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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * 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
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * 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.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * 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 under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
// Portions Copyright [2018-2020] Payara Foundation and/or affiliates

package org.glassfish.apf.impl;

import java.io.File;
import java.security.PrivilegedAction;
import java.util.Set;
import java.util.Enumeration;
import java.util.HashSet;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import java.util.logging.Level;
import static java.util.stream.Collectors.toSet;
import org.glassfish.apf.Scanner;

/**
 * Implements the scanner interface on a jar file.
 *
 * @author Jerome Dochez
 */
public class JarScanner extends JavaEEScanner implements Scanner {
    
    private File jarFile;
    private Set entries = new HashSet();
    private ClassLoader classLoader = null;
    
    
    @Override
    public  void process(File jarFile, Object bundleDesc, ClassLoader loader) throws java.io.IOException {
        this.jarFile = jarFile;
        
        try (JarFile jf = new JarFile(jarFile)){
            Enumeration entriesEnum = jf.entries();
            while(entriesEnum.hasMoreElements()) {
                JarEntry je = entriesEnum.nextElement();
                if (je.getName().endsWith(".class")) {
                    entries.add(je);
                }
            }        
        }
        initTypes(jarFile);
    }    
    
    @Override
    public ClassLoader getClassLoader() {
        if (classLoader==null) {
            final URL[] urls = new URL[1];
            try {
                if (jarFile == null) throw new IllegalStateException("jarFile must first be set with the process method.");
                urls[0] = jarFile.getAbsoluteFile().toURL();
                classLoader = new PrivilegedAction() {
                  @Override
                  public URLClassLoader run() {
                    return new URLClassLoader(urls);
                  }
                }.run();
            } catch(Exception e) {
                AnnotationUtils.getLogger().log(Level.SEVERE, null, e);
            }
        }
        return classLoader;
    }
    
    @Override
    public Set getElements() {
        return getElements(
                entries.stream()
                .map(JarEntry::getName)
                .collect(toSet())
        );
    }

    @Override
    public Set getElements(Set fileNames) {

        Set elements = new HashSet<>();
        if (getClassLoader() == null) {
            AnnotationUtils.getLogger().severe("Class loader null");
            return elements;
        }
        for (String fileName : fileNames) {
            // convert to a class name...
            String className = fileName.replace(File.separatorChar, '.');
            className = className.substring(0, className.length() - 6);
            try {
                elements.add(classLoader.loadClass(className));

            } catch (ClassNotFoundException cnfe) {
                AnnotationUtils.getLogger().log(Level.SEVERE, null, cnfe);
            }
        }
        return elements;
    }

}
    

    

    
            
    
            







    
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