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[BAEL-13506] - Split or move core-java-8 module (#7790)

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This commit is contained in:
Amit Pandey
2019-09-20 19:00:34 +05:30
committed by Josh Cummings
parent 7d65b1fb24
commit f2cac1ab7c
124 changed files with 640 additions and 51 deletions
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11
core-java-modules/core-java-annotations/README.md Normal file
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=========
## Core Java 8 Cookbooks and Examples
### Relevant Articles:
- [Java @Override Annotation](https://www.baeldung.com/java-override)
- [Java @SuppressWarnings Annotation](https://www.baeldung.com/java-suppresswarnings)
- [Java @SafeVarargs Annotation](https://www.baeldung.com/java-safevarargs)
- [Java @Deprecated Annotation](https://www.baeldung.com/java-deprecated)
- [Overview of Java Built-in Annotations](https://www.baeldung.com/java-default-annotations)
- [Creating a Custom Annotation in Java](https://www.baeldung.com/java-custom-annotation)

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core-java-modules/core-java-annotations/pom.xml Normal file
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-annotations</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-annotations</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-generator.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-bytecode</artifactId>
<version>${jmh-generator.version}</version>
</dependency>
</dependencies>
<build>
<finalName>core-java-annotations</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<properties>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<asspectj.version>1.8.9</asspectj.version>
<jmh-core.version>1.19</jmh-core.version>
<jmh-generator.version>1.19</jmh-generator.version>
<!-- plugins -->
<maven-surefire-plugin.version>2.22.1</maven-surefire-plugin.version>
</properties>
</project>

5
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/ClassWithAnnotation.java Normal file
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package com.baeldung.annotations;
@Deprecated
class ClassWithAnnotation {
}

9
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/ClassWithDeprecatedMethod.java Normal file
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package com.baeldung.annotations;
class ClassWithDeprecatedMethod {
@Deprecated
static void deprecatedMethod() {
}
}

11
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/ClassWithSafeVarargs.java Normal file
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package com.baeldung.annotations;
class ClassWithSafeVarargs<T> {
@SafeVarargs
final void iterateOverVarargs(T... args) {
for (T x : args) {
// do stuff with x
}
}
}

9
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/ClassWithSuppressWarnings.java Normal file
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package com.baeldung.annotations;
class ClassWithSuppressWarnings {
@SuppressWarnings("deprecation")
void useDeprecatedMethod() {
ClassWithDeprecatedMethod.deprecatedMethod(); // no warning is generated here
}
}

8
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/IntConsumer.java Normal file
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package com.baeldung.annotations;
@FunctionalInterface
interface IntConsumer {
void accept(Integer number);
}

8
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/Interval.java Normal file
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package com.baeldung.annotations;
import java.lang.annotation.Repeatable;
@Repeatable(Intervals.class)
@interface Interval {
int hour() default 1;
}

9
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/IntervalUsage.java Normal file
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package com.baeldung.annotations;
public class IntervalUsage {
@Interval(hour = 17)
@Interval(hour = 13)
void doPeriodicCleanup() {
}
}

5
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/Intervals.java Normal file
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package com.baeldung.annotations;
@interface Intervals {
Interval[] value();
}

11
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/MyAnnotation.java Normal file
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package com.baeldung.annotations;
import java.lang.annotation.*;
@Inherited
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.LOCAL_VARIABLE, ElementType.FIELD})
@interface MyAnnotation {
}

16
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/MyAnnotationTarget.java Normal file
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package com.baeldung.annotations;
class MyAnnotationTarget {
// this is OK
@MyAnnotation
String someField;
// @MyAnnotation <- this is invalid usage!
void doSomething() {
// this also works
@MyAnnotation
String localVariable;
}
}

6
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/MyOperation.java Normal file
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package com.baeldung.annotations;
interface MyOperation {
void perform();
}

9
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/MyOperationImpl.java Normal file
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package com.baeldung.annotations;
class MyOperationImpl implements MyOperation {
@Override
public void perform() {
}
}

13
core-java-modules/core-java-annotations/src/main/java/com/baeldung/customannotations/Init.java Normal file
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package com.baeldung.customannotations;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target(METHOD)
public @interface Init {
}

13
core-java-modules/core-java-annotations/src/main/java/com/baeldung/customannotations/JsonElement.java Normal file
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package com.baeldung.customannotations;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target({ FIELD })
public @interface JsonElement {
public String key() default "";
}

