/*
 * Copyright 2005, Sixth and Red River Software
 *
 *  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 com.sixrr.stockmetrics.classCalculators;

import com.intellij.psi.JavaRecursiveElementVisitor;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElementVisitor;

import java.util.HashSet;
import java.util.Set;

public class NumInterfacesImplementedCalculator extends ClassCalculator {

    @Override
    protected PsiElementVisitor createVisitor() {
        return new Visitor();
    }

    private class Visitor extends JavaRecursiveElementVisitor {

        @Override
        public void visitClass(PsiClass aClass) {
            super.visitClass(aClass);
            if (isConcreteClass(aClass)) {
                final Set<PsiClass> implementedInterfaces = new HashSet<PsiClass>(8);
                accumulateInterfaces(aClass, implementedInterfaces);
                final int numInterfaces = implementedInterfaces.size();
                postMetric(aClass, numInterfaces);
            }
        }
    }

    private static void accumulateInterfaces(PsiClass aClass, Set<PsiClass> implementedInterfaces) {
        if (aClass.isInterface()) {
            implementedInterfaces.add(aClass);
        }
        final PsiClass[] supers = aClass.getSupers();
        for (final PsiClass aSuper : supers) {
            accumulateInterfaces(aSuper, implementedInterfaces);
        }
    }
}