bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/ContainerOptionalBinding.java

   1 /*******************************************************************************
   2  *  Copyright (c) 2010 Association for Decentralized Information Management in
   3  *  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.databoard.binding.mutable;
  13
  14 import org.simantics.databoard.binding.Binding;
  15 import org.simantics.databoard.binding.OptionalBinding;
  16 import org.simantics.databoard.binding.error.BindingException;
  17 import org.simantics.databoard.type.OptionalType;
  18
  19 /**
  20  * Binds OptionalType to ValueContainer
  21  *
  22  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  23  */
  24 public class ContainerOptionalBinding extends OptionalBinding {
  25
  26         public ContainerOptionalBinding(Binding componentBinding) {
  27                 super(componentBinding);
  28         }
  29
  30         public ContainerOptionalBinding(OptionalType type, Binding componentBinding) {
  31                 super(type, componentBinding);
  32         }
  33
  34         @Override
  35         public boolean hasValue(Object arg) {
  36                 return ((ValueContainer)arg).value != null;
  37         }
  38
  39         @Override
  40         public Object getValue(Object arg) {
  41                 return ((ValueContainer)arg).value;
  42         }
  43
  44         @Override
  45         public Object createNoValue() {
  46                 return new ValueContainer();
  47         }
  48
  49         @Override
  50         public Object createValue(Object value) throws BindingException {
  51                 ValueContainer result = new ValueContainer();
  52                 result.value = value;
  53                 return result;
  54         }
  55
  56         @Override
  57         public boolean isInstance(Object obj) {
  58                 return obj instanceof ValueContainer;
  59         }
  60
  61         @Override
  62         public void setValue(Object optional, Object componentValue)
  63         throws BindingException {
  64                 ((ValueContainer) optional).value = componentValue;
  65         }
  66
  67         @Override
  68         public void setNoValue(Object optional) throws BindingException {
  69                 ((ValueContainer) optional).value = null;
  70         }
  71 }
  72