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/**
 * CMI : Cluster Method Invocation
 * Copyright (C) 2008 Bull S.A.S.
 * Contact: [email protected]
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 * --------------------------------------------------------------------------
 * $Id: LoaderUtil.java 1801 2008-05-19 17:22:05Z eyindanga $
 * --------------------------------------------------------------------------
 */

package org.ow2.cmi.loader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * Helper for default archive Loader.
 *
 * @author The new CMI team
 *
 */
public class LoaderUtil {

    /**
     * Gets an URL from a given file.
     *
     * @param file
     *            the given file
     * @return the URL that has been built
     * @throws Exception any.
     */
    public static URL fileToURL2(final File file) throws Exception {
        // check
        if (file == null) {
            throw new Exception("Invalid File. It is null");
        }

        // transform
        try {
            return file.toURI().toURL();
        } catch (MalformedURLException e) {
            throw new Exception("Cannot get URL from the given file '" + file
                    + "'.", e);
        }
    }

    /**
     * Gets the URL of the archive.
     *
     * @param file
     *            the archive.
     * @return URL of archive
     */
    public static URL[] getArchiveUrls(final File file) {
        List clUser = new ArrayList();
        try {
            clUser.add(fileToURL2(file));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return clUser.toArray(new URL[0]);
    }

    /**
     * Create temporary jar with content of archiveData.
     *
     * @param archiveName Name of the archive.
     * @param archiveData Byte array.
     * @return Temporary file containing the byte array.
     * @throws IOException if an exception of this type occurs.
     */
    public static File createTempJarFile(final String archiveName,
            final byte[] archiveData) throws IOException {
        File tempFile = File.createTempFile(archiveName, ".jar");
        tempFile.deleteOnExit();
        FileOutputStream tempFos = new FileOutputStream(tempFile);
        tempFos.write(archiveData);
        tempFos.close();
        return tempFile;
    }

    /**
     * Build an Id for the archive before sharing it to all the cluster.
     *
     * @param archiveHost
     *            owner of the archive.
     * @param location location of the archive.
     * @return The archive Id.
     */
    public static ArchiveId buildArchiveId(final String archiveHost,
            final String location) {
        return new ArchiveId(archiveHost, location);
    }

    /**
     * Build an archiveId> from string fomatted like
     * host_address+archive_location.
     *
     * @param stringArchiveId
     *            The formatted String for given archiveId
     * @return ArchiveId
     */
    public static ArchiveId buildArchiveIdFromFormattedId(
            final String stringArchiveId) {
        String archiveHost = stringArchiveId.substring(0, stringArchiveId
                .indexOf(ArchiveId.SEPARATOR));
        String archiveLocation = stringArchiveId.substring(stringArchiveId
                .indexOf(ArchiveId.SEPARATOR) + 1, stringArchiveId.length());
        ArchiveId ret = buildArchiveId(archiveHost, archiveLocation);
        ret.setName(getNameFromLocation(ret.getLocation()));
        return ret;
    }

    /**
     * Gets the archive name from location.
     * @param location archive location.
     * @return The canonical name of the archive. /toto.jar will return toto
     */
    private static String getNameFromLocation(final String location) {
        if (location == null) {
            return ArchiveId.DEFAULT_NAME;
        }
        int ind = location.lastIndexOf("/");
        if (ind != -1) {
            return location.substring(ind + 1, location.length() - 4);
        }
        return location.substring(0, location.length() - 4);
    }

}