Created
July 29, 2012 23:05
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Real Collection Deserializer to parse arrays with GSON
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import java.lang.reflect.ParameterizedType; | |
import java.lang.reflect.Type; | |
import java.util.ArrayList; | |
import java.util.Collection; | |
import java.util.Iterator; | |
import com.google.gson.Gson; | |
import com.google.gson.JsonArray; | |
import com.google.gson.JsonDeserializationContext; | |
import com.google.gson.JsonDeserializer; | |
import com.google.gson.JsonElement; | |
import com.google.gson.JsonParseException; | |
public class CollectionDeserializer implements JsonDeserializer<Collection<?>> { | |
@Override | |
public Collection<?> deserialize(JsonElement json, Type typeOfT, | |
JsonDeserializationContext context) throws JsonParseException { | |
Type realType = ((ParameterizedType)typeOfT).getActualTypeArguments()[0]; | |
return parseAsArrayList(json, realType); | |
} | |
/** | |
* @param serializedData | |
* @param type | |
* @return | |
*/ | |
@SuppressWarnings("unchecked") | |
public <T> ArrayList<T> parseAsArrayList(JsonElement json, T type) { | |
ArrayList<T> newArray = new ArrayList<T>(); | |
Gson gson = new Gson(); | |
JsonArray array= json.getAsJsonArray(); | |
Iterator<JsonElement> iterator = array.iterator(); | |
while(iterator.hasNext()){ | |
JsonElement json2 = (JsonElement)iterator.next(); | |
T object = (T) gson.fromJson(json2, (Class<?>)type); | |
newArray.add(object); | |
} | |
return newArray; | |
} | |
} |
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public class JSONParsingTest { | |
List<World> worlds; | |
@Test | |
public void grantThatDeserializerWorksAndParseObjectArrays(){ | |
String worldAsString = "{\"worlds\": [" + | |
"{\"name\":\"name1\",\"id\":1}," + | |
"{\"name\":\"name2\",\"id\":2}," + | |
"{\"name\":\"name3\",\"id\":3}" + | |
"]}"; | |
GsonBuilder builder = new GsonBuilder(); | |
builder.registerTypeAdapter(Collection.class, new CollectionDeserializer()); | |
Gson gson = builder.create(); | |
Object decoded = gson.fromJson((String)worldAsString, JSONParsingTest.class); | |
assertNotNull(decoded); | |
assertTrue(JSONParsingTest.class.isInstance(decoded)); | |
JSONParsingTest decodedObject = (JSONParsingTest)decoded; | |
assertEquals(3, decodedObject.worlds.size()); | |
assertEquals((Long)2L, decodedObject.worlds.get(1).getId()); | |
} | |
} |
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public class World { | |
private String name; | |
private Long id; | |
public void setName(String name) { | |
this.name = name; | |
} | |
public String getName() { | |
return name; | |
} | |
public Long getId() { | |
return id; | |
} | |
public void setId(Long id) { | |
this.id = id; | |
} | |
} |
Hi @amrafu
Sorry by the late, I missed up your answer notification.
Please, which version of GSon are you using?
I will try to simulate your problem to help you! ;)
Works great! Thanks! :-)
Thanks! Exactly what I'm looking for!
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Nice solution, I used it but I got error on: CollectionDeserializer.java
...
@OverRide
public Collection<?> deserialize(JsonElement json, Type typeOfT,
...
error:
The method deserialize(JsonElement, Type, JsonDeserializationContext) of type CollectionDeserializer must override a superclass method
Any idea?
Thanks in advance