I am a beginner in android.I am calling a webservice from my android project which returns a json string as response which contain a xml formatted string as one entry.
String jsoncontent=restTemplate.getForObject(constr+"getAssetdata/{Id}", String.class, curAcct.getiD());
final GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.registerTypeAdapter(Assets.class, new AssetDeserialiser());
final Gson gson = gsonBuilder.create();
Assets assetAcc = gson.fromJson(jsoncontent, Assets.class);
Toast.makeText(getApplicationContext(), assetAcc.getKeyValueData(), 68000).show();
Below is the json string that i got as webservice response
jsoncontent={"id":39,"name":"ICICI Bank","purchaseValue":6000.0,"purchaseDate":1402403751000,"keyValueData":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><root><Description><Name>Tax and other payments</Name><Value>433</Value></Description><Description><Name>Add more details...</Name><Value></Value></Description></root>"}
But i am getting a null value for assetAcc.getKeyValueData() after deserialization,there is no isue with other fields in assets.How to solve this issue? Please help me.
AssetDeserialiser.java:
public class AssetDeserialiser implements JsonDeserializer<Assets> {
#Override
public Assets deserialize(JsonElement arg0, Type arg1, JsonDeserializationContext arg2) throws JsonParseException {
JsonObject jobject =arg0.getAsJsonObject();
final Assets asset = new Assets();
try{
asset.setId(jobject.get("id").getAsInt());
asset.setName(jobject.get("name").getAsString());
asset.setPurchaseValue(jobject.get("purchaseValue").getAsFloat());
asset.setPurchaseDate(new Timestamp(jobject.get("purchaseDate").getAsLong()));
asset.setKeyValueData(jobject.get("keyValueData").isJsonNull() ? "" : jobject.get("keyValueData").getAsString());
}catch(Exception es){
System.out.println("es "+es);
}
return asset;
}
}
Assets.java:
public class Assets implements Serializable{
private Integer id;
private String name;
private Float purchaseValue;
private Timestamp purchaseDate;
private String keyValueData;
public Assets() {
super();
// TODO Auto-generated constructor stub
}
public Assets(Integer id, String name, Float purchaseValue, Timestamp purchaseDate, String keyValueData) {
super();
this.id = id;
this.name = name;
this.purchaseValue = purchaseValue;
this.purchaseDate = purchaseDate;
this.keyValueData = keyValueData;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Float getPurchaseValue() {
return purchaseValue;
}
public void setPurchaseValue(Float purchaseValue) {
this.purchaseValue = purchaseValue;
}
public Timestamp getPurchaseDate() {
return purchaseDate;
}
public void setPurchaseDate(Timestamp purchaseDate) {
this.purchaseDate = purchaseDate;
}
public String getKeyValueData() {
return keyValueData;
}
public void setKeyValueData(String keyValueData) {
this.keyValueData = keyValueData;
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
result = prime * result
+ ((keyValueData == null) ? 0 : keyValueData.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result
+ ((purchaseDate == null) ? 0 : purchaseDate.hashCode());
result = prime * result
+ ((purchaseValue == null) ? 0 : purchaseValue.hashCode());
return result;
}
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Assets other = (Assets) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
if (keyValueData == null) {
if (other.keyValueData != null)
return false;
} else if (!keyValueData.equals(other.keyValueData))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (purchaseDate == null) {
if (other.purchaseDate != null)
return false;
} else if (!purchaseDate.equals(other.purchaseDate))
return false;
if (purchaseValue == null) {
if (other.purchaseValue != null)
return false;
} else if (!purchaseValue.equals(other.purchaseValue))
return false;
return true;
}
#Override
public String toString() {
return name;
}
}
You can set this keyValueData after deserialisation from your json string that contain the xml string as below
String jsoncontent=restTemplate.getForObject(constr+"getAssetdata/{Id}", String.class, curAcct.getiD());
final GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.registerTypeAdapter(Assets.class, new AssetDeserialiser());
final Gson gson = gsonBuilder.create();
Assets assetAcc = gson.fromJson(jsoncontent, Assets.class);
JSONObject jsonObj=new JSONObject(jsoncontent);
assetAcc.setKeyValueData(jsonObj.getString("keyValueData"));
1.Use Parcelable -its much faster.
