--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2010 Association for Decentralized Information Management in\r
+ * Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.databoard.accessor.java;
+
+import java.lang.ref.SoftReference;\r
+import java.util.concurrent.Executor;\r
+\r
+import org.simantics.databoard.accessor.Accessor;\r
+import org.simantics.databoard.accessor.OptionalAccessor;\r
+import org.simantics.databoard.accessor.error.AccessorConstructionException;\r
+import org.simantics.databoard.accessor.error.AccessorException;\r
+import org.simantics.databoard.accessor.error.ReferenceException;\r
+import org.simantics.databoard.accessor.event.Event;\r
+import org.simantics.databoard.accessor.event.OptionalValueAssigned;\r
+import org.simantics.databoard.accessor.event.OptionalValueRemoved;\r
+import org.simantics.databoard.accessor.event.ValueAssigned;\r
+import org.simantics.databoard.accessor.impl.AccessorParams;\r
+import org.simantics.databoard.accessor.impl.ListenerEntry;\r
+import org.simantics.databoard.accessor.interestset.InterestSet;\r
+import org.simantics.databoard.accessor.interestset.OptionalInterestSet;\r
+import org.simantics.databoard.accessor.reference.ChildReference;\r
+import org.simantics.databoard.accessor.reference.ComponentReference;\r
+import org.simantics.databoard.accessor.reference.LabelReference;\r
+import org.simantics.databoard.adapter.AdaptException;\r
+import org.simantics.databoard.adapter.AdapterConstructionException;\r
+import org.simantics.databoard.binding.Binding;\r
+import org.simantics.databoard.binding.OptionalBinding;\r
+import org.simantics.databoard.binding.error.BindingException;\r
+import org.simantics.databoard.binding.mutable.MutableVariant;\r
+import org.simantics.databoard.type.OptionalType;\r
+
+public class JavaOptional extends JavaObject implements OptionalAccessor {
+
+ /** Accessor to component */
+ SoftReference<JavaObject> component;
+
+ public JavaOptional(Accessor parent, OptionalBinding binding, Object object, AccessorParams params) {
+ super(parent, binding, object, params);
+ }
+
+ @Override
+ public OptionalBinding getBinding() {
+ return (OptionalBinding) binding;
+ }
+
+ @Override
+ public OptionalType type() {
+ return (OptionalType) getBinding().type();
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public <T extends Accessor> T getComponentAccessor() throws AccessorConstructionException
+ {
+ try {
+ if (!getBinding().hasValue(object)) return null;
+
+ // Get existing or create new
+ JavaObject sa = getExistingAccessor();
+
+ if (sa==null) {
+ // Instantiate new accessor
+ Binding cb = getBinding().getComponentBinding();
+ Object cv = getBinding().getValue(object);
+
+ // Instantiate correct sub accessor.
+ sa = createSubAccessor(this, cb, cv, params);
+ component = new SoftReference<JavaObject>(sa);
+
+ // Add listener to component, if it is in our interest set
+ ListenerEntry le = listeners;
+ while (le!=null) {
+ OptionalInterestSet is = le.getInterestSet();
+ InterestSet cis = is.getComponentInterest();
+ if (cis != null) {
+ try {
+ ChildReference childPath = ChildReference.concatenate( le.path, new ComponentReference() );
+ sa.addListener(le.listener, cis, childPath, le.executor);
+ } catch (AccessorException e) {
+ throw new AccessorConstructionException(e);
+ }
+ }
+ le = le.next;
+ }
+ }
+
+ return (T) sa;
+ } catch (BindingException e) {
+ throw new AccessorConstructionException(e);
+ }
+ }
+
+ /**
+ * Get existing sub accessor
+ *
+ * @return sub-accessor or <code>null</code>
+ */
+ JavaObject getExistingAccessor()
+ {
+ // Get existing or create new
+ SoftReference<JavaObject> ref = component;
+ JavaObject accessor = (ref!=null)?(JavaObject)ref.get():null;
+ return accessor;
+ }
+
+ @Override
+ public Object getComponentValue(Binding componentBinding)
+ throws AccessorException { \r
+ readLock();
+ try {
+ if (!getBinding().hasValue(object))
+ throw new AccessorException("There is no component value");
+
+ Binding cb = getBinding().getComponentBinding();
+ Object cv = getBinding().getValue(object);
+ return adapt(cv, cb, componentBinding);
+ } catch (BindingException e) {
+ throw new AccessorException(e);
+ } catch (AdaptException e) {
+ throw new AccessorException(e);
+ } catch (AdapterConstructionException e) {\r
+ throw new AccessorException(e);\r
+ } finally {\r
+ readUnlock();\r
+ }
+ }
+
+ @Override
+ public void addListener(Listener listener, InterestSet interestSet,
+ ChildReference path, Executor executor) throws AccessorException {
+ super.addListener(listener, interestSet, path, executor);
+ OptionalInterestSet is = (OptionalInterestSet) interestSet;
+ InterestSet cis = is.getComponentInterest();
+ if (cis==null) return;
+ JavaObject sa = getExistingAccessor();
+ if (sa==null) return;
+ ChildReference childPath = ChildReference.concatenate( path, new ComponentReference() );
+ sa.addListener(listener, cis, childPath, executor);
+ }
+
+ @Override
+ public void removeListener(Listener listener) throws AccessorException {
+ ListenerEntry e = detachListener(listener);
+ if (e==null) return;
+ OptionalInterestSet is = (OptionalInterestSet) e.interestSet;
