bundles/org.simantics.issues.ui/src/org/simantics/issues/ui/handler/Help.java

   1 /*******************************************************************************
   2  * Copyright (c) 2017 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     Semantum Oy - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.issues.ui.handler;
  13
  14 import org.eclipse.ui.PlatformUI;
  15 import org.simantics.Simantics;
  16 import org.simantics.databoard.Bindings;
  17 import org.simantics.databoard.binding.Binding;
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.common.request.TernaryRead;
  20 import org.simantics.db.common.utils.Logger;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.db.layer0.adapter.ActionFactory;
  23 import org.simantics.db.layer0.variable.Variable;
  24
  25 /**
  26  * @author Tuukka Lehtonen
  27  * @since 1.27.0
  28  */
  29 public class Help implements ActionFactory {
  30
  31         @Override
  32         public Runnable create(Object target) {
  33                 if (target instanceof Variable) {
  34                         return () -> {
  35                                 try {
  36                                         String id = Simantics.sync(new PossibleVariablePropertyValue<String>((Variable) target, "contextualHelpId", Bindings.STRING)); //$NON-NLS-1$
  37                                         if (id == null) {
  38                                                 PlatformUI.getWorkbench().getHelpSystem().displayDynamicHelp();
  39                                                 return;
  40                                         }
  41                                         PlatformUI.getWorkbench().getHelpSystem().displayHelp(id);
  42                                 } catch (DatabaseException e) {
  43                                         Logger.defaultLogError(e);
  44                                 }
  45                         };
  46                 }
  47
  48                 return null;
  49         }
  50
  51         static class PossibleVariablePropertyValue<T> extends TernaryRead<Variable, String, Binding, T> {
  52
  53                 public PossibleVariablePropertyValue(Variable variable, String property, Binding binding) {
  54                         super(variable, property, binding);
  55                 }
  56
  57                 @Override
  58                 public T perform(ReadGraph graph) throws DatabaseException {
  59                         return parameter.getPossiblePropertyValue(graph, parameter2, parameter3);
  60                 }
  61
  62         }
  63
  64 }