2.Timestamp change to long. (Then can parce this value like this):
private String parceDate(data long){
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");
try {
retrun df.format(your long from Assets.class);
}catch (Exception e){
return "";
}
}
UPDATE:
Y can change your getter and setter for use Timestamp object from Assets class like this:
public void setPurchaseDate(long purchaseDate){
this.purchaseDate=purchaseDate
}
public Timestamp getPurchaseDate(){
return new Timestamp(purchaseDate); //from java.sql.Timestamp;
}
You can use jackson for deserialization.
public class AssetDeserialiser extends JsonDeserializer<Asset> {
#Override
public Asset deserialize(JsonParser arg0, DeserializationContext arg1)
throws IOException, JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
JsonNode node = mapper.readTree(arg0);
final Asset asset = new Asset();
try{
asset.setId(mapper.readValue(node.get("id"),Integer.class));
asset.setName(mapper.readValue(node.get("name"),String.class));
asset.setPurchaseDate(mapper.readValue(node.get("purchaseDate"),Timestamp.class));
asset.setPurchaseValue(mapper.readValue(node.get("purchaseValue"),Float.class));
asset.setKeyValueData(mapper.readValue(node.get("keyValueData"), String.class));
}catch(Exception es){
System.out.println("es "+es);
}
return asset;
}
}
This may help you.
Also you will have to add "#JsonDeserialize(using=AssetDeserialiser.class)" at the beginning of your asset class. It is done like this:
#JsonDeserialize(using=AssetDeserialiser.class)
public class Asset implements Serializable{
Related
I'm trying to figure out response of a GET method API, it is returning extra attribute with name "attributesMap"
Reponse entity return code is return ResponseEntity.ok(document);
document model class
private String id;
private String format;
private List<Attribute> attributes;
private String type;
private String accessright;
public Document() {
}
/**
* Copy constructor.
*/
public Document(Document source) {
this.id = source.id;
this.format = source.format;
this.type = source.type;
this.accessright = source.accessright;
this.attributes = source.attributes;
}
public static Document newDocument(String type, String id, String format, String accessright, List<Attribute> attributes) {
Document document = new Document();
document.type = type;
document.id = id;
document.format = format;
document.accessright = accessright;
document.attributes = attributes;
return document;
}
public static Document newCompleteDocument(String id, String type, String format, String accessright, List<Attribute> attributes) {
Document document = new Document();
document.id = id;
document.type = type;
document.format = format;
document.accessright = accessright;
document.attributes = attributes;
return document;
}
//
// Getters and setters ahead
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFormat() {
return format;
}
public void setFormat(String format) {
this.format = format;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public List<Attribute> getAttributes() {
return attributes;
}
public void setAttributes(List<Attribute> attributes) {
this.attributes = attributes;
}
public String getAccessright() {
return accessright;
}
public void setAccessright(String accessright) {
this.accessright = accessright;
}
public Map<String, List<String>> getAttributesMap() {
Map<String, List<String>> attributesMap = getAttributes().stream().collect(Collectors.toMap(Attribute::getName, Attribute::getValues));
return attributesMap;
}
#Override
public String toString() {
final StringBuffer sb = new StringBuffer("Document{");
sb.append("id='").append(id).append('\'');
sb.append(", type='").append(type).append('\'');
sb.append(", format='").append(format).append('\'');
sb.append(", accessright='").append(accessright).append('\'');
sb.append(", attributes=[").append(attributes);
if (attributes != null) {
for (Attribute attribute:attributes) {
sb.append(attribute.getName()).append(":").append(attribute.getValues().toArray()).append(",");
}
}
sb.append("]}");
return sb.toString();
}
#Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Document document = (Document) o;
if (id != null ? !id.equals(document.id) : document.id != null) {
return false;
}
if (type != null ? !type.equals(document.type) : document.type != null) {
return false;
}
if (format != null ? !format.equals(document.format) : document.format != null) {
return false;
}
if (accessright != null ? !accessright.equals(document.accessright) : document.accessright != null) {
return false;
}
return attributes != null ? attributes.equals(document.attributes) : document.attributes == null;
}
#Override
public int hashCode() {
int result = id != null ? id.hashCode() : 0;
result = 31 * result + (type != null ? type.hashCode() : 0);
result = 31 * result + (format != null ? format.hashCode() : 0);
result = 31 * result + (accessright != null ? accessright.hashCode() : 0);
result = 31 * result + (attributes != null ? attributes.hashCode() : 0);
return result;
}
}
but the API reponse JSON as an extra attribute "attributesMap". Sample JSON as below:
{
"id": "xxx",
"format": "xx",
"attributes": [
{
"name": "attr1",
"values": [
"val1"
]
}
],
"type": "test type",
"accessright": "DELETE",
"attributesMap": {
"name": "attr1",
"values": [
"val1"
]
}
}
Can anyone help me figure out how to check where this attribute coming from , when I debugged till the return
return ResponseEntity.ok(document);
there is no attributesMap in the document model object.
