Generalise the ObjectGeneration stuff

The new ObjectGeneration stuff is now used to generate everything for a test
case, which means it's all unified and "nice" now.

Add a @UseGenerator annotation to be used to specify how to generate specific
field values.

Obviously, not everything can be generated magically, so if you specify a
@DataSource in your test then it will be used in preference to any magically
generated value.

2 files changed, 20 insertions, 9 deletions

diff --git a/src/test/java/au/id/zancanaro/javacheck/object/MyObject.java b/src/test/java/au/id/zancanaro/javacheck/object/MyObject.java
index ac0c370..824fd8d 100644
--- a/src/test/java/au/id/zancanaro/javacheck/object/MyObject.java
+++ b/src/test/java/au/id/zancanaro/javacheck/object/MyObject.java
@@ -1,5 +1,13 @@
 package au.id.zancanaro.javacheck.object;
 
+import au.id.zancanaro.javacheck.Generator;
+import au.id.zancanaro.javacheck.ShrinkTree;
+
+import java.util.Random;
+
+import static au.id.zancanaro.javacheck.Generators.asciiCharacter;
+import static au.id.zancanaro.javacheck.Generators.stringOf;
+
 public class MyObject {
     public final String string;
     public final int value;
@@ -12,10 +20,21 @@ public class MyObject {
     }
 
     @UseForGeneration
-    public MyObject(String string, SubObject<Integer> subObject) {
+    public MyObject(
+            @UseGenerator(StringGenerator.class) String string,
+            SubObject<Integer> subObject) {
         this(string, string.length(), subObject);
     }
 
+    public static class StringGenerator implements Generator<String> {
+        public final Generator<String> gen = stringOf(asciiCharacter());
+
+        @Override
+        public ShrinkTree<String> generate(Random random, int size) {
+            return gen.generate(random, size);
+        }
+    }
+
     public MyObject add(MyObject other) {
         return new MyObject(
                 this.string + other.string,
diff --git a/src/test/java/au/id/zancanaro/javacheck/object/MyObjectAddTest.java b/src/test/java/au/id/zancanaro/javacheck/object/MyObjectAddTest.java
index 7965449..9321acb 100644
--- a/src/test/java/au/id/zancanaro/javacheck/object/MyObjectAddTest.java
+++ b/src/test/java/au/id/zancanaro/javacheck/object/MyObjectAddTest.java
@@ -1,23 +1,15 @@
 package au.id.zancanaro.javacheck.object;
 
-import au.id.zancanaro.javacheck.Generator;
-import au.id.zancanaro.javacheck.annotations.DataSource;
 import au.id.zancanaro.javacheck.annotations.Property;
 import au.id.zancanaro.javacheck.junit.Properties;
 import org.junit.runner.RunWith;
 
-import java.util.Collections;
-
-import static au.id.zancanaro.javacheck.Generators.ofType;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
 @RunWith(Properties.class)
 public class MyObjectAddTest {
 
-    @DataSource
-    public static Generator<MyObject> source = ofType(MyObject.class);
-
     @Property
     public void testAdd(MyObject a, MyObject b) {
         MyObject added = a.add(b);