bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/ImmutableVariantBinding.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 java.util.Set;
  15
  16 import org.simantics.databoard.adapter.AdaptException;
  17 import org.simantics.databoard.adapter.AdapterFactory;
  18 import org.simantics.databoard.binding.Binding;
  19 import org.simantics.databoard.binding.VariantBinding;
  20 import org.simantics.databoard.binding.error.BindingException;
  21 import org.simantics.databoard.binding.reflection.ClassBindingFactory;
  22 import org.simantics.databoard.type.Datatype;
  23
  24 /**
  25  * ImmutableVariantBinding binds VariantType to {@link Variant} Class.
  26  */
  27 public class ImmutableVariantBinding extends VariantBinding {
  28
  29         ClassBindingFactory bindingFactory;
  30         AdapterFactory adapterFactory;
  31
  32         public ImmutableVariantBinding(ClassBindingFactory bindingFactory, AdapterFactory adapterFactory) {
  33                 this.bindingFactory = bindingFactory;
  34                 this.adapterFactory = adapterFactory;
  35         }
  36
  37         @Override
  38         public boolean isImmutable() {
  39                 return true;
  40         }
  41
  42         @Override
  43         public Object create(Binding binding, Object value) throws BindingException {
  44                 return new Variant(binding, value);
  45         }
  46
  47         @Override
  48         public Binding getContentBinding(Object variant) throws BindingException {
  49                 Variant result = (Variant) variant;
  50                 return result.binding;
  51         }
  52
  53         @Override
  54         public Datatype getContentType(Object variant) throws BindingException {
  55                 Variant result = (Variant) variant;
  56                 return result.binding.type();
  57         }
  58
  59         @Override
  60         public Object getContent(Object variant, Binding binding) throws BindingException {
  61                 Variant var = (Variant) variant;
  62                 try {
  63                         Binding binding1 = var.binding;
  64                         Object value1 = var.value;
  65                         Binding binding2 = binding;
  66                         Object value2 = adapterFactory.adapt(value1, binding1, binding2);
  67                         return value2;
  68                 } catch (AdaptException e) {
  69                         throw new BindingException(e);
  70                 }
  71         }
  72
  73         public Object getContent(Object variant) throws BindingException {
  74                 Variant var = (Variant) variant;
  75                 return var.value;
  76         }
  77
  78         @Override
  79         public void setContent(Object variant, Binding binding, Object value)
  80                         throws BindingException {
  81                 Variant var = (Variant) variant;
  82                 if (var.binding == binding && var.value==value) return;
  83                 throw new BindingException("Cannot write to immutable variant");
  84         }
  85
  86         @Override
  87         public void assertInstaceIsValid(Object obj, Set<Object> validInstances) throws BindingException {
  88                 if (obj==null) throw new BindingException("null value is not Variant");
  89                 if (obj instanceof Variant == false) throw new BindingException("wrong class, Variant expected");
  90                 Variant var = (Variant) obj;
  91                 if (var.binding==null) throw new BindingException("Binding is expected");
  92                 var.binding.assertInstaceIsValid(var.value, validInstances);
  93         }
  94
  95         @Override
  96         public boolean isInstance(Object obj) {
  97                 if (obj==null) return false;
  98                 if (obj instanceof Variant == false) return false;
  99                 return true;
 100         }
 101
 102         boolean isValid(Binding binding, Object obj) throws BindingException {
 103                 binding.assertInstaceIsValid(obj);
 104                 return true;
 105         }
 106
 107         @Override
 108         public int baseHashCode() {
 109             return super.baseHashCode() + 7 * adapterFactory.hashCode() + 13 * bindingFactory.hashCode();
 110         }
 111
 112         @Override
 113         protected boolean baseEquals(Object obj) {
 114                 ImmutableVariantBinding o = (ImmutableVariantBinding)obj;
 115                 return super.baseEquals(obj) && o.adapterFactory == adapterFactory && o.bindingFactory == bindingFactory;
 116         }
 117 }