org.spearce.jgit/src/org/spearce/jgit/treewalk/FileTreeIterator.java

   1 /*
   2  * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  * - Redistributions of source code must retain the above copyright
  12  *   notice, this list of conditions and the following disclaimer.
  13  *
  14  * - Redistributions in binary form must reproduce the above
  15  *   copyright notice, this list of conditions and the following
  16  *   disclaimer in the documentation and/or other materials provided
  17  *   with the distribution.
  18  *
  19  * - Neither the name of the Git Development Community nor the
  20  *   names of its contributors may be used to endorse or promote
  21  *   products derived from this software without specific prior
  22  *   written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  25  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  26  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  34  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 package org.spearce.jgit.treewalk;
  40
  41 import java.io.File;
  42 import java.io.FileInputStream;
  43 import java.io.IOException;
  44 import java.io.InputStream;
  45
  46 import org.spearce.jgit.errors.IncorrectObjectTypeException;
  47 import org.spearce.jgit.lib.FileMode;
  48 import org.spearce.jgit.lib.Repository;
  49 import org.spearce.jgit.util.FS;
  50
  51 /**
  52  * Working directory iterator for standard Java IO.
  53  * <p>
  54  * This iterator uses the standard <code>java.io</code> package to read the
  55  * specified working directory as part of a {@link TreeWalk}.
  56  */
  57 public class FileTreeIterator extends WorkingTreeIterator {
  58         private final File directory;
  59
  60         /**
  61          * Create a new iterator to traverse the given directory and its children.
  62          *
  63          * @param root
  64          *            the starting directory. This directory should correspond to
  65          *            the root of the repository.
  66          */
  67         public FileTreeIterator(final File root) {
  68                 directory = root;
  69                 init(entries());
  70         }
  71
  72         /**
  73          * Create a new iterator to traverse a subdirectory.
  74          *
  75          * @param p
  76          *            the parent iterator we were created from.
  77          * @param root
  78          *            the subdirectory. This should be a directory contained within
  79          *            the parent directory.
  80          */
  81         protected FileTreeIterator(final FileTreeIterator p, final File root) {
  82                 super(p);
  83                 directory = root;
  84                 init(entries());
  85         }
  86
  87         @Override
  88         public AbstractTreeIterator createSubtreeIterator(final Repository repo)
  89                         throws IncorrectObjectTypeException, IOException {
  90                 return new FileTreeIterator(this, ((FileEntry) current()).file);
  91         }
  92
  93         private Entry[] entries() {
  94                 final File[] all = directory.listFiles();
  95                 if (all == null)
  96                         return EOF;
  97                 final Entry[] r = new Entry[all.length];
  98                 for (int i = 0; i < r.length; i++)
  99                         r[i] = new FileEntry(all[i]);
 100                 return r;
 101         }
 102
 103         static class FileEntry extends Entry {
 104                 final File file;
 105
 106                 private final FileMode mode;
 107
 108                 private long length = -1;
 109
 110                 private long lastModified;
 111
 112                 FileEntry(final File f) {
 113                         file = f;
 114
 115                         if (f.isDirectory()) {
 116                                 if (new File(f, ".git").isDirectory())
 117                                         mode = FileMode.GITLINK;
 118                                 else
 119                                         mode = FileMode.TREE;
 120                         } else if (FS.INSTANCE.canExecute(file))
 121                                 mode = FileMode.EXECUTABLE_FILE;
 122                         else
 123                                 mode = FileMode.REGULAR_FILE;
 124                 }
 125
 126                 @Override
 127                 public FileMode getMode() {
 128                         return mode;
 129                 }
 130
 131                 @Override
 132                 public String getName() {
 133                         return file.getName();
 134                 }
 135
 136                 @Override
 137                 public long getLength() {
 138                         if (length < 0)
 139                                 length = file.length();
 140                         return length;
 141                 }
 142
 143                 @Override
 144                 public long getLastModified() {
 145                         if (lastModified == 0)
 146                                 lastModified = file.lastModified();
 147                         return lastModified;
 148                 }
 149
 150                 @Override
 151                 public InputStream openInputStream() throws IOException {
 152                         return new FileInputStream(file);
 153                 }
 154         }
 155 }