bundles/org.simantics.databoard/src/org/simantics/databoard/accessor/java/JavaByte.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.accessor.java;
  13
  14 import org.simantics.databoard.Bindings;
  15 import org.simantics.databoard.accessor.Accessor;
  16 import org.simantics.databoard.accessor.ByteAccessor;
  17 import org.simantics.databoard.accessor.error.AccessorConstructionException;
  18 import org.simantics.databoard.accessor.error.AccessorException;
  19 import org.simantics.databoard.accessor.error.ReferenceException;
  20 import org.simantics.databoard.accessor.event.Event;
  21 import org.simantics.databoard.accessor.event.ValueAssigned;
  22 import org.simantics.databoard.accessor.impl.AccessorParams;
  23 import org.simantics.databoard.accessor.impl.ListenerEntry;
  24 import org.simantics.databoard.accessor.interestset.ByteInterestSet;
  25 import org.simantics.databoard.accessor.reference.ChildReference;
  26 import org.simantics.databoard.binding.ArrayBinding;
  27 import org.simantics.databoard.binding.Binding;
  28 import org.simantics.databoard.binding.ByteBinding;
  29 import org.simantics.databoard.binding.RecordBinding;
  30 import org.simantics.databoard.binding.VariantBinding;
  31 import org.simantics.databoard.binding.error.BindingException;
  32 import org.simantics.databoard.type.ByteType;
  33
  34 /**
  35  * Accessor to a Java Object that contains a Byte Type.
  36  *
  37  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  38  */
  39 public class JavaByte extends JavaObject implements ByteAccessor {
  40
  41         public JavaByte(Accessor parent, ByteBinding binding, Object object, AccessorParams params) {
  42                 super(parent, binding, object, params);
  43         }
  44
  45         public ByteBinding getBinding() {
  46                 return (ByteBinding) binding;
  47         }
  48
  49         @Override
  50         public ByteType type() {
  51                 return getBinding().type();
  52         }
  53
  54         @Override
  55         public byte getValue() throws AccessorException {
  56                 readLock();
  57                 try {
  58                         return getBinding().getValue_(object);
  59                 } catch (BindingException e) {
  60                         throw new AccessorException(e);
  61                 } finally {
  62                         readUnlock();
  63                 }
  64         }
  65
  66         @Override
  67         public void setValue(byte newValue) throws AccessorException {
  68                 if (newValue == getValue()) return;
  69                 writeLock();
  70                 try {
  71                         if (binding.isImmutable() && parent!=null && parent instanceof JavaArray) {
  72                                 JavaObject jo = (JavaObject) parent;
  73                                 ArrayBinding ab = (ArrayBinding) jo.binding;
  74                                 Object nv = getBinding().create(newValue);
  75                                 ab.set(jo.object, (Integer)keyInParent, nv);
  76                                 this.object = nv;
  77                         } else if (binding.isImmutable() && parent!=null && parent instanceof JavaRecord) {
  78                                 JavaObject jo = (JavaObject) parent;
  79                                 RecordBinding rb = (RecordBinding) jo.binding;
  80                                 Object nv = getBinding().create(newValue);
  81                                 rb.setComponent(jo.object, (Integer)keyInParent, nv);
  82                                 this.object = nv;
  83                         } else if (binding.isImmutable() && parent!=null && parent instanceof JavaVariant) {
  84                                 JavaObject jo = (JavaObject) parent;
  85                                 VariantBinding vb = (VariantBinding) jo.binding;
  86                                 Object nv = getBinding().create(newValue);
  87                                 vb.setContent(jo.object, getBinding(), nv);
  88                                 this.object = nv;
  89                         } else {
  90                                 // Set value
  91                                 getBinding().setValue(object, newValue);
  92                         }
  93
  94
  95                         // Notify
  96                         ListenerEntry le = listeners;
  97                         while (le!=null) {
  98                                 ByteInterestSet is = le.getInterestSet();
  99                                 if (is.inNotifications()) {
 100                                         Event e = new ValueAssigned( Bindings.BYTE, is.inValues() ? newValue : null );
 101                                         emitEvent(le, e);
 102                                 }
 103                                 le = le.next;
 104                         }
 105
 106                 } catch (BindingException e) {
 107                         throw new AccessorException(e);
 108                 } finally {
 109                         writeUnlock();
 110                 }
 111         }
 112
 113         @Override
 114         public void setValue(Binding binding, Object newValue) throws AccessorException {
 115                 try {
 116                         byte nv = ((ByteBinding)binding).getValue_(newValue);
 117                         setValue(nv);
 118                 } catch (BindingException e) {
 119                         throw new AccessorException(e);
 120                 }
 121         }
 122
 123         @SuppressWarnings("unchecked")
 124         @Override
 125         public <T extends Accessor> T getComponent(ChildReference reference)
 126         throws AccessorConstructionException {
 127                 if (reference==null) return (T) this;
 128
 129                 throw new ReferenceException(reference.getClass()+" is not a subreference of BooleanType");
 130         }
 131
 132         @Override
 133         Event applyLocal(Event e, boolean makeRollback) throws AccessorException {
 134                 Event rollback = makeRollback ? new ValueAssigned( Bindings.BYTE, getValue() ) : null;
 135                 if (e instanceof ValueAssigned) {
 136                         ValueAssigned va = (ValueAssigned) e;
 137                         if (va.newValue == null) throw new AccessorException("Byte value expected, got null");
 138                         setValue(va.newValue.getBinding(), va.newValue.getValue());
 139                         return rollback;
 140                 } else {
 141                         throw new AccessorException("Cannot apply "+e.getClass().getName()+" to Byte");
 142                 }
 143         }
 144
 145 }
 146