The problem in your case is that you have the getter getAttributesMap. What will jackson serialize by default?
All public fields
All getter methods
What can you do?
Rename the method
Exclude the getter with #JsonIgnore
#JsonIgnore
public Map<String, List<String>> getAttributesMap() {
Map<String, List<String>> attributesMap = getAttributes().stream().collect(Collectors.toMap(Attribute::getName, Attribute::getValues));
return attributesMap;
}
You could also provide your own ObjectMapper bean with the following settings:
var mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
mapper.setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.NONE);
or
var mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE);
mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
This would only serialize fields, not getters.
I'm getting the following error when I tried to processing the data from hazelcast jet.
Caused by: java.lang.IllegalArgumentException: Invalid lambda deserialization
at com.example.LearnJet.joins.LeftJoins.$deserializeLambda$(LeftJoins.java:1)
... 59 more
Here is the code:-
AddToCart1 instance
public class AddToCart1 implements Serializable {
private int number;
private String cart;
public AddToCart1() {
super();
// TODO Auto-generated constructor stub
}
public int getNumber() {
return number;
}
public AddToCart1(int number, String cart) {
super();
this.number = number;
this.cart = cart;
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((cart == null) ? 0 : cart.hashCode());
result = prime * result + number;
return result;
}
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
AddToCart1 other = (AddToCart1) obj;
if (cart == null) {
if (other.cart != null)
return false;
} else if (!cart.equals(other.cart))
return false;
if (number != other.number)
return false;
return true;
}
public void setNumber(int number) {
this.number = number;
}
public String getCart() {
return cart;
}
public void setCart(String cart) {
this.cart = cart;
}
}
PageVisit1 instance
public class PageVisit1 implements Serializable {
/**
*
*/
private int number;
private String pageName;
public PageVisit1() {
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + number;
result = prime * result + ((pageName == null) ? 0 : pageName.hashCode());
return result;
}
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
PageVisit1 other = (PageVisit1) obj;
if (number != other.number)
return false;
if (pageName == null) {
if (other.pageName != null)
return false;
} else if (!pageName.equals(other.pageName))
return false;
return true;
}
public PageVisit1(int number, String pageName) {
super();
this.number = number;
this.pageName = pageName;
}
/**
* #return the number
*/
public int getNumber() {
return number;
}
/**
* #param number the number to set
*/
public void setNumber(int number) {
this.number = number;
}
/**
* #return the pageName
*/
public String getPageName() {
return pageName;
}
/**
* #param pageName the pageName to set
*/
public void setPageName(String pageName) {
this.pageName = pageName;
}
}
Here is the main class
public class LeftJoins {
public static void main(String[] args) throws InvocationTargetException {
JetInstance jet = Jet.bootstrappedInstance();
IList<AddToCart1> addToCartList = jet.getList("cart");
IList<PageVisit1> paymentList = jet.getList("page");
// AddToCartData
AddToCart1 ad1 = new AddToCart1();
ad1.setNumber(1);
ad1.setCart("lulu bazar");
AddToCart1 ad2 = new AddToCart1();
ad2.setNumber(2);
ad2.setCart("krishna bazar");
AddToCart1 ad3 = new AddToCart1();
ad3.setNumber(3);
ad3.setCart("ram bazar");
addToCartList.add(ad1);
addToCartList.add(ad2);
addToCartList.add(ad3);
// Page Data
PageVisit1 pg1 = new PageVisit1();
pg1.setNumber(1);
pg1.setPageName("k login");
