bundles/org.simantics.databoard/src/org/simantics/databoard/binding/impl/ObjectVariantBinding.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.impl;
  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.RecordBinding;
  20 import org.simantics.databoard.binding.UnionBinding;
  21 import org.simantics.databoard.binding.VariantBinding;
  22 import org.simantics.databoard.binding.error.BindingConstructionException;
  23 import org.simantics.databoard.binding.error.BindingException;
  24 import org.simantics.databoard.binding.factory.BindingRepository;
  25 import org.simantics.databoard.binding.reflection.BindingRequest;
  26 import org.simantics.databoard.binding.reflection.ClassBindingFactory;
  27 import org.simantics.databoard.binding.reflection.VoidBinding;
  28 import org.simantics.databoard.type.Datatype;
  29 import org.simantics.databoard.type.RecordType;
  30 import org.simantics.databoard.type.UnionType;
  31
  32 /**
  33  * ObjectVariantBinding binds VariantType and Object.class.
  34  * The implementation is immutable as Object.class is not a container, it is
  35  * a value. <p>
  36  *
  37  * ObjectVariantBinding understands many classes
  38  *   Collections: ArrayList, List, LinkedList, int[], .., other arrays [], Map, TreeMap, HashMap, Set, HashSet, TreeSet,
  39  *   Strings: String
  40  *   immutable primitives: Integer, Boolean, ...
  41  *   mutable primitives: MutableInteger, MutableBoolean, ...
  42  *   classes: Record-classes, Bean-Classes, Immutable-Classes
  43  *   <code>null</code> is bound to a void.
  44  *
  45  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  46  */
  47 public class ObjectVariantBinding  extends VariantBinding {
  48
  49         ClassBindingFactory bindingFactory;
  50         AdapterFactory adapterFactory;
  51
  52         public ObjectVariantBinding(ClassBindingFactory bindingFactory, AdapterFactory adapterFactory) {
  53                 this.bindingFactory = bindingFactory;
  54                 this.adapterFactory = adapterFactory;
  55         }
  56
  57         public ClassBindingFactory getBindingFactory() {
  58                 return bindingFactory;
  59         }
  60
  61         public BindingRepository getRepository() {
  62                 return bindingFactory.getRepository();
  63         }
  64
  65         @Override
  66         public Object create(Binding srcBinding, Object value) throws BindingException {
  67                 if (srcBinding instanceof VoidBinding) return null;
  68                 return value;
  69
  70 /*              try {
  71                         //Annotation[] annotations = new Annotation[ srcBinding.getComponentCount() ];
  72                         BindingRequest request = new BindingRequest( value.getClass() );
  73                         //request.componentBinding = srcBinding.getComponentCount()>0?srcBinding.getComponentBinding(0):null;
  74                         Binding dstBinding = bindingFactory.getBinding( request );
  75                         return adapterFactory.adapt(value, srcBinding, dstBinding);
  76                 } catch (BindingConstructionException e) {
  77                         throw new BindingException(e);
  78                 } catch (AdaptException e) {
  79                         throw new BindingException(e);
  80                 }*/
  81         }
  82
  83         @Override
  84         public Binding getContentBinding(Object variant) throws BindingException {
  85                 try {
  86                         if (variant==null) return VoidBinding.VOID_BINDING;
  87                         BindingRequest request = new BindingRequest(variant.getClass());
  88                         return bindingFactory.construct(request);
  89                 } catch (BindingConstructionException e) {
  90                         throw new BindingException(e);
  91                 }
  92         }
  93
  94         @Override
  95         public Datatype getContentType(Object variant) throws BindingException {
  96                 return getContentBinding(variant).type();
  97         }
  98
  99         @Override
 100         public Object getContent(Object variant, Binding binding)
 101         throws BindingException {
 102                 try {
 103                         Binding binding1 = getContentBinding(variant);
 104                         Object value1 = variant;
 105
 106                         Binding binding2 = binding;
 107                         Object value2 = adapterFactory.adapt(value1, binding1, binding2);
 108
 109                         return value2;
 110                 } catch (AdaptException e) {
 111                         throw new BindingException(e);
 112                 }
 113         }
 114
 115         @Override
 116         public Object getContent(Object variant)
 117         throws BindingException {
 118                 return variant;
 119         }
 120
 121         @Override
 122         public void setContent(Object variant, Binding binding, Object value)
 123         throws BindingException {
 124                 if (variant==value) return;
 125                 try {
 126                         Binding binding1 = getContentBinding(variant);
 127                         Datatype type1 = binding1.type();
 128
 129                         Binding binding2 = binding;
 130                         Datatype type2 = binding2.type();
 131
 132                         // New value cannot be assigned to Object from different data type
 133                         if (!type1.equals(type2)) {
 134                                 throw new BindingException("Cannot assign "+value.getClass()+" to "+variant.getClass());
 135                         }
 136
 137                         // Can only assing to union or record of previous type
 138                         if (type1 instanceof RecordType) {
 139                                 RecordType recordType = (RecordType) type1;
 140                                 int count = recordType.getComponentCount();
 141                                 RecordBinding rb1 = (RecordBinding) binding1;
 142                                 RecordBinding rb2 = (RecordBinding) binding2;
 143                                 Object resultValues[] = new Object[count];
 144                                 for (int i=0; i<count; i++) {
 145                                         Binding cb1 = rb1.componentBindings[i];
 146                                         Binding cb2 = rb2.componentBindings[i];
 147
 148                                         Object componentValue2 = rb2.getComponent(value, i);
 149                                         Object componentValue1 = adapterFactory.adapt(componentValue2, cb2, cb1);
 150                                         resultValues[i] = componentValue1;
 151                                 }
 152                                 rb1.setComponents(variant, resultValues);
 153                         } else if (type1 instanceof UnionType) {
 154                                 UnionBinding ub1 = (UnionBinding) binding1;
 155                                 UnionBinding ub2 = (UnionBinding) binding2;
 156                                 int tag = ub2.getTag(value);
 157                                 Binding cb1 = ub1.getComponentBindings()[tag];
 158                                 Binding cb2 = ub2.getComponentBindings()[tag];
 159
 160                                 Object componentValue2 = ub2.getValue(value);
 161                                 Object componentValue1 = adapterFactory.adapt(componentValue2, cb2, cb1);
 162
 163                                 ub1.setValue(variant, tag, componentValue1);
 164                         } else {
 165                                 throw new BindingException("Cannot assign "+value.getClass()+" to "+variant.getClass());
 166                         }
 167
 168                 } catch (AdaptException e) {
 169                         throw new BindingException(e);
 170                 }
 171
 172         }
 173
 174         @Override
 175         public void assertInstaceIsValid(Object obj, Set<Object> validInstances) throws BindingException {
 176                 getContentBinding(obj).assertInstaceIsValid(obj);
 177         }
 178
 179         @Override
 180         public boolean isInstance(Object obj) {
 181                 return true;
 182         }
 183
 184         @Override
 185         public boolean isImmutable() {
 186                 return true;
 187         }
 188
 189         @Override
 190         protected boolean baseEquals(Object obj) {
 191                 ObjectVariantBinding o = (ObjectVariantBinding)obj;
 192                 return super.baseEquals( obj ) && o.adapterFactory == adapterFactory && o.bindingFactory == bindingFactory;
 193         }
 194 }