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annotate src/com/tmate/hgkit/fs/FileWalker.java @ 64:19e9e220bf68

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Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Jan 2011 05:56:43 +0100
parents 4cfc47bc14cc
children
rev   line source
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1 /*
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2 * Copyright (c) 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.fs;
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5
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6 import java.io.File;
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7 import java.util.LinkedList;
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8 import java.util.NoSuchElementException;
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9
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10 /**
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11 *
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12 * @author artem
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13 */
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14 public class FileWalker {
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16 private final File startDir;
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17 private final LinkedList<File> dirQueue;
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18 private final LinkedList<File> fileQueue;
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19 private File nextFile;
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20 private String nextPath;
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21
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22 // FilenameFilter is used in a non-standard way - first argument, dir, is always startDir,
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23 // while second arg, name, is startDir-relative path to the file in question
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24 public FileWalker(File startDir) {
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25 this.startDir = startDir;
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26 dirQueue = new LinkedList<File>();
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27 fileQueue = new LinkedList<File>();
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28 reset();
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29 }
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30
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31 public void reset() {
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32 fileQueue.clear();
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33 dirQueue.clear();
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34 dirQueue.add(startDir);
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35 nextFile = null;
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36 nextPath = null;
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37 }
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38
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39 public boolean hasNext() {
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40 return fill();
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41 }
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43 public void next() {
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44 if (!fill()) {
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45 throw new NoSuchElementException();
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46 }
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47 nextFile = fileQueue.removeFirst();
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48 nextPath = path(nextFile);
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49 }
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51 public String name() {
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52 return nextPath;
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53 }
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54
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55 public File file() {
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56 return nextFile;
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57 }
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58
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59 private String path(File f) {
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60 // XXX LocalHgRepo#normalize
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61 String p = f.getPath().substring(startDir.getPath().length() + 1);
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62 return p.replace('\\', '/').replace("//", "/");
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63 }
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64
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65 private File[] listFiles(File f) {
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66 // in case we need to solve os-related file issues (mac with some encodings?)
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67 return f.listFiles();
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68 }
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69
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70 // return true when fill added any elements to fileQueue.
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71 private boolean fill() {
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72 while (fileQueue.isEmpty()) {
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73 if (dirQueue.isEmpty()) {
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74 return false;
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75 }
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76 while (!dirQueue.isEmpty()) {
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77 File dir = dirQueue.removeFirst();
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78 for (File f : listFiles(dir)) {
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79 if (f.isDirectory()) {
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80 if (!".hg".equals(f.getName())) {
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81 dirQueue.addLast(f);
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82 }
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83 } else {
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84 fileQueue.addLast(f);
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85 }
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86 }
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87 break;
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88 }
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89 }
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90 return !fileQueue.isEmpty();
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91 }
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92 }