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/* Indexer.java -- add index.list file to jar

   Copyright (C) 2006, 2008 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.classpath.tools.jar;

import gnu.java.net.IndexListParser;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.IOException;

import java.io.OutputStream;

import java.text.MessageFormat;

import java.util.Enumeration;

import java.util.LinkedHashSet;

import java.util.StringTokenizer;

import java.util.jar.Attributes;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import java.util.jar.Manifest;

public class Indexer

    extends Updater

{

  private void indexJarFile(StringBuilder result, File fileName,

                            boolean verbose)

    throws IOException

  {

    if (verbose)

      {

        String msg = MessageFormat.format(Messages.getString("Indexer.Indexing"), //$NON-NLS-1$

                                          new Object[] { fileName });

        System.err.println(msg);

      }

    JarFile jf = new JarFile(fileName);

    // Index the files in this jar.

    // The results look a little better if we keep them

    // in insertion order.

    LinkedHashSet<String> entries = new LinkedHashSet<String>();

    Enumeration e = jf.entries();

    while (e.hasMoreElements())

      {

        JarEntry entry = (JarEntry) e.nextElement();

        String name = entry.getName();

        if (name.startsWith("META-INF/")) //$NON-NLS-1$

          continue;

        int index = name.lastIndexOf('/');

        if (index != -1)

          name = name.substring(0, index);

        entries.add(name);

      }

    if (! entries.isEmpty())

      {

        result.append(fileName);

        // Any line ending will do.

        result.append('\n');

        for (String s : entries)

          {

            result.append(s);

            result.append('\n');

          }

        // Paragraph break.

        result.append('\n');

      }

    // Now read pointed-to jars.

    Manifest m = jf.getManifest();

    if (m != null)

      {

        File parent = fileName.getParentFile();

        Attributes attrs = m.getMainAttributes();

        String jars = attrs.getValue(Attributes.Name.CLASS_PATH);

        if (jars != null)

          {

            StringTokenizer st = new StringTokenizer(jars, " "); //$NON-NLS-1$

            while (st.hasMoreTokens())

              {

                String name = st.nextToken();

                indexJarFile(result, new File(parent, name), verbose);

              }

          }

      }

    jf.close();

  }

  protected void writeCommandLineEntries(Main parameters, OutputStream os)

    throws IOException

  {

    // This is a pretty lame design.  We know the super call will

    // only have side effects and won't actually write anything important.

    super.writeCommandLineEntries(parameters, os);

    // Now compute our index file and write it.

    StringBuilder contents = new StringBuilder();

    indexJarFile(contents, parameters.archiveFile, parameters.verbose);

    if (contents.length() != 0)

      {

        // Insert in reverse order to avoid computing anything.

        contents.insert(0, "1.0\n\n"); //$NON-NLS-1$

        contents.insert(0, IndexListParser.JAR_INDEX_VERSION_KEY);

        ByteArrayInputStream in

          = new ByteArrayInputStream(contents.toString().getBytes());

        writeFile(false, in, IndexListParser.JAR_INDEX_FILE, parameters.verbose);

      }

  }

}