/* gnu.classpath.tools.doclets.htmldoclet.ExternalDocSet
   Copyright (C) 2004 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */

package gnu.classpath.tools.doclets.htmldoclet;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import java.net.MalformedURLException;
import java.net.URL;

import java.util.HashSet;
import java.util.Set;

import com.sun.javadoc.ClassDoc;

public class ExternalDocSet
{
   private String url;
   private String packageListDir;
   private URL docSetDirectoryURL;

   public String getPackageListDir()
   {
      return packageListDir;
   }

   public ExternalDocSet(String url,
                         String packageListDir)
   {
      this.url = url;
      this.packageListDir = packageListDir;
   }

   private Set packageNames = new HashSet();

   public void load(File targetDirectory)
      throws IOException, MalformedURLException
   {
      if (!url.endsWith("/")) {
         url += "/";
      }

      this.docSetDirectoryURL = new URL(targetDirectory.toURL(),
                                        url);

      URL packageListDirURL;
      if (null != packageListDir) {
         packageListDirURL = new URL(new File(System.getProperty("user.dir")).toURL(),
                                     packageListDir);
      }
      else {
         packageListDirURL = docSetDirectoryURL;
      }

      URL packageListURL = new URL(packageListDirURL,
                                    "package-list");
      InputStream in = packageListURL.openStream();
      if (null != in) {
         readPackages(in);
         in.close();
      }
      else {
         throw new FileNotFoundException(packageListURL.toString());
      }
   }

   public String getClassDocURL(String packageName, String typeName)
      throws MalformedURLException
   {
      URL fileURL = new URL(docSetDirectoryURL,
                            packageName.replace('.', '/') + "/" + typeName + ".html");
      return fileURL.toString();
   }

   protected void readPackages(InputStream in)
      throws IOException
   {
      BufferedReader reader
         = new BufferedReader(new InputStreamReader(in, "UTF-8"));
      String line;
      while ((line = reader.readLine()) != null) {
         line = line.trim();
         packageNames.add(line);
      }
   }

   public Set getPackageNames()
   {
      return packageNames;
   }
}