org.argeo.jcr/src/org/argeo/jcr/fs/JcrPath.java

   1 package org.argeo.jcr.fs;
   2
   3 import java.io.File;
   4 import java.io.IOException;
   5 import java.net.URI;
   6 import java.net.URISyntaxException;
   7 import java.nio.file.FileSystem;
   8 import java.nio.file.LinkOption;
   9 import java.nio.file.Path;
  10 import java.nio.file.WatchEvent.Kind;
  11 import java.nio.file.WatchEvent.Modifier;
  12 import java.nio.file.WatchKey;
  13 import java.nio.file.WatchService;
  14 import java.util.Arrays;
  15 import java.util.Iterator;
  16 import java.util.NoSuchElementException;
  17
  18 import javax.jcr.Node;
  19 import javax.jcr.RepositoryException;
  20 import javax.jcr.Session;
  21
  22 public class JcrPath implements Path {
  23         private final static String delimStr = "/";
  24         private final static char delimChar = '/';
  25
  26         private final JcrFileSystem fs;
  27         private final String[] path;// null means root
  28         private final boolean absolute;
  29
  30         // optim
  31         private final int hashCode;
  32
  33         public JcrPath(JcrFileSystem filesSystem, String path) {
  34                 this.fs = filesSystem;
  35                 if (path == null)
  36                         throw new JcrFsException("Path cannot be null");
  37                 if (path.equals(delimStr)) {// root
  38                         this.path = null;
  39                         this.absolute = true;
  40                         this.hashCode = 0;
  41                         return;
  42                 } else if (path.equals("")) {// empty path
  43                         this.path = new String[] { "" };
  44                         this.absolute = false;
  45                         this.hashCode = "".hashCode();
  46                         return;
  47                 }
  48
  49                 if (path.equals("~")) {// home
  50                         path = filesSystem.getUserHomePath();
  51                         if (path == null)
  52                                 throw new JcrFsException("No home directory available");
  53                 }
  54
  55                 this.absolute = path.charAt(0) == delimChar ? true : false;
  56                 String trimmedPath = path.substring(absolute ? 1 : 0,
  57                                 path.charAt(path.length() - 1) == delimChar ? path.length() - 1 : path.length());
  58                 this.path = trimmedPath.split(delimStr);
  59                 for (int i = 0; i < this.path.length; i++) {
  60                         this.path[i] = Text.unescapeIllegalJcrChars(this.path[i]);
  61                 }
  62                 this.hashCode = this.path[this.path.length - 1].hashCode();
  63         }
  64
  65         public JcrPath(JcrFileSystem filesSystem, Node node) throws RepositoryException {
  66                 this(filesSystem, node.getPath());
  67         }
  68
  69         /** Internal optimisation */
  70         private JcrPath(JcrFileSystem filesSystem, String[] path, boolean absolute) {
  71                 this.fs = filesSystem;
  72                 this.path = path;
  73                 this.absolute = path == null ? true : absolute;
  74                 this.hashCode = path == null ? 0 : path[path.length - 1].hashCode();
  75         }
  76
  77         @Override
  78         public FileSystem getFileSystem() {
  79                 return fs;
  80         }
  81
  82         @Override
  83         public boolean isAbsolute() {
  84                 return absolute;
  85         }
  86
  87         @Override
  88         public Path getRoot() {
  89                 try {
  90                         if (path == null)
  91                                 return this;
  92                         return new JcrPath(fs, fs.getSession().getRootNode());
  93                 } catch (RepositoryException e) {
  94                         throw new JcrFsException("Cannot get root", e);
  95                 }
  96         }
  97
  98         @Override
  99         public String toString() {
 100                 if (path == null)
 101                         return "/";
 102                 StringBuilder sb = new StringBuilder();
 103                 if (isAbsolute())
 104                         sb.append('/');
 105                 for (int i = 0; i < path.length; i++) {
 106                         if (i != 0)
 107                                 sb.append('/');
 108                         sb.append(path[i]);
 109                 }
 110                 return sb.toString();
 111         }
 112
 113         public String toJcrPath() {
 114                 if (path == null)
 115                         return "/";
 116                 StringBuilder sb = new StringBuilder();
 117                 if (isAbsolute())
