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Added a test to ensure Gson can use JSON fields to store type information.

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This commit is contained in:
Inderjeet Singh 2009-10-06 04:25:28 +00:00
parent ae85e6cce6
commit d416361ac5
1 changed files with 36 additions and 2 deletions
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38
gson/src/test/java/com/google/gson/functional/CustomDeserializerTest.java
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@ -16,8 +16,6 @@
package com.google.gson.functional; package com.google.gson.functional;
import java.lang.reflect.Type;
import com.google.gson.Gson; import com.google.gson.Gson;
import com.google.gson.GsonBuilder; import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonDeserializationContext;
@ -28,6 +26,8 @@ import com.google.gson.JsonParseException;
import junit.framework.TestCase; import junit.framework.TestCase;
import java.lang.reflect.Type;
/** /**
* Functional Test exercising custom deserialization only. When test applies to both * Functional Test exercising custom deserialization only. When test applies to both
* serialization and deserialization then add it to CustomTypeAdapterTest. * serialization and deserialization then add it to CustomTypeAdapterTest.
@ -106,4 +106,38 @@ public class CustomDeserializerTest extends TestCase {
return new DataHolder(dataString + SUFFIX); return new DataHolder(dataString + SUFFIX);
} }
} }
public void testJsonTypeFieldBasedDeserialization() {
String json = "{field1:'abc',field2:'def',__type__:'SUB_TYPE1'}";
Gson gson = new GsonBuilder().registerTypeAdapter(MyBase.class, new JsonDeserializer<MyBase>() {
public MyBase deserialize(JsonElement json, Type pojoType,
JsonDeserializationContext context) throws JsonParseException {
String type = json.getAsJsonObject().get(MyBase.TYPE_ACCESS).getAsString();
return context.deserialize(json, SubTypes.valueOf(type).getSubclass());
}
}).create();
SubType1 target = (SubType1) gson.fromJson(json, MyBase.class);
assertEquals("abc", target.field1);
}
private static class MyBase {
static final String TYPE_ACCESS = "__type__";
}
private enum SubTypes {
SUB_TYPE1(SubType1.class),
SUB_TYPE2(SubType2.class);
private final Type subClass;
private SubTypes(Type subClass) {
this.subClass = subClass;
}
public Type getSubclass() {
return subClass;
}
}
private static class SubType1 extends MyBase {
String field1;
}
private static class SubType2 extends MyBase {
@SuppressWarnings("unused")
String field2;
}
} }