How to expose name of class to Gson object? - json

I have following JSON array:
[{avgSpeed: 39.43, customerId: 124, distance: 13.8, endDate: "2014-11-30T10:40:55Z",…},…]
where
0: {avgSpeed: 39.43, customerId: 124, distance: 13.8, endDate: "2014-11-30T10:40:55Z",…}
1: {carId: 4942, currentMileage: 138903, dateOfPurchase: "16-????-2007", id: 124, initialMileage: 13,…}
I want to have each substring named as 0 - Track, 1 - MyCars, i.e.:
0: {Track: {avgSpeed: 39.43, customerId: 124, distance: 13.8, endDate: "2014-11-30T10:40:55Z",…}}
1: {MyCars: {carId: 4942, currentMileage: 138903, dateOfPurchase: "16-????-2007", id: 124, initialMileage: 13,…})
How to achieve this?
I extract Track and MyCars from the Hibernate named query as:
<sql-query name="findAllPrivateTracks">
<return alias="t" class="core.domain.track.Track"/>
<return alias="xmc" class="core.domain.car.MyCars"/>
<![CDATA[
SELECT {t.*},
{xmc.*}
FROM edrive.Tracks t
JOIN edrive.Accounts a
ON a.Id = t.CustomerId
JOIN xxmycars xmc
ON xmc.id = t.customerId
AND xmc.ownerId = a.parentAccountId
WHERE a.ParentAccountId = :customerId
ORDER BY t.trackDate DESC
]]>
</sql-query>
and in the code:
List<?> result = (List<?>)session.getNamedQuery("findAllPrivateTracks")
.setLong("customerId", customerId)
.list();
My transformer:
List<?> list = trackDao.getTracksForCustomer(httpUtilities.getCustomerId());
GsonBuilder builder = new GsonBuilder();
builder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
builder.setPrettyPrinting();
builder.registerTypeAdapter(Track.class, new TrackTranslator());
builder.registerTypeAdapter(MyCars.class, new MyCarsTranslator());
Gson gson = builder.create();
JsonElement je = gson.toJsonTree(list);
String s = gson.toJson(list);
Thank you.

Solution is to use list of pairs Track and MyCars.
Code sample is below:
class Pair<Track,MyCars> {
private final Track track;
private final MyCars myCars;
public Pair( Track track, MyCars myCars ) {
this.track = track;
this.myCars = myCars;
}
public Track getTrack() { return track; }
public MyCars getMyCars() { return myCars; }
#Override
public int hashCode() { return track.hashCode() ^ myCars.hashCode(); }
#Override
public boolean equals(Object o) {
if (o == null) return false;
if (!(o instanceof Pair)) return false;
Pair<?, ?> pairo = (Pair<?, ?>) o;
return this.track.equals(pairo.getTrack()) &&
this.myCars.equals(pairo.getMyCars());
}
};
conversion of List returned from database (it is a Hibernate's list of Object[]):
List<?> list = trackDao.getTracksForCustomer(httpUtilities.getCustomerId());
List<Pair<Track,MyCars>> pairs = new ArrayList<>();
Iterator<?> iterator = list.iterator();
while ( iterator.hasNext() ) {
Object[] tuple = (Object[]) iterator.next();
pairs.add(new Pair<Track, MyCars>((Track) tuple[0],(MyCars) tuple[1]));
}
and:
return gson.toJson(pairs);
Result is:
0: {track:{avgSpeed:78.62, customerId:124, distance:806.53, endDate:2014-06-30T18:20:04Z,…},…}
>my_cars: {carId:4444, currentMileage:139000, dateOfPurchase:16-Nov-2007, id:124, initialMileage:13,…}
>track: {avgSpeed:78.62, customerId:124, distance:806.53, endDate:2014-06-30T18:20:04Z,…}

Related

MySQL JSON_EXTRACT value of property based on criteria

Suppose a JSON column called blob in a MySQL 5.7 database table called "Thing" with the following content:
[
{
"id": 1,
"value": "blue"
},
{
"id": 2,
"value": "red"
}
]
Is it possible to select all records from Thing where the blob contains an object within the array where the id is some dynamic value and the value is also some dynamic value.
E.g. "give me all Things where the blob contains an object whose id is 2 and value is 'red'"
Not sure how to form the WHERE clause below:
SET #id = 2;
SET #value1 = 'red';
SET #value2 = 'blue';
-- with equals?
SELECT *
FROM Thing
WHERE JSON_EXTRACT(blob, '$[*].id ... equals #id ... and .value') = #value1;
-- with an IN clause?
SELECT *
FROM Thing
WHERE JSON_EXTRACT(blob, '$[*].id ... equals #id ... and .value') IN (#value1, #value2);
They said it couldn't be done. They told me I was a fool. Lo and behold, I have done it!
Here are some helper functions to teach Hibernate how to perform JSON functions against a MySQL 5.7 backend, and an example use case. It's confusing, for sure, but it works.
Context
This contrived example is of a Person entity which can have many BioDetails, which is a question/answer type (but is more involved than that). The example within below essentially is searching within two JSON payloads, grabbing JSON values from one to build JSON paths within which to search in the other. In the end, you can pass in a complex structure of AND'd or OR'd criteria, which will be applied against a JSON blob and return only the resulting rows which match.
E.g. give my all Person entities where their age is > 30 and their favorite color is blue or orange. Given that those key/value pairs are stored in a JSON blob, you can find those matched using the example code below.
JSON-search classes and example repo
Classes below use Lombok for brevity.
Classes to allow specification of search criteria
SearchCriteriaContainer
#Data
#EqualsAndHashCode
public class SearchCriteriaContainer
{
private List<SearchCriterion> criteria;
private boolean and;
}
SearchCriterion
#Data
#EqualsAndHashCode(callSuper = true)
public class SearchCriterion extends SearchCriteriaContainer
{
private String field;
private List<String> values;
private SearchOperator operator;
private boolean not = false;
}
SearchOperator
#RequiredArgsConstructor
public enum SearchOperator
{
EQUAL("="),
LESS_THAN("<"),
LESS_THAN_OR_EQUAL("<="),
GREATER_THAN(">"),
GREATER_THAN_OR_EQUAL(">="),
LIKE("like"),
IN("in"),
IS_NULL("is null");
private final String value;
#JsonCreator
public static SearchOperator fromValue(#NotBlank String value)
{
return Stream
.of(SearchOperator.values())
.filter(o -> o.getValue().equals(value))
.findFirst()
.orElseThrow(() ->
{
String message = String.format("Could not find %s with value: %s", SearchOperator.class.getName(), value);
return new IllegalArgumentException(message);
});
}
#JsonValue
public String getValue()
{
return this.value;
}
#Override
public String toString()
{
return value;
}
}
Helper class which is used to call JSON functions
#RequiredArgsConstructor
public class CriteriaBuilderHelper
{
private final CriteriaBuilder criteriaBuilder;
public Expression<String> concat(Expression<?>... values)
{
return criteriaBuilder.function("CONCAT", String.class, values);
}
public Expression<String> substringIndex(Expression<?> value, String delimiter, int count)
{
return substringIndex(value, criteriaBuilder.literal(delimiter), criteriaBuilder.literal(count));
}
public Expression<String> substringIndex(Expression<?> value, Expression<String> delimiter, Expression<Integer> count)
{
return criteriaBuilder.function("SUBSTRING_INDEX", String.class, value, delimiter, count);
}
public Expression<String> jsonUnquote(Expression<?> jsonValue)
{
return criteriaBuilder.function("JSON_UNQUOTE", String.class, jsonValue);
}
public Expression<String> jsonExtract(Expression<?> jsonDoc, Expression<?> path)
{
return criteriaBuilder.function("JSON_EXTRACT", String.class, jsonDoc, path);
}
public Expression<String> jsonSearchOne(Expression<?> jsonDoc, Expression<?> value, Expression<?>... paths)
{
return jsonSearch(jsonDoc, "one", value, paths);
}
public Expression<String> jsonSearch(Expression<?> jsonDoc, Expression<?> value, Expression<?>... paths)
{
return jsonSearch(jsonDoc, "all", value, paths);
}
public Expression<String> jsonSearch(Expression<?> jsonDoc, String oneOrAll, Expression<?> value, Expression<?>... paths)
{
if (!"one".equals(oneOrAll) && !"all".equals(oneOrAll))
{
throw new RuntimeException("Parameter 'oneOrAll' must be 'one' or 'all', not: " + oneOrAll);
}
else
{
final var expressions = new ArrayList<>(List.of(
jsonDoc,
criteriaBuilder.literal(oneOrAll),
value,
criteriaBuilder.nullLiteral(String.class)));
if (paths != null)
{
expressions.addAll(Arrays.asList(paths));
}
return criteriaBuilder.function("JSON_SEARCH", String.class, expressions.toArray(Expression[]::new));
}
}
}
Utility to turn SearchCriteria into MySQL JSON function calls
SearchHelper
public class SearchHelper
{
private static final Pattern pathSeparatorPattern = Pattern.compile("\\.");
public static String getKeyPart(String key)
{
return pathSeparatorPattern.split(key)[0];
}
public static String getPathPart(String key)
{
final var parts = pathSeparatorPattern.split(key);
final var path = new StringBuilder();
for (var i = 1; i < parts.length; i++)
{
if (i > 1)
{
path.append(".");
}
path.append(parts[i]);
}
return path.toString();
}
public static Optional<Predicate> getCriteriaPredicate(SearchCriteriaContainer container, CriteriaBuilder cb, Path<String> bioDetailJson, Path<String> personJson)
{
final var predicates = new ArrayList<Predicate>();
if (container != null && container.getCriteria() != null && container.getCriteria().size() > 0)
{
final var h = new CriteriaBuilderHelper(cb);
container.getCriteria().forEach(ac ->
{
final var groupingOnly = ac.getField() == null && ac.getOperator() == null;
// a criterion can be used for grouping other criterion, and might not have a field/operator/value
if (!groupingOnly)
{
final var key = getKeyPart(ac.getField());
final var path = getPathPart(ac.getField());
final var bioDetailQuestionKeyPathEx = h.jsonUnquote(h.jsonSearchOne(bioDetailJson, cb.literal(key), cb.literal("$[*].key")));
final var bioDetailQuestionIdPathEx = h.concat(h.substringIndex(bioDetailQuestionKeyPathEx, ".", 1), cb.literal(".id"));
final var questionIdEx = h.jsonUnquote(h.jsonExtract(bioDetailJson, bioDetailQuestionIdPathEx));
final var answerPathEx = h.substringIndex(h.jsonUnquote(h.jsonSearchOne(personJson, questionIdEx, cb.literal("$[*].questionId"))), ".", 1);
final var answerValuePathEx = h.concat(answerPathEx, cb.literal("." + path));
final var answerValueEx = h.jsonUnquote(h.jsonExtract(personJson, answerValuePathEx));
