eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/view/CdmViewerUtilE4.java

   1 /**
   2 * Copyright (C) 2015 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.taxeditor.view;
  10
  11 import java.util.HashMap;
  12 import java.util.Map;
  13
  14 import org.eclipse.core.commands.Command;
  15 import org.eclipse.core.runtime.IConfigurationElement;
  16 import org.eclipse.core.runtime.IExtensionRegistry;
  17 import org.eclipse.core.runtime.Platform;
  18 import org.eclipse.e4.core.commands.ECommandService;
  19 import org.eclipse.e4.core.commands.EHandlerService;
  20 import org.eclipse.jface.viewers.TreeNode;
  21
  22 import eu.etaxonomy.cdm.persistence.dto.UuidAndTitleCache;
  23 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  24 import eu.etaxonomy.taxeditor.store.CdmStore;
  25
  26 /**
  27  * Scans eu.etaxonomy.taxeditor.store.cdmViewer extension point.
  28  * @author pplitzner
  29  * @date Jul 7, 2015
  30  *
  31  */
  32 public class CdmViewerUtilE4 {
  33
  34     /**
  35      * Returns a map of available commands to open the given input. Keys are the
  36      * command IDs and values are their string representations.
  37      *
  38      * @param input
  39      *            the object which should be handled by the available commands
  40      * @return a key-value map of available commands and their string
  41      *         representation
  42      */
  43     public static Map<Command, String> getAvailableViewers(Object input, ECommandService commandService,
  44             EHandlerService handlerService){
  45         Map<Command, String> commandViewerNameMap = new HashMap<>();
  46
  47         if(input!=null){
  48             //for generic UuidAndTitleCache objects try to load the object
  49             if (input instanceof UuidAndTitleCache){
  50                 UuidAndTitleCache uuidAndTitleCache = (UuidAndTitleCache)input;
  51                 input = CdmStore.getCommonService().find(uuidAndTitleCache.getType(), uuidAndTitleCache.getUuid());
  52             }
  53             //for tree nodes get the value resp. the object of the node
  54             else if (input instanceof TreeNode){
  55                 TreeNode treeNode = (TreeNode)input;
  56                 input = treeNode.getValue();
  57             }
  58
  59             IExtensionRegistry reg = Platform.getExtensionRegistry();
  60             IConfigurationElement[] extensions = reg
  61                     .getConfigurationElementsFor("eu.etaxonomy.taxeditor.store.cdmViewer"); //$NON-NLS-1$
  62             for (IConfigurationElement configElement : extensions) {
  63                 try {
  64                     if(configElement.getName().equals("viewCommandMapping")){ //$NON-NLS-1$
  65                         String commandId = configElement.getAttribute("commandId"); //$NON-NLS-1$
  66                         String viewerName = configElement.getAttribute("viewerName"); //$NON-NLS-1$
  67                         Class<?> selectionClass = Class.forName(configElement.getAttribute("selection")); //$NON-NLS-1$
  68                         if(selectionClass.isAssignableFrom(input.getClass())){
  69                             Command command = commandService.getCommand(commandId);
  70                             commandViewerNameMap.put(command, viewerName);
  71                         }
  72                     }
  73                 } catch (ClassNotFoundException e) {
  74                     MessagingUtils.error(CdmViewerChooser.class, "Could not initalize selection class element of cdmViewer extension", e); //$NON-NLS-1$
  75                 }
  76             }
  77         }
  78         return commandViewerNameMap;
  79     }
  80
  81 }