GsonObjectSerializer.java

1 
package com.reallifedeveloper.common.infrastructure;
2
3 
import java.io.IOException;
4 
import java.lang.reflect.Type;
5 
import java.time.LocalDate;
6 
import java.time.LocalDateTime;
7 
import java.time.ZonedDateTime;
8 
import java.time.format.DateTimeFormatter;
9
10 
import com.google.gson.Gson;
11 
import com.google.gson.GsonBuilder;
12 
import com.google.gson.JsonDeserializationContext;
13 
import com.google.gson.JsonDeserializer;
14 
import com.google.gson.JsonElement;
15 
import com.google.gson.JsonObject;
16 
import com.google.gson.JsonSyntaxException;
17 
import com.google.gson.TypeAdapter;
18 
import com.google.gson.stream.JsonReader;
19 
import com.google.gson.stream.JsonWriter;
20
21 
import com.reallifedeveloper.common.application.notification.Notification;
22 
import com.reallifedeveloper.common.domain.ErrorHandling;
23 
import com.reallifedeveloper.common.domain.ObjectSerializer;
24 
import com.reallifedeveloper.common.domain.event.DomainEvent;
25
26 
/**
27 
 * An implementation of the {@link ObjectSerializer} that uses JSON as the serialized form.
28 
 *
29 
 * @author RealLifeDeveloper
30 
 */
31 
public class GsonObjectSerializer implements ObjectSerializer<String> {
32
33 
    /**
34 
     * The format used to parse and format date objects. The string is a pattern that can be used by a {@code java.time.DateTimeFormatter}.
35 
     */
36 
    public static final String DATE_FORMAT = "yyyy-MM-dd";
37
38 
    /**
39 
     * The format used to parse and format {@code java.time.LocalDateTime} objects. The string is a pattern that can be used by a
40 
     * {@code DateTimeFormatter}.
41 
     */
42 
    public static final String LOCAL_DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS";
43
44 
    /**
45 
     * The format used to parse and format {@code java.time.ZonedDateTime} objects. The string is a pattern that can be used by a
46 
     * {@code DateTimeFormatter}.
47 
     */
48 
    public static final String DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSX";
49
50 
    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern(DATE_FORMAT);
51 
    private static final DateTimeFormatter LOCAL_DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern(LOCAL_DATE_TIME_FORMAT);
52 
    private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern(DATE_TIME_FORMAT);
53
54 
    private final Gson gson;
55
56 
    /**
57 
     * Creates a new {@code GsonObjectSerializer} with default values.
58 
     * <p>
59 
     * The default values include using the pattern {@value #DATE_TIME_FORMAT} when working with {@code java.time.ZonedDateTime} objects.
60 
     */
61 
    public GsonObjectSerializer() {
62 
        gson = new GsonBuilder().setDateFormat(DATE_TIME_FORMAT).registerTypeAdapter(Notification.class, new NotificationDeserializer())
63 
                .registerTypeAdapter(LocalDate.class, new LocalDateAdapter().nullSafe())
64 
                .registerTypeAdapter(LocalDateTime.class, new LocalDateTmeAdapter().nullSafe())
65 
                .registerTypeAdapter(ZonedDateTime.class, new ZonedDateTmeAdapter().nullSafe()).create();
66 
    }
67
68 
    @Override
69 
    public String serialize(Object object) {
70 1 1. serialize : replaced return value with "" for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer::serialize → KILLED
 
        return gson.toJson(object);
71 
    }
72
73 
    @Override
74 
    public <U> U deserialize(String serializedObject, Class<U> objectType) {
75 2 1. deserialize : negated conditional → KILLED
2. deserialize : negated conditional → KILLED
 
        if (serializedObject == null || objectType == null) {
76 
            throw new IllegalArgumentException(
77 
                    "Arguments must not be null: serializedObject=" + serializedObject + ", objectType=" + objectType);
78 
        }
79 
        try {
80 1 1. deserialize : replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer::deserialize → KILLED
 
            return gson.fromJson(serializedObject, objectType);
81 
        } catch (JsonSyntaxException e) {
82 
            throw new IllegalArgumentException("serializedObject cannot be parsed as JSON: " + serializedObject, e);
83 
        }
84 
    }
85
86 
    private static final class NotificationDeserializer implements JsonDeserializer<Notification> {
87 
        @Override
88 
        public Notification deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
89 1 1. deserialize : negated conditional → KILLED
 
            if (!Notification.class.getTypeName().equals(typeOfT.getTypeName())) {
90 
                throw new IllegalStateException("Unexpected type in deserialize method, expected 'Notification'. typeOfT=" + typeOfT);
91 
            }
92 
            try {
93 
                JsonObject jsonObject = json.getAsJsonObject();
94 
                String eventType = jsonObject.get("eventType").getAsString();
95 
                long storedEventId = jsonObject.get("storedEventId").getAsLong();
96 
                ZonedDateTime occurredOn = context.deserialize(jsonObject.get("occurredOn"), ZonedDateTime.class);
97 
                @SuppressWarnings("unchecked")
98 
                Class<DomainEvent> eventClass = (Class<DomainEvent>) Class.forName(eventType);
99 
                DomainEvent event = context.deserialize(jsonObject.get("event"), eventClass);
100 1 1. deserialize : removed call to com/reallifedeveloper/common/domain/ErrorHandling::checkNull → KILLED
 
                ErrorHandling.checkNull("JSON notification is missing event: json=" + json, event);
101 1 1. deserialize : replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$NotificationDeserializer::deserialize → KILLED
 
                return new Notification(eventType, storedEventId, occurredOn, event);
102 
            } catch (ClassNotFoundException e) {
103 
                throw new IllegalStateException("Internal error: " + e.toString(), e);
104 
            }
105 
        }
106 
    }
107
108 
    private static final class LocalDateAdapter extends TypeAdapter<LocalDate> {
109 
        @Override
110 
        public void write(final JsonWriter jsonWriter, final LocalDate localDate) throws IOException {
111 
            jsonWriter.value(localDate.format(DATE_FORMATTER));
112 
        }
113
114 
        @Override
115 
        public LocalDate read(final JsonReader jsonReader) throws IOException {
116 1 1. read : replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$LocalDateAdapter::read → KILLED
 
            return LocalDate.parse(jsonReader.nextString(), DATE_FORMATTER);
117 
        }
118 
    }
119
120 
    private static final class LocalDateTmeAdapter extends TypeAdapter<LocalDateTime> {
121 
        @Override
122 
        public void write(final JsonWriter jsonWriter, final LocalDateTime localDateTime) throws IOException {
123 
            jsonWriter.value(localDateTime.format(LOCAL_DATE_TIME_FORMATTER));
124 
        }
125
126 
        @Override
127 
        public LocalDateTime read(final JsonReader jsonReader) throws IOException {
128 1 1. read : replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$LocalDateTmeAdapter::read → KILLED
 
            return LocalDateTime.parse(jsonReader.nextString(), LOCAL_DATE_TIME_FORMATTER);
129 
        }
130 
    }
131
132 
    private static final class ZonedDateTmeAdapter extends TypeAdapter<ZonedDateTime> {
133 
        @Override
134 
        public void write(final JsonWriter jsonWriter, final ZonedDateTime zonedDateTime) throws IOException {
135 
            jsonWriter.value(zonedDateTime.format(DATE_TIME_FORMATTER));
136 
        }
137
138 
        @Override
139 
        public ZonedDateTime read(final JsonReader jsonReader) throws IOException {
140 1 1. read : replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$ZonedDateTmeAdapter::read → KILLED
 
            return ZonedDateTime.parse(jsonReader.nextString(), DATE_TIME_FORMATTER);
141 
        }
142 
    }
143 
}

Mutations

70

1.1
Location : serialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:serializeNull()] replaced return value with "" for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer::serialize → KILLED

75

1.1
Location : deserialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:deserializeTheStringNull()] negated conditional → KILLED

2.2
Location : deserialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:deserializeTheStringNull()] negated conditional → KILLED

80

1.1
Location : deserialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:serializeAndDeserializeEvent()] replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer::deserialize → KILLED

89

1.1
Location : deserialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:deserializeNotificationWithEmptyEvent()] negated conditional → KILLED

100

1.1
Location : deserialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:deserializeNotificationWithEmptyEvent()] removed call to com/reallifedeveloper/common/domain/ErrorHandling::checkNull → KILLED

101

1.1
Location : deserialize
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:serializeAndDeserializeNotification()] replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$NotificationDeserializer::deserialize → KILLED

116

1.1
Location : read
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:serializeAndDeserializeLocalDate()] replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$LocalDateAdapter::read → KILLED

128

1.1
Location : read
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:serializeAndDeserializeLocalDateTime()] replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$LocalDateTmeAdapter::read → KILLED

140

1.1
Location : read
Killed by : com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest.[engine:junit-jupiter]/[class:com.reallifedeveloper.common.infrastructure.GsonObjectSerializerTest]/[method:serializeAndDeserializeEvent()] replaced return value with null for com/reallifedeveloper/common/infrastructure/GsonObjectSerializer$ZonedDateTmeAdapter::read → KILLED

Active mutators

Tests examined


Report generated by PIT 1.20.2