org.argeo.cms/src/org/argeo/cms/acr/fs/FsContent.java

   1 package org.argeo.cms.acr.fs;
   2
   3 import java.io.IOException;
   4 import java.nio.ByteBuffer;
   5 import java.nio.charset.StandardCharsets;
   6 import java.nio.file.Files;
   7 import java.nio.file.Path;
   8 import java.nio.file.attribute.FileTime;
   9 import java.nio.file.attribute.UserDefinedFileAttributeView;
  10 import java.time.Instant;
  11 import java.util.Collections;
  12 import java.util.HashMap;
  13 import java.util.HashSet;
  14 import java.util.Iterator;
  15 import java.util.Map;
  16 import java.util.Optional;
  17 import java.util.Set;
  18
  19 import javax.xml.namespace.QName;
  20
  21 import org.argeo.api.acr.Content;
  22 import org.argeo.api.acr.ContentName;
  23 import org.argeo.api.acr.ContentResourceException;
  24 import org.argeo.api.acr.CrName;
  25 import org.argeo.api.acr.spi.AbstractContent;
  26 import org.argeo.api.acr.spi.ProvidedContent;
  27 import org.argeo.api.acr.spi.ProvidedSession;
  28 import org.argeo.util.FsUtils;
  29
  30 public class FsContent extends AbstractContent implements ProvidedContent {
  31         private final static String USER_ = "user:";
  32
  33         private static final Map<QName, String> BASIC_KEYS;
  34         private static final Map<QName, String> POSIX_KEYS;
  35         static {
  36                 BASIC_KEYS = new HashMap<>();
  37                 BASIC_KEYS.put(CrName.CREATION_TIME.get(), "basic:creationTime");
  38                 BASIC_KEYS.put(CrName.LAST_MODIFIED_TIME.get(), "basic:lastModifiedTime");
  39                 BASIC_KEYS.put(CrName.SIZE.get(), "basic:size");
  40                 BASIC_KEYS.put(CrName.FILE_KEY.get(), "basic:fileKey");
  41
  42                 POSIX_KEYS = new HashMap<>(BASIC_KEYS);
  43                 POSIX_KEYS.put(CrName.OWNER.get(), "owner:owner");
  44                 POSIX_KEYS.put(CrName.GROUP.get(), "posix:group");
  45                 POSIX_KEYS.put(CrName.PERMISSIONS.get(), "posix:permissions");
  46         }
  47
  48         private final ProvidedSession session;
  49         private final FsContentProvider provider;
  50         private final Path path;
  51         private final boolean isRoot;
  52         private final QName name;
  53
  54         protected FsContent(ProvidedSession session, FsContentProvider contentProvider, Path path) {
  55                 this.session = session;
  56                 this.provider = contentProvider;
  57                 this.path = path;
  58                 this.isRoot = contentProvider.isRoot(path);
  59                 // TODO check file names with ':' ?
  60                 if (isRoot)
  61                         this.name = CrName.ROOT.get();
  62                 else
  63                         this.name = session.parsePrefixedName(path.getFileName().toString());
  64         }
  65
  66         protected FsContent(FsContent context, Path path) {
  67                 this(context.getSession(), context.getProvider(), path);
  68         }
  69
  70         private boolean isPosix() {
  71                 return path.getFileSystem().supportedFileAttributeViews().contains("posix");
  72         }
  73
  74         @Override
  75         public QName getName() {
  76                 return name;
  77         }
  78
  79         /*
  80          * ATTRIBUTES
  81          */
  82
  83         @Override
  84         public <A> Optional<A> get(QName key, Class<A> clss) {
  85                 Object value;
  86                 try {
  87                         // We need to add user: when accessing via Files#getAttribute
  88                         value = Files.getAttribute(path, toFsAttributeKey(key));
  89                 } catch (IOException e) {
  90                         throw new ContentResourceException("Cannot retrieve attribute " + key + " for " + path, e);
  91                 }
  92                 A res = null;
  93                 if (value instanceof FileTime) {
  94                         if (clss.isAssignableFrom(FileTime.class))
  95                                 res = (A) value;
  96                         Instant instant = ((FileTime) value).toInstant();
  97                         if (Object.class.isAssignableFrom(clss)) {// plain object requested
  98                                 res = (A) instant;
  99                         }
 100                         // TODO perform trivial file conversion to other formats
 101                 }
 102                 if (value instanceof byte[]) {
 103                         res = (A) new String((byte[]) value, StandardCharsets.UTF_8);
 104                 }
 105                 if (res == null)
 106                         try {
 107                                 res = (A) value;
 108                         } catch (ClassCastException e) {
 109                                 return Optional.empty();
 110                         }
 111                 return Optional.of(res);
 112         }
 113
 114         @Override
 115         protected Iterable<QName> keys() {
 116                 Set<QName> result = new HashSet<>(isPosix() ? POSIX_KEYS.keySet() : BASIC_KEYS.keySet());
 117                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
 118                 if (udfav != null) {
 119                         try {
 120                                 for (String name : udfav.list()) {
 121                                         result.add(session.parsePrefixedName(name));
 122                                 }
 123                         } catch (IOException e) {
 124                                 throw new ContentResourceException("Cannot list attributes for " + path, e);
 125                         }
 126                 }
 127                 return result;
 128         }
 129
 130         @Override
 131         protected void removeAttr(QName key) {
 132                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
 133                 try {
 134                         udfav.delete(session.toPrefixedName(key));
 135                 } catch (IOException e) {
 136                         throw new ContentResourceException("Cannot delete attribute " + key + " for " + path, e);
 137                 }
 138         }
 139
 140         @Override
 141         public Object put(QName key, Object value) {
 142                 Object previous = get(key);
 143                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
 144                 ByteBuffer bb = ByteBuffer.wrap(value.toString().getBytes(StandardCharsets.UTF_8));
 145                 try {
 146                         int size = udfav.write(session.toPrefixedName(key), bb);
 147                 } catch (IOException e) {
 148                         throw new ContentResourceException("Cannot delete attribute " + key + " for " + path, e);
 149                 }
 150                 return previous;
 151         }
 152
 153         protected String toFsAttributeKey(QName key) {
 154                 if (POSIX_KEYS.containsKey(key))
 155                         return POSIX_KEYS.get(key);
 156                 else
 157                         return USER_ + session.toPrefixedName(key);
 158         }
 159
 160         /*
 161          * CONTENT OPERATIONS
 162          */
 163         @Override
 164         public Iterator<Content> iterator() {
 165                 if (Files.isDirectory(path)) {
 166                         try {
 167                                 return Files.list(path).map((p) -> (Content) new FsContent(this, p)).iterator();
 168                         } catch (IOException e) {
 169                                 throw new ContentResourceException("Cannot list " + path, e);
 170                         }
 171                 } else {
 172                         return Collections.emptyIterator();
 173                 }
 174         }
 175
 176         @Override
 177         public Content add(QName name, QName... classes) {
 178                 try {
 179                         Path newPath = path.resolve(session.toPrefixedName(name));
 180                         if (ContentName.contains(classes, CrName.COLLECTION.get()))
 181                                 Files.createDirectory(newPath);
 182                         else
 183                                 Files.createFile(newPath);
 184
 185 //              for(ContentClass clss:classes) {
 186 //                      Files.setAttribute(newPath, name, newPath, null)
 187 //              }
 188                         return new FsContent(this, newPath);
 189                 } catch (IOException e) {
 190                         throw new ContentResourceException("Cannot create new content", e);
 191                 }
 192         }
 193
 194         @Override
 195         public void remove() {
 196                 FsUtils.delete(path);
 197         }
 198
 199         @Override
 200         public Content getParent() {
 201                 if (isRoot)
 202                         return null;// TODO deal with mounts
 203                 return new FsContent(this, path.getParent());
 204         }
 205
 206         /*
 207          * ACCESSORS
 208          */
 209         @Override
 210         public ProvidedSession getSession() {
 211                 return session;
 212         }
 213
 214         @Override
 215         public FsContentProvider getProvider() {
 216                 return provider;
 217         }
 218
 219 }