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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 io.microsphere.classloading;

import io.microsphere.lang.Prioritized;
import io.microsphere.logging.Logger;

import javax.annotation.Nonnull;
import java.lang.reflect.Field;
import java.net.URL;
import java.util.Collection;
import java.util.Iterator;
import java.util.Objects;

import static io.microsphere.logging.LoggerFactory.getLogger;
import static io.microsphere.net.URLUtils.EMPTY_URL_ARRAY;
import static io.microsphere.net.URLUtils.resolveBasePath;
import static io.microsphere.reflect.FieldUtils.findField;
import static io.microsphere.reflect.FieldUtils.getFieldValue;
import static io.microsphere.reflect.MethodUtils.invokeMethod;
import static io.microsphere.util.ClassLoaderUtils.resolveClass;
import static java.lang.ClassLoader.getSystemClassLoader;

/**
 * Abstract {@link URLClassPathHandle}
 *
 * @author Mercy
 * @see ClassicURLClassPathHandle
 * @see ModernURLClassPathHandle
 * @see URLClassPathHandle
 * @since 1.0.0
 */
public abstract class AbstractURLClassPathHandle implements URLClassPathHandle, Prioritized {

    private final Logger logger = getLogger(getClass());

    private Class urlClassPathClass;

    /**
     * {@link sun.misc.URLClassPath#path}
     */
    private Field pathField;

    /**
     * {@link sun.misc.URLClassPath#urls}
     */
    private Field urlsField;

    /**
     * {@link sun.misc.URLClassPath#loaders}
     */
    private Field loadersField;

    private Class loaderClass;

    private Field baseField;

    private int priority;

    @Override
    public boolean supports() {
        return getUrlClassPathClass() != null;
    }

    @Nonnull
    @Override
    public URL[] getURLs(ClassLoader classLoader) {
        Object ucp = getFieldValue(classLoader, findUcpField(classLoader));
        return ucp == null ? EMPTY_URL_ARRAY : invokeMethod(ucp, "getURLs");
    }

    @Override
    public final boolean removeURL(ClassLoader classLoader, URL url) {
        Object ucp = getFieldValue(classLoader, findUcpField(classLoader));
        Collection urls = getFieldValue(ucp, getUrlsField());
        Collection path = getFieldValue(ucp, getPathField());
        Collection