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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 org.apache.geronimo.system.main;

import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

import org.apache.geronimo.gbean.AbstractNameQuery;
import org.apache.geronimo.kernel.repository.Artifact;

/**
 * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
 */
public class CommandLineManifest {
    public static final Attributes.Name MAIN_GBEAN = new Attributes.Name("Main-GBean");
    public static final Attributes.Name MAIN_METHOD = new Attributes.Name("Main-Method");
    public static final Attributes.Name CONFIGURATIONS = new Attributes.Name("Configurations");
    public static final Attributes.Name ENDORSED_DIRS = new Attributes.Name("Endorsed-Dirs");
    public static final Attributes.Name EXTENSION_DIRS = new Attributes.Name("Extension-Dirs");

    public static CommandLineManifest getManifestEntries() {
        // find the startup jar
        ClassLoader classLoader = CommandLine.class.getClassLoader();
        URL url = classLoader.getResource("META-INF/startup-jar");
        if (url == null) {
            throw new IllegalArgumentException("Unable to determine location of startup jar");
        }

        // extract the manifest
        Manifest manifest;
        try {
            JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
            manifest = jarConnection.getManifest();
        } catch (IOException e) {
            System.err.println("Startup jar does not contain a manifest: " + url);
            System.exit(1);
            throw new AssertionError();
        }
        Attributes mainAttributes = manifest.getMainAttributes();

        // get the main gbean class
        String mainGBeanString = mainAttributes.getValue(MAIN_GBEAN);

        AbstractNameQuery mainGBean = null;
        if (mainGBeanString != null) {
            try {
                mainGBean = new AbstractNameQuery(new URI(mainGBeanString));
            } catch (URISyntaxException e) {
                System.err.println("Invalid Main-GBean name: " + mainGBeanString);
                System.exit(1);
                throw new AssertionError();
            }
        }

        // get the main method
        String mainMethod = mainAttributes.getValue(MAIN_METHOD);

        // get the list of extra configurations to load
        List configurations = new ArrayList();
        String configurationsString = mainAttributes.getValue(CONFIGURATIONS);
        if (configurationsString != null) {
            for (StringTokenizer tokenizer = new StringTokenizer(configurationsString, " "); tokenizer.hasMoreTokens();)
            {
                String configuration = tokenizer.nextToken();
                configurations.add(Artifact.create(configuration));
            }
        }

        // get the list of endorsed directories
        List endorsedDirs = new ArrayList();
        String endorsedDirsString = mainAttributes.getValue(ENDORSED_DIRS);
        if (endorsedDirsString != null) {
            for (StringTokenizer tokenizer = new StringTokenizer(endorsedDirsString, " "); tokenizer.hasMoreTokens();) {
                String directory = tokenizer.nextToken();
                endorsedDirs.add(directory);
            }
        }

        // get the list of extension directories
        List extensionDirs = new ArrayList();
        String extensionDirsString = mainAttributes.getValue(EXTENSION_DIRS);
        if (extensionDirsString != null) {
            for (StringTokenizer tokenizer = new StringTokenizer(extensionDirsString, " "); tokenizer.hasMoreTokens();)
            {
                String directory = tokenizer.nextToken();
                extensionDirs.add(directory);
            }
        }

        CommandLineManifest commandLineManifest = new CommandLineManifest(mainGBean, mainMethod, configurations, endorsedDirs, extensionDirs);
        return commandLineManifest;
    }

    private final AbstractNameQuery mainGBean;
    private final String mainMethod;
    private final List configurations;
    private final List endorsedDirs;
    private final List extensionDirs;

    public CommandLineManifest(AbstractNameQuery mainGBean, String mainMethod, List configurations, List endorsedDirs, List extensionDirs) {
        this.mainGBean = mainGBean;
        this.mainMethod = mainMethod;
        this.configurations = Collections.unmodifiableList(configurations);
        this.endorsedDirs = endorsedDirs;
        this.extensionDirs = extensionDirs;
    }

    public AbstractNameQuery getMainGBeanQuery() {
        return mainGBean;
    }

    public String getMainMethod() {
        return mainMethod;
    }

    public List getConfigurations() {
        return configurations;
    }

    public List getEndorsedDirs() {
        return endorsedDirs;
    }

    public List getExtensionDirs() {
        return extensionDirs;
    }
}