server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/utils/JcrFileProvider.java

   1 package org.argeo.jcr.ui.explorer.utils;
   2
   3 import java.io.InputStream;
   4 import java.util.ArrayList;
   5 import java.util.List;
   6 import java.util.Map;
   7
   8 import javax.jcr.Node;
   9 import javax.jcr.Property;
  10 import javax.jcr.Repository;
  11 import javax.jcr.RepositoryException;
  12 import javax.jcr.nodetype.NodeType;
  13
  14 import org.apache.commons.io.IOUtils;
  15 import org.argeo.ArgeoException;
  16 import org.argeo.eclipse.ui.specific.FileProvider;
  17 import org.argeo.jcr.RepositoryRegister;
  18 import org.argeo.jcr.ui.explorer.browser.RepositoryNode;
  19
  20 /**
  21  * Implements a FileProvider for UI purposes. Note that it might not be very
  22  * reliable as long as we have not fixed login & multi repository issues that
  23  * will be addressed in the next version.
  24  *
  25  * NOTE: id used here is the real id of the JCR Node, not the JCR Path
  26  *
  27  * Relies on common approach for JCR file handling implementation.
  28  *
  29  */
  30
  31 public class JcrFileProvider implements FileProvider {
  32
  33         private Object[] rootNodes;
  34
  35         /**
  36          * Must be set in order for the provider to be able to search the repository
  37          * Provided object might be either JCR Nodes or UI RepositoryNode for the
  38          * time being.
  39          *
  40          * @param repositoryNode
  41          */
  42         public void setRootNodes(Object[] rootNodes) {
  43                 List<Object> tmpNodes = new ArrayList<Object>();
  44                 for (int i = 0; i < rootNodes.length; i++) {
  45                         Object obj = rootNodes[i];
  46                         if (obj instanceof Node) {
  47                                 tmpNodes.add(obj);
  48                         } else if (obj instanceof RepositoryRegister) {
  49                                 RepositoryRegister repositoryRegister = (RepositoryRegister) obj;
  50                                 Map<String, Repository> repositories = repositoryRegister
  51                                                 .getRepositories();
  52                                 for (String name : repositories.keySet()) {
  53                                         tmpNodes.add(new RepositoryNode(name, repositories
  54                                                         .get(name)));
  55                                 }
  56
  57                         }
  58                 }
  59                 this.rootNodes = tmpNodes.toArray();
  60         }
  61
  62         public byte[] getByteArrayFileFromId(String fileId) {
  63                 InputStream fis = null;
  64                 byte[] ba = null;
  65                 Node child = getFileNodeFromId(fileId);
  66                 try {
  67                         fis = (InputStream) child.getProperty(Property.JCR_DATA)
  68                                         .getBinary().getStream();
  69                         ba = IOUtils.toByteArray(fis);
  70
  71                 } catch (Exception e) {
  72                         throw new ArgeoException("Stream error while opening file", e);
  73                 } finally {
  74                         IOUtils.closeQuietly(fis);
  75                 }
  76                 return ba;
  77         }
  78
  79         public InputStream getInputStreamFromFileId(String fileId) {
  80                 try {
  81                         InputStream fis = null;
  82
  83                         Node child = getFileNodeFromId(fileId);
  84                         fis = (InputStream) child.getProperty(Property.JCR_DATA)
  85                                         .getBinary().getStream();
  86                         return fis;
  87                 } catch (RepositoryException re) {
  88                         throw new ArgeoException("Cannot get stream from file node for Id "
  89                                         + fileId, re);
  90                 }
  91         }
  92
  93         /**
  94          * Throws an exception if the node is not found in the current repository (a
  95          * bit like a FileNotFoundException)
  96          *
  97          * @param fileId
  98          * @return Returns the child node of the nt:file node. It is the child node
  99          *         that have the jcr:data property where actual file is stored.
 100          *         never null
 101          */
 102         private Node getFileNodeFromId(String fileId) {
 103                 try {
 104                         Node result = null;
 105
 106                         rootNodes: for (int j = 0; j < rootNodes.length; j++) {
 107                                 // in case we have a classic JCR Node
 108                                 if (rootNodes[j] instanceof Node) {
 109                                         Node curNode = (Node) rootNodes[j];
 110                                         result = curNode.getSession().getNodeByIdentifier(fileId);
 111                                         if (result != null)
 112                                                 break rootNodes;
 113                                 } // Case of a repository Node
 114                                 else if (rootNodes[j] instanceof RepositoryNode) {
 115                                         Object[] nodes = ((RepositoryNode) rootNodes[j])
 116                                                         .getChildren();
 117                                         for (int i = 0; i < nodes.length; i++) {
 118                                                 Node node = (Node) nodes[i];
 119                                                 result = node.getSession().getNodeByIdentifier(fileId);
 120                                                 if (result != null)
 121                                                         break rootNodes;
 122                                         }
 123                                 }
 124                         }
 125
 126                         // Sanity checks
 127                         if (result == null)
 128                                 throw new ArgeoException("File node not found for ID" + fileId);
 129
 130                         // Ensure that the node have the correct type.
 131                         if (!result.isNodeType(NodeType.NT_FILE))
 132                                 throw new ArgeoException(
 133                                                 "Cannot open file children Node that are not of '"
 134                                                                 + NodeType.NT_RESOURCE + "' type.");
 135
 136                         // Get the usefull part of the Node
 137                         Node child = result.getNodes().nextNode();
 138                         if (child == null || !child.isNodeType(NodeType.NT_RESOURCE))
 139                                 throw new ArgeoException(
 140                                                 "ERROR: IN the current implemented model, '"
 141                                                                 + NodeType.NT_FILE
 142                                                                 + "' file node must have one and only one child of the nt:ressource, where actual data is stored");
 143                         return child;
 144
 145                 } catch (RepositoryException re) {
 146                         throw new ArgeoException("Erreur while getting file node of ID "
 147                                         + fileId, re);
 148                 }
 149         }
 150 }