/**

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

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 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

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 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

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 * However, if you add GPL Version 2 code and therefore, elected the GPL

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package org.netbeans.html.boot.impl;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.URL;

import java.util.Collections;

import java.util.Enumeration;

import java.util.Map;

import java.util.Set;

import java.util.TreeSet;

import java.util.WeakHashMap;

import java.util.logging.Level;

import java.util.logging.Logger;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

final class JsPkgCache {

    private final Map<String,Set<String>> props = new WeakHashMap<String, Set<String>>();

    private static final Map<ClassLoader, JsPkgCache> CACHE = new WeakHashMap<ClassLoader, JsPkgCache>();

    private static final Set<String> NONE = Collections.emptySet();

    public static boolean process(ClassLoader l, String className) {

        if (className.equals("org.netbeans.html.boot.impl.Test")) { // NOI18N

            return true;

        }

        Set<String> p;

        JsPkgCache c;

        String pkgName;

        synchronized (CACHE) {

            c = CACHE.get(l);

            if (c == null) {

                c = new JsPkgCache();

                CACHE.put(l, c);

            }

            int lastDot = className.lastIndexOf('.');

            pkgName = className.substring(0, lastDot + 1).replace('.', '/');

            p = c.props.get(pkgName);

            if (p == NONE) {

                return false;

            } else if (p != null) {

                return p.contains(className);

            }

        }

        final String res = pkgName + "net.java.html.js.classes";

        Enumeration<URL> en;

        try {

            en = l.getResources(res);

        } catch (IOException ex) {

            en = null;

        }

        if (en == null || !en.hasMoreElements()) synchronized (CACHE) {

            c.props.put(pkgName, NONE);

            return false;

        }

        try {

            Set<String> arr = new TreeSet<String>();

            while (en.hasMoreElements()) {

                URL u = en.nextElement();

                BufferedReader r = new BufferedReader(

                    new InputStreamReader(u.openStream(), "UTF-8")

                );

                for (;;) {

                    String line = r.readLine();

                    if (line == null) {

                        break;

                    }

                    arr.add(line);

                }

                r.close();

            }

            p = arr;

        } catch (IOException ex) {

            LOG.log(Level.WARNING, "Can't read " + res, ex);

            p = NONE;

        }

        synchronized (CACHE) {

            c.props.put(pkgName, p);

            return p.contains(className);

        }

    }

    private static final Logger LOG = Logger.getLogger(JsPkgCache.class.getName());

}