JcrBrowserUtils.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui.workbench.jcr.internal;
  17
  18 import javax.jcr.Node;
  19 import javax.jcr.RepositoryException;
  20
  21 import org.argeo.ArgeoException;
  22 import org.argeo.eclipse.ui.TreeParent;
  23 import org.argeo.eclipse.ui.workbench.jcr.internal.model.RepositoriesElem;
  24 import org.argeo.eclipse.ui.workbench.jcr.internal.model.RepositoryElem;
  25 import org.argeo.eclipse.ui.workbench.jcr.internal.model.SingleJcrNodeElem;
  26 import org.argeo.eclipse.ui.workbench.jcr.internal.model.WorkspaceElem;
  27
  28 /** Centralizes useful methods to manage the JCR Browser */
  29 public class JcrBrowserUtils {
  30
  31         /** Insure that the UI component is not stale, refresh if needed */
  32         public static void forceRefreshIfNeeded(TreeParent element) {
  33                 Node curNode = null;
  34
  35                 boolean doRefresh = false;
  36
  37                 try {
  38                         if (element instanceof SingleJcrNodeElem) {
  39                                 curNode = ((SingleJcrNodeElem) element).getNode();
  40                         } else if (element instanceof WorkspaceElem) {
  41                                 curNode = ((WorkspaceElem) element).getRootNode();
  42                         }
  43
  44                         if (curNode != null
  45                                         && element.getChildren().length != curNode.getNodes()
  46                                                         .getSize())
  47                                 doRefresh = true;
  48                         else if (element instanceof RepositoryElem) {
  49                                 RepositoryElem rn = (RepositoryElem) element;
  50                                 if (rn.isConnected()) {
  51                                         String[] wkpNames = rn.getAccessibleWorkspaceNames();
  52                                         if (element.getChildren().length != wkpNames.length)
  53                                                 doRefresh = true;
  54                                 }
  55                         } else if (element instanceof RepositoriesElem) {
  56                                 doRefresh = true;
  57                                 // Always force refresh for RepositoriesElem : the condition
  58                                 // below does not take remote repository into account and it is
  59                                 // not trivial to do so.
  60
  61                                 // RepositoriesElem rn = (RepositoriesElem) element;
  62                                 // if (element.getChildren().length !=
  63                                 // rn.getRepositoryRegister()
  64                                 // .getRepositories().size())
  65                                 // doRefresh = true;
  66                         }
  67                         if (doRefresh) {
  68                                 element.clearChildren();
  69                                 element.getChildren();
  70                         }
  71                 } catch (RepositoryException re) {
  72                         throw new ArgeoException(
  73                                         "Unexpected error while synchronising the UI with the JCR repository",
  74                                         re);
  75                 }
  76         }
  77 }