PageVisit1 pg2 = new PageVisit1();
pg2.setNumber(2);
pg2.setPageName("plogin");
paymentList.add(pg1);
paymentList.add(pg2);
// creating a piple-line here
Pipeline p = Pipeline.create();
BatchStageWithKey<AddToCart1, Object> cart = p.readFrom(Sources.<AddToCart1>list("cart"))
.groupingKey(cart1 -> cart1.getNumber());
BatchStageWithKey<PageVisit1, Object> page = p.readFrom(Sources.<PageVisit1>list("page"))
.groupingKey(page1 -> page1.getNumber());
BatchStage<Tuple2<List<PageVisit1>, List<AddToCart1>>> joinedLists1 = page.aggregate2(toList(), cart, toList())
.map(Entry::getValue);
BatchStage<Tuple2<List<PageVisit1>, List<AddToCart1>>> m = joinedLists1.filter(pair -> !pair.f0().isEmpty());
m.writeTo(Sinks.logger());
jet.newJob(p).join();
// joinedLists.filter(pair -> !pair.isEmpty());
}
The code is obviously incomplete, because there's no page variable so that page.aggregate2(...) shouldn't compile.
For this reason, I'm unable to point you to the exact line where the issue occurs. However, the error message tells you're using a "standard" lambda from the JDK that isn't Serializable, whereas you should use the ones from Jet, which are.
Please check this package.
EDIT:
I've created a dedicated GitHub project with the above code.
Everything works as expected. The 2 tuples are displayed correctly in the log:
09:33:59.974 [ INFO] [c.h.j.i.c.WriteLoggerP] [05d8-7d0a-e3c0-0001/loggerSink#0] ([ch.frankel.so.PageVisit1#c544b8f8], [ch.frankel.so.AddToCart1#41c722ed])
09:33:59.974 [ INFO] [c.h.j.i.c.WriteLoggerP] [05d8-7d0a-e3c0-0001/loggerSink#0] ([ch.frankel.so.PageVisit1#58fbcb54], [ch.frankel.so.AddToCart1#c666a2c4])
Hello folks this may be dumb question but as a beginner am struggling with this how to group values based on id in list, Now let me clarify you briefly am having set of objects like this :
ID:1,UserID:330
ID:2,UserID:303
ID:3,UserID:090
ID:1,UserID:302
ID:2,UserID:306
How my list should look like is(Json Format):
[{"ID":1,"UserID":[330,302]},{"ID":2,"UserID":[303,306]},{"ID":3,"UserID":[090]}]
Now let me post what i have tried so far:
final List<Integer>list=new ArrayList<>();
final List<SpareReturnModel>lisobj=new ArrayList<>();
int duplicate=0;
for(int i=0;i<tView.getSelected().size();i++){
Object o= tView.getSelected().get(i).getValue();
SpareReturnModel asset=(SpareReturnModel) o;
int flag=asset.getFlag();
if(flag==2) {
int warehouseid = asset.getWareHouseID();
asset.setWareHouseID(warehouseid);
int partid = asset.getSerialNoID();
list.add(partid);
}
else {
Log.d("s","no value for header");
}
if(duplicate!=asset.getWareHouseID()){
asset.setParlist(list);
asset.setWareHouseID(asset.getWareHouseID());
lisobj.add(asset);
list.clear();
}
duplicate=asset.getWareHouseID();
}
Gson gson=new Gson();
//this will convert list to json
String value=gson.toJson(listobj);
SpareReturn Model Class:
public class SpareReturnModel {
private Integer SerialNoID;
private String SerialNumber;
private List<Integer>parlist;
public List<Integer> getParlist() {
return parlist;
}
public void setParlist(List<Integer> parlist) {
this.parlist = parlist;
}
public Integer getFlag() {
return flag;
}
public void setFlag(Integer flag) {
this.flag = flag;
}
private Integer flag;
public Integer getWareHouseID() {
return WareHouseID;
}
public void setWareHouseID(Integer wareHouseID) {
WareHouseID = wareHouseID;
}
private Integer WareHouseID;
public Integer getSerialNoID() {
return SerialNoID;
}
public void setSerialNoID(Integer serialNoID) {
SerialNoID = serialNoID;
}
public String getSerialNumber() {
return SerialNumber;
}
public void setSerialNumber(String serialNumber) {
SerialNumber = serialNumber;
}
}
Can someone let me know how to achieve this am struggling with this.
