Added tests to ensure that subclass objects that are of a parameterized type are serialized per their declared type in lists or maps.
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@ -70,6 +70,49 @@ public class MoreSpecificTypeSerializationTest extends TestCase {
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assertEquals(3, sub.get("s").getAsInt());
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}
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/**
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* For parameterized type, Gson ignores the more-specific type and sticks to the declared type
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*/
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public void testParameterizedSubclassFields() {
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ClassWithParameterizedBaseFields target = new ClassWithParameterizedBaseFields(
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new ParameterizedSub<String>("one", "two"));
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String json = gson.toJson(target);
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assertTrue(json.contains("\"t\":\"one\""));
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assertFalse(json.contains("\"s\""));
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}
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/**
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* For parameterized type in a List, Gson ignores the more-specific type and sticks to
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* the declared type
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*/
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public void testListOfParameterizedSubclassFields() {
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Collection<ParameterizedBase<String>> list = new ArrayList<ParameterizedBase<String>>();
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list.add(new ParameterizedBase<String>("one"));
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list.add(new ParameterizedSub<String>("two", "three"));
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ClassWithContainersOfParameterizedBaseFields target =
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new ClassWithContainersOfParameterizedBaseFields(list, null);
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String json = gson.toJson(target);
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assertTrue(json, json.contains("{\"t\":\"one\"}"));
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assertFalse(json, json.contains("\"s\":"));
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}
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/**
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* For parameterized type in a map, Gson ignores the more-specific type and sticks to the
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* declared type
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*/
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public void testMapOfParameterizedSubclassFields() {
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Map<String, ParameterizedBase<String>> map = new HashMap<String, ParameterizedBase<String>>();
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map.put("base", new ParameterizedBase<String>("one"));
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map.put("sub", new ParameterizedSub<String>("two", "three"));
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ClassWithContainersOfParameterizedBaseFields target =
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new ClassWithContainersOfParameterizedBaseFields(null, map);
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JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
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assertEquals("one", json.get("base").getAsJsonObject().get("t").getAsString());
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JsonObject sub = json.get("sub").getAsJsonObject();
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assertEquals("two", sub.get("t").getAsString());
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assertNull(sub.get("s"));
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}
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private static class Base {
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int b;
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Base(int b) {
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@ -100,4 +143,36 @@ public class MoreSpecificTypeSerializationTest extends TestCase {
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this.map = map;
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}
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}
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private static class ParameterizedBase<T> {
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T t;
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ParameterizedBase(T t) {
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this.t = t;
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}
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}
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private static class ParameterizedSub<T> extends ParameterizedBase<T> {
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T s;
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ParameterizedSub(T t, T s) {
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super(t);
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this.s = s;
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}
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}
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private static class ClassWithParameterizedBaseFields {
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ParameterizedBase<String> b;
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ClassWithParameterizedBaseFields(ParameterizedBase<String> b) {
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this.b = b;
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}
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}
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private static class ClassWithContainersOfParameterizedBaseFields {
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Collection<ParameterizedBase<String>> collection;
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Map<String, ParameterizedBase<String>> map;
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ClassWithContainersOfParameterizedBaseFields(Collection<ParameterizedBase<String>> collection,
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Map<String, ParameterizedBase<String>> map) {
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this.collection = collection;
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this.map = map;
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}
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}
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}
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