13
core-java-modules/core-java-annotations/src/main/java/com/baeldung/customannotations/JsonSerializable.java Normal file
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package com.baeldung.customannotations;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target(TYPE)
public @interface JsonSerializable {
}

10
core-java-modules/core-java-annotations/src/main/java/com/baeldung/customannotations/JsonSerializationException.java Normal file
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package com.baeldung.customannotations;
public class JsonSerializationException extends RuntimeException {
private static final long serialVersionUID = 1L;
public JsonSerializationException(String message) {
super(message);
}
}

67
core-java-modules/core-java-annotations/src/main/java/com/baeldung/customannotations/ObjectToJsonConverter.java Normal file
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package com.baeldung.customannotations;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
public class ObjectToJsonConverter {
public String convertToJson(Object object) throws JsonSerializationException {
try {
checkIfSerializable(object);
initializeObject(object);
return getJsonString(object);
} catch (Exception e) {
throw new JsonSerializationException(e.getMessage());
}
}
private void checkIfSerializable(Object object) {
if (Objects.isNull(object)) {
throw new JsonSerializationException("Can't serialize a null object");
}
Class<?> clazz = object.getClass();
if (!clazz.isAnnotationPresent(JsonSerializable.class)) {
throw new JsonSerializationException("The class " + clazz.getSimpleName() + " is not annotated with JsonSerializable");
}
}
private void initializeObject(Object object) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
Class<?> clazz = object.getClass();
for (Method method : clazz.getDeclaredMethods()) {
if (method.isAnnotationPresent(Init.class)) {
method.setAccessible(true);
method.invoke(object);
}
}
}
private String getJsonString(Object object) throws IllegalArgumentException, IllegalAccessException {
Class<?> clazz = object.getClass();
Map<String, String> jsonElementsMap = new HashMap<>();
for (Field field : clazz.getDeclaredFields()) {
field.setAccessible(true);
if (field.isAnnotationPresent(JsonElement.class)) {
jsonElementsMap.put(getKey(field), (String) field.get(object));
}
}
String jsonString = jsonElementsMap.entrySet()
.stream()
.map(entry -> "\"" + entry.getKey() + "\":\"" + entry.getValue() + "\"")
.collect(Collectors.joining(","));
return "{" + jsonString + "}";
}
private String getKey(Field field) {
String value = field.getAnnotation(JsonElement.class)
.key();
return value.isEmpty() ? field.getName() : value;
}
}

66
core-java-modules/core-java-annotations/src/main/java/com/baeldung/customannotations/Person.java Normal file
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package com.baeldung.customannotations;
@JsonSerializable
public class Person {
@JsonElement
private String firstName;
@JsonElement
private String lastName;
@JsonElement(key = "personAge")
private String age;
private String address;
public Person(String firstName, String lastName) {
super();
this.firstName = firstName;
this.lastName = lastName;
}
public Person(String firstName, String lastName, String age) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
@Init
private void initNames() {
this.firstName = this.firstName.substring(0, 1)
.toUpperCase() + this.firstName.substring(1);
this.lastName = this.lastName.substring(0, 1)
.toUpperCase() + this.lastName.substring(1);
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}

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core-java-modules/core-java-annotations/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

26
core-java-modules/core-java-annotations/src/test/java/com/baeldung/customannotations/JsonSerializerUnitTest.java Normal file
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package com.baeldung.customannotations;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.Test;
public class JsonSerializerUnitTest {
@Test
public void givenObjectNotSerializedThenExceptionThrown() throws JsonSerializationException {
Object object = new Object();
ObjectToJsonConverter serializer = new ObjectToJsonConverter();
assertThrows(JsonSerializationException.class, () -> {
serializer.convertToJson(object);
});
}
@Test
public void givenObjectSerializedThenTrueReturned() throws JsonSerializationException {
Person person = new Person("soufiane", "cheouati", "34");
ObjectToJsonConverter serializer = new ObjectToJsonConverter();
String jsonString = serializer.convertToJson(person);
assertEquals("{\"personAge\":\"34\",\"firstName\":\"Soufiane\",\"lastName\":\"Cheouati\"}", jsonString);
}
}

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core-java-modules/core-java-annotations/src/test/resources/.gitignore vendored Normal file
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear