint.property.ParameterizedPropertyConstraint;
import org.valkyriercp.rules.constraint.property.PropertiesConstraint;
import org.valkyriercp.util.ReflectiveVisitorHelper;

import java.util.Iterator;

/**
 * @author Keith Donald
 */
public class SummingVisitor {

	private ReflectiveVisitorHelper visitorSupport = new ReflectiveVisitorHelper();

	private int sum;

	private Constraint constraint;

	public SummingVisitor(Constraint constraint) {
		Assert.notNull(constraint, "constraint is required");
		this.constraint = constraint;
	}

	public int sum() {
		visitorSupport.invokeVisit(this, constraint);
		return sum;
	}

	void visit(CompoundPropertyConstraint rule) {
		visitorSupport.invokeVisit(this, rule.getPredicate());
	}

	void visit(PropertiesConstraint e) {
		sum++;
	}

	void visit(ParameterizedPropertyConstraint e) {
		sum++;
	}

	void visit(And and) {
		Iterator it = and.iterator();
		while (it.hasNext()) {
			Constraint p = (Constraint) it.next();
			visitorSupport.invokeVisit(this, p);
		}
	}

	void visit(Or or) {
		Iterator it = or.iterator();
		while (it.hasNext()) {
			Constraint p = (Constraint) it.next();
			visitorSupport.invokeVisit(this, p);
		}
	}

	void visit(Constraint constraint) {
		sum++;
	}
}