Add list_as() Fix bind. (#267)

Author: blackwinter

README.md

@@ -678,6 +678,10 @@ do list(path: "<sourceField>", "var": "<variableName>")
 end
 ```
 
+#### `do list_as`
+
+TODO
+
 #### `do once`
 
 Executes the statements only once (when the bind is first encountered), not repeatedly for each record.

metafix/src/main/java/org/metafacture/metafix/FixBind.java

@@ -60,6 +60,34 @@ public void execute(final Metafix metafix, final Record record, final List<Strin
         }
     },
 
+    list_as {
+        @Override
+        public void execute(final Metafix metafix, final Record record, final List<String> params, final Map<String, String> options, final RecordTransformer recordTransformer) {
+            final Map<String, Value.Array> lists = new HashMap<>();
+            options.forEach((k, v) -> Value.asList(record.get(v), a -> lists.put(k, a)));
+
+            final int size = lists.values().stream().mapToInt(a -> a.size()).max().orElse(0);
+            for (int i = 0; i < size; ++i) {
+                final int index = i;
+
+                lists.forEach((k, v) -> {
+                    final Value value = index < v.size() ? v.get(index) : null;
+
+                    if (value != null) {
+                        record.put(k, v.get(index));
+                    }
+                    else {
+                        record.remove(k);
+                    }
+                });
+
+                recordTransformer.transform(record);
+            }
+
+            lists.keySet().forEach(record::remove);
+        }
+    },
+
     once {
         private final Map<Metafix, Set<String>> executed = new HashMap<>();
 

metafix/src/test/java/org/metafacture/metafix/MetafixBindTest.java

@@ -744,6 +744,43 @@ public void shouldPerformComplexOperationWithPathWildcard() {
         );
     }
 
+    @Test
+    public void shouldDoListAs() {
+        MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
+                "set_array('sourceOrga[]')",
+                "do list_as(orgId: 'ccm:university[]', orgName: 'ccm:university_DISPLAYNAME[]')",
+                "  copy_field(orgId, 'sourceOrga[].$append.id')",
+                "  copy_field(orgName, 'sourceOrga[].$last.name')",
+                "end"
+            ),
+            i -> {
+                i.startRecord("1");
+                i.startEntity("ccm:university[]");
+                i.literal("1", "https://ror.org/0304hq317");
+                i.endEntity();
+                i.startEntity("ccm:university_DISPLAYNAME[]");
+                i.literal("1", "Gottfried Wilhelm Leibniz Universität Hannover");
+                i.endEntity();
+                i.endRecord();
+            },
+            (o, f) -> {
+                o.get().startRecord("1");
+                o.get().startEntity("ccm:university[]");
+                o.get().literal("1", "https://ror.org/0304hq317");
+                o.get().endEntity();
+                o.get().startEntity("ccm:university_DISPLAYNAME[]");
+                o.get().literal("1", "Gottfried Wilhelm Leibniz Universität Hannover");
+                o.get().endEntity();
+                o.get().startEntity("sourceOrga[]");
+                o.get().startEntity("1");
+                o.get().literal("id", "https://ror.org/0304hq317");
+                o.get().literal("name", "Gottfried Wilhelm Leibniz Universität Hannover");
+                f.apply(2).endEntity();
+                o.get().endRecord();
+            }
+        );
+    }
+
     @Test
     public void shouldExecuteOnlyOnce() {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(