BAEL-19947: Migrate gson module to the com.baeldung package

gson/src/main/java/com/baeldung/gson/entities/ActorGson.java

@@ -0,0 +1,57 @@
+package com.baeldung.gson.entities;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.List;
+import java.util.TimeZone;
+
+public class ActorGson {
+
+    private String imdbId;
+    private Date dateOfBirth;
+    private List<String> filmography;
+
+    public ActorGson(String imdbId, Date dateOfBirth, List<String> filmography) {
+        super();
+        this.imdbId = imdbId;
+        this.dateOfBirth = dateOfBirth;
+        this.filmography = filmography;
+    }
+
+    @Override
+    public String toString() {
+        return "ActorGson [imdbId=" + imdbId + ", dateOfBirth=" + formatDateOfBirth() + ", filmography=" + filmography + "]";
+    }
+
+    public String getImdbId() {
+        return imdbId;
+    }
+
+    public void setImdbId(String imdbId) {
+        this.imdbId = imdbId;
+    }
+
+    public Date getDateOfBirth() {
+        return dateOfBirth;
+    }
+
+    public void setDateOfBirth(Date dateOfBirth) {
+        this.dateOfBirth = dateOfBirth;
+    }
+
+    public List<String> getFilmography() {
+        return filmography;
+    }
+
+    public void setFilmography(List<String> filmography) {
+        this.filmography = filmography;
+    }
+
+    private String formatDateOfBirth() {
+        final DateFormat formatter = new SimpleDateFormat("EEE MMM dd hh:mm:ss zzz yyyy");
+        formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
+        return formatter.format(dateOfBirth);
+    }
+
+}

gson/src/main/java/com/baeldung/gson/entities/Animal.java

@@ -0,0 +1,5 @@
+package com.baeldung.gson.entities;
+
+public abstract class Animal {
+    public String type = "Animal";
+}

gson/src/main/java/com/baeldung/gson/entities/Cow.java

@@ -0,0 +1,19 @@
+package com.baeldung.gson.entities;
+
+public class Cow extends Animal {
+    private String breed;
+
+    public Cow() {
+        breed = "Jersey";
+        type = "Cow";
+    }
+
+    public String getBreed() {
+        return breed;
+    }
+
+    public void setBreed(String breed) {
+        this.breed = breed;
+    }
+}
+

gson/src/main/java/com/baeldung/gson/entities/Dog.java

@@ -0,0 +1,18 @@
+package com.baeldung.gson.entities;
+
+public class Dog extends Animal {
+    private String petName;
+
+    public Dog() {
+        petName = "Milo";
+        type = "Dog";
+    }
+
+    public String getPetName() {
+        return petName;
+    }
+
+    public void setPetName(String petName) {
+        this.petName = petName;
+    }
+}

gson/src/main/java/com/baeldung/gson/entities/Employee.java

@@ -0,0 +1,36 @@
+package com.baeldung.gson.entities;
+
+public class Employee {
+    private int id;
+    private String name;
+    private String address;
+
+    public Employee(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+}

gson/src/main/java/com/baeldung/gson/entities/Movie.java

@@ -0,0 +1,48 @@
+package com.baeldung.gson.entities;
+
+import java.util.List;
+
+public class Movie {
+
+    private String imdbId;
+    private String director;
+    private List<ActorGson> actors;
+
+    public Movie(String imdbID, String director, List<ActorGson> actors) {
+        super();
+        this.imdbId = imdbID;
+        this.director = director;
+        this.actors = actors;
+    }
+
+    @Override
+    public String toString() {
+        return "Movie [imdbId=" + imdbId + ", director=" + director + ", actors=" + actors + "]";
+    }
+
+    public String getImdbID() {
+        return imdbId;
+    }
+
+    public void setImdbID(String imdbID) {
+        this.imdbId = imdbID;
+    }
+
+    public String getDirector() {
+        return director;
+    }
+
+    public void setDirector(String director) {
+        this.director = director;
+    }
+
+    public List<ActorGson> getActors() {
+        return actors;
+    }
+
+    public void setActors(List<ActorGson> actors) {
+        this.actors = actors;
+    }
+
+
+}

gson/src/main/java/com/baeldung/gson/entities/MovieWithNullValue.java

@@ -0,0 +1,46 @@
+package com.baeldung.gson.entities;
+
+import com.google.gson.annotations.Expose;
+
+import java.util.List;
+
+public class MovieWithNullValue {
+
+    @Expose
+    private String imdbId;
+    private String director;
+
+    @Expose
+    private List<ActorGson> actors;
+
+    public MovieWithNullValue(String imdbID, String director, List<ActorGson> actors) {
+        super();
+        this.imdbId = imdbID;
+        this.director = director;
+        this.actors = actors;
+    }
+
+    public String getImdbID() {
+        return imdbId;
+    }
+
+    public void setImdbID(String imdbID) {
+        this.imdbId = imdbID;
+    }
+
+    public String getDirector() {
+        return director;
+    }
+
+    public void setDirector(String director) {
+        this.director = director;
+    }
+
+    public List<ActorGson> getActors() {
+        return actors;
+    }
+
+    public void setActors(List<ActorGson> actors) {
+        this.actors = actors;
+    }
+}

