Playground: add many-to-one examples

Author: agarciadom

mkdocs/docs/playground/examples/etl-many-to-one/after.emf

@@ -0,0 +1,11 @@
+@namespace(uri="psl", prefix="")
+package after;
+
+class Model {
+  val Element[*] instances;
+}
+
+class Element {
+  attr String name;
+  attr int[*] values;
+}

mkdocs/docs/playground/examples/etl-many-to-one/before.emf

@@ -0,0 +1,11 @@
+@namespace(uri="psl", prefix="")
+package before;
+
+class Model {
+  val Element[*] instances;
+}
+
+class Element {
+  attr String name;
+  attr int value;
+}

mkdocs/docs/playground/examples/etl-many-to-one/lazy-rule.etl

@@ -0,0 +1,25 @@
+rule M2M
+  transform s: Source!Model
+  to t: Target!Model
+{
+  var children = Map {};
+
+  for (inst in s.instances) {
+    if (children.containsKey(inst.name)) {
+      children.get(inst.name).values.add(inst.value);
+    } else {
+      var newInst = inst.equivalent();
+      t.instances.add(newInst);
+      children.put(inst.name, newInst);
+    }
+  }
+}
+
+@lazy
+rule A2A
+	transform s : Source!Element
+	to t : Target!Element
+{
+    t.name = s.name;
+	t.values.add(s.value);
+}

mkdocs/docs/playground/examples/etl-many-to-one/pre-block.etl

@@ -0,0 +1,29 @@
+pre {
+  var values = Map {};
+  for (a in Source!Element.all) {
+    if (values.containsKey(a.name)) {
+      a.~first = false;
+      values.get(a.name).add(a.value);
+    } else {
+      a.~first = true;
+      values.put(a.name, OrderedSet { a.value });
+    }
+  }
+}
+
+rule M2M
+  transform s: Source!Model
+  to t: Target!Model
+{
+  t.instances ::= s.instances;
+}
+
+rule A2A
+	transform s : Source!Element
+	to t : Target!Element
+{
+    guard: s.~first
+
+    t.name = s.name;
+	t.values = values.get(s.name);
+}

mkdocs/docs/playground/examples/etl-many-to-one/source.flexmi

@@ -0,0 +1,11 @@
+?nsuri: psl
+model:
+- instances:
+    - name: x
+    - value: 5
+- instances:
+    - name: x
+    - value: 3
+- instances:
+    - name: y
+    - value: 11

mkdocs/docs/playground/examples/examples.json

@@ -315,6 +315,24 @@
 				"flexmi": "callcentre/callcentre.flexmi",
 				"emfatic": "callcentre/callcentre.emf",
 				"secondEmfatic": "callcentre/minivoicexml.emf"
+			},
+			{
+				"id": "etl-many2one-pre",
+				"title": "Many to One (pre block)",
+				"language": "etl",
+				"program": "etl-many-to-one/pre-block.etl",
+				"flexmi": "etl-many-to-one/source.flexmi",
+				"emfatic": "etl-many-to-one/before.emf",
+				"secondEmfatic": "etl-many-to-one/after.emf"
+			},
+			{
+				"id": "etl-many2one-pre",
+				"title": "Many to One (lazy rule)",
+				"language": "etl",
+				"program": "etl-many-to-one/lazy-rule.etl",
+				"flexmi": "etl-many-to-one/source.flexmi",
+				"emfatic": "etl-many-to-one/before.emf",
+				"secondEmfatic": "etl-many-to-one/after.emf"
 			}
 		]
 	},