I simplify your class to make solution clearer:
public class SpareReturnModel implements Comparable<SpareReturnModel> {
private Integer id;
private String userId;
public SpareReturnModel(Integer id, String userId) {
this.id = id;
this.userId = userId;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
#Override
public int compareTo(SpareReturnModel other) {
return this.getId().compareTo(other.getId());
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
SpareReturnModel model = (SpareReturnModel) o;
if (id != null ? !id.equals(model.id) : model.id != null) return false;
return userId != null ? userId.equals(model.userId) : model.userId == null;
}
#Override
public int hashCode() {
int result = id != null ? id.hashCode() : 0;
result = 31 * result + (userId != null ? userId.hashCode() : 0);
return result;
}
}
and add JsonSpareReturnModel
public class JsonSpareRuturnModel implements Comparable<JsonSpareRuturnModel> {
private final List<SpareReturnModel> modelList;
private final Integer id;
public JsonSpareRuturnModel(List<SpareReturnModel> modelList) {
this.modelList = modelList;
this.id = modelList.get(0).getId();
}
private final String toJson() {
return String.format("{\"ID\":%s,\"UserID\":%s}", id, formatUserIdList());
}
private String formatUserIdList() {
StringBuilder builder = new StringBuilder("[");
Iterator<SpareReturnModel> modelIterator = modelList.iterator();
while (modelIterator.hasNext()) {
builder.append(modelIterator.next().getUserId());
if (modelIterator.hasNext()) {
builder.append(",");
}
}
builder.append("]");
return builder.toString();
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
JsonSpareRuturnModel that = (JsonSpareRuturnModel) o;
return id != null ? id.equals(that.id) : that.id == null;
}
#Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
#Override
public int compareTo(JsonSpareRuturnModel other) {
return this.id.compareTo(other.id);
}
#Override
public String toString() {
return toJson();
}
if you need to group by user id you need to sort your models according to id's
and place them to json format model:
public class Main {
public static void main(String[] args) {
List<SpareReturnModel> models = new ArrayList<>(Arrays.asList(
new SpareReturnModel(1, "330"),
new SpareReturnModel(2, "303"),
new SpareReturnModel(3, "090"),
new SpareReturnModel(1, "302"),
new SpareReturnModel(2, "306")
));
Map<Integer, List<SpareReturnModel>> groupById = new HashMap<>();
for (SpareReturnModel model : models) {
List<SpareReturnModel> listById = groupById.get(model.getId());
if (listById == null) {
groupById.put(model.getId(), new ArrayList<>(Arrays.asList(model)));
} else {
listById.add(model);
}
}
List<JsonSpareRuturnModel> jsonList = new ArrayList<>();
for (Map.Entry<Integer, List<SpareReturnModel>> pair : groupById.entrySet()) {
jsonList.add(new JsonSpareRuturnModel(pair.getValue()));
}
System.out.println(jsonList);
final String expected = "[{\"ID\":1,\"UserID\":[330,302]}, {\"ID\":2,\"UserID\":[303,306]}, {\"ID\":3,\"UserID\":[090]}]";
System.out.println(jsonList.toString().equals(expected));
}
}
I have json objects in the following schema:
{
name: "foo",
timestamp: 1475840608763,
payload:
{
foo: "bar"
}
}
Here, the payload field contains an embedded json object, and the schema of this object is dynamic, and different each time.
The payload object is the raw output obtained from different API services, and different methods of different API services. It isn't possible to map it to all possible values.
Is it possible to have a java class such as the following:
public class Event
{
public String name;
public long timestamp;
public JsonObject payload;
}
Or something along those lines, so I can receive the basic schema and process it, then send it to the relevant class which will convert payload to its appropriate expected class?
Using JsonNode
You could use JsonNode from the com.fasterxml.jackson.databind package:
public class Event {
public String name;
public long timestamp;
public JsonNode payload;
// Getters and setters
}
Then parse it using:
String json = "{\"name\":\"foo\",\"timestamp\":1475840608763,"
+ "\"payload\":{\"foo\":\"bar\"}}";
ObjectMapper mapper = new ObjectMapper();
Event event = mapper.readValue(json, Event.class);
Mapping JsonNode to a POJO
Consider, for example, you want to map the JsonNode instance to the following class:
public class Payload {
private String foo;
// Getters and setters
}
It can be achieved with the following piece of code:
Payload payload = mapper.treeToValue(event.getPayload(), Payload.class);
Considering a Map<String, Object>
Depending on your requirements, you could use a Map<String, Object> instead of JsonNode:
public class Event {
public String name;
public long timestamp;
public Map<String, Object> payload;
// Getters and setters
}
If you need to convert a Map<String, Object> to a POJO, use:
Payload payload = mapper.convertValue(event.getPayload(), Payload.class);
According to the Jackson documentation, the convertValue() method is functionally similar to first serializing given value into JSON, and then binding JSON data into value of given type, but should be more efficient since full serialization does not (need to) occur. However, same converters (serializers and deserializers) will be used as for data binding, meaning same object mapper configuration works.
Does this help?
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
public class Payload {
private final Map<String, Object> other = new HashMap<>();
#JsonAnyGetter
public Map<String, Object> any() {
return other;
}
#JsonAnySetter
public void set(final String name, final Object value) {
other.put(name, value);
}
public Map<String, Object> getOther() {
return other;
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = (prime * result) + ((other == null) ? 0 : other.hashCode());
return result;
}
#Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof Payload)) {
return false;
}
Payload other = (Payload) obj;
if (this.other == null) {
if (other.other != null) {
return false;
}
} else if (!this.other.equals(other.other)) {
return false;
}
return true;
}
#Override
public String toString() {
return "Payload [other=" + other + "]";
}
}
Then this owning class
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
public class Outer {
private final String name;
private final long timestamp;
private final Payload payload;
#JsonCreator
public Outer(#JsonProperty("name") final String name, #JsonProperty("timestamp") final long timestamp, #JsonProperty("payload") final Payload payload) {
super();
this.name = name;
this.timestamp = timestamp;
this.payload = payload;
}
public String getName() {
return name;
}
public long getTimestamp() {
return timestamp;
}
public Payload getPayload() {
return payload;
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = (prime * result) + ((name == null) ? 0 : name.hashCode());
result = (prime * result) + ((payload == null) ? 0 : payload.hashCode());
result = (prime * result) + (int) (timestamp ^ (timestamp >>> 32));
return result;
}
#Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof Outer)) {
return false;
}
Outer other = (Outer) obj;
if (name == null) {
if (other.name != null) {
return false;
}
} else if (!name.equals(other.name)) {
return false;
}
if (payload == null) {
if (other.payload != null) {
return false;
}
} else if (!payload.equals(other.payload)) {
return false;
}
if (timestamp != other.timestamp) {
return false;
}
return true;
}
#Override
public String toString() {
return "Outer [name=" + name + ", timestamp=" + timestamp + ", payload=" + payload + "]";
}
}
Then to test
public class Main {
private static final ObjectMapper mapper = new ObjectMapper();
public static void main(final String... args) throws JsonParseException, JsonMappingException, IOException {
final Outer outer = mapper.readValue(new File("test.json"), Outer.class);
System.out.println(outer);
}
}
Gives console output of
Outer [name=foo, timestamp=1475840608763, payload=Payload [other={foo=bar}]]
I'm trying to save a serialize/deserialize a List of POJOS with Gson. While normally this isn't such a special task, I'm getting an exception that I've never seen before:
01-11 14:17:22.556: E/AndroidRuntime(15941): java.lang.RuntimeException:
Unable to start activity ComponentInfo{com.timkranen.playpalproject/com.timkranen.playpalproject.HomeActivity}:
java.lang.RuntimeException: Unable to invoke no-args constructor for interface java.util.concurrent.locks.Lock.
Register an InstanceCreator with Gson for this type may fix this problem.
I'm suspecting that it has something to with the fact that the List items are being loaded in an AsyncTask. Anyone have experience with this problem?
I've tried putting the logic that I execute within onSaveInstanceState (for saving) in a synchronized method, but that didn't help.
Edit
Here's some of my code to try and make it more clear. I've got a List that is called friendsList. The List is filled in this AsyncTask and is executed in onCreateView()
private class RetrieveFriends extends AsyncTask<Void, Integer, String> {
#Override
protected String doInBackground(Void... params) {
// get friends
if (friendProfiles == null || friendProfiles.size() == 0) {
friendProfiles = new ArrayList<Profile>();
if (currentProfile.getFriendUids() != null
&& currentProfile.getFriendUids().size() > 0)
for (String fUid : currentProfile.getFriendUids()) {
Profile friend = ProfileDataManager
.getProfileFromId(fUid);
friendProfiles.add(friend);
}
if (friendProfiles.size() == 0) {
return "null";
}
}
return "notnull";
}
#Override
protected void onPostExecute(String result) {
if (!result.equals("null")) {
loadingFriendsBar.setVisibility(View.INVISIBLE);
friendsList.setVisibility(View.VISIBLE);
FriendListAdapter adapter = new FriendListAdapter(
containedActivity, R.layout.friendslist_row,
friendProfiles);
friendsList.setAdapter(adapter);
} else {
loadingFriendsBar.setVisibility(View.INVISIBLE);
friendMsg.setVisibility(View.VISIBLE);
}
}
}
Now in the onSaveInstanceState I serialize that List to JSON like this:
private synchronized void saveToState(Bundle state) {
Gson gson = new Gson();
Type listOfProfiles = new TypeToken<List<Profile>>() {
}.getType();
String json = gson.toJson(friendProfiles, listOfProfiles);
state.putString("json_friendProfiles", json);
}
That method is called directly in onSaveInstanceState(). Retrieving it is the same:
private synchronized void retrieveFromState(String json) {
Type listOfProfiles = new TypeToken<List<Profile>>() {
}.getType();
Gson gson = new Gson();
friendProfiles = (List<Profile>) gson.fromJson(json,
listOfProfiles);
}
The weird thing is, the state is correctly saved when navigating to a different Fragment. The error only occurs when I change the orientation.
