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.Objects;
  15 import java.util.Set;
  16
  17 import org.simantics.databoard.adapter.AdaptException;
  18 import org.simantics.databoard.adapter.AdapterFactory;
  19 import org.simantics.databoard.binding.Binding;
  20 import org.simantics.databoard.binding.RecordBinding;
  21 import org.simantics.databoard.binding.UnionBinding;
  22 import org.simantics.databoard.binding.VariantBinding;
  23 import org.simantics.databoard.binding.error.BindingConstructionException;
  24 import org.simantics.databoard.binding.error.BindingException;
  25 import org.simantics.databoard.binding.factory.BindingRepository;
  26 import org.simantics.databoard.binding.reflection.BindingRequest;
  27 import org.simantics.databoard.binding.reflection.ClassBindingFactory;
  28 import org.simantics.databoard.binding.reflection.VoidBinding;
  29 import org.simantics.databoard.type.Datatype;
  30 import org.simantics.databoard.type.RecordType;
  31 import org.simantics.databoard.type.UnionType;
  32
  33 /**
  34  * ObjectVariantBinding binds VariantType and Object.class.
  35  * The implementation is immutable as Object.class is not a container, it is
  36  * a value. <p>
  37  *
  38  * ObjectVariantBinding understands many classes
  39  *   Collections: ArrayList, List, LinkedList, int[], .., other arrays [], Map, TreeMap, HashMap, Set, HashSet, TreeSet,
  40  *   Strings: String
  41  *   immutable primitives: Integer, Boolean, ...
  42  *   mutable primitives: MutableInteger, MutableBoolean, ...
  43  *   classes: Record-classes, Bean-Classes, Immutable-Classes
  44  *   <code>null</code> is bound to a void.
  45  *
  46  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  47  */
  48 public class ObjectVariantBinding  extends VariantBinding {
  49
  50         ClassBindingFactory bindingFactory;
  51         AdapterFactory adapterFactory;
  52
  53         public ObjectVariantBinding(ClassBindingFactory bindingFactory, AdapterFactory adapterFactory) {
  54                 this.bindingFactory = bindingFactory;
  55                 this.adapterFactory = adapterFactory;
  56         }
  57
  58         public ClassBindingFactory getBindingFactory() {
  59                 return bindingFactory;
  60         }
  61
  62         public BindingRepository getRepository() {
  63                 return bindingFactory.getRepository();
  64         }
  65
  66         @Override
  67         public Object create(Binding srcBinding, Object value) throws BindingException {
  68                 if (srcBinding instanceof VoidBinding) return null;
  69                 return value;
  70
  71 /*              try {
  72                         //Annotation[] annotations = new Annotation[ srcBinding.getComponentCount() ];
  73                         BindingRequest request = new BindingRequest( value.getClass() );
  74                         //request.componentBinding = srcBinding.getComponentCount()>0?srcBinding.getComponentBinding(0):null;
  75                         Binding dstBinding = bindingFactory.getBinding( request );
  76                         return adapterFactory.adapt(value, srcBinding, dstBinding);
  77                 } catch (BindingConstructionException e) {
  78                         throw new BindingException(e);
  79                 } catch (AdaptException e) {
  80                         throw new BindingException(e);
  81                 }*/
  82         }
  83
  84         @Override
  85         public Binding getContentBinding(Object variant) throws BindingException {
  86                 try {
  87                         if (variant==null) return VoidBinding.VOID_BINDING;
  88                         BindingRequest request = new BindingRequest(variant.getClass());
  89                         return bindingFactory.construct(request);
  90                 } catch (BindingConstructionException e) {
  91                         throw new BindingException(e);
  92                 }
  93         }
  94
  95         @Override
  96         public Datatype getContentType(Object variant) throws BindingException {
  97                 return getContentBinding(variant).type();
  98         }
  99
 100         @Override
 101         public Object getContent(Object variant, Binding binding)
 102         throws BindingException {
 103                 try {
 104                         Binding binding1 = getContentBinding(variant);
 105                         Object value1 = variant;
 106
 107                         Binding binding2 = binding;
 108                         Object value2 = adapterFactory.adapt(value1, binding1, binding2);
 109
 110                         return value2;
 111                 } catch (AdaptException e) {
 112                         throw new BindingException(e);
 113                 }
 114         }
 115
 116         @Override
 117         public Object getContent(Object variant)
 118         throws BindingException {
 119                 return variant;
 120         }
 121
 122         @Override
 123         public void setContent(Object variant, Binding binding, Object value)
 124         throws BindingException {
 125                 if (variant==value) return;
 126                 try {
 127                         Binding binding1 = getContentBinding(variant);
 128                         Datatype type1 = binding1.type();
 129
 130                         Binding binding2 = binding;
 131                         Datatype type2 = binding2.type();
 132
 133                         // New value cannot be assigned to Object from different data type
 134                         if (!type1.equals(type2)) {
 135                                 throw new BindingException("Cannot assign "+value.getClass()+" to "+variant.getClass());
 136                         }
 137
 138                         // Can only assing to union or record of previous type
 139                         if (type1 instanceof RecordType) {
 140                                 RecordType recordType = (RecordType) type1;
 141                                 int count = recordType.getComponentCount();
 142                                 RecordBinding rb1 = (RecordBinding) binding1;
 143                                 RecordBinding rb2 = (RecordBinding) binding2;
 144                                 Object resultValues[] = new Object[count];
 145                                 for (int i=0; i<count; i++) {
 146                                         Binding cb1 = rb1.componentBindings[i];
 147                                         Binding cb2 = rb2.componentBindings[i];
 148
 149                                         Object componentValue2 = rb2.getComponent(value, i);
 150                                         Object componentValue1 = adapterFactory.adapt(componentValue2, cb2, cb1);
 151                                         resultValues[i] = componentValue1;
 152                                 }
 153                                 rb1.setComponents(variant, resultValues);
 154                         } else if (type1 instanceof UnionType) {
 155                                 UnionBinding ub1 = (UnionBinding) binding1;
 156                                 UnionBinding ub2 = (UnionBinding) binding2;
 157                                 int tag = ub2.getTag(value);
 158                                 Binding cb1 = ub1.getComponentBindings()[tag];
 159                                 Binding cb2 = ub2.getComponentBindings()[tag];
 160
 161                                 Object componentValue2 = ub2.getValue(value);
 162                                 Object componentValue1 = adapterFactory.adapt(componentValue2, cb2, cb1);
 163
 164                                 ub1.setValue(variant, tag, componentValue1);
 165                         } else {
 166                                 throw new BindingException("Cannot assign "+value.getClass()+" to "+variant.getClass());
 167                         }
 168
 169                 } catch (AdaptException e) {
 170                         throw new BindingException(e);
 171                 }
 172
 173         }
 174
 175         @Override
 176         public void assertInstaceIsValid(Object obj, Set<Object> validInstances) throws BindingException {
 177                 getContentBinding(obj).assertInstaceIsValid(obj);
 178         }
 179
 180         @Override
 181         public boolean isInstance(Object obj) {
 182                 return true;
 183         }
 184
 185         @Override
 186         public boolean isImmutable() {
 187                 return true;
 188         }
 189
 190         @Override
 191         protected boolean baseEquals(Object obj) {
 192                 ObjectVariantBinding o = (ObjectVariantBinding)obj;
 193                 return super.baseEquals( obj ) && o.adapterFactory == adapterFactory && o.bindingFactory == bindingFactory;
 194         }
 195
 196         @Override
 197         public boolean equals(Object o1, Object o2) {
 198                 return Objects.equals(o1, o2);
 199         }
 200 }