JCR as an ACR backend

[lgpl/argeo-commons.git] / org.argeo.cms / src / org / argeo / cms / acr / fs / FsContentProvider.java

diff --git a/org.argeo.cms/src/org/argeo/cms/acr/fs/FsContentProvider.java b/org.argeo.cms/src/org/argeo/cms/acr/fs/FsContentProvider.java
index 99ed3a8ca61689c11d89f139aad9f2ad8984e5ff..65bdd343ef72b213289e982008f917940877c8c2 100644 (file)
--- a/org.argeo.cms/src/org/argeo/cms/acr/fs/FsContentProvider.java
+++ b/org.argeo.cms/src/org/argeo/cms/acr/fs/FsContentProvider.java
@@ -1,25 +1,77 @@
 package org.argeo.cms.acr.fs;
 
 import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.attribute.UserDefinedFileAttributeView;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
 
 import org.argeo.api.acr.Content;
 import org.argeo.api.acr.ContentResourceException;
+import org.argeo.api.acr.CrName;
+import org.argeo.api.acr.NamespaceUtils;
 import org.argeo.api.acr.spi.ContentProvider;
 import org.argeo.api.acr.spi.ProvidedSession;
 
+/** Access a file system as a {@link ContentProvider}. */
 public class FsContentProvider implements ContentProvider {
+       final static String XMLNS_ = "xmlns:";
+
        private final Path rootPath;
+       private final boolean isRoot;
+
+       private NavigableMap<String, String> prefixes = new TreeMap<>();
 
-       public FsContentProvider(Path rootPath) {
-               super();
+       public FsContentProvider(Path rootPath, boolean isRoot) {
                this.rootPath = rootPath;
+               this.isRoot = isRoot;
+               initNamespaces();
+       }
+
+       protected void initNamespaces() {
+               try {
+                       UserDefinedFileAttributeView udfav = Files.getFileAttributeView(rootPath,
+                                       UserDefinedFileAttributeView.class);
+                       for (String name : udfav.list()) {
+                               if (name.startsWith(XMLNS_)) {
+                                       ByteBuffer buf = ByteBuffer.allocate(udfav.size(name));
+                                       udfav.read(name, buf);
+                                       buf.flip();
+                                       String namespace = StandardCharsets.UTF_8.decode(buf).toString();
+                                       String prefix = name.substring(XMLNS_.length());
+                                       prefixes.put(prefix, namespace);
+                               }
+                       }
+
+                       // defaults
+                       addDefaultNamespace(udfav, CrName.CR_DEFAULT_PREFIX, CrName.CR_NAMESPACE_URI);
+                       addDefaultNamespace(udfav, "basic", CrName.CR_NAMESPACE_URI);
+                       addDefaultNamespace(udfav, "owner", CrName.CR_NAMESPACE_URI);
+                       addDefaultNamespace(udfav, "posix", CrName.CR_NAMESPACE_URI);
+               } catch (IOException e) {
+                       throw new RuntimeException("Cannot read namespaces from " + rootPath, e);
+               }
+
+       }
+
+       protected void addDefaultNamespace(UserDefinedFileAttributeView udfav, String prefix, String namespace)
+                       throws IOException {
+               if (!prefixes.containsKey(prefix)) {
+                       ByteBuffer bb = ByteBuffer.wrap(namespace.getBytes(StandardCharsets.UTF_8));
+                       int size = udfav.write(XMLNS_ + prefix, bb);
+                       prefixes.put(prefix, namespace);
+               }
        }
 
        boolean isRoot(Path path) {
                try {
-                       return Files.isSameFile(rootPath, path);
+                       return isRoot && Files.isSameFile(rootPath, path);
                } catch (IOException e) {
                        throw new ContentResourceException(e);
                }
@@ -29,4 +81,20 @@ public class FsContentProvider implements ContentProvider {
        public Content get(ProvidedSession session, String mountPath, String relativePath) {
                return new FsContent(session, this, rootPath.resolve(relativePath));
        }
+
+       /*
+        * NAMESPACE CONTEXT
+        */
+
+       @Override
+       public String getNamespaceURI(String prefix) {
+               return NamespaceUtils.getNamespaceURI((p) -> prefixes.get(p), prefix);
+       }
+
+       @Override
+       public Iterator<String> getPrefixes(String namespaceURI) {
+               return NamespaceUtils.getPrefixes((ns) -> prefixes.entrySet().stream().filter(e -> e.getValue().equals(ns))
+                               .map(Map.Entry::getKey).collect(Collectors.toUnmodifiableSet()), namespaceURI);
+       }
+
 }