bundles/org.simantics.graphfile/src/org/simantics/graphfile/hack/GraphJavaFile.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2013 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.graphfile.hack;\r
  13 \r
  14 import java.io.File;\r
  15 import java.io.FileFilter;\r
  16 import java.io.FilenameFilter;\r
  17 import java.io.IOException;\r
  18 import java.net.MalformedURLException;\r
  19 import java.net.URI;\r
  20 import java.net.URL;\r
  21 \r
  22 import org.eclipse.core.runtime.IStatus;\r
  23 import org.eclipse.core.runtime.Status;\r
  24 import org.simantics.Simantics;\r
  25 import org.simantics.db.ReadGraph;\r
  26 import org.simantics.db.Resource;\r
  27 import org.simantics.db.Session;\r
  28 import org.simantics.db.WriteGraph;\r
  29 import org.simantics.db.common.request.WriteRequest;\r
  30 import org.simantics.db.exception.DatabaseException;\r
  31 import org.simantics.db.request.Read;\r
  32 import org.simantics.graphfile.Activator;\r
  33 import org.simantics.graphfile.ontology.GraphFileResource;\r
  34 import org.simantics.layer0.Layer0;\r
  35 \r
  36 /**\r
  37  * This is a wrapper for Graph based files. \r
  38  * \r
  39  * DO NOT USE this with File(Input/Output)Stream. \r
  40  * \r
  41  * @author Marko Luukkainen <marko.luukkainen@vtt.fi>\r
  42  *\r
  43  */\r
  44 public class GraphJavaFile extends File {\r
  45         \r
  46         private static final long serialVersionUID = 8213749101292672725L;\r
  47         private Session session;\r
  48         private Resource fileResource;\r
  49         \r
  50         public GraphJavaFile(Resource fileResource) {\r
  51                 super("");\r
  52                 this.fileResource = fileResource;\r
  53                 this.session = Simantics.getSession();\r
  54         }\r
  55         \r
  56         private byte[] getResourceData(ReadGraph graph) throws DatabaseException {\r
  57                 GraphFileResource gf = GraphFileResource.getInstance(graph);\r
  58                 return graph.getRelatedValue(fileResource, gf.HasFiledata);\r
  59         }\r
  60         \r
  61         private byte[] getResourceData() throws DatabaseException {\r
  62                 return Simantics.getSession().syncRequest(new Read<byte[]>() {\r
  63                         @Override\r
  64                         public byte[] perform(ReadGraph graph) throws DatabaseException {\r
  65                                 return getResourceData(graph);\r
  66                         }\r
  67                 });\r
  68         }\r
  69         \r
  70         @Override\r
  71         public boolean canExecute() {\r
  72                 return false;\r
  73         }\r
  74         \r
  75         @Override\r
  76         public boolean canRead() {\r
  77                 return false;\r
  78         }\r
  79         \r
  80         @Override\r
  81         public boolean canWrite() {\r
  82                 return false;\r
  83         }\r
  84         \r
  85         @Override\r
  86         public boolean createNewFile() throws IOException {\r
  87                 return false;\r
  88         }\r
  89         \r
  90         @Override\r
  91         public boolean delete() {\r
  92                 try {\r
  93                         session.syncRequest(new WriteRequest() {\r
  94                                 \r
  95                                 @Override\r
  96                                 public void perform(WriteGraph graph) throws DatabaseException {\r
  97                                         graph.deny(fileResource);\r
  98                                 }\r
  99                         });\r
 100                         return true;\r
 101                 } catch (DatabaseException e) {\r
 102                         Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, "Failed to delete file resource " + fileResource, e));\r
 103                         return false;\r
 104                 }\r
 105         }\r
 106         \r
 107         @Override\r
 108         public void deleteOnExit() {\r
 109                 \r
 110         }\r
 111         \r
 112         @Override\r
 113         public boolean equals(Object obj) {\r
 114                 if (obj == null)\r
 115                         return false;\r
 116                 if (!obj.getClass().equals(getClass()))\r
 117                         return false;\r
 118                 GraphJavaFile other = (GraphJavaFile)obj;\r
 119                 return fileResource.equals(other.fileResource);\r
 120         }\r
 121         \r
 122         @Override\r
 123         public File getAbsoluteFile() {\r
 124                 return this;\r
 125         }\r
 126         \r
 127         @Override\r
 128         public boolean exists() {\r
 129                 try {\r
 130                         return session.syncRequest(new Read<Boolean>() {\r
 131                                 @Override\r
 132                                 public Boolean perform(ReadGraph graph) throws DatabaseException {\r
 133                                         GraphFileResource gf = GraphFileResource.getInstance(graph);\r
 134                                         return graph.getPossibleRelatedValue(fileResource, gf.HasFiledata) != null;\r
 135                                 }\r
 136                         });\r
 137                 } catch (DatabaseException e) {\r
 138                         Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, "exists check failed for file resource " + fileResource, e));\r
 139                         return false;\r
 140                 }\r
 141         }\r
 142         \r
 143         @Override\r
 144         public String getAbsolutePath() {\r
 145                 return null;\r
 146         }\r
 147         \r
 148         @Override\r
 149         public File getCanonicalFile() throws IOException {\r
 150                 return this;\r
 151         }\r
 152         \r
 153         @Override\r
 154         public String getCanonicalPath() throws IOException {\r
 155                 return null;\r
 156         }\r
 157         \r
 158         @Override\r
 159         public long getFreeSpace() {\r
 160                 return 0;\r
 161         }\r
 162         \r
 163         @Override\r
