1 /*
   2  * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * This source code is provided to illustrate the usage of a given feature
  28  * or technique and has been deliberately simplified. Additional steps
  29  * required for a production-quality application, such as security checks,
  30  * input validation and proper error handling, might not be present in
  31  * this sample code.
  32  */
  33 
  34 
  35 package com.sun.tools.example.debug.gui;
  36 
  37 import java.io.*;
  38 import java.util.*;
  39 
  40 public class SearchPath {
  41 
  42     private String pathString;
  43 
  44     private String[] pathArray;
  45 
  46     public SearchPath(String searchPath) {
  47         //### Should check searchpath for well-formedness.
  48         StringTokenizer st = new StringTokenizer(searchPath, File.pathSeparator);
  49         List<String> dlist = new ArrayList<String>();
  50         while (st.hasMoreTokens()) {
  51             dlist.add(st.nextToken());
  52         }
  53         pathString = searchPath;
  54         pathArray = dlist.toArray(new String[dlist.size()]);
  55     }
  56 
  57     public boolean isEmpty() {
  58         return (pathArray.length == 0);
  59     }
  60 
  61     public String asString() {
  62         return pathString;
  63     }
  64 
  65     public String[] asArray() {
  66         return pathArray.clone();
  67     }
  68 
  69     public File resolve(String relativeFileName) {
  70         for (String element : pathArray) {
  71             File path = new File(element, relativeFileName);
  72             if (path.exists()) {
  73                 return path;
  74             }
  75         }
  76         return null;
  77     }
  78 
  79     //### return List?
  80 
  81     public String[] children(String relativeDirName, FilenameFilter filter) {
  82         // If a file appears at the same relative path
  83         // with respect to multiple entries on the classpath,
  84         // the one corresponding to the earliest entry on the
  85         // classpath is retained.  This is the one that will be
  86         // found if we later do a 'resolve'.
  87         SortedSet<String> s = new TreeSet<String>();  // sorted, no duplicates
  88         for (String element : pathArray) {
  89             File path = new File(element, relativeDirName);
  90             if (path.exists()) {
  91                 String[] childArray = path.list(filter);
  92                 if (childArray != null) {
  93                     for (int j = 0; j < childArray.length; j++) {
  94                         if (!s.contains(childArray[j])) {
  95                             s.add(childArray[j]);
  96                         }
  97                     }
  98                 }
  99             }
 100         }
 101         return s.toArray(new String[s.size()]);
 102     }
 103 
 104 }