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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.ee8.annotations;

import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ClassInheritanceHandler
 *
 * As asm scans for classes, remember the type hierarchy.
 */
public class ClassInheritanceHandler extends AnnotationParser.AbstractHandler {

    private static final Logger LOG = LoggerFactory.getLogger(ClassInheritanceHandler.class);

    Map> _inheritanceMap;

    public ClassInheritanceHandler(Map> map) {
        _inheritanceMap = map;
    }

    @Override
    public void handle(AnnotationParser.ClassInfo classInfo) {
        try {
            //Don't scan Object
            if ("java.lang.Object".equals(classInfo.getClassName()))
                return;
            for (int i = 0; classInfo.getInterfaces() != null && i < classInfo.getInterfaces().length; i++) {
                addToInheritanceMap(classInfo.getInterfaces()[i], classInfo.getClassName());
            }
            //To save memory, we don't record classes that only extend Object, as that can be assumed
            if (!"java.lang.Object".equals(classInfo.getSuperName())) {
                addToInheritanceMap(classInfo.getSuperName(), classInfo.getClassName());
            }
        } catch (Exception e) {
            LOG.warn("Failed to handle {}", classInfo, e);
        }
    }

    private void addToInheritanceMap(String interfaceOrSuperClassName, String implementingOrExtendingClassName) {
        //As it is likely that the interfaceOrSuperClassName is already in the map, try getting it first
        Set implementingClasses = _inheritanceMap.get(interfaceOrSuperClassName);
        //If it isn't in the map, then add it in, but test to make sure that someone else didn't get in
        //first and add it
        if (implementingClasses == null) {
            implementingClasses = ConcurrentHashMap.newKeySet();
            Set tmp = _inheritanceMap.putIfAbsent(interfaceOrSuperClassName, implementingClasses);
            if (tmp != null)
                implementingClasses = tmp;
        }
        implementingClasses.add(implementingOrExtendingClassName);
    }
}