Edit: On request here's the Profile class
public class Profile {
private String mEmail;
private String mPassword;
private String uid;
// optional properties
private String name;
private String location;
private String about;
private ParseFile image; // not certain of data type
private List<String> friendUids;
public String getName() {
if (name == null || name.equals("")) {
return "Name unknown";
}
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
if (location == null || location.equals("")) {
return "Location unknown";
}
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getAbout() {
if (about == null || about.equals("")) {
return "About unknown";
}
return about;
}
public void setAbout(String about) {
this.about = about;
}
public void setUid(String Uid) {
this.uid = Uid;
}
public String getUid() {
return this.uid;
}
public String getPassword() {
return mPassword;
}
public String getEmail() {
return mEmail;
}
public Profile(String email, String password) {
this.mEmail = email;
this.mPassword = password;
}
/*
* Saves a Profile and returns the profiles UID This is ONLY APPLICABLE for
* NEW profiles use the update method to update existing profile data
*/
public void saveToParse(SaveCallback saveCallBack) {
if (ProfileDataManager.IsRegistered(this) != true) {
ParseObject pObject = new ParseObject("Profiles");
pObject.put("email", this.mEmail);
pObject.put("password", this.mPassword);
pObject.saveInBackground(saveCallBack);
} else {
saveCallBack.done(new ParseException(ErrorCodes.ALREADY_REGISTERED,
"AlreadyRegistered"));
}
}
public void update() {
ParseQuery<ParseObject> query = ParseQuery.getQuery("Profiles");
query.getInBackground(this.uid, new GetCallback<ParseObject>() {
#Override
public void done(ParseObject object, ParseException e) {
if (e == null) {
// update the object
object.put("email", Profile.this.mEmail);
object.put("password", Profile.this.mPassword);
if (Profile.this.name != null) {
object.put("name", Profile.this.name);
}
if (Profile.this.location != null) {
object.put("location", Profile.this.location);
}
if (Profile.this.about != null) {
object.put("about", Profile.this.about);
}
if (Profile.this.image != null) {
object.put("profileImage", Profile.this.image);
}
if (Profile.this.friendUids != null
&& Profile.this.friendUids.size() != 0) {
object.put("friends", Profile.this.friendUids);
}
object.saveInBackground();
}
}
});
}
/*
* Use updateWithCallBack when you want to update an object but want to show
* the updated data immediatly using a callback, when calling this method
* make sure that currentProfile in HomeActivity is set to the new Profile!
*/
public void updateWithCallBack(final SaveCallback callBack) {
ParseQuery<ParseObject> query = ParseQuery.getQuery("Profiles");
query.getInBackground(this.uid, new GetCallback<ParseObject>() {
#Override
public void done(ParseObject object, ParseException e) {
if (e == null) {
// update the object
object.put("email", Profile.this.mEmail);
object.put("password", Profile.this.mPassword);
if (Profile.this.name != null) {
object.put("name", Profile.this.name);
}
if (Profile.this.location != null) {
object.put("location", Profile.this.location);
}
if (Profile.this.about != null) {
object.put("about", Profile.this.about);
}
if (Profile.this.image != null) {
object.put("profileImage", Profile.this.image);
}
if (Profile.this.friendUids != null
&& Profile.this.friendUids.size() != 0) {
object.put("friends", Profile.this.friendUids);
}
object.saveInBackground(callBack);
}
}
});
}
// retrieves the image, when done calls callback
public void retrieveProfileImage(GetDataCallback callBack) {
this.image.getDataInBackground(callBack);
}
public ParseFile getProfileImage() {
return this.image;
}
public void setProfileImage(ParseFile image) {
this.image = image;
}
public void saveProfileImage(Bitmap image) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 50, stream);
byte[] byteArray = stream.toByteArray();
String imgid = this.getUid() + "_profile_image.jpeg";
String fileNameForImage = this.getUid() + "_profile_image.jpeg";
this.image = new ParseFile(fileNameForImage, byteArray);
}
public List<String> getFriendUids() {
return this.friendUids;
}
public void addFriend(String uid) {
if (this.friendUids != null) {
friendUids.add(uid);
} else {
friendUids = new ArrayList<String>();
friendUids.add(uid);
}
}
public void setFriends(Object friends) {
ArrayList<String> f = (ArrayList<String>) friends;
this.friendUids = f;
}
}
Gson object
private Gson gson = new GsonBuilder().
setExclusionStrategies(new ParseExclusion()).
create();
Exclusion Class
private class ParseExclusion implements ExclusionStrategy {
public boolean shouldSkipClass(Class<?> arg0) {
return false;
}
public boolean shouldSkipField(FieldAttributes f) {
return (f.getDeclaredClass() == Lock.class);
}
}
Finally:
Type type = new TypeToken<List<Profile>>() {}.getType();
List<Profile>) friendProfiles = new ArrayList<Profile>();
friendProfiles = gson.fromJson(json,type);