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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 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:
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 * 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
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 */

package com.sun.enterprise.module.single;

import java.lang.reflect.InvocationTargetException;
import java.util.jar.Manifest;
import java.util.jar.Attributes;
import java.util.jar.JarFile;
import java.util.*;
import java.net.URL;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Implements a manifest proxying
 *
 * @author Jerome Dochez
 */
public class ManifestProxy extends Manifest {

    public final Map attributes = new HashMap();
    public final Attributes mainAttributes = new Attributes();
    public final Map mappings = new HashMap();

    public ManifestProxy(ClassLoader cl, List mappings) throws IOException {
        try {
            if (mappings != null) {
                for (SeparatorMappings mapping : mappings) {
                    this.mappings.put(mapping.key, mapping.separator);
                }
            }
            Method met  = null;
            Class t = cl.getClass();
            while (t!=null && met==null) {
                try {
                    met = t.getDeclaredMethod("findResources", String.class);
                } catch(NoSuchMethodException e) {
                    // ignore
                }
                t=t.getSuperclass();
            }
            if (met==null) {
                Logger.getLogger(ManifestProxy.class.getName()).log(Level.SEVERE, "Cannot get findResources method handle");
                return;
            }
            Enumeration urls=null;
            try {
                met.setAccessible(true);
                urls = (Enumeration) met.invoke(cl, JarFile.MANIFEST_NAME);
            } catch (IllegalAccessException ex) {
                Logger.getLogger(ManifestProxy.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IllegalArgumentException ex) {
                Logger.getLogger(ManifestProxy.class.getName()).log(Level.SEVERE, null, ex);
            } catch (InvocationTargetException ex) {
                Logger.getLogger(ManifestProxy.class.getName()).log(Level.SEVERE, null, ex);
            }
            if (urls==null) {
                return;
            }
            while (urls.hasMoreElements()) {
                URL url = urls.nextElement();
                InputStream is = null;
                try {
                    is = url.openStream();
                    Manifest m = new Manifest(is);
                    for (Map.Entry attr : m.getEntries().entrySet()) {
                        if (attributes.containsKey(attr.getKey())) {
                            merge(attributes.get(attr.getKey()), attr.getValue());
                        } else {
                            attributes.put(attr.getKey(), new Attributes(attr.getValue()));
                        }
                    }
                    merge(mainAttributes, m.getMainAttributes());
                } finally {
                    if (is != null) {
                        is.close();
                    }
                }
            }
        } catch (SecurityException ex) {
            Logger.getLogger(ManifestProxy.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

    private void merge(Attributes target, Attributes source) {
        for (Object o : source.keySet()) {
            if (target.containsKey(o)) {
                String sep = mappings.containsKey(o.toString())?mappings.get(o.toString()):",";
                String newValue = target.get(o) + sep
                        + source.get(o);
                target.put(o, newValue);
            } else {
                target.put(o, source.get(o));
            }
        }
    }

    @Override
    public Attributes getMainAttributes() {        
        return mainAttributes;
    }

    @Override
    public Map getEntries() {
        return attributes;
    }

    @Override
    public Attributes getAttributes(String name) {
        return attributes.get(name);
    }

    @Override
    public void clear() {
        mainAttributes.clear();
        attributes.clear();
    }

    @Override
    public void write(OutputStream out) throws IOException {
        throw new UnsupportedOperationException("Not implemented");
    }

    @Override
    public void read(InputStream is) throws IOException {
        throw new UnsupportedOperationException("Not implemented");
    }

    public static final class SeparatorMappings {
        final String key;
        final String separator;

        public SeparatorMappings(String key, String separator) {
            this.key = key;
            this.separator = separator;
        }
    }
}