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/**
 * Copyright (C) 2016 - 2030 youtongluan.
 *
 * 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.yx.common.scaner;

import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;

import org.yx.bean.Loader;

public final class ClassScaner {

	private static Function, Collection> scaner = new FileNameScaner(".class");

	public static Function, Collection> getScaner() {
		return scaner;
	}

	public static void setScaner(Function, Collection> scaner) {
		ClassScaner.scaner = Objects.requireNonNull(scaner);
	}

	public static  Set> subClassesInSameOrSubPackage(Class baseClz)
			throws ClassNotFoundException {
		return list(baseClz.getPackage().getName(), baseClz);
	}

	@SuppressWarnings("unchecked")
	public static  Set> list(String packageName, Class baseClz) throws ClassNotFoundException {
		Collection clzNames = listClasses(Collections.singletonList(packageName));
		if (clzNames == null || clzNames.isEmpty()) {
			return Collections.emptySet();
		}
		Set names = new HashSet<>(clzNames);
		Set> set = new HashSet<>();
		for (String className : names) {
			Class clz = Loader.loadClassExactly(className);
			if (baseClz.isAssignableFrom(clz) && (!clz.isInterface())
					&& ((clz.getModifiers() & Modifier.ABSTRACT) == 0)) {
				set.add((Class) clz);
			}
		}
		return set;
	}

	public static Collection listClasses(Collection packageNames) {
		return scaner.apply(packageNames);
	}
}