1 /*
   2  * Copyright (c) 2017, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 
  26 package jdk.tools.jaotc.collect;
  27 
  28 import static java.nio.file.FileVisitResult.CONTINUE;
  29 
  30 import java.io.IOException;
  31 import java.nio.file.FileVisitResult;
  32 import java.nio.file.FileVisitor;
  33 import java.nio.file.Files;
  34 import java.nio.file.Path;
  35 import java.nio.file.PathMatcher;
  36 import java.nio.file.SimpleFileVisitor;
  37 import java.nio.file.attribute.BasicFileAttributes;
  38 import java.util.ArrayList;
  39 import java.util.Iterator;
  40 
  41 /**
  42  * {@link FileVisitor} implementation to find class files recursively.
  43  */
  44 public final class FileSystemFinder extends SimpleFileVisitor<Path> implements Iterable<Path> {
  45     private final ArrayList<Path> fileNames = new ArrayList<>();
  46     private final PathMatcher filter;
  47 
  48     public FileSystemFinder(Path combinedPath, PathMatcher filter) {
  49         this.filter = filter;
  50         try {
  51             Files.walkFileTree(combinedPath, this);
  52         } catch (IOException e) {
  53             throw new InternalError(e);
  54         }
  55     }
  56 
  57     /**
  58      * Compares the glob pattern against the file name.
  59      */
  60     private void find(Path file) {
  61         Path name = file.getFileName();
  62         if (name != null && filter.matches(name)) {
  63             fileNames.add(file);
  64         }
  65     }
  66 
  67     @Override
  68     public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
  69         find(file);
  70         return CONTINUE;
  71     }
  72 
  73     @Override
  74     public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
  75         find(dir);
  76         return CONTINUE;
  77     }
  78 
  79     @Override
  80     public Iterator<Path> iterator() {
  81         return fileNames.iterator();
  82     }
  83 }