MAJOR: process: use context single document to to resolve lookup cont…

…ext values

i.e. when resolving context variables if not found we shall fallback to
context document

#142

src/main/java/de/metas/ui/web/process/adprocess/ADProcessInstanceController.java

@@ -11,6 +11,7 @@
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
+import java.util.function.Function;
 
 import org.adempiere.ad.dao.IQueryBL;
 import org.adempiere.ad.dao.IQueryFilter;
@@ -58,10 +59,12 @@
 import de.metas.ui.web.window.datatypes.json.JSONDocumentChangedEvent;
 import de.metas.ui.web.window.model.Document;
 import de.metas.ui.web.window.model.Document.CopyMode;
+import de.metas.ui.web.window.model.DocumentCollection;
 import de.metas.ui.web.window.model.DocumentSaveStatus;
 import de.metas.ui.web.window.model.IDocumentChangesCollector;
 import de.metas.ui.web.window.model.IDocumentChangesCollector.ReasonSupplier;
 import de.metas.ui.web.window.model.IDocumentFieldView;
+import de.metas.ui.web.window.model.NullDocumentChangesCollector;
 
 /*
  * #%L
@@ -109,6 +112,8 @@ public static final Builder builder()
 	private final IViewsRepository viewsRepo;
 	private final ViewId viewId;
 	private final DocumentIdsSelection viewSelectedDocumentIds;
+
+	private final DocumentPath contextSingleDocumentPath;
 
 	private boolean executed = false;
 	private ProcessInstanceResult executionResult;
@@ -126,6 +131,8 @@ private ADProcessInstanceController(final Builder builder)
 		viewsRepo = builder.viewsRepo;
 		viewId = builder.viewId;
 		viewSelectedDocumentIds = builder.viewSelectedDocumentIds == null ? DocumentIdsSelection.EMPTY : builder.viewSelectedDocumentIds;
+
+		contextSingleDocumentPath = builder.contextSingleDocumentPath;
 
 		executed = false;
 		executionResult = null;
@@ -147,6 +154,8 @@ private ADProcessInstanceController(final ADProcessInstanceController from, fina
 		viewsRepo = from.viewsRepo;
 		viewId = from.viewId;
 		viewSelectedDocumentIds = from.viewSelectedDocumentIds;
+
+		contextSingleDocumentPath = from.contextSingleDocumentPath;
 
 		executed = from.executed;
 		executionResult = from.executionResult;
@@ -192,6 +201,19 @@ public ADProcessInstanceController copy(final CopyMode copyMode, final IDocument
 	{
 		return new ADProcessInstanceController(this, copyMode, changesCollector);
 	}
+
+	public ADProcessInstanceController bindContextSingleDocument(final DocumentCollection documentsCollection)
+	{
+		if(contextSingleDocumentPath == null)
+		{
+			return this;
+		}
+
+		final Document contextSingleDocument = documentsCollection.forDocumentReadonly(contextSingleDocumentPath, NullDocumentChangesCollector.instance, Function.identity());
+		getParametersDocument().setShadowParentDocumentEvaluatee(contextSingleDocument.asEvaluatee());
+
+		return this;
+	}
 
 	public IAutoCloseable activate()
 	{
@@ -263,7 +285,7 @@ public ProcessInstanceResult startProcess(final IViewsRepository viewsRepo)
 		return executionResult;
 	}
 
-	private static final ProcessInstanceResult executeADProcess(final DocumentId adPInstanceId, final ProcessDescriptor processDescriptor, IViewsRepository viewsRepo)
+	private static final ProcessInstanceResult executeADProcess(final DocumentId adPInstanceId, final ProcessDescriptor processDescriptor, final IViewsRepository viewsRepo)
 	{
 		//
 		// Create the process info and execute the process synchronously
@@ -551,7 +573,11 @@ public static class Builder
 		private IViewsRepository viewsRepo;
 		private ViewId viewId;
 		private DocumentIdsSelection viewSelectedDocumentIds;
+
 		private Object processClassInstance;
+
+		private DocumentPath contextSingleDocumentPath;
+
 
 		private Builder()
 		{
@@ -594,11 +620,17 @@ public Builder setView(final ViewId viewId, final DocumentIdsSelection selectedD
 			return this;
 		}
 
-		public Builder setProcessClassInstance(Object processClassInstance)
+		public Builder setProcessClassInstance(final Object processClassInstance)
 		{
 			this.processClassInstance = processClassInstance;
 			return this;
 		}
+
+		public Builder setContextSingleDocumentPath(final DocumentPath contextSingleDocumentPath)
+		{
+			this.contextSingleDocumentPath = contextSingleDocumentPath;
+			return this;
+		}
 	}
 
 }

src/main/java/de/metas/ui/web/process/adprocess/ADProcessInstancesRepository.java

@@ -185,6 +185,7 @@ private IProcessInstanceController createNewProcessInstance0(
 					.setViewsRepo(viewsRepo)
 					.setView(request.getViewId(), request.getViewDocumentIds())
 					.setProcessClassInstance(processClassInstance)
+					.setContextSingleDocumentPath(request.getSingleDocumentPath())
 					.build();
 			processInstances.put(adPInstanceId, pinstance.copy(CopyMode.CheckInReadonly, NullDocumentChangesCollector.instance));
 			return pinstance;
@@ -212,7 +213,7 @@ private ProcessInfo createProcessInfo(@NonNull final CreateProcessInstanceReques
 			{
 				final DocumentId viewSingleDocumentId = viewDocumentIds.getSingleDocumentId();
 				final TableRecordReference recordRef = view.getTableRecordReferenceOrNull(viewSingleDocumentId);
-				if(recordRef != null)
+				if (recordRef != null)
 				{
 					tableName = recordRef.getTableName();
 					recordId = recordRef.getRecord_ID();
@@ -230,7 +231,7 @@ private ProcessInfo createProcessInfo(@NonNull final CreateProcessInstanceReques
 			}
 
 			//
-			if(viewDocumentIds.isEmpty())
+			if (viewDocumentIds.isEmpty())
 			{
 				sqlWhereClause = null;
 			}
@@ -343,7 +344,8 @@ public <R> R forProcessInstanceReadonly(final DocumentId pinstanceId, final Func
 	{
 		try (final IAutoCloseable readLock = getOrLoad(pinstanceId).lockForReading())
 		{
-			final ADProcessInstanceController processInstance = getOrLoad(pinstanceId);
+			final ADProcessInstanceController processInstance = getOrLoad(pinstanceId).copy(CopyMode.CheckInReadonly, NullDocumentChangesCollector.instance)
+					.bindContextSingleDocument(documentsCollection);
 			try (final IAutoCloseable c = processInstance.activate())
 			{
 				return processor.apply(processInstance);
@@ -368,7 +370,8 @@ public <R> R forProcessInstanceWritable(final DocumentId pinstanceId, final IDoc
 	{
 		try (final IAutoCloseable writeLock = getOrLoad(pinstanceId).lockForWriting())
 		{
-			final ADProcessInstanceController processInstance = getOrLoad(pinstanceId).copy(CopyMode.CheckOutWritable, changesCollector);
+			final ADProcessInstanceController processInstance = getOrLoad(pinstanceId).copy(CopyMode.CheckOutWritable, changesCollector)
+					.bindContextSingleDocument(documentsCollection);
 
 			// Make sure the process was not already executed.
 			// If it was executed we are not allowed to change it.