switch (ac.getOperator())
{
case IN:
{
final var inEx = cb.in(answerValueEx);
if (ac.getValues() == null || ac.getValues().size() == 0)
{
throw new RuntimeException("No values provided for 'IN' criteria for field: " + ac.getField());
}
else
{
ac.getValues().forEach(inEx::value);
}
predicates.add(inEx);
break;
}
case IS_NULL:
{
predicates.add(cb.isNull(answerValueEx));
break;
}
default:
{
if (ac.getValues() == null || ac.getValues().size() == 0)
{
throw new RuntimeException("No values provided for '" + ac.getOperator() + "' criteria for field: " + ac.getField());
}
else
{
ac.getValues().forEach(value ->
{
final var valueEx = cb.literal(value);
switch (ac.getOperator())
{
case EQUAL:
{
predicates.add(cb.equal(answerValueEx, valueEx));
break;
}
case LESS_THAN:
{
predicates.add(cb.lessThan(answerValueEx, valueEx));
break;
}
case LESS_THAN_OR_EQUAL:
{
predicates.add(cb.lessThanOrEqualTo(answerValueEx, valueEx));
break;
}
case GREATER_THAN:
{
predicates.add(cb.greaterThan(answerValueEx, valueEx));
break;
}
case GREATER_THAN_OR_EQUAL:
{
predicates.add(cb.greaterThanOrEqualTo(answerValueEx, valueEx));
break;
}
case LIKE:
{
predicates.add(cb.like(answerValueEx, valueEx));
break;
}
default:
throw new RuntimeException("Unsupported operator during snapshot search: " + ac.getOperator());
}
});
}
}
}
}
// iterate nested criteria
getAnswerCriteriaPredicate(ac, cb, bioDetailJson, personJson).ifPresent(predicates::add);
});
return Optional.of(container.isAnd()
? cb.and(predicates.toArray(Predicate[]::new))
: cb.or(predicates.toArray(Predicate[]::new)));
}
else
{
return Optional.empty();
}
}
}
Example JPA Specification repository / search method
ExampleRepository
#Repository
public interface PersonRepository extends JpaSpecificationExecutor<Person>
{
default Page<Person> search(PersonSearchDirective directive, Pageable pageable)
{
return findAll((person, query, cb) ->
{
final var bioDetail = person.join(Person_.bioDetail);
final var bioDetailJson = bioDetail.get(BioDetailEntity_.bioDetailJson);
final var personJson = person.get(Person_.personJson);
final var predicates = new ArrayList<>();
SearchHelper
.getCriteriaPredicate(directive.getSearchCriteria(), cb, bioDetailJson, personJson)
.ifPresent(predicates::add);
return cb.and(predicates.toArray(Predicate[]::new));
}, pageable);
}
}

sqflite + Flutter : map((e) => .... returns [Instance of Class]

I am currently using Sqflite with Flutter for a small app being developed.
My model Class for User is as follows:
class User {
static const tblUser = 'users';
static const colUserId = 'id';
static const colUserName = 'name';
static const colUserMail = 'mail';
static const colUserPhone = 'phone';
User({this.id, this.name, this.mail, this.phone});
int id;
String name;
String mail;
String phone;
User.fromMap(Map<String, dynamic> map) {
this.id = map[colUserId];
this.name = map[colUserName];
this.mail = map[colUserMail];
this.phone = map[colUserPhone];
}
Map<String, dynamic> toMap() {
var map = <String, dynamic>{
colUserName: name,
colUserMail: mail,
colUserPhone: phone
};
if (id != null) {
map[colUserId] = id;
}
return map;
}
}
In the database_helper class, I create the database and the tables, which work correctly:
class DatabaseHelper {
static const _databaseName = 'FinmanDatabase.db';
static const _databaseVersion = 1;
DatabaseHelper._();
static final DatabaseHelper instance = DatabaseHelper._();
Database _database;
Future<Database> get database async {
if (_database != null) return _database;
_database = await _initDatabase();
return _database;
}
_initDatabase() async {
Directory dbDirectory = await getApplicationDocumentsDirectory();
String dbpath = join(dbDirectory.path, _databaseName);
return await openDatabase(dbpath,
version: _databaseVersion, onCreate: _onCreateDB);
}
Future _onCreateDB(Database db, int version) async {
await db.execute('''
CREATE TABLE ${User.tblUser} (
${User.colUserId} INTEGER PRIMARY KEY AUTOINCREMENT,
${User.colUserName} TEXT NOT NULL,
${User.colUserMail} TEXT NOT NULL,
${User.colUserPhone} TEXT NOT NULL
)
''');
}}
However, when I try to fetch the Users to flutter, the program returns 'Instance of User' instead of the contents. The function to fetch the Users is as follows:
Future<List<User>> fetchAllUser() async {
Database db = await database;
List<Map> userslist = await db.query(User.tblUser);
int count = userslist.length;
print('Printing $userslist from DBHelper + Length: $count');
return userslist.length == 0 ? [] : userslist.map((e) => User.fromMap(e)).toList();
}
And here is how I am calling this in Flutter:
class _HomeState extends State<Home> {
User user = User();
List<User> _users;
String _dbExists;
DatabaseHelper _dbhelper;
int count = 0;
#override
void initState() {
super.initState();
setState(() {
_dbhelper = DatabaseHelper.instance;
});
_refreshUserList();
}
_refreshUserList() async {
List<User> x = await _dbhelper.fetchAllUser();
setState(() {
_users = x;
print(_users);
count = _users.length;
print(count);
if (count > 0) {
_dbExists = 'Database exists';
} else {
_dbExists = 'Create a new Database';
}
});
}}
While the print(count) returns 1 (which is the number of records in the User Table), print(_users) returns [Instance of User]??
