bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/impl/TextModifyListenerImpl.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2012 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  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.browsing.ui.swt.widgets.impl;
  13
  14 import org.eclipse.jface.viewers.ISelection;
  15 import org.eclipse.swt.widgets.Text;
  16 import org.simantics.db.WriteGraph;
  17 import org.simantics.db.common.request.WriteRequest;
  18 import org.simantics.db.exception.DatabaseException;
  19 import org.simantics.db.layer0.util.Layer0Utils;
  20 import org.simantics.db.management.ISessionContext;
  21 import org.simantics.utils.ReflectionUtils;
  22 import org.simantics.utils.ui.ISelectionUtils;
  23
  24 public abstract class TextModifyListenerImpl<T> implements TextModifyListener, Widget {
  25
  26         protected ISessionContext context;
  27         protected Object lastInput = null;
  28
  29         protected final Class<?> clazz;
  30
  31         public TextModifyListenerImpl() {
  32                 clazz = ReflectionUtils.getSingleParameterType(getClass());
  33         }
  34
  35         private Object getInputContents(Object input, Class<?> inputClass) {
  36                 if (inputClass.isInstance(input))
  37                         return input;
  38                 if (input instanceof ISelection)
  39                         return ISelectionUtils.filterSingleSelection(input, inputClass);
  40                 return null;
  41         }
  42
  43         @Override
  44         public void modifyText(TrackedModifyEvent e) {
  45
  46                 Text text = (Text)e.getWidget();
  47                 final String textValue = text.getText();
  48                 final Object input = lastInput;
  49
  50                 try {
  51                         context.getSession().syncRequest(new WriteRequest() {
  52
  53                                 @SuppressWarnings("unchecked")
  54                                 @Override
  55                                 public void perform(WriteGraph graph) throws DatabaseException {
  56                                         graph.markUndoPoint();
  57                                         if(clazz.isInstance(input)) {
  58                                                 applyText(graph, (T)input, textValue);
  59                                                 Layer0Utils.addCommentMetadata(graph, "Modified " + input.toString() + " to " + textValue);
  60                                         } else {
  61                                                 T single = (T)getInputContents(input, clazz);
  62                                                 if(single != null) {
  63                                                         applyText(graph, single, textValue);
  64                                                         Layer0Utils.addCommentMetadata(graph, "Modified " + single.toString() + " to " + textValue);
  65                                                 }
  66                                         }
  67
  68
  69                                 }
  70
  71                         });
  72                 } catch (DatabaseException e1) {
  73                         e1.printStackTrace();
  74                 }
  75         }
  76
  77         @Override
  78         public void setInput(ISessionContext context, Object parameter) {
  79                 this.context = context;
  80                 lastInput = parameter;
  81         }
  82
  83         abstract public void applyText(WriteGraph graph, T input, String text) throws DatabaseException;
  84
  85 }
  86