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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2009 Eric Lafortune (eric (at) graphics.cornell.edu)
      6  *
      7  * This program is free software; you can redistribute it and/or modify it
      8  * under the terms of the GNU General Public License as published by the Free
      9  * Software Foundation; either version 2 of the License, or (at your option)
     10  * any later version.
     11  *
     12  * This program is distributed in the hope that it will be useful, but WITHOUT
     13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
     15  * more details.
     16  *
     17  * You should have received a copy of the GNU General Public License along
     18  * with this program; if not, write to the Free Software Foundation, Inc.,
     19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
     20  */
     21 package proguard;
     22 
     23 import java.io.*;
     24 import java.net.URL;
     25 
     26 
     27 /**
     28  * A <code>WordReader</code> that returns words from a file or a URL.
     29  *
     30  * @author Eric Lafortune
     31  */
     32 public class FileWordReader extends WordReader
     33 {
     34     private final String           name;
     35     private LineNumberReader reader;
     36 
     37 
     38     /**
     39      * Creates a new FileWordReader for the given file.
     40      */
     41     public FileWordReader(File file) throws IOException
     42     {
     43         super(file.getParentFile());
     44 
     45         this.name   = file.getPath();
     46         this.reader = new LineNumberReader(
     47                       new BufferedReader(
     48                       new FileReader(file)));
     49     }
     50 
     51 
     52     /**
     53      * Creates a new FileWordReader for the given URL.
     54      */
     55     public FileWordReader(URL url) throws IOException
     56     {
     57         super(null);
     58 
     59         this.name   = url.toString();
     60         this.reader = new LineNumberReader(
     61                        new BufferedReader(
     62                        new InputStreamReader(url.openStream())));
     63     }
     64 
     65 
     66     // Implementations for WordReader.
     67 
     68     protected String nextLine() throws IOException
     69     {
     70         return reader.readLine();
     71     }
     72 
     73 
     74     protected String lineLocationDescription()
     75     {
     76         return "line " + reader.getLineNumber() + " of file '" + name + "'";
     77     }
     78 
     79 
     80     public void close() throws IOException
     81     {
     82         super.close();
     83 
     84         if (reader != null)
     85         {
     86             reader.close();
     87         }
     88     }
     89 }
     90