Any help is appreciated.
when I try to fetch the Users to flutter, the program returns
'Instance of User' instead of the contents
Because x is List<User>.
To get the content, you can use for-loop
for(var i in x){
print(i.name); // it will print out the name
}

return message in linq

how to return a message in linq? please see my code below. my return type is list. please help me.
public List<Product> GetProductsByProductName(string storeId, string productName)
{
Authenticate();
int _storeId = Convert.ToInt32(storeId);
string message = "Item is not added to cart";
var _products = (from p in context.products.AsEnumerable()
where p.StoreId == _storeId && p.ProductName.Contains(productName) && p.ProductIsAvailable.Equals(true)
orderby p.ProductName
select
new Product()
{
ProductName = p.ProductName,
CategoryID = p.CategoryId,
QuantityPerUnit = p.ProductUnit,
UnitPrice = p.ProductPrice,
DiscountValue = p.DiscountValue,
DiscountType = p.DiscountType
}).ToList();
if (_products.Count > 0)
{
return _products;
}
else
{
return message.ToList();
}
}
you should consider throwing an exception.
instead of return meassage.toList try :
throw new Exception("Item is not added to cart");
public List<Product> GetProductsByProductName(string storeId, string productName)
{
...
if (_products.Count > 0)
{
return _products;
}
else
{
throw new Exception( "Item is not added to cart");
}
}
you can handle it outside where you call the GetProductsByProductName method
you can even define your own exception like ItemAddException : Exception ....
or you add a new out bool parameter that tells you if it worked, or an out string parameter for messages :)
public List<Product> GetProductsByProductName(string storeId, string productName, out string message)
{
...
if (_products.Count > 0)
{
return _products;
}
else
{
message = "Item is not added to cart";
return null; //check if caller can handle nulls ;)
}
}
so if the method was called
var l = GetProductsByProductName(storeId, productName);
you will now have to do
string message="";
var l = GetProductsByProductName(string storeId, string productName, out message);
if(String.IsNullOrEmpty(message)==false)
{
.... do stuff
}
or if you use the exception mehtod :
try
{
var l = GetProductsByProductName(storeId, productName);
}
catch(Excepion ex)
{
... do stuff
}

PrimeFaces 5.0 datatable filter case sensitive

In PrimeFaces 5.0, datatable filter is case sensitive. In Primefaces 4 the filter was not case sensitive. But now in 5.0 my app doesn't work.
DataTable Filtering v. 5.0.1
Filtering is case sensitive in 5.0, due to feedback it is now case insensitive. FilterEvent was also providing wrong information about the filters, it has been corrected as well.
http://blog.primefaces.org/?p=3184
You can use the filterFunction option, like this:
In XHTML:
<p:column ...
filterBy="#{car.name}"
filterFunction="#{carListView.filterByName}"
In View:
public boolean filterByName(Object value, Object filter, Locale locale) {
String filterText = (filter == null) ? null : filter.toString().trim();
if (filterText == null || filterText.equals("")) {
return true;
}
if (value == null) {
return false;
}
String carName = value.toString().toUpperCase();
filterText = filterText.toUpperCase();
if (carName.contains(filterText)) {
return true;
} else {
return false;
}
}
This worked for me. Please refer to: http://www.primefaces.org/showcase/ui/data/datatable/filter.xhtml (price column). And also page 153 at the PrimeFaces 5.0 manual (pdf).
I have been facing the same problem.
But I fix it replacing the filter class of primefaces.
1- create a package in you project: org.primefaces.component.datatable.feature
2 - create a class: FilterFeature
I've included this part on the class:
// FIX bug primefaces 5.0
// The filter should be case insensitive
if(columnValue != null && filterValue!= null){
columnValue = columnValue.toString().toUpperCase();
filterValue = filterValue.toString().toUpperCase();
}
Copy the contents of this class to your file.
FilterFeature.java
/*
* Copyright 2009-2014 PrimeTek.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.primefaces.component.datatable.feature;
import java.io.IOException;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ELContext;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import org.primefaces.component.api.UIColumn;
import javax.faces.component.UIComponent;
import javax.faces.component.UINamingContainer;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import org.primefaces.component.api.DynamicColumn;
import org.primefaces.component.column.Column;
import org.primefaces.component.columngroup.ColumnGroup;
import org.primefaces.component.datatable.DataTable;
import org.primefaces.component.datatable.DataTableRenderer;
import org.primefaces.component.row.Row;
import org.primefaces.context.RequestContext;
import org.primefaces.model.filter.*;
import org.primefaces.util.Constants;
public class FilterFeature implements DataTableFeature {
private final static Logger logger = Logger.getLogger(DataTable.class.getName());
private final static String STARTS_WITH_MATCH_MODE = "startsWith";
private final static String ENDS_WITH_MATCH_MODE = "endsWith";
private final static String CONTAINS_MATCH_MODE = "contains";
private final static String EXACT_MATCH_MODE = "exact";
private final static String LESS_THAN_MODE = "lt";
private final static String LESS_THAN_EQUALS_MODE = "lte";
private final static String GREATER_THAN_MODE = "gt";
private final static String GREATER_THAN_EQUALS_MODE = "gte";
private final static String EQUALS_MODE = "equals";
private final static String IN_MODE = "in";
private final static String GLOBAL_MODE = "global";
final static Map<String,FilterConstraint> FILTER_CONSTRAINTS;
static {
FILTER_CONSTRAINTS = new HashMap<String,FilterConstraint>();
FILTER_CONSTRAINTS.put(STARTS_WITH_MATCH_MODE, new StartsWithFilterConstraint());
FILTER_CONSTRAINTS.put(ENDS_WITH_MATCH_MODE, new EndsWithFilterConstraint());
FILTER_CONSTRAINTS.put(CONTAINS_MATCH_MODE, new ContainsFilterConstraint());
FILTER_CONSTRAINTS.put(EXACT_MATCH_MODE, new ExactFilterConstraint());
FILTER_CONSTRAINTS.put(LESS_THAN_MODE, new LessThanFilterConstraint());
FILTER_CONSTRAINTS.put(LESS_THAN_EQUALS_MODE, new LessThanEqualsFilterConstraint());
FILTER_CONSTRAINTS.put(GREATER_THAN_MODE, new GreaterThanFilterConstraint());
FILTER_CONSTRAINTS.put(GREATER_THAN_EQUALS_MODE, new GreaterThanEqualsFilterConstraint());
FILTER_CONSTRAINTS.put(EQUALS_MODE, new EqualsFilterConstraint());
FILTER_CONSTRAINTS.put(IN_MODE, new InFilterConstraint());
FILTER_CONSTRAINTS.put(GLOBAL_MODE, new GlobalFilterConstraint());
}
private boolean isFilterRequest(FacesContext context, DataTable table) {
return context.getExternalContext().getRequestParameterMap().containsKey(table.getClientId(context) + "_filtering");
}
public boolean shouldDecode(FacesContext context, DataTable table) {
return false;
}
public boolean shouldEncode(FacesContext context, DataTable table) {
return isFilterRequest(context, table);
}
public void decode(FacesContext context, DataTable table) {
String globalFilterParam = table.getClientId(context) + UINamingContainer.getSeparatorChar(context) + "globalFilter";
List<FilterMeta> filterMetadata = this.populateFilterMetaData(context, table);
Map<String,Object> filterParameterMap = this.populateFilterParameterMap(context, table, filterMetadata, globalFilterParam);
table.setFilters(filterParameterMap);
table.setFilterMetadata(filterMetadata);
}
public void encode(FacesContext context, DataTableRenderer renderer, DataTable table) throws IOException {
//reset state
updateFilteredValue(context, table, null);
table.setFirst(0);
table.setRowIndex(-1);
if(table.isLazy()) {
table.loadLazyData();
}
else {
String globalFilterParam = table.getClientId(context) + UINamingContainer.getSeparatorChar(context) + "globalFilter";
filter(context, table, table.getFilterMetadata(), globalFilterParam);
//sort new filtered data to restore sort state
boolean sorted = (table.getValueExpression("sortBy") != null || table.getSortBy() != null);
if(sorted) {
SortFeature sortFeature = (SortFeature) table.getFeature(DataTableFeatureKey.SORT);
if(table.isMultiSort())
sortFeature.multiSort(context, table);
else
sortFeature.singleSort(context, table);
}
}
renderer.encodeTbody(context, table, true);
}
private void filter(FacesContext context, DataTable table, List<FilterMeta> filterMetadata, String globalFilterParam) {
Map<String,String> params = context.getExternalContext().getRequestParameterMap();
List filteredData = new ArrayList();
Locale filterLocale = table.resolveDataLocale();
boolean hasGlobalFilter = params.containsKey(globalFilterParam);
String globalFilterValue = hasGlobalFilter ? params.get(globalFilterParam): null;
GlobalFilterConstraint globalFilterConstraint = (GlobalFilterConstraint) FILTER_CONSTRAINTS.get(GLOBAL_MODE);
ELContext elContext = context.getELContext();
for(int i = 0; i < table.getRowCount(); i++) {
table.setRowIndex(i);
boolean localMatch = true;
boolean globalMatch = false;
for(FilterMeta filterMeta : filterMetadata) {
Object filterValue = filterMeta.getFilterValue();
UIColumn column = filterMeta.getColumn();
MethodExpression filterFunction = column.getFilterFunction();
ValueExpression filterByVE = filterMeta.getFilterByVE();
if(column instanceof DynamicColumn) {
((DynamicColumn) column).applyStatelessModel();
}
Object columnValue = filterByVE.getValue(elContext);
FilterConstraint filterConstraint = this.getFilterConstraint(column);
// FIX bug primefaces 5.0
// The filter should be case insensitive
if(columnValue != null && filterValue!= null){
columnValue = columnValue.toString().toUpperCase();
filterValue = filterValue.toString().toUpperCase();
}
if(hasGlobalFilter && !globalMatch) {
globalMatch = globalFilterConstraint.applies(columnValue, globalFilterValue, filterLocale);
}
if(filterFunction != null) {
localMatch = (Boolean) filterFunction.invoke(elContext, new Object[]{columnValue, filterValue, filterLocale});
}
else if(!filterConstraint.applies(columnValue, filterValue, filterLocale)) {
localMatch = false;
}
if(!localMatch) {
break;
}
}
boolean matches = localMatch;
if(hasGlobalFilter) {
matches = localMatch && globalMatch;
}
if(matches) {
filteredData.add(table.getRowData());
}
}
//Metadata for callback
if(table.isPaginator()) {
RequestContext requestContext = RequestContext.getCurrentInstance();
if(requestContext != null) {
requestContext.addCallbackParam("totalRecords", filteredData.size());
}
}
//save filtered data
updateFilteredValue(context, table, filteredData);
table.setRowIndex(-1); //reset datamodel
}
public void updateFilteredValue(FacesContext context, DataTable table, List<?> value) {
table.setSelectableDataModelWrapper(null);
ValueExpression ve = table.getValueExpression("filteredValue");
if(ve != null) {
ve.setValue(context.getELContext(), value);
}
else {
if(value != null) {
logger.log(Level.WARNING, "DataTable {0} has filtering enabled but no filteredValue model reference is defined"
+ ", for backward compatibility falling back to page viewstate method to keep filteredValue."
+ " It is highly suggested to use filtering with a filteredValue model reference as viewstate method is deprecated and will be removed in future."
, new Object[]{table.getClientId(context)});
}
table.setFilteredValue(value);
}
}
private Map<String,Object> populateFilterParameterMap(FacesContext context, DataTable table, List<FilterMeta> filterMetadata, String globalFilterParam) {
Map<String,String> params = context.getExternalContext().getRequestParameterMap();
Map<String,Object> filterParameterMap = new HashMap<String, Object>();
for(FilterMeta filterMeta : filterMetadata) {
Object filterValue = filterMeta.getFilterValue();
UIColumn column = filterMeta.getColumn();
if(filterValue != null && !filterValue.toString().trim().equals(Constants.EMPTY_STRING)) {
String filterField = null;
ValueExpression filterByVE = column.getValueExpression("filterBy");
if(column.isDynamic()) {
((DynamicColumn) column).applyStatelessModel();
Object filterByProperty = column.getFilterBy();
String field = column.getField();
if(field == null)
filterField = (filterByProperty == null) ? table.resolveDynamicField(filterByVE) : filterByProperty.toString();
else
filterField = field;
}
else {
String field = column.getField();
if(field == null)
filterField = (filterByVE == null) ? (String) column.getFilterBy(): table.resolveStaticField(filterByVE);
else
filterField = field;
}
filterParameterMap.put(filterField, filterValue);
}
}
if(params.containsKey(globalFilterParam)) {
filterParameterMap.put("globalFilter", params.get(globalFilterParam));
}
return filterParameterMap;
}
private List<FilterMeta> populateFilterMetaData(FacesContext context, DataTable table) {
List<FilterMeta> filterMetadata = new ArrayList<FilterMeta>();
String separator = String.valueOf(UINamingContainer.getSeparatorChar(context));
String var = table.getVar();
Map<String,String> params = context.getExternalContext().getRequestParameterMap();
ColumnGroup group = getColumnGroup(table, "header");
if(group != null) {
for(UIComponent child : group.getChildren()) {
Row headerRow = (Row) child;
if(headerRow.isRendered()) {
for(UIComponent headerRowChild : headerRow.getChildren()) {
Column column = (Column) headerRowChild;
if(column.isRendered()) {
ValueExpression columnFilterByVE = column.getValueExpression("filterBy");
Object filterByProperty = column.getFilterBy();
if(columnFilterByVE != null || filterByProperty != null) {
ValueExpression filterByVE = (columnFilterByVE != null) ? columnFilterByVE : createFilterByVE(context, var, filterByProperty);
UIComponent filterFacet = column.getFacet("filter");
Object filterValue;
if(filterFacet == null)
filterValue = params.get(column.getClientId(context) + separator + "filter");
else
filterValue = ((ValueHolder) filterFacet).getLocalValue();
filterMetadata.add(new FilterMeta(column, filterByVE, filterValue));
}
}
}
}
}
}
else {
for(UIColumn column : table.getColumns()) {
ValueExpression columnFilterByVE = column.getValueExpression("filterBy");
Object filterByProperty = column.getFilterBy();
if (columnFilterByVE != null || filterByProperty != null) {
UIComponent filterFacet = column.getFacet("filter");
Object filterValue = null;
ValueExpression filterByVE = null;
String filterId = null;
if(column instanceof Column) {
filterByVE = (columnFilterByVE != null) ? columnFilterByVE : createFilterByVE(context, var, filterByProperty);
filterId = column.getClientId(context) + separator + "filter";
}
else if(column instanceof DynamicColumn) {
DynamicColumn dynamicColumn = (DynamicColumn) column;
dynamicColumn.applyStatelessModel();
filterByProperty = column.getFilterBy();
filterByVE = (filterByProperty == null) ? columnFilterByVE : createFilterByVE(context, var, filterByProperty);
filterId = dynamicColumn.getContainerClientId(context) + separator + "filter";
dynamicColumn.cleanStatelessModel();
}
if(filterFacet == null)
filterValue = params.get(filterId);
else
filterValue = ((ValueHolder) filterFacet).getLocalValue();
filterMetadata.add(new FilterMeta(column, filterByVE, filterValue));
}
}
}
return filterMetadata;
}
private ColumnGroup getColumnGroup(DataTable table, String target) {
for(UIComponent child : table.getChildren()) {
if(child instanceof ColumnGroup) {
ColumnGroup colGroup = (ColumnGroup) child;
String type = colGroup.getType();
if(type != null && type.equals(target)) {
return colGroup;
}
}
}
return null;
}
public FilterConstraint getFilterConstraint(UIColumn column) {
String filterMatchMode = column.getFilterMatchMode();
FilterConstraint filterConstraint = FILTER_CONSTRAINTS.get(filterMatchMode);
if(filterConstraint == null) {
throw new FacesException("Illegal filter match mode:" + filterMatchMode);
}
return filterConstraint;
}
private ValueExpression createFilterByVE(FacesContext context, String var, Object filterBy) {
ELContext elContext = context.getELContext();
return context.getApplication().getExpressionFactory().createValueExpression(elContext, "#{" + var + "." + filterBy + "}", Object.class);
}
private class FilterMeta {
private UIColumn column;
private ValueExpression filterByVE;
private Object filterValue;
public FilterMeta(UIColumn column, ValueExpression filterByVE, Object filterValue) {
this.column = column;
this.filterByVE = filterByVE;
this.filterValue = filterValue;
}
public UIColumn getColumn() {
return column;
}
public ValueExpression getFilterByVE() {
return filterByVE;
}
public Object getFilterValue() {
return filterValue;
}
}
}
I took a little more simplistic approach to get past this in my situation.
In my XHTML:
<p:column filterBy="#{car.nameLowercase}" sortBy="#{car.name}"
filterMatchMode="contains">
<h:outputText value="#{car.name}"/>
</p:column>
In my car bean I simply add a getter:
public String getNameLowerCase() {
if (name == null) {
return null;
}
return name.toLowerCase();
}
This seems to work for my purposes. Hope it will help you!
I had same issue on the Lazy.xhtml, I fixied it by go to the LazyCarDataModel.java, on load method, change
if(filterValue==null ||
fieldvalue.startswith(filtervalue.toString()))
to
if(filterValue==null ||
fieldvalue.startswith(filtervalue.toString().toLowerCase() ||
fieldvalue.startswith(filtervalue.toString().toUpperCase()) )

Jackson JSON processor overwrites properties of object during deserialization

I have interesting problem. Jackson overwrites values of properties on the 'parent' object with values of properties of 'child' object that have same name. So, to be more precise, this is Java structure I have
public class Contact {
...
String name;
List<Email> emails;
List<PhoneNumbers> phoneNumbers;
Account account;
...
}
public class Account {
...
String accountName;
List<Email> emails;
List<PhoneNumbers> phoneNumbers;
Account account;
...
}
So, when I form Contact JSON object and send it to server, everything goes fine until BeanDeserializer comes into account property of Contact class. Then, it starts reading proeprties of account part of JSON, which is ok, but does not create Account instance to set it on contact - it writes values of account's properties into properties with same names of Contact instance.
I am confused and not sure where to start looking how to fix this.
I'm not able to reproduce any problem similar to what's described in the original question.
The following example, created based on the descriptions in the original question, works as expected, without errors or improper deserialization.
import java.util.LinkedList;
import java.util.List;
import org.codehaus.jackson.annotate.JsonAutoDetect.Visibility;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;
public class JacksonFoo
{
public static void main(String[] args) throws Exception
{
Account account1 = new Account();
account1.accountName = "account 1";
account1.emails = new LinkedList<Email>();
account1.emails.add(new Email("email_11#google.com"));
account1.emails.add(new Email("email_12#google.com"));
account1.phoneNumbers = new LinkedList<PhoneNumbers>();
account1.phoneNumbers.add(new PhoneNumbers(1111, 1112));
account1.phoneNumbers.add(new PhoneNumbers(1113, 1114));
Account account2 = new Account();
account2.accountName = "account 2";
account2.emails = new LinkedList<Email>();
account2.emails.add(new Email("email_21#google.com"));
account2.emails.add(new Email("email_22#google.com"));
account2.phoneNumbers = new LinkedList<PhoneNumbers>();
account2.phoneNumbers.add(new PhoneNumbers(2221, 2222));
account2.phoneNumbers.add(new PhoneNumbers(2223, 2224));
account2.account = account1;
Contact contact = new Contact();
contact.name = "contact";
contact.emails = new LinkedList<Email>();
contact.emails.add(new Email("email_31#google.com"));
contact.emails.add(new Email("email_32#google.com"));
contact.phoneNumbers = new LinkedList<PhoneNumbers>();
contact.phoneNumbers.add(new PhoneNumbers(3331, 3332));
contact.phoneNumbers.add(new PhoneNumbers(3333, 3334));
contact.account = account2;
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibilityChecker(
mapper.getVisibilityChecker()
.withFieldVisibility(Visibility.ANY));
String account1Json = mapper.writeValueAsString(account1);
String account2Json = mapper.writeValueAsString(account2);
String contactJson = mapper.writeValueAsString(contact);
System.out.println(account1Json); // {"accountName":"account 1","emails":[{"email":"email_11#google.com"},{"email":"email_12#google.com"}],"phoneNumbers":[{"phone1":1111,"phone2":1112},{"phone1":1113,"phone2":1114}],"account":null}
System.out.println(account2Json); // {"accountName":"account 2","emails":[{"email":"email_21#google.com"},{"email":"email_22#google.com"}],"phoneNumbers":[{"phone1":2221,"phone2":2222},{"phone1":2223,"phone2":2224}],"account":{"accountName":"account 1","emails":[{"email":"email_11#google.com"},{"email":"email_12#google.com"}],"phoneNumbers":[{"phone1":1111,"phone2":1112},{"phone1":1113,"phone2":1114}],"account":null}}
System.out.println(contactJson); // {"name":"contact","emails":[{"email":"email_31#google.com"},{"email":"email_32#google.com"}],"phoneNumbers":[{"phone1":3331,"phone2":3332},{"phone1":3333,"phone2":3334}],"account":{"accountName":"account 2","emails":[{"email":"email_21#google.com"},{"email":"email_22#google.com"}],"phoneNumbers":[{"phone1":2221,"phone2":2222},{"phone1":2223,"phone2":2224}],"account":{"accountName":"account 1","emails":[{"email":"email_11#google.com"},{"email":"email_12#google.com"}],"phoneNumbers":[{"phone1":1111,"phone2":1112},{"phone1":1113,"phone2":1114}],"account":null}}}
Account account1Copy = mapper.readValue(account1Json, Account.class);
Account account2Copy = mapper.readValue(account2Json, Account.class);
Contact contactCopy = mapper.readValue(contactJson, Contact.class);
System.out.println(account1.equals(account1Copy)); // true
System.out.println(account2.equals(account2Copy)); // true
System.out.println(contact.equals(contactCopy)); // true
}
}
class Contact
{
String name;
List<Email> emails;
List<PhoneNumbers> phoneNumbers;
Account account;
#Override
public boolean equals(Object o)
{
Contact c = (Contact) o;
if (name.equals(c.name))
if (emails.containsAll(c.emails))
if (c.emails.containsAll(emails))
if (phoneNumbers.containsAll(c.phoneNumbers))
if (c.phoneNumbers.containsAll(phoneNumbers))
return account.equals(c.account);
return false;
}
}
class Account
{
String accountName;
List<Email> emails;
List<PhoneNumbers> phoneNumbers;
Account account;
#Override
public boolean equals(Object o)
{
Account a = (Account) o;
if (accountName.equals(a.accountName))
if (emails.containsAll(a.emails))
if (a.emails.containsAll(emails))
if (phoneNumbers.containsAll(a.phoneNumbers))
if (a.phoneNumbers.containsAll(phoneNumbers))
if (account != null && a.account != null)
return account.equals(a.account);
else if (account == null && a.account == null)
return true;
return false;
}
}
class Email
{
String email;
#JsonCreator
Email(#JsonProperty("email") String e) {email = e;}
#Override
public boolean equals(Object o)
{
Email e = (Email) o;
return email.equals(e.email);
}
}
class PhoneNumbers
{
long phone1;
long phone2;
#JsonCreator
PhoneNumbers(#JsonProperty("phone1") long p1, #JsonProperty("phone2")long p2) {phone1 = p1; phone2 = p2;}
#Override
public boolean equals(Object o)
{
PhoneNumbers p = (PhoneNumbers) o;
return phone1 == p.phone1 && phone2 == p.phone2;
}
}