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