 164         public String getName() {\r
 165                 try {\r
 166                         return Simantics.getSession().syncRequest(new Read<String>() {\r
 167                                 @Override\r
 168                                 public String perform(ReadGraph graph) throws DatabaseException {\r
 169                                         Layer0 l0 = Layer0.getInstance(graph);\r
 170                                         return graph.getRelatedValue(fileResource, l0.HasName);\r
 171                                 }\r
 172                         });\r
 173                 } catch (DatabaseException e) {\r
 174                         Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, "getName failed for file resource " + fileResource, e));\r
 175                         return e.getMessage();\r
 176                 }\r
 177         }\r
 178         \r
 179         @Override\r
 180         public String getParent() {\r
 181                 return null;\r
 182         }\r
 183         \r
 184         @Override\r
 185         public File getParentFile() {\r
 186                 return null;\r
 187         }\r
 188         \r
 189         @Override\r
 190         public String getPath() {\r
 191                 return null;\r
 192         }\r
 193         \r
 194         @Override\r
 195         public long getTotalSpace() {\r
 196                 return 0;\r
 197         }\r
 198         \r
 199         @Override\r
 200         public long getUsableSpace() {\r
 201                 return 0;\r
 202         }\r
 203         \r
 204         @Override\r
 205         public boolean isAbsolute() {\r
 206                 return false;\r
 207         }\r
 208         \r
 209         @Override\r
 210         public boolean isDirectory() {\r
 211                 return false;\r
 212         }\r
 213         \r
 214         @Override\r
 215         public boolean isFile() {\r
 216                 return true;\r
 217         }\r
 218         \r
 219         @Override\r
 220         public int hashCode() {\r
 221                 return fileResource.hashCode();\r
 222         }\r
 223         \r
 224         @Override\r
 225         public boolean isHidden() {\r
 226                 return false;\r
 227         }\r
 228         \r
 229         @Override\r
 230         public long lastModified() {\r
 231                 try {\r
 232                         return Simantics.getSession().syncRequest(new Read<Long>() {\r
 233                                 @Override\r
 234                                 public Long perform(ReadGraph graph) throws DatabaseException {\r
 235                                         GraphFileResource gf = GraphFileResource.getInstance(graph);\r
 236                                         return graph.getRelatedValue(fileResource, gf.LastModified);\r
 237                                 }\r
 238                         });\r
 239                 } catch (DatabaseException e) {\r
 240                         return 0;\r
 241                 }\r
 242         }\r
 243         \r
 244         @Override\r
 245         public long length() {\r
 246                 try {\r
 247                         return getResourceData().length;\r
 248                 } catch (DatabaseException e) {\r
 249                         return 0;\r
 250                 }\r
 251         }\r
 252         \r
 253         @Override\r
 254         public boolean mkdir() {\r
 255                 return false;\r
 256         }\r
 257         \r
 258         @Override\r
 259         public boolean mkdirs() {\r
 260                 return false;\r
 261         }\r
 262         \r
 263         @Override\r
 264         public boolean renameTo(File dest) {\r
 265                 return false;\r
 266         }\r
 267         \r
 268         @Override\r
 269         public boolean setReadable(boolean readable) {\r
 270                 return false;\r
 271         }\r
 272         \r
 273         @Override\r
 274         public boolean setReadable(boolean readable, boolean ownerOnly) {\r
 275                 return false;\r
 276         }\r
 277         \r
 278         @Override\r
 279         public boolean setWritable(boolean writable) {\r
 280                 return false;\r
 281         }\r
 282         \r
 283         @Override\r
 284         public boolean setWritable(boolean writable, boolean ownerOnly) {\r
 285                 return false;\r
 286         }\r
 287         \r
 288         @Override\r
 289         public boolean setExecutable(boolean executable) {\r
 290                 return false;\r
 291         }\r
 292         \r
 293         @Override\r
 294         public boolean setExecutable(boolean executable, boolean ownerOnly) {\r
 295                 return false;\r
 296         }\r
 297         \r
 298         @Override\r
 299         public boolean setLastModified(long time) {\r
 300                 return false;\r
 301         }\r
 302         \r
 303         @Override\r
 304         public String[] list() {\r
 305                 return null;\r
 306         }\r
 307         \r
 308         @Override\r
 309         public String[] list(FilenameFilter filter) {\r
 310                 return null;\r
 311         }\r
 312         \r
 313         @Override\r
 314         public File[] listFiles() {\r
 315                 return null;\r
 316         }\r
 317         \r
 318         @Override\r
 319         public File[] listFiles(FileFilter filter) {\r
 320                 return null;\r
 321         }\r
 322         \r
 323         @Override\r
 324         public File[] listFiles(FilenameFilter filter) {\r
 325                 return null;\r
 326         }\r
 327         \r
 328         @Override\r
 329         public boolean setReadOnly() {\r
 330                 return false;\r
 331         }\r
 332         \r
 333         @Override\r
 334         public String toString() {\r
 335                 return getName();\r
 336         }\r
 337         \r
 338         @Override\r
 339         public URL toURL() throws MalformedURLException {\r
 340                 return null;\r
 341         }\r
 342         \r
 343         @Override\r
 344         public URI toURI() {\r
 345                 return null;\r
 346         }\r
 347         \r
 348         \r
 349 \r
 350 }\r