 118                         sb.append('/');
 119                 for (int i = 0; i < path.length; i++) {
 120                         if (i != 0)
 121                                 sb.append('/');
 122                         sb.append(Text.escapeIllegalJcrChars(path[i]));
 123                 }
 124                 return sb.toString();
 125         }
 126
 127         @Override
 128         public Path getFileName() {
 129                 if (path == null)
 130                         return null;
 131                 return new JcrPath(fs, path[path.length - 1]);
 132         }
 133
 134         @Override
 135         public Path getParent() {
 136                 if (path == null)
 137                         return null;
 138                 if (path.length == 1)// root
 139                         return new JcrPath(fs, delimStr);
 140                 String[] parentPath = Arrays.copyOfRange(path, 0, path.length - 1);
 141                 return new JcrPath(fs, parentPath, absolute);
 142         }
 143
 144         @Override
 145         public int getNameCount() {
 146                 if (path == null)
 147                         return 0;
 148                 return path.length;
 149         }
 150
 151         @Override
 152         public Path getName(int index) {
 153                 if (path == null)
 154                         return null;
 155                 return new JcrPath(fs, path[index]);
 156         }
 157
 158         @Override
 159         public Path subpath(int beginIndex, int endIndex) {
 160                 if (path == null)
 161                         return null;
 162                 String[] parentPath = Arrays.copyOfRange(path, beginIndex, endIndex);
 163                 return new JcrPath(fs, parentPath, false);
 164         }
 165
 166         @Override
 167         public boolean startsWith(Path other) {
 168                 return toString().startsWith(other.toString());
 169         }
 170
 171         @Override
 172         public boolean startsWith(String other) {
 173                 return toString().startsWith(other);
 174         }
 175
 176         @Override
 177         public boolean endsWith(Path other) {
 178                 return toString().endsWith(other.toString());
 179         }
 180
 181         @Override
 182         public boolean endsWith(String other) {
 183                 return toString().endsWith(other);
 184         }
 185
 186         @Override
 187         public Path normalize() {
 188                 // always normalized
 189                 return this;
 190         }
 191
 192         @Override
 193         public Path resolve(Path other) {
 194                 JcrPath otherPath = (JcrPath) other;
 195                 if (otherPath.isAbsolute())
 196                         return other;
 197                 String[] newPath;
 198                 if (path == null) {
 199                         newPath = new String[otherPath.path.length];
 200                         System.arraycopy(otherPath.path, 0, newPath, 0, otherPath.path.length);
 201                 } else {
 202                         newPath = new String[path.length + otherPath.path.length];
 203                         System.arraycopy(path, 0, newPath, 0, path.length);
 204                         System.arraycopy(otherPath.path, 0, newPath, path.length, otherPath.path.length);
 205                 }
 206                 return new JcrPath(fs, newPath, absolute);
 207         }
 208
 209         @Override
 210         public final Path resolve(String other) {
 211                 return resolve(getFileSystem().getPath(other));
 212         }
 213
 214         @Override
 215         public final Path resolveSibling(Path other) {
 216                 if (other == null)
 217                         throw new NullPointerException();
 218                 Path parent = getParent();
 219                 return (parent == null) ? other : parent.resolve(other);
 220         }
 221
 222         @Override
 223         public final Path resolveSibling(String other) {
 224                 return resolveSibling(getFileSystem().getPath(other));
 225         }
 226
 227         @Override
 228         public final Iterator<Path> iterator() {
 229                 return new Iterator<Path>() {
 230                         private int i = 0;
 231
 232                         @Override
 233                         public boolean hasNext() {
 234                                 return (i < getNameCount());
 235                         }
 236
 237                         @Override
 238                         public Path next() {
 239                                 if (i < getNameCount()) {
 240                                         Path result = getName(i);
 241                                         i++;