gson/src/main/java/com/baeldung/gson/entities/MyClass.java

@@ -0,0 +1,49 @@
+package com.baeldung.gson.entities;
+
+import java.util.Objects;
+
+public class MyClass {
+    private int id;
+    private String name;
+
+    public MyClass(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public MyClass() { }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        MyClass myClass = (MyClass) o;
+        return id == myClass.id && Objects.equals(name, myClass.name);
+    }
+
+    @Override
+    public int hashCode() {
+
+        return Objects.hash(id, name);
+    }
+}

gson/src/main/java/com/baeldung/gson/entities/User.java

@@ -0,0 +1,19 @@
+package com.baeldung.gson.entities;
+
+public class User {
+
+	private int id;
+	private String name;
+	private transient String nationality;
+
+	public User(int id, String name, String nationality) {
+		this.id = id;
+		this.name = name;
+		this.nationality = nationality;
+	}
+
+	public User(int id, String name) {
+		this(id, name, null);
+	}
+
+}

gson/src/main/java/com/baeldung/gson/entities/Weather.java

@@ -0,0 +1,40 @@
+package com.baeldung.gson.entities;
+
+import com.google.gson.annotations.SerializedName;
+
+public class Weather {
+
+    @SerializedName(value = "location", alternate = "place")
+    private String location;
+
+    @SerializedName(value = "temp", alternate = "temperature")
+    private int temp;
+
+    @SerializedName(value = "outlook", alternate = "weather")
+    private String outlook;
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    public int getTemp() {
+        return temp;
+    }
+
+    public void setTemp(int temp) {
+        this.temp = temp;
+    }
+
+    public String getOutlook() {
+        return outlook;
+    }
+
+    public void setOutlook(String outlook) {
+        this.outlook = outlook;
+    }
+
+}

gson/src/main/java/com/baeldung/gson/primitives/models/BooleanExample.java

@@ -0,0 +1,9 @@
+package com.baeldung.gson.primitives.models;
+
+public class BooleanExample {
+    public boolean value;
+
+    public String toString() {
+        return "{boolean: " + value + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/ByteExample.java

@@ -0,0 +1,9 @@
+package com.baeldung.gson.primitives.models;
+
+public class ByteExample {
+    public byte value = (byte) 1;
+
+    public String toString() {
+        return "{byte: " + value + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/CharExample.java

@@ -0,0 +1,9 @@
+package com.baeldung.gson.primitives.models;
+
+public class CharExample {
+    public char value;
+
+    public String toString() {
+        return "{char: " + value + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/DoubleExample.java

@@ -0,0 +1,9 @@
+package com.baeldung.gson.primitives.models;
+
+public class DoubleExample {
+    public double value;
+
+    public String toString() {
+        return "{float: " + value + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/FloatExample.java

@@ -0,0 +1,9 @@
+package com.baeldung.gson.primitives.models;
+
+public class FloatExample {
+    public float value;
+
+    public String toString() {
+        return "{float: " + value + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/InfinityValuesExample.java

@@ -0,0 +1,6 @@
+package com.baeldung.gson.primitives.models;
+
+public class InfinityValuesExample {
+    public float negativeInfinity;
+    public float positiveInfinity;
+}

gson/src/main/java/com/baeldung/gson/primitives/models/LongExample.java

@@ -0,0 +1,9 @@
+package com.baeldung.gson.primitives.models;
+
+public class LongExample {
+    public long value = 1;
+
+    public String toString() {
+        return "{byte: " + value + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/PrimitiveBundle.java

@@ -0,0 +1,19 @@
+package com.baeldung.gson.primitives.models;
+
+public class PrimitiveBundle {
+    public byte byteValue;
+    public short shortValue;
+    public int intValue;
+    public long longValue;
+    public float floatValue;
+    public double doubleValue;
+    public boolean booleanValue;
+    public char charValue;
+
+    public String toString() {
+        return "{" + "byte: " + byteValue + ", " + "short: " + shortValue + ", "
+            + "int: " + intValue + ", " + "long: " + longValue + ", "
+            + "float: " + floatValue + ", " + "double: " + doubleValue + ", "
+            + "boolean: " + booleanValue + ", " + "char: " + charValue + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/primitives/models/PrimitiveBundleInitialized.java

@@ -0,0 +1,18 @@
+package com.baeldung.gson.primitives.models;
+
+public class PrimitiveBundleInitialized {
+    // @formatter:off
+    public byte byteValue       = (byte) 1;
+    public short shortValue     = (short) 1;
+    public int intValue         = 1;
+    public long longValue       = 1L;
+    public float floatValue     = 1.0f;
+    public double doubleValue   = 1;
+    // @formatter:on
+
+    public String toString() {
+        return "{" + "byte: " + byteValue + ", " + "short: " + shortValue + ", "
+            + "int: " + intValue + ", " + "long: " + longValue + ", "
+            + "float: " + floatValue + ", " + "double: " + doubleValue + "}";
+    }
+}

gson/src/main/java/com/baeldung/gson/serialization/ActorGsonDeserializer.java

@@ -0,0 +1,46 @@
+package com.baeldung.gson.serialization;
+
+import java.lang.reflect.Type;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+
+import com.baeldung.gson.entities.ActorGson;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+
+public class ActorGsonDeserializer implements JsonDeserializer<ActorGson> {
+
+    private final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
+
+    @Override
+    public ActorGson deserialize(JsonElement json, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
+
+        final JsonObject jsonObject = json.getAsJsonObject();
+
+        final JsonElement jsonImdbId = jsonObject.get("imdbId");
+        final JsonElement jsonDateOfBirth = jsonObject.get("dateOfBirth");
+        final JsonArray jsonFilmography = jsonObject.getAsJsonArray("filmography");
+
+        final ArrayList<String> filmList = new ArrayList<String>();
+        if (jsonFilmography != null) {
+            for (int i = 0; i < jsonFilmography.size(); i++) {
+                filmList.add(jsonFilmography.get(i).getAsString());
+            }
+        }
+
+        ActorGson actorGson = null;
+        try {
+            actorGson = new ActorGson(jsonImdbId.getAsString(), sdf.parse(jsonDateOfBirth.getAsString()), filmList);
+        } catch (final ParseException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+        return actorGson;
+    }
+}

gson/src/main/java/com/baeldung/gson/serialization/ActorGsonSerializer.java

@@ -0,0 +1,33 @@
+package com.baeldung.gson.serialization;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import com.baeldung.gson.entities.ActorGson;
+
+import java.lang.reflect.Type;
+import java.text.SimpleDateFormat;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ActorGsonSerializer implements JsonSerializer<ActorGson> {
+
+    private SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
+
+    @Override
+    public JsonElement serialize(ActorGson actor, Type type, JsonSerializationContext jsonSerializationContext) {
+
+        JsonObject actorJsonObj = new JsonObject();
+        actorJsonObj.addProperty("<strong>IMDB Code</strong>", actor.getImdbId());
+        actorJsonObj.addProperty("<strong>Date Of Birth</strong>", actor.getDateOfBirth() != null ? sdf.format(actor.getDateOfBirth()) : null);
+        actorJsonObj.addProperty("<strong>N° Film:</strong> ", actor.getFilmography() != null ? actor.getFilmography().size() : null);
+        actorJsonObj.addProperty("filmography", actor.getFilmography() != null ? convertFilmography(actor.getFilmography()) : null);
+
+        return actorJsonObj;
+    }
+
+    private String convertFilmography(List<String> filmography) {
+        return filmography.stream().collect(Collectors.joining("-"));
+    }
+}

gson/src/main/java/com/baeldung/gson/serialization/AnimalDeserializer.java

@@ -0,0 +1,35 @@
+package com.baeldung.gson.serialization;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.Map;
+import com.baeldung.gson.entities.Animal;
+
+public class AnimalDeserializer implements JsonDeserializer<Animal> {
+    private String animalTypeElementName;
+    private Gson gson;
+    private Map<String, Class<? extends Animal>> animalTypeRegistry;
+
+    public AnimalDeserializer(String animalTypeElementName) {
+        this.animalTypeElementName = animalTypeElementName;
+        this.gson = new Gson();
+        this.animalTypeRegistry = new HashMap<>();
+    }
+
+    public void registerBarnType(String animalTypeName, Class<? extends Animal> animalType) {
+        animalTypeRegistry.put(animalTypeName, animalType);
+    }
+
+    public Animal deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
+        JsonObject animalObject = json.getAsJsonObject();
+        JsonElement animalTypeElement = animalObject.get(animalTypeElementName);
+
+        Class<? extends Animal> animalType = animalTypeRegistry.get(animalTypeElement.getAsString());
+        return gson.fromJson(animalObject, animalType);
+    }
+}

gson/src/main/java/com/baeldung/gson/serialization/MapDeserializer.java

@@ -0,0 +1,63 @@
+package com.baeldung.gson.serialization;
+
+import java.lang.reflect.Type;
+import java.math.BigDecimal;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import com.baeldung.gson.entities.Employee;
+
+import com.google.gson.*;
+
+public class MapDeserializer implements JsonDeserializer<Map<String, Object>> {
+
+    @Override
+    public Map<String, Object> deserialize(JsonElement elem, Type type, JsonDeserializationContext context) throws JsonParseException {
+
+        return elem.getAsJsonObject()
+          .entrySet()
+          .stream()
+          .collect(Collectors.toMap(
+            Map.Entry::getKey,
+            e -> e.getValue().isJsonPrimitive() ?
+              toPrimitive(e.getValue().getAsJsonPrimitive(), context)
+              : context.deserialize(e.getValue(), Employee.class)
+          ));
+    }
+
+    private Object toPrimitive(JsonPrimitive jsonValue, JsonDeserializationContext context) {
+        if (jsonValue.isBoolean())
+            return jsonValue.getAsBoolean();
+        else if (jsonValue.isString())
+            return jsonValue.getAsString();
+        else {
+            BigDecimal bigDec = jsonValue.getAsBigDecimal();
+            Long l;
+            Integer i;
+            if ((i = toInteger(bigDec)) != null) {
+                return i;
+            } else if ((l = toLong(bigDec)) != null) {
+                return l;
+            } else {
+                return bigDec.doubleValue();
+            }
+        }
+    }
+
+    private Long toLong(BigDecimal val) {
+        try {
+            return val.toBigIntegerExact().longValue();
+        } catch (ArithmeticException e) {
+            return null;
+        }
+    }
+
+    private Integer toInteger(BigDecimal val) {
+        try {
+            return val.intValueExact();
+        } catch (ArithmeticException e) {
+            return null;
+        }
+    }
+
+}

gson/src/main/java/com/baeldung/gson/serialization/StringDateMapDeserializer.java

@@ -0,0 +1,44 @@
+package com.baeldung.gson.serialization;
+
+import java.lang.reflect.Type;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+
+public class StringDateMapDeserializer implements JsonDeserializer<Map<String, Date>> {
+
+    private static final Logger logger = LoggerFactory.getLogger(StringDateMapDeserializer.class);
+
+    private SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");
+
+    @Override
+    public Map<String, Date> deserialize(JsonElement elem, Type type, JsonDeserializationContext jsonDeserializationContext) {
+        System.out.println("Deserializer called");
+        logger.info("Deserializer called");
+        return elem.getAsJsonObject()
+          .entrySet()
+          .stream()
+          .filter(e -> e.getValue().isJsonPrimitive())
+          .filter(e -> e.getValue().getAsJsonPrimitive().isString())
+          .collect(Collectors.toMap(Map.Entry::getKey, e -> formatDate(e.getValue())));
+    }
+
+    private Date formatDate(JsonElement value) {
+        try {
+            return format.parse(value.getAsString());
+        } catch (ParseException ex) {
+            throw new JsonParseException(ex);
+        }
+    }
+
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/Exclude.java

@@ -0,0 +1,11 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface Exclude {
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MyClass.java

@@ -0,0 +1,13 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MyClass {
+    private long id;
+    private String name;
+    private String other;
+    private MySubClass subclass;
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MyClassWithAnnotatedFields.java

@@ -0,0 +1,20 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import com.google.gson.annotations.Expose;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MyClassWithAnnotatedFields {
+
+    @Expose
+    private long id;
+    @Expose
+    private String name;
+    private String other;
+    @Expose
+    private MySubClassWithAnnotatedFields subclass;
+
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MyClassWithCustomAnnotatedFields.java

@@ -0,0 +1,16 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MyClassWithCustomAnnotatedFields {
+
+    private long id;
+    private String name;
+    @Exclude
+    private String other;
+    private MySubClassWithCustomAnnotatedFields subclass;
+
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MyClassWithTransientFields.java

@@ -0,0 +1,15 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MyClassWithTransientFields {
+
+    private long id;
+    private String name;
+    private transient String other;
+    private MySubClassWithTransientFields subclass;
+
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MySubClass.java

@@ -0,0 +1,12 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MySubClass {
+    private long id;
+    private String description;
+    private String otherVerboseInfo;
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MySubClassWithAnnotatedFields.java

@@ -0,0 +1,15 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import com.google.gson.annotations.Expose;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MySubClassWithAnnotatedFields {
+
+    @Expose private long id;
+    @Expose private String description;
+    private String otherVerboseInfo;
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MySubClassWithCustomAnnotatedFields.java

@@ -0,0 +1,14 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MySubClassWithCustomAnnotatedFields {
+
+    private long id;
+    private String description;
+    @Exclude 
+    private String otherVerboseInfo;
+}

gson/src/main/java/com/baeldung/gson/serializationwithexclusions/MySubClassWithTransientFields.java

@@ -0,0 +1,13 @@
+package com.baeldung.gson.serializationwithexclusions;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class MySubClassWithTransientFields {
+
+    private long id;
+    private String description;
+    private transient String otherVerboseInfo;
+}