Remove UI dependencies to JCR.

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

diff --git a/jcr/org.argeo.cms.jcr.ui/src/org/argeo/eclipse/ui/jcr/util/JcrFileProvider.java b/jcr/org.argeo.cms.jcr.ui/src/org/argeo/eclipse/ui/jcr/util/JcrFileProvider.java
new file mode 100644 (file)
index 0000000..c82e666
--- /dev/null
+++ b/jcr/org.argeo.cms.jcr.ui/src/org/argeo/eclipse/ui/jcr/util/JcrFileProvider.java
@@ -0,0 +1,129 @@
+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.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. Note that it might not be very
+ * reliable as long as we have not fixed login and multi repository issues that
+ * will be addressed in the next version.
+ * 
+ * NOTE: id used here is the real id of the JCR Node, not the JCR Path
+ * 
+ * Relies on common approach for JCR file handling implementation.
+ * 
+ */
+@SuppressWarnings("deprecation")
+public class JcrFileProvider implements FileProvider {
+
+       // private Object[] rootNodes;
+       private Node refNode;
+
+       /**
+        * Must be set in order for the provider to be able to get current session
+        * and thus have the ability to get the file node corresponding to a given
+        * file ID
+        * 
+        * @param refNode
+        */
+       public void setReferenceNode(Node refNode) {
+               // FIXME : this introduces some concurrency ISSUES.
+               this.refNode = refNode;
+       }
+
+       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);
+               }
+       }
+
+       /**
+        * Throws an exception if the node is not found in the current repository (a
+        * bit like a FileNotFoundException)
+        * 
+        * @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 = refNode.getSession().getNodeByIdentifier(fileId);
+
+                       // rootNodes: for (int j = 0; j < rootNodes.length; j++) {
+                       // // in case we have a classic JCR Node
+                       // if (rootNodes[j] instanceof Node) {
+                       // Node curNode = (Node) rootNodes[j];
+                       // if (result != null)
+                       // break rootNodes;
+                       // } // Case of a repository Node
+                       // else if (rootNodes[j] instanceof RepositoryNode) {
+                       // Object[] nodes = ((RepositoryNode) rootNodes[j])
+                       // .getChildren();
+                       // for (int i = 0; i < nodes.length; i++) {
+                       // Node node = (Node) nodes[i];
+                       // result = node.getSession().getNodeByIdentifier(fileId);
+                       // if (result != null)
+                       // break rootNodes;
+                       // }
+                       // }
+                       // }
+
+                       // Sanity checks
+                       if (result == null)
+                               throw new EclipseUiException("File node not found for ID" + fileId);
+
+                       Node child = null;
+
+                       boolean isValid = true;
+                       if (!result.isNodeType(NodeType.NT_FILE))
+                               // useless: mandatory child node
+                               // || !result.hasNode(Property.JCR_CONTENT))
+                               isValid = false;
+                       else {
+                               child = result.getNode(Property.JCR_CONTENT);
+                               if (!(child.isNodeType(NodeType.NT_RESOURCE) || child.hasProperty(Property.JCR_DATA)))
+                                       isValid = false;
+                       }
+
+                       if (!isValid)
+                               throw new EclipseUiException("ERROR: In the current implemented model, '" + NodeType.NT_FILE
+                                               + "' file node must have a child node named jcr:content "
+                                               + "that has a BINARY Property named jcr:data " + "where the actual data is stored");
+                       return child;
+
+               } catch (RepositoryException re) {
+                       throw new EclipseUiException("Erreur while getting file node of ID " + fileId, re);
+               }
+       }
+}