 242                                         return result;
 243                                 } else {
 244                                         throw new NoSuchElementException();
 245                                 }
 246                         }
 247
 248                         @Override
 249                         public void remove() {
 250                                 throw new UnsupportedOperationException();
 251                         }
 252                 };
 253         }
 254
 255         @Override
 256         public Path relativize(Path other) {
 257                 if (equals(other))
 258                         return new JcrPath(fs, "");
 259                 if (other.startsWith(this)) {
 260                         String p1 = toString();
 261                         String p2 = other.toString();
 262                         String relative = p2.substring(p1.length(), p2.length());
 263                         if (relative.charAt(0) == '/')
 264                                 relative = relative.substring(1);
 265                         return new JcrPath(fs, relative);
 266                 }
 267                 throw new IllegalArgumentException(other + " cannot be relativized against " + this);
 268         }
 269
 270         @Override
 271         public URI toUri() {
 272                 try {
 273                         return new URI(fs.provider().getScheme(), toString(), null);
 274                 } catch (URISyntaxException e) {
 275                         throw new JcrFsException("Cannot create URI for " + toString(), e);
 276                 }
 277         }
 278
 279         @Override
 280         public Path toAbsolutePath() {
 281                 if (isAbsolute())
 282                         return this;
 283                 return new JcrPath(fs, path, true);
 284         }
 285
 286         @Override
 287         public Path toRealPath(LinkOption... options) throws IOException {
 288                 return this;
 289         }
 290
 291         @Override
 292         public File toFile() {
 293                 throw new UnsupportedOperationException();
 294         }
 295
 296         @Override
 297         public WatchKey register(WatchService watcher, Kind<?>[] events, Modifier... modifiers) throws IOException {
 298                 // TODO Auto-generated method stub
 299                 return null;
 300         }
 301
 302         @Override
 303         public WatchKey register(WatchService watcher, Kind<?>... events) throws IOException {
 304                 // TODO Auto-generated method stub
 305                 return null;
 306         }
 307
 308         @Override
 309         public int compareTo(Path other) {
 310                 return toString().compareTo(other.toString());
 311         }
 312
 313         public Node getNode() throws RepositoryException {
 314                 if (!isAbsolute())// TODO default dir
 315                         throw new JcrFsException("Cannot get node from relative path");
 316                 String pathStr = toJcrPath();
 317                 Session session = fs.getSession();
 318                 // TODO synchronize on the session ?
 319                 if (!session.itemExists(pathStr))
 320                         return null;
 321                 return session.getNode(pathStr);
 322         }
 323
 324         @Override
 325         public boolean equals(Object obj) {
 326                 if (!(obj instanceof JcrPath))
 327                         return false;
 328                 JcrPath other = (JcrPath) obj;
 329
 330                 if (path == null) {// root
 331                         if (other.path == null)// root
 332                                 return true;
 333                         else
 334                                 return false;
 335                 } else {
 336                         if (other.path == null)// root
 337                                 return false;
 338                 }
 339                 // non root
 340                 if (path.length != other.path.length)
 341                         return false;
 342                 for (int i = 0; i < path.length; i++) {
 343                         if (!path[i].equals(other.path[i]))
 344                                 return false;
 345                 }
 346                 return true;
 347         }
 348
 349         @Override
 350         public int hashCode() {
 351                 return hashCode;
 352         }
 353
 354         @Override
 355         protected Object clone() throws CloneNotSupportedException {
 356                 return new JcrPath(fs, toString());
 357         }
 358
 359         @Override
 360         protected void finalize() throws Throwable {
 361                 Arrays.fill(path, null);
 362         }
 363
 364 }