fill in a few more tests

compiler/src/main/cpp/capnpc-java.c++

@@ -918,7 +918,8 @@ private:
 
           spaces(indent), "  public ", type, ".Reader",
           " get", titleCase, "() {\n",
-          spaces(indent), "    throw new Error();\n",
+          spaces(indent), "    return ", type,
+          ".Reader.factory.fromStructReader(_reader.getPointerField(", offset,").getStruct());\n",
           spaces(indent), "  }\n", "\n"),
 
         kj::strTree(
@@ -927,14 +928,17 @@ private:
           spaces(indent), "    return !_builder.getPointerField(", offset, ").isNull();\n",
           spaces(indent), "  }\n",
           spaces(indent), "  public final ", type, ".Builder get", titleCase, "() {\n",
-          spaces(indent), "    throw new Error();\n",
+          spaces(indent), "    return ", type,
+          ".Builder.factory.fromStructBuilder(_builder.getPointerField(", offset, ").getStruct());\n",
           spaces(indent), "  }\n",
           spaces(indent), "  public final void set", titleCase, "(", type, ".Reader value) {\n",
           unionDiscrim.set,
           spaces(indent), "    throw new Error();\n",
           spaces(indent), "  }\n",
-          spaces(indent), "  public final ", type, ".Builder init", titleCase, "(int size) {\n",
+          spaces(indent), "  public final ", type, ".Builder init", titleCase, "() {\n",
-          spaces(indent), "    throw new Error();\n",
+          spaces(indent), "    return ",
+          type, ".Builder.factory.fromStructBuilder(_builder.getPointerField(", offset, ").initStruct(",
+          type, ".STRUCT_SIZE", "));\n",
           spaces(indent), "  }\n"),
 
         kj::strTree(),

compiler/src/test/scala/org/capnproto/TestUtil.scala

@@ -20,6 +20,22 @@ object TestUtil {
     builder.setFloat64Field(-123e45);
     builder.setTextField(new Text.Reader("foo"));
 //    builder.setDataField(data("bar"));
+    {
+      val subBuilder = builder.initStructField();
+      subBuilder.setVoidField(org.capnproto.Void.VOID);
+      subBuilder.setBoolField(true);
+      subBuilder.setInt8Field(-12);
+      subBuilder.setInt16Field(3456);
+      subBuilder.setInt32Field(-78901234);
+      subBuilder.setInt64Field(56789012345678L);
+      subBuilder.setUInt8Field(90);
+      subBuilder.setUInt16Field(1234);
+      subBuilder.setUInt32Field(56789012);
+      subBuilder.setUInt64Field(345678901234567890L);
+      subBuilder.setFloat32Field(-1.25e-10f);
+      subBuilder.setFloat64Field(345);
+      subBuilder.setTextField(new Text.Reader("baz"));
+    }
 
   }
 
@@ -38,6 +54,10 @@ object TestUtil {
     assert(builder.getFloat32Field() == 1234.5f);
     assert(builder.getFloat64Field() == -123e45);
     //assert(builder.getTextField().toString() == "foo");
+
+    {
+//      val subBuilder = builder.getStructField();
+    }
   }
 
 }

runtime/src/main/java/org/capnproto/PointerBuilder.java

@@ -17,6 +17,11 @@ public final class PointerBuilder {
         return this.segment.buffer.getLong(this.pointer) == 0;
     }
 
+    public final StructBuilder getStruct() {
+        throw new Error();
+//        return WireHelpers.getWritableStructPointer();
+    }
+
     public final StructBuilder initStruct(StructSize size) {
         return WireHelpers.initStructPointer(this.pointer, this.segment, size);
     }

runtime/src/main/java/org/capnproto/WireHelpers.java

@@ -34,6 +34,12 @@ final class WireHelpers {
                                  size.data * 64, size.pointers, (byte)0);
     }
 
+    public static StructBuilder getWritableStructPointer(int refOffset,
+                                                         SegmentBuilder segment,
+                                                         StructSize size) {
+        throw new Error("unimplemented");
+    }
+
     public static ListBuilder initListPointer(int refOffset,
                                               SegmentBuilder segment,
                                               int elementCount,