+
+ InterestSet cis = is.getComponentInterest();
+ if (cis==null) return;
+ JavaObject sa = getExistingAccessor();
+ if (sa==null) return;
+ sa.removeListener(listener);
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public <T extends Accessor> T getComponent(ChildReference reference) throws AccessorConstructionException {
+ if (reference==null) return (T) this;\r
+\r
+ if (reference instanceof LabelReference) {\r
+ LabelReference lr = (LabelReference) reference;\r
+ if (lr.label.equals("o")) {\r
+ Accessor result = getComponentAccessor();\r
+ if (reference.getChildReference() != null)\r
+ result = result.getComponent(reference.getChildReference());\r
+ return (T) result; \r
+ } \r
+ }\r
+
+ if (reference instanceof ComponentReference) {
+ Accessor result = getComponentAccessor();
+ if (reference.getChildReference() != null)
+ result = result.getComponent(reference.getChildReference());
+ return (T) result;
+ } \r
+
+ throw new ReferenceException(reference.getClass()+" is not a reference of OptionalType");
+ }
+
+ @Override
+ public void setValue(Binding binding, Object newValue) throws AccessorException {\r
+ writeLock();
+ try {
+ OptionalBinding rb = (OptionalBinding) binding;
+ Object rv = newValue;
+ boolean rvHasValue = rb.hasValue(newValue);
+
+ if (rvHasValue) {
+ Binding rcb = rb.getComponentBinding();
+ Object rcv = rb.getValue(rv);
+ setComponentValue(rcb, rcv);
+ } else {
+ setNoValue();
+ }
+
+ } catch (BindingException e) {
+ throw new AccessorException(e);
+ } finally {\r
+ writeUnlock();\r
+ }
+ }
+
+ @Override
+ public boolean hasValue() throws AccessorException {\r
+ readLock();
+ try {
+ return getBinding().hasValue(object);
+ } catch (BindingException e) {
+ throw new AccessorException(e);
+ } finally {\r
+ readUnlock();\r
+ }
+ }
+
+
+ @Override
+ public void setNoValue() throws AccessorException {\r
+ writeLock();
+ try {
+ boolean hadValue = getBinding().hasValue(object);
+ if (!hadValue) return;
+
+ // Write
+ getBinding().setNoValue(object);
+
+ // Disconnect sub-accessor
+ JavaObject sa = getExistingAccessor();
+ component = null;
+ // Notify about disconnection of sub-accessor
+ if (sa!=null) sa.invalidatedNotification();
+
+ // Notify Listeners
+ ListenerEntry le = listeners;
+ while (le!=null) {
+ OptionalInterestSet is = le.getInterestSet();
+ if (is.inNotifications()) {
+ OptionalValueRemoved e = new OptionalValueRemoved();
+ emitEvent(le, e);
+ }
+ le = le.next;
+ }
+
+ } catch (BindingException e) {
+ throw new AccessorException(e);
+ } finally {\r
+ writeUnlock();\r
+ }
+ }
+
+ @Override
+ public void setComponentValue(Binding binding, Object value)
+ throws AccessorException {\r
+ writeLock();
+ try {
+ Binding rcb = binding;
+ Object rcv = value;
+ boolean hadValue = getBinding().hasValue(object);
+
+ // Write to component
+ JavaObject sa = getExistingAccessor();
+ if (sa!=null) {
+ assert(hadValue);
+ sa.setValue(rcb, rcv);
+ return;
+ }
+
+ Binding lcb = getBinding().getComponentBinding();
+ Object lcv = adapt(rcv, rcb, lcb);
+
+ // Write
+ getBinding().setValue(object, lcv);
+
+ // Notify Listeners
+ ListenerEntry le = listeners;
+ while (le!=null) {
+ OptionalInterestSet is = le.getInterestSet();
+ if (is.inNotifications()) {
+ MutableVariant newComponentValue = null;
+ if (is.inValues()) newComponentValue = new MutableVariant(lcb, lcb.isImmutable() ? lcv : lcb.clone(lcv));
+ OptionalValueAssigned e = new OptionalValueAssigned(newComponentValue);
+ emitEvent(le, e);
+ }
+
+ // Attach component interest
+// if (is.getComponentInterest()!=null && getComponentAccessor()!=null) {
+// sa = getComponentAccessor();
+// }
+
+ le = le.next;
+ }
+
+ } catch (BindingException e) {
+ throw new AccessorException(e);
+ } catch (AdaptException e) {
+ throw new AccessorException(e);
+ } catch (AdapterConstructionException e) {\r
+ throw new AccessorException(e);\r
+ } finally {\r
+ writeUnlock();\r
+ }
+
+ }
+
+ @Override
+ Event applyLocal(Event e, boolean makeRollback) throws AccessorException {
+ try {
+ Event rollback = null;
+ if (makeRollback) {
+ OptionalBinding b = getBinding();
+ Binding cb = getBinding().getComponentBinding();
+ rollback = hasValue() ? new OptionalValueAssigned(cb, b.getValue(object)) : new OptionalValueRemoved();
+ }
+ if (e instanceof ValueAssigned) {\r
+ ValueAssigned va = (ValueAssigned) e;\r
+ setValue(va.newValue.getBinding(), va.newValue.getValue());\r
+ return rollback;\r
+ } else \r
+ if (e instanceof OptionalValueAssigned) {
+ OptionalValueAssigned oa = (OptionalValueAssigned) e;
+ if (oa.newValue==null) throw new AccessorException("Cannot apply field assignment event, the value is missing");
+ setComponentValue(oa.newValue.getBinding(), oa.newValue.getValue());
+ } else if (e instanceof OptionalValueRemoved) {
+ //OptionalValueRemoved or = (OptionalValueRemoved) e;
+ setNoValue();
+ } else throw new AccessorException("Unexpected event type "+e.getClass().getName()+" for an Optional Type");
+
+ return rollback;
+ } catch (BindingException be) {
+ throw new AccessorException( be );
+ }
+ }
+
+
+}
+
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