Move Eclipse components which are JCR specific.

[lgpl/argeo-commons.git] / org.argeo.cms.ui / src / org / argeo / eclipse / ui / jcr / util / SingleSessionFileProvider.java

diff --git a/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/SingleSessionFileProvider.java b/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/SingleSessionFileProvider.java
new file mode 100644 (file)
index 0000000..291d579
--- /dev/null
+++ b/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/SingleSessionFileProvider.java
@@ -0,0 +1,98 @@
+package org.argeo.eclipse.ui.jcr.util;
+
+import java.io.InputStream;
+
+import javax.jcr.Node;
+import javax.jcr.Property;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.jcr.nodetype.NodeType;
+
+import org.apache.commons.io.IOUtils;
+import org.argeo.eclipse.ui.EclipseUiException;
+import org.argeo.eclipse.ui.FileProvider;
+
+/**
+ * Implements a FileProvider for UI purposes. Unlike the
+ * <code> JcrFileProvider </code>, it relies on a single session and manages
+ * nodes with path only.
+ * 
+ * Note that considered id is the JCR path
+ * 
+ * Relies on common approach for JCR file handling implementation.
+ */
+@SuppressWarnings("deprecation")
+public class SingleSessionFileProvider implements FileProvider {
+
+       private Session session;
+
+       public SingleSessionFileProvider(Session session) {
+               this.session = session;
+       }
+
+       public byte[] getByteArrayFileFromId(String fileId) {
+               InputStream fis = null;
+               byte[] ba = null;
+               Node child = getFileNodeFromId(fileId);
+               try {
+                       fis = (InputStream) child.getProperty(Property.JCR_DATA)
+                                       .getBinary().getStream();
+                       ba = IOUtils.toByteArray(fis);
+
+               } catch (Exception e) {
+                       throw new EclipseUiException("Stream error while opening file", e);
+               } finally {
+                       IOUtils.closeQuietly(fis);
+               }
+               return ba;
+       }
+
+       public InputStream getInputStreamFromFileId(String fileId) {
+               try {
+                       InputStream fis = null;
+
+                       Node child = getFileNodeFromId(fileId);
+                       fis = (InputStream) child.getProperty(Property.JCR_DATA)
+                                       .getBinary().getStream();
+                       return fis;
+               } catch (RepositoryException re) {
+                       throw new EclipseUiException("Cannot get stream from file node for Id "
+                                       + fileId, re);
+               }
+       }
+
+       /**
+        * 
+        * @param fileId
+        * @return Returns the child node of the nt:file node. It is the child node
+        *         that have the jcr:data property where actual file is stored.
+        *         never null
+        */
+       private Node getFileNodeFromId(String fileId) {
+               try {
+                       Node result = null;
+                       result = session.getNode(fileId);
+
+                       // Sanity checks
+                       if (result == null)
+                               throw new EclipseUiException("File node not found for ID" + fileId);
+
+                       // Ensure that the node have the correct type.
+                       if (!result.isNodeType(NodeType.NT_FILE))
+                               throw new EclipseUiException(
+                                               "Cannot open file children Node that are not of "
+                                                               + NodeType.NT_RESOURCE + " type.");
+
+                       Node child = result.getNodes().nextNode();
+                       if (child == null || !child.isNodeType(NodeType.NT_RESOURCE))
+                               throw new EclipseUiException(
+                                               "ERROR: IN the current implemented model, "
+                                                               + NodeType.NT_FILE
+                                                               + "  file node must have one and only one child of the nt:ressource, where actual data is stored");
+                       return child;
+               } catch (RepositoryException re) {
+                       throw new EclipseUiException("Erreur while getting file node of ID "
+                                       + fileId, re